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Class Index

These are the API classes. See all API packages.

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A

AbsSavedState A Parcelable implementation that should be used by inheritance hierarchies to ensure the state of all classes along the chain is saved. 
AbstractDetailsDescriptionPresenter An abstract Presenter for rendering a detailed description of an item. 
AbstractDetailsDescriptionPresenter.ViewHolder The ViewHolder for the AbstractDetailsDescriptionPresenter
AbstractMediaItemPresenter Abstract Presenter class for rendering media items in a playlist format. 
AbstractMediaItemPresenter.ViewHolder The ViewHolder for the AbstractMediaItemPresenter
AbstractMediaListHeaderPresenter Abstract presenter class for rendering the header for a list of media items in a playlist. 
AbstractMediaListHeaderPresenter.ViewHolder The ViewHolder for the AbstractMediaListHeaderPresenter
AccessibilityDelegateCompat Helper for accessing View.AccessibilityDelegate
AccessibilityEventCompat Helper for accessing features in AccessibilityEvent
AccessibilityManagerCompat Helper for accessing features in AccessibilityManager
AccessibilityManagerCompat.AccessibilityStateChangeListener This interface was deprecated in API level 26.1.0. Use AccessibilityManager.AccessibilityStateChangeListener directly instead of this listener.  
AccessibilityManagerCompat.AccessibilityStateChangeListenerCompat This class was deprecated in API level 25.1.0. Use AccessibilityManager.AccessibilityStateChangeListener directly instead of this listener.  
AccessibilityManagerCompat.TouchExplorationStateChangeListener Listener for the system touch exploration state. 
AccessibilityNodeInfoCompat Helper for accessing AccessibilityNodeInfo in a backwards compatible fashion. 
AccessibilityNodeInfoCompat.AccessibilityActionCompat  
AccessibilityNodeInfoCompat.CollectionInfoCompat Class with information if a node is a collection. 
AccessibilityNodeInfoCompat.CollectionItemInfoCompat Class with information if a node is a collection item. 
AccessibilityNodeInfoCompat.RangeInfoCompat Class with information if a node is a range. 
AccessibilityNodeProviderCompat Helper for accessing AccessibilityNodeProvider
AccessibilityRecordCompat Helper for accessing AccessibilityRecord
AccessibilityServiceInfoCompat Helper for accessing features in AccessibilityServiceInfo
AccessibilityWindowInfoCompat Helper for accessing AccessibilityWindowInfo
Action An action contains one or two lines of text, an optional image and an optional id. 
ActionBar A primary toolbar within the activity that may display the activity title, application-level navigation affordances, and other interactive items. 
ActionBar.LayoutParams Per-child layout information associated with action bar custom views. 
ActionBar.OnMenuVisibilityListener Listener for receiving events when action bar menus are shown or hidden. 
ActionBar.OnNavigationListener This interface was deprecated in API level 24.1.0. Action bar navigation modes are deprecated and not supported by inline toolbar action bars. Consider using other common navigation patterns instead.  
ActionBar.Tab This class was deprecated in API level 24.1.0. Action bar navigation modes are deprecated and not supported by inline toolbar action bars. Consider using other common navigation patterns instead.  
ActionBar.TabListener This interface was deprecated in API level 24.1.0. Action bar navigation modes are deprecated and not supported by inline toolbar action bars. Consider using other common navigation patterns instead.  
ActionBarDrawerToggle This class provides a handy way to tie together the functionality of DrawerLayout and the framework ActionBar to implement the recommended design for navigation drawers. 
ActionBarDrawerToggle This class provides a handy way to tie together the functionality of DrawerLayout and the framework ActionBar to implement the recommended design for navigation drawers. 
ActionBarDrawerToggle.Delegate This interface was deprecated in API level 25.4.0. Use ActionBarDrawerToggle.DelegateProvider in support-v7-appcompat.  
ActionBarDrawerToggle.Delegate  
ActionBarDrawerToggle.DelegateProvider This interface was deprecated in API level 25.4.0. Use ActionBarDrawerToggle.DelegateProvider in support-v7-appcompat.  
ActionBarDrawerToggle.DelegateProvider Allows an implementing Activity to return an ActionBarDrawerToggle.Delegate to use with ActionBarDrawerToggle. 
ActionMenuView ActionMenuView is a presentation of a series of menu options as a View. 
ActionMenuView.LayoutParams  
ActionMenuView.OnMenuItemClickListener Interface responsible for receiving menu item click events if the items themselves do not have individual item click listeners. 
ActionMode Represents a contextual mode of the user interface. 
ActionMode.Callback Callback interface for action modes. 
ActionProvider This class is a mediator for accomplishing a given task, for example sharing a file. 
ActionProvider.VisibilityListener Listens to changes in visibility as reported by refreshVisibility()
ActivityCompat Helper for accessing features in Activity in a backwards compatible fashion. 
ActivityCompat Helper for accessing features in Activity
ActivityCompat.OnRequestPermissionsResultCallback This interface is the contract for receiving the results for permission requests. 
ActivityCompat.PermissionCompatDelegate Customizable delegate that allows delegating permission compatibility methods to a custom implementation. 
ActivityInfoCompat This class was deprecated in API level 27.0.0. Use ActivityInfo directly.  
ActivityManagerCompat Helper for accessing features in ActivityManager in a backwards compatible fashion. 
ActivityOptionsCompat Helper for accessing features in ActivityOptions in a backwards compatible fashion. 
AlarmManagerCompat Compatibility library for AlarmManager with fallbacks for older platforms. 
AlertDialog A subclass of Dialog that can display one, two or three buttons. 
AlertDialog.Builder  
AmbientMode Use this as a headless Fragment to add ambient support to an Activity on Wearable devices. 
AmbientMode.AmbientCallback Callback to receive ambient mode state changes. 
AmbientMode.AmbientCallbackProvider Interface for any Activity that wishes to implement Ambient Mode. 
AmbientMode.AmbientController A class for interacting with the ambient mode on a wearable device. 
Animatable2Compat Interface that drawables supporting animations and callbacks should extend in support lib. 
Animatable2Compat.AnimationCallback Abstract class for animation callback. 
AnimatedVectorDrawableCompat For API 24 and above, this class is delegating to the framework's AnimatedVectorDrawable
AnimatorRes Denotes that an integer parameter, field or method return value is expected to be an animator resource reference (e.g. 
AnimRes Denotes that an integer parameter, field or method return value is expected to be an anim resource reference (e.g. 
AnyRes Denotes that an integer parameter, field or method return value is expected to be a resource reference of any type. 
AnyThread Denotes that the annotated method can be called from any thread (e.g. 
AppBarLayout AppBarLayout is a vertical LinearLayout which implements many of the features of material designs app bar concept, namely scrolling gestures. 
AppBarLayout.Behavior The default AppBarLayout.Behavior for AppBarLayout
AppBarLayout.Behavior.DragCallback Callback to allow control over any AppBarLayout dragging. 
AppBarLayout.Behavior.SavedState  
AppBarLayout.LayoutParams  
AppBarLayout.OnOffsetChangedListener Interface definition for a callback to be invoked when an AppBarLayout's vertical offset changes. 
AppBarLayout.ScrollingViewBehavior Behavior which should be used by Views which can scroll vertically and support nested scrolling to automatically scroll any AppBarLayout siblings. 
AppCompatActivity Base class for activities that use the support library action bar features. 
AppCompatAutoCompleteTextView A AutoCompleteTextView which supports compatible features on older versions of the platform, including:
  • Allows dynamic tint of its background via the background tint methods in ViewCompat
AppCompatButton A Button which supports compatible features on older versions of the platform, including:
  • Allows dynamic tint of its background via the background tint methods in ViewCompat
AppCompatCallback Implemented this in order for AppCompat to be able to callback in certain situations. 
AppCompatCheckBox A CheckBox which supports compatible features on older versions of the platform, including:
AppCompatCheckedTextView A CheckedTextView which supports compatible features on older versions of the platform. 
AppCompatDelegate This class represents a delegate which you can use to extend AppCompat's support to any Activity
AppCompatDialog Base class for AppCompat themed Dialogs. 
AppCompatDialogFragment A special version of DialogFragment which uses an AppCompatDialog in place of a platform-styled dialog. 
AppCompatEditText A EditText which supports compatible features on older versions of the platform, including:
  • Allows dynamic tint of its background via the background tint methods in ViewCompat
AppCompatImageButton A ImageButton which supports compatible features on older versions of the platform, including:
  • Allows dynamic tint of its background via the background tint methods in ViewCompat
AppCompatImageView A ImageView which supports compatible features on older versions of the platform, including:
  • Allows dynamic tint of its background via the background tint methods in ViewCompat
AppCompatMultiAutoCompleteTextView A MultiAutoCompleteTextView which supports compatible features on older version of the platform, including:
AppCompatRadioButton A RadioButton which supports compatible features on older versions of the platform, including:
AppCompatRatingBar A RatingBar which supports compatible features on older versions of the platform. 
AppCompatResources Class for accessing an application's resources through AppCompat, and thus any backward compatible functionality. 
AppCompatSeekBar A SeekBar which supports compatible features on older versions of the platform. 
AppCompatSpinner A Spinner which supports compatible features on older versions of the platform, including:
AppCompatTextView A TextView which supports compatible features on older versions of the platform, including:
  • Allows dynamic tint of its background via the background tint methods in ViewCompat
AppLaunchChecker This class provides APIs for determining how an app has been launched. 
AppOpsManagerCompat Helper for accessing features in AppOpsManager
ArcMotion A PathMotion that generates a curved path along an arc on an imaginary circle containing the two points. 
ArrayMap<K, V> ArrayMap is a generic key->value mapping data structure that is designed to be more memory efficient than a traditional HashMap, this implementation is a version of the platform's ArrayMap that can be used on older versions of the platform. 
ArrayObjectAdapter An ObjectAdapter implemented with an ArrayList
ArrayRes Denotes that an integer parameter, field or method return value is expected to be an array resource reference (e.g. 
ArraySet<E> ArraySet is a generic set data structure that is designed to be more memory efficient than a traditional HashSet
AsyncLayoutInflater

Helper class for inflating layouts asynchronously. 

AsyncLayoutInflater.OnInflateFinishedListener  
AsyncListUtil<T> A utility class that supports asynchronous content loading. 
AsyncListUtil.DataCallback<T> The callback that provides data access for AsyncListUtil
AsyncListUtil.ViewCallback The callback that links AsyncListUtil with the list view. 
AsyncTaskLoader<D> Static library support version of the framework's AsyncTaskLoader
AtomicFile Static library support version of the framework's AtomicFile, a helper class for performing atomic operations on a file by creating a backup file until a write has successfully completed. 
AttrRes Denotes that an integer parameter, field or method return value is expected to be an attribute reference (e.g. 
AudioAttributesCompat A class to encapsulate a collection of attributes describing information about an audio stream. 
AudioAttributesCompat.Builder Builder class for AudioAttributesCompat objects. 
AutoScrollHelper AutoScrollHelper is a utility class for adding automatic edge-triggered scrolling to Views. 
AutoTransition Utility class for creating a default transition that automatically fades, moves, and resizes views during a scene change. 

B

BackgroundManager Supports background image continuity between multiple Activities. 
BaseCardView A card style layout that responds to certain state changes. 
BaseCardView.LayoutParams Per-child layout information associated with BaseCardView. 
BaseFragment Base class for leanback Fragments. 
BaseGridView An abstract base class for vertically and horizontally scrolling lists. 
BaseGridView.OnKeyInterceptListener Listener for intercepting key dispatch events. 
BaseGridView.OnMotionInterceptListener Listener for intercepting generic motion dispatch events. 
BaseGridView.OnTouchInterceptListener Listener for intercepting touch dispatch events. 
BaseGridView.OnUnhandledKeyListener  
BaseLeanbackPreferenceFragment This fragment provides a preference fragment with leanback-style behavior, suitable for embedding into broader UI elements. 
BaseOnItemViewClickedListener<T> Interface for receiving notification when an item view holder is clicked. 
BaseOnItemViewSelectedListener<T> Interface for receiving notification when a row or item becomes selected. 
BaseSupportFragment Base class for leanback Fragments. 
BaseTransientBottomBar<B extends BaseTransientBottomBar<B>> Base class for lightweight transient bars that are displayed along the bottom edge of the application window. 
BaseTransientBottomBar.BaseCallback<B> Base class for BaseTransientBottomBar callbacks. 
BaseTransientBottomBar.ContentViewCallback Interface that defines the behavior of the main content of a transient bottom bar. 
BatchingListUpdateCallback Wraps a ListUpdateCallback callback and batches operations that can be merged. 
BidiFormatter Utility class for formatting text for display in a potentially opposite-directionality context without garbling. 
BidiFormatter.Builder A class for building a BidiFormatter with non-default options. 
BinderThread Denotes that the annotated method should only be called on the binder thread. 
BitmapCompat Helper for accessing features in Bitmap
BoolRes Denotes that an integer parameter, field or method return value is expected to be a boolean resource reference. 
BottomNavigationView

Represents a standard bottom navigation bar for application. 

BottomNavigationView.OnNavigationItemReselectedListener Listener for handling reselection events on bottom navigation items. 
BottomNavigationView.OnNavigationItemSelectedListener Listener for handling selection events on bottom navigation items. 
BottomSheetBehavior<V extends View> An interaction behavior plugin for a child view of CoordinatorLayout to make it work as a bottom sheet. 
BottomSheetBehavior.BottomSheetCallback Callback for monitoring events about bottom sheets. 
BottomSheetBehavior.SavedState  
BottomSheetDialog Base class for Dialogs styled as a bottom sheet. 
BottomSheetDialogFragment Modal bottom sheet. 
BoundsRule This class contains the rules for updating the bounds of a CompositeDrawable.ChildDrawable
BoundsRule.ValueRule This class represents individual rules for updating the bounds. 
BoxInsetLayout BoxInsetLayout is a screen shape-aware ViewGroup that can box its children in the center square of a round screen by using the boxedEdges attribute. 
BoxInsetLayout.LayoutParams Per-child layout information for layouts that support margins, gravity and boxedEdges. 
BrandedFragment Fragment class for managing search and branding using a view that implements TitleViewAdapter.Provider
BrandedSupportFragment Fragment class for managing search and branding using a view that implements TitleViewAdapter.Provider
BrowseFragment A fragment for creating Leanback browse screens. 
BrowseFragment.BrowseTransitionListener Listener for transitions between browse headers and rows. 
BrowseFragment.FragmentFactory<T extends Fragment> Factory class responsible for creating fragment given the current item. 
BrowseFragment.FragmentHost Possible set of actions that BrowseFragment exposes to clients. 
BrowseFragment.ListRowFragmentFactory FragmentFactory implementation for ListRow
BrowseFragment.MainFragmentAdapter<T extends Fragment> Interface that defines the interaction between BrowseFragment and its main content fragment. 
BrowseFragment.MainFragmentAdapterProvider Interface to be implemented by all fragments for providing an instance of BrowseFragment.MainFragmentAdapter
BrowseFragment.MainFragmentAdapterRegistry Registry class maintaining the mapping of Row subclasses to BrowseFragment.FragmentFactory
BrowseFragment.MainFragmentRowsAdapter<T extends Fragment> This is used to pass information to RowsFragment or its subclasses. 
BrowseFragment.MainFragmentRowsAdapterProvider Interface to be implemented by RowsFragment and its subclasses for providing an instance of BrowseFragment.MainFragmentRowsAdapter
BrowseFrameLayout A ViewGroup for managing focus behavior between overlapping views. 
BrowseFrameLayout.OnChildFocusListener Interface for managing child focus in a BrowseFrameLayout. 
BrowseFrameLayout.OnFocusSearchListener Interface for selecting a focused view in a BrowseFrameLayout when the system focus finder couldn't find a view to focus. 
BrowseSupportFragment A fragment for creating Leanback browse screens. 
BrowseSupportFragment.BrowseTransitionListener Listener for transitions between browse headers and rows. 
BrowseSupportFragment.FragmentFactory<T extends Fragment> Factory class responsible for creating fragment given the current item. 
BrowseSupportFragment.FragmentHost Possible set of actions that BrowseSupportFragment exposes to clients. 
BrowseSupportFragment.ListRowFragmentFactory FragmentFactory implementation for ListRow
BrowseSupportFragment.MainFragmentAdapter<T extends Fragment> Interface that defines the interaction between BrowseSupportFragment and its main content fragment. 
BrowseSupportFragment.MainFragmentAdapterProvider Interface to be implemented by all fragments for providing an instance of BrowseSupportFragment.MainFragmentAdapter
BrowseSupportFragment.MainFragmentAdapterRegistry Registry class maintaining the mapping of Row subclasses to BrowseSupportFragment.FragmentFactory
BrowseSupportFragment.MainFragmentRowsAdapter<T extends Fragment> This is used to pass information to RowsSupportFragment or its subclasses. 
BrowseSupportFragment.MainFragmentRowsAdapterProvider Interface to be implemented by RowsSupportFragment and its subclasses for providing an instance of BrowseSupportFragment.MainFragmentRowsAdapter
BuildCompat This class contains additional platform version checking methods for targeting pre-release versions of Android. 
BundleCompat Helper for accessing features in Bundle
BundledEmojiCompatConfig EmojiCompat.Config implementation that loads the metadata using AssetManager and bundled resources. 

C

CallSuper Denotes that any overriding methods should invoke this method as well. 
CancellationSignal Static library support version of the framework's CancellationSignal
CancellationSignal.OnCancelListener Listens for cancellation. 
CardView A FrameLayout with a rounded corner background and shadow. 
ChangeBounds This transition captures the layout bounds of target views before and after the scene change and animates those changes during the transition. 
ChangeClipBounds ChangeClipBounds captures the getClipBounds() before and after the scene change and animates those changes during the transition. 
ChangeImageTransform This Transition captures an ImageView's matrix before and after the scene change and animates it during the transition. 
ChangeScroll This transition captures the scroll properties of targets before and after the scene change and animates any changes. 
ChangeTransform This Transition captures scale and rotation for Views before and after the scene change and animates those changes during the transition. 
Channel A convenience class to access TvContractCompat.Channels entries in the system content provider. 
Channel.Builder The builder class that makes it easy to chain setters to create a Channel object. 
ChannelLogoUtils A utility class for conveniently storing and loading channel logos. 
CheckBoxPreference A Preference that provides checkbox widget functionality. 
CheckResult Denotes that the annotated method returns a result that it typically is an error to ignore. 
CircularArray<E> CircularArray is a generic circular array data structure that provides O(1) random read, O(1) prepend and O(1) append. 
CircularIntArray CircularIntArray is a circular integer array data structure that provides O(1) random read, O(1) prepend and O(1) append. 
CircularProgressDrawable Drawable that renders the animated indeterminate progress indicator in the Material design style without depending on API level 11. 
CircularProgressLayout CircularProgressLayout adds a circular countdown timer behind the view it contains, typically used to automatically confirm an operation after a short delay has elapsed. 
CircularProgressLayout.OnTimerFinishedListener Interface to implement for listening to onTimerFinished(CircularProgressLayout) event. 
CircularPropagation A propagation that varies with the distance to the epicenter of the Transition or center of the scene if no epicenter exists. 
ClassPresenterSelector A ClassPresenterSelector selects a Presenter based on the item's Java class. 
CollapsibleActionView When a View implements this interface it will receive callbacks when expanded or collapsed as an action view alongside the optional, app-specified callbacks to MenuItemCompat.OnActionExpandListener
CollapsingToolbarLayout CollapsingToolbarLayout is a wrapper for Toolbar which implements a collapsing app bar. 
CollapsingToolbarLayout.LayoutParams  
ColorFilterCache Cache of ColorFilters for a given color at different alpha levels. 
ColorFilterDimmer Helper class for applying a dim level to a View. 
ColorInt Denotes that the annotated element represents a packed color int, AARRGGBB
ColorLong

Denotes that the annotated element represents a packed color long. 

ColorOverlayDimmer Helper class for assigning a dim color to Paint. 
ColorRes Denotes that an integer parameter, field or method return value is expected to be a color resource reference (e.g. 
ColorUtils A set of color-related utility methods, building upon those available in Color
CompositeDrawable Generic drawable class that can be composed of multiple children. 
CompositeDrawable.ChildDrawable Wrapper class holding a drawable object and BoundsRule to update drawable bounds when parent bound changes. 
CompoundButtonCompat Helper for accessing CompoundButton
ConfigurationCompat Helper class which allows access to properties of Configuration in a backward compatible fashion. 
ConfigurationHelper Helper class which allows access to properties of Configuration in a backward compatible fashion. 
ConnectivityManagerCompat Helper for accessing features in ConnectivityManager
ContentLoadingProgressBar ContentLoadingProgressBar implements a ProgressBar that waits a minimum time to be dismissed before showing. 
ContentPager ContentPager provides support for loading "paged" data on a background thread using the ContentResolver framework. 
ContentPager.ContentCallback Callback by which a client receives results of a query. 
ContentPager.CursorDisposition  
ContentPager.QueryRunner Implementations of this interface provide the mechanism for execution of queries off the UI thread. 
ContentPager.QueryRunner.Callback Callback that receives a cursor once a query as been executed on the Runner. 
ContentRecommendation The ContentRecommendation object encapsulates all application provided data for a single content recommendation item. 
ContentRecommendation.Builder Builder class for ContentRecommendation objects. 
ContentRecommendation.ContentMaturity  
ContentRecommendation.ContentPricing  
ContentRecommendation.ContentStatus  
ContentRecommendation.ContentType  
ContentRecommendation.IntentData Object used to encapsulate the data to be used to build the PendingIntent object associated with a given content recommendation, at the time this recommendation gets posted to the home Screen. 
ContentRecommendation.IntentType  
ContentResolverCompat Helper for accessing features in ContentResolver in a backwards compatible fashion. 
ContextCompat Helper for accessing features in Context
ControlButtonPresenterSelector Displays primary and secondary controls for a PlaybackControlsRow
CoordinatorLayout CoordinatorLayout is a super-powered FrameLayout
CoordinatorLayout.Behavior<V extends View> Interaction behavior plugin for child views of CoordinatorLayout
CoordinatorLayout.DefaultBehavior Defines the default CoordinatorLayout.Behavior of a View class. 
CoordinatorLayout.LayoutParams Parameters describing the desired layout for a child of a CoordinatorLayout
CoordinatorLayout.SavedState  
CursorAdapter Static library support version of the framework's CursorAdapter
CursorLoader Static library support version of the framework's CursorLoader
CursorMapper Abstract class used to convert the current Cursor row to a single object. 
CursorObjectAdapter An ObjectAdapter implemented with a Cursor
CurvingLayoutCallback An implementation of the WearableLinearLayoutManager.LayoutCallback aligning the children of the associated WearableRecyclerView along a pre-defined vertical curve. 
CustomTabsCallback A callback class for custom tabs client to get messages regarding events in their custom tabs. 
CustomTabsClient Class to communicate with a CustomTabsService and create CustomTabsSession from it. 
CustomTabsIntent Class holding the Intent and start bundle for a Custom Tabs Activity. 
CustomTabsIntent.Builder Builder class for CustomTabsIntent objects. 
CustomTabsService Abstract service class for implementing Custom Tabs related functionality. 
CustomTabsService.Relation  
CustomTabsService.Result  
CustomTabsServiceConnection Abstract ServiceConnection to use while binding to a CustomTabsService
CustomTabsSession A class to be used for Custom Tabs related communication. 
CustomTabsSessionToken Wrapper class that can be used as a unique identifier for a session. 

D

DatabaseUtilsCompat This class was deprecated in API level 27.0.0. Use DatabaseUtils directly.  
DefaultItemAnimator This implementation of RecyclerView.ItemAnimator provides basic animations on remove, add, and move events that happen to the items in a RecyclerView. 
DetailsFragment A fragment for creating Leanback details screens. 
DetailsFragmentBackgroundController Controller for DetailsFragment parallax background and embedded video play. 
DetailsOverviewLogoPresenter Presenter that responsible to create a ImageView and bind to DetailsOverviewRow. 
DetailsOverviewLogoPresenter.ViewHolder ViewHolder for Logo view of DetailsOverviewRow. 
DetailsOverviewRow An overview Row for a details fragment. 
DetailsOverviewRow.Listener Listener for changes of DetailsOverviewRow. 
DetailsOverviewRowPresenter This class was deprecated in API level 24.1.0. Use FullWidthDetailsOverviewRowPresenter  
DetailsOverviewRowPresenter.ViewHolder A ViewHolder for the DetailsOverviewRow. 
DetailsParallax Subclass of Parallax object that tracks overview row's top and bottom edge in DetailsFragment or DetailsSupportFragment. 
DetailsSupportFragment A fragment for creating Leanback details screens. 
DetailsSupportFragmentBackgroundController Controller for DetailsSupportFragment parallax background and embedded video play. 
DialogFragment Static library support version of the framework's DialogFragment
DialogPreference A base class for Preference objects that are dialog-based. 
DialogPreference.TargetFragment  
DiffCallback<Value> Callback that informs ArrayObjectAdapter how to compute list updates when using DiffUtil in setItems(List, DiffCallback) method. 
DiffUtil DiffUtil is a utility class that can calculate the difference between two lists and output a list of update operations that converts the first list into the second one. 
DiffUtil.Callback A Callback class used by DiffUtil while calculating the diff between two lists. 
DiffUtil.DiffResult This class holds the information about the result of a calculateDiff(Callback, boolean) call. 
DimenRes Denotes that an integer parameter, field or method return value is expected to be a dimension resource reference (e.g. 
Dimension Denotes that an integer parameter, field or method return value is expected to represent a dimension. 
DisplayManagerCompat Helper for accessing features in DisplayManager
DividerItemDecoration DividerItemDecoration is a RecyclerView.ItemDecoration that can be used as a divider between items of a LinearLayoutManager
DividerPresenter DividerPresenter provides a default presentation for DividerRow in HeadersFragment. 
DividerRow Used to represent divider in HeadersFragment. 
DocumentFile Representation of a document backed by either a DocumentsProvider or a raw file on disk. 
DragAndDropPermissionsCompat Helper for accessing features in DragAndDropPermissions introduced after API level 13 in a backwards compatible fashion. 
DragStartHelper DragStartHelper is a utility class for implementing drag and drop support. 
DragStartHelper.OnDragStartListener Interface definition for a callback to be invoked when a drag start gesture is detected. 
DrawableCompat Helper for accessing features in Drawable
DrawableRes Denotes that an integer parameter, field or method return value is expected to be a drawable resource reference (e.g. 
DrawerArrowDrawable A drawable that can draw a "Drawer hamburger" menu or an arrow and animate between them. 
DrawerLayout DrawerLayout acts as a top-level container for window content that allows for interactive "drawer" views to be pulled out from one or both vertical edges of the window. 
DrawerLayout.DrawerListener Listener for monitoring events about drawers. 
DrawerLayout.LayoutParams  
DrawerLayout.SavedState State persisted across instances  
DrawerLayout.SimpleDrawerListener Stub/no-op implementations of all methods of DrawerLayout.DrawerListener
DropDownPreference A version of ListPreference that presents the options in a drop down menu rather than a dialog. 
DynamicAnimation<T extends DynamicAnimation<T>> This class is the base class of physics-based animations. 
DynamicAnimation.OnAnimationEndListener An animation listener that receives end notifications from an animation. 
DynamicAnimation.OnAnimationUpdateListener Implementors of this interface can add themselves as update listeners to an DynamicAnimation instance to receive callbacks on every animation frame, after the current frame's values have been calculated for that DynamicAnimation
DynamicAnimation.ViewProperty ViewProperty holds the access of a property of a View

E

EdgeEffectCompat Helper for accessing EdgeEffect
EditorInfoCompat Helper for accessing features in EditorInfo introduced after API level 13 in a backwards compatible fashion. 
EditTextPreference A Preference that allows for string input. 
EditTextPreferenceDialogFragment  
EditTextPreferenceDialogFragmentCompat  
EmojiAppCompatButton AppCompatButton widget enhanced with emoji capability by using EmojiTextViewHelper
EmojiAppCompatEditText AppCompatEditText widget enhanced with emoji capability by using EmojiEditTextHelper
EmojiAppCompatTextView AppCompatTextView widget enhanced with emoji capability by using EmojiTextViewHelper
EmojiButton Button widget enhanced with emoji capability by using EmojiTextViewHelper
EmojiCompat Main class to keep Android devices up to date with the newest emojis by adding EmojiSpans to a given CharSequence
EmojiCompat.Config Configuration class for EmojiCompat. 
EmojiCompat.InitCallback Listener class for the initialization of the EmojiCompat. 
EmojiCompat.MetadataRepoLoader Interface to load emoji metadata. 
EmojiCompat.MetadataRepoLoaderCallback Callback to inform EmojiCompat about the state of the metadata load. 
EmojiEditText EditText widget enhanced with emoji capability by using EmojiEditTextHelper
EmojiEditTextHelper Utility class to enhance custom EditText widgets with EmojiCompat
EmojiExtractTextLayout Layout that contains emoji compatibility enhanced ExtractEditText. 
EmojiSpan Base span class for the emoji replacement. 
EmojiTextView TextView widget enhanced with emoji capability by using EmojiTextViewHelper
EmojiTextViewHelper Utility class to enhance custom TextView widgets with EmojiCompat
EnvironmentCompat Helper for accessing features in Environment
ErrorFragment A fragment for displaying an error indication. 
ErrorSupportFragment A fragment for displaying an error indication. 
ExifInterface This is a class for reading and writing Exif tags in a JPEG file or a RAW image file. 
Explode This transition tracks changes to the visibility of target views in the start and end scenes and moves views in or out from the edges of the scene. 
ExploreByTouchHelper ExploreByTouchHelper is a utility class for implementing accessibility support in custom Views that represent a collection of View-like logical items. 

F

FacetProvider This is the query interface to supply optional features(aka facets) on an object without the need of letting the object to subclass or implement java interfaces. 
FacetProviderAdapter Optional interface that implemented by RecyclerView.Adapter to query FacetProvider for a given type within Adapter. 
Fade This transition tracks changes to the visibility of target views in the start and end scenes and fades views in or out when they become visible or non-visible. 
FastOutLinearInInterpolator Interpolator corresponding to fast_out_linear_in
FastOutSlowInInterpolator Interpolator corresponding to fast_out_slow_in
FileProvider FileProvider is a special subclass of ContentProvider that facilitates secure sharing of files associated with an app by creating a content:// Uri for a file instead of a file:/// Uri
FingerprintManagerCompat A class that coordinates access to the fingerprint hardware. 
FingerprintManagerCompat.AuthenticationCallback Callback structure provided to authenticate(CryptoObject, int, CancellationSignal, AuthenticationCallback, Handler)
FingerprintManagerCompat.AuthenticationResult Container for callback data from authenticate(CryptoObject, int, CancellationSignal, AuthenticationCallback, Handler)
FingerprintManagerCompat.CryptoObject A wrapper class for the crypto objects supported by FingerprintManager. 
FitWidthBitmapDrawable Subclass of Drawable that can be used to draw a bitmap into a region. 
FlingAnimation

Fling animation is an animation that continues an initial momentum (most often from gesture velocity) and gradually slows down. 

FloatingActionButton Floating action buttons are used for a special type of promoted action. 
FloatingActionButton.Behavior Behavior designed for use with FloatingActionButton instances. 
FloatingActionButton.OnVisibilityChangedListener Callback to be invoked when the visibility of a FloatingActionButton changes. 
FloatPropertyCompat<T>

FloatPropertyCompat is an abstraction that can be used to represent a mutable float value that is held in a host object. 

FloatRange Denotes that the annotated element should be a float or double in the given range

Example:


  @FloatRange(from=0.0,to=1.0)
  public float getAlpha() {
      ... 
              
    

            
FloatValueHolder

FloatValueHolder holds a float value. 

FocusHighlight Interface for highlighting the item that has focus. 
FocusHighlightHelper Sets up the highlighting behavior when an item gains focus. 
FontRequest Information about a font request that may be sent to a Font Provider. 
FontRequestEmojiCompatConfig EmojiCompat.Config implementation that asynchronously fetches the required font and the metadata using a FontRequest
FontRequestEmojiCompatConfig.ExponentialBackoffRetryPolicy A retry policy implementation that doubles the amount of time in between retries. 
FontRequestEmojiCompatConfig.RetryPolicy Retry policy used when the font provider is not ready to give the font file. 
FontRes Denotes that an integer parameter, field or method return value is expected to be a font resource reference (e.g. 
FontsContractCompat Utility class to deal with Font ContentProviders. 
FontsContractCompat.Columns Defines the constants used in a response from a Font Provider. 
FontsContractCompat.FontFamilyResult Object returned from fetchFonts(Context, CancellationSignal, FontRequest)
FontsContractCompat.FontInfo Object represent a font entry in the family returned from fetchFonts(Context, CancellationSignal, FontRequest)
FontsContractCompat.FontRequestCallback Interface used to receive asynchronously fetched typefaces. 
FractionRes Denotes that an integer parameter, field or method return value is expected to be a fraction resource reference. 
Fragment Static library support version of the framework's Fragment
Fragment.InstantiationException Thrown by instantiate(Context, String, Bundle) when there is an instantiation failure. 
Fragment.SavedState State information that has been retrieved from a fragment instance through FragmentManager.saveFragmentInstanceState
FragmentActivity Base class for activities that want to use the support-based Fragment and Loader APIs. 
FragmentAnimationProvider FragmentAnimationProvider supplies animations for use during a fragment's onCreateAnimator callback. 
FragmentCompat Helper for accessing features in Fragment in a backwards compatible fashion. 
FragmentCompat.OnRequestPermissionsResultCallback This interface is the contract for receiving the results for permission requests. 
FragmentCompat.PermissionCompatDelegate Customizable delegate that allows delegating permission related compatibility methods to a custom implementation. 
FragmentContainer Callbacks to a Fragment's container. 
FragmentController Provides integration points with a FragmentManager for a fragment host. 
FragmentHostCallback<E> Integration points with the Fragment host. 
FragmentManager Static library support version of the framework's FragmentManager
FragmentManager.BackStackEntry Representation of an entry on the fragment back stack, as created with FragmentTransaction.addToBackStack()
FragmentManager.FragmentLifecycleCallbacks Callback interface for listening to fragment state changes that happen within a given FragmentManager. 
FragmentManager.OnBackStackChangedListener Interface to watch for changes to the back stack. 
FragmentManagerNonConfig FragmentManagerNonConfig stores the retained instance fragments across activity recreation events. 
FragmentPagerAdapter Implementation of PagerAdapter that represents each page as a Fragment that is persistently kept in the fragment manager as long as the user can return to the page. 
FragmentPagerAdapter Implementation of PagerAdapter that represents each page as a Fragment that is persistently kept in the fragment manager as long as the user can return to the page. 
FragmentStatePagerAdapter Implementation of PagerAdapter that uses a Fragment to manage each page. 
FragmentStatePagerAdapter Implementation of PagerAdapter that uses a Fragment to manage each page. 
FragmentTabHost Version of FragmentTabHost that can be used with the platform Fragment APIs. 
FragmentTabHost Special TabHost that allows the use of Fragment objects for its tab content. 
FragmentTransaction Static library support version of the framework's FragmentTransaction
FrameMetricsAggregator This class can be used to record and return data about per-frame durations. 
FullWidthDetailsOverviewRowPresenter Renders a DetailsOverviewRow to display an overview of an item. 
FullWidthDetailsOverviewRowPresenter.Listener Listeners for events on ViewHolder. 
FullWidthDetailsOverviewRowPresenter.ViewHolder A ViewHolder for the DetailsOverviewRow. 
FullWidthDetailsOverviewRowPresenter.ViewHolder.DetailsOverviewRowListener  
FullWidthDetailsOverviewSharedElementHelper Helper class to assist delayed shared element activity transition for view created by FullWidthDetailsOverviewRowPresenter

G

GestureDetectorCompat Detects various gestures and events using the supplied MotionEvents. 
GravityCompat Compatibility shim for accessing newer functionality from Gravity
GridLayout A layout that places its children in a rectangular grid
GridLayout.Alignment Alignments specify where a view should be placed within a cell group and what size it should be. 
GridLayout.LayoutParams Layout information associated with each of the children of a GridLayout. 
GridLayout.Spec A Spec defines the horizontal or vertical characteristics of a group of cells. 
GridLayoutManager A RecyclerView.LayoutManager implementations that lays out items in a grid. 
GridLayoutManager.DefaultSpanSizeLookup Default implementation for GridLayoutManager.SpanSizeLookup
GridLayoutManager.LayoutParams LayoutParams used by GridLayoutManager. 
GridLayoutManager.SpanSizeLookup A helper class to provide the number of spans each item occupies. 
GuardedBy Denotes that the annotated method or field can only be accessed when holding the referenced lock. 
GuidanceStylist GuidanceStylist is used within a GuidedStepFragment to display contextual information for the decision(s) required at that step. 
GuidanceStylist.Guidance A data class representing contextual information for a GuidedStepFragment
GuidedAction A data class which represents an action within a GuidedStepFragment
GuidedAction.Builder Builds a GuidedAction object. 
GuidedAction.BuilderBase<B extends BuilderBase> Base builder class to build a GuidedAction object. 
GuidedActionEditText A custom EditText that satisfies the IME key monitoring requirements of GuidedStepFragment. 
GuidedActionsStylist GuidedActionsStylist is used within a GuidedStepFragment to supply the right-side panel where users can take actions. 
GuidedActionsStylist.ViewHolder ViewHolder caches information about the action item layouts' subviews. 
GuidedDatePickerAction Subclass of GuidedAction that can choose a date. 
GuidedDatePickerAction.Builder Builder class to build a GuidedDatePickerAction. 
GuidedDatePickerAction.BuilderBase<B extends BuilderBase> Base Builder class to build GuidedDatePickerAction. 
GuidedStepFragment A GuidedStepFragment is used to guide the user through a decision or series of decisions. 
GuidedStepSupportFragment A GuidedStepSupportFragment is used to guide the user through a decision or series of decisions. 

H

HalfFloat

Denotes that the annotated element represents a half-precision floating point value. 

HeaderItem A header item describes the metadata of a Row, such as a category of media items. 
HeadersFragment An fragment containing a list of row headers. 
HeadersFragment.OnHeaderClickedListener Interface definition for a callback to be invoked when a header item is clicked. 
HeadersFragment.OnHeaderViewSelectedListener Interface definition for a callback to be invoked when a header item is selected. 
HeadersSupportFragment An fragment containing a list of row headers. 
HeadersSupportFragment.OnHeaderClickedListener Interface definition for a callback to be invoked when a header item is clicked. 
HeadersSupportFragment.OnHeaderViewSelectedListener Interface definition for a callback to be invoked when a header item is selected. 
HorizontalGridView A ViewGroup that shows items in a horizontal scrolling list. 
HorizontalHoverCardSwitcher A helper class for showing a hover card view below a HorizontalGridView

I

IconCompat Helper for accessing features in Icon
ICUCompat  
IdRes Denotes that an integer parameter, field or method return value is expected to be an id resource reference (e.g. 
ImageCardView A subclass of BaseCardView with an ImageView as its main region. 
ImageViewCompat Helper for accessing features in ImageView
ImeKeyMonitor Interface for an EditText subclass that can delegate calls to onKeyPreIme up to a registered listener. 
ImeKeyMonitor.ImeKeyListener Listener interface for key events intercepted pre-IME by edit text objects. 
InputConnectionCompat Helper for accessing features in InputConnection introduced after API level 13 in a backwards compatible fashion. 
InputConnectionCompat.OnCommitContentListener Listener for commitContent method call, in a backwards compatible fashion. 
InputContentInfoCompat Helper for accessing features in InputContentInfo introduced after API level 13 in a backwards compatible fashion. 
InputDeviceCompat Helper class for accessing values in InputDevice
IntDef Denotes that the annotated element of integer type, represents a logical type and that its value should be one of the explicitly named constants. 
IntegerRes Denotes that an integer parameter, field or method return value is expected to be an integer resource reference (e.g. 
IntentCompat Helper for accessing features in Intent
IntentConstants Constants used for sending intent between client and service apks. 
InterpolatorRes Denotes that an integer parameter, field or method return value is expected to be an interpolator resource reference (e.g. 
IntRange Denotes that the annotated element should be an int or long in the given range

Example:


  @IntRange(from=0,to=255)
  public int getAlpha() {
      ... 
              
    

            
ItemAlignmentFacet Optional facet provided by RecyclerView.Adapter or RecyclerView.ViewHolder for use in HorizontalGridView and VerticalGridView
ItemAlignmentFacet.ItemAlignmentDef Definition of an alignment position under a view. 
ItemBridgeAdapter Bridge from Presenter to RecyclerView.Adapter
ItemBridgeAdapter.AdapterListener Interface for listening to ViewHolder operations. 
ItemBridgeAdapter.ViewHolder ViewHolder for the ItemBridgeAdapter. 
ItemBridgeAdapter.Wrapper Interface for wrapping a view created by a Presenter into another view. 
ItemBridgeAdapterShadowOverlayWrapper A wrapper class working with ItemBridgeAdapter to wrap item view in a ShadowOverlayContainer
ItemTouchHelper This is a utility class to add swipe to dismiss and drag & drop support to RecyclerView. 
ItemTouchHelper.Callback This class is the contract between ItemTouchHelper and your application. 
ItemTouchHelper.SimpleCallback A simple wrapper to the default Callback which you can construct with drag and swipe directions and this class will handle the flag callbacks. 
ItemTouchHelper.ViewDropHandler An interface which can be implemented by LayoutManager for better integration with ItemTouchHelper
ItemTouchUIUtil Utility class for ItemTouchHelper which handles item transformations for different API versions. 

J

JobIntentService Helper for processing work that has been enqueued for a job/service. 

K

Keep Denotes that the annotated element should not be removed when the code is minified at build time. 

L

LayoutInflaterCompat Helper for accessing features in LayoutInflater
LayoutInflaterFactory This interface was deprecated in API level 26.1.0. Use LayoutInflater.Factory2 directly.  
LayoutRes Denotes that an integer parameter, field or method return value is expected to be a layout resource reference (e.g. 
LeanbackListPreferenceDialogFragment  
LeanbackListPreferenceDialogFragment.AdapterMulti  
LeanbackListPreferenceDialogFragment.AdapterSingle  
LeanbackListPreferenceDialogFragment.ViewHolder  
LeanbackListPreferenceDialogFragment.ViewHolder.OnItemClickListener  
LeanbackPreferenceDialogFragment  
LeanbackPreferenceFragment This fragment provides a fully decorated leanback-style preference fragment, including a list background and header. 
LeanbackSettingsFragment This fragment provides a container for displaying a LeanbackPreferenceFragment

The following sample code shows a simple leanback preference fragment that is populated from a resource. 

LinearLayoutCompat A Layout that arranges its children in a single column or a single row. 
LinearLayoutCompat.LayoutParams Per-child layout information associated with ViewLinearLayout. 
LinearLayoutManager A RecyclerView.LayoutManager implementation which provides similar functionality to ListView
LinearLayoutManager.LayoutChunkResult  
LinearOutSlowInInterpolator Interpolator corresponding to linear_out_slow_in
LinearSmoothScroller RecyclerView.SmoothScroller implementation which uses a LinearInterpolator until the target position becomes a child of the RecyclerView and then uses a DecelerateInterpolator to slowly approach to target position. 
LinearSnapHelper Implementation of the SnapHelper supporting snapping in either vertical or horizontal orientation. 
LinkifyCompat LinkifyCompat brings in Linkify improvements for URLs and email addresses to older API levels. 
ListFragment Static library support version of the framework's ListFragment
ListPopupWindow Static library support version of the framework's ListPopupWindow
ListPopupWindowCompat Helper for accessing features in ListPopupWindow
ListPreference A Preference that displays a list of entries as a dialog. 
ListPreferenceDialogFragment  
ListPreferenceDialogFragmentCompat  
ListRow A Row composed of a optional HeaderItem, and an ObjectAdapter describing the items in the list. 
ListRowHoverCardView ListRowHoverCardView contains a title and description. 
ListRowPresenter ListRowPresenter renders ListRow using a HorizontalGridView hosted in a ListRowView
ListRowPresenter.SelectItemViewHolderTask A task on the ListRowPresenter.ViewHolder that can select an item by position in the HorizontalGridView and perform an optional item task on it. 
ListRowPresenter.ViewHolder ViewHolder for the ListRowPresenter. 
ListRowView ListRowView is a ViewGroup which always contains a HorizontalGridView, and may optionally include a hover card. 
ListUpdateCallback An interface that can receive Update operations that are applied to a list. 
ListViewAutoScrollHelper An implementation of AutoScrollHelper that knows how to scroll through a ListView
ListViewCompat Helper for accessing features in ListView  
Loader<D> Static library support version of the framework's Loader
Loader.ForceLoadContentObserver An implementation of a ContentObserver that takes care of connecting it to the Loader to have the loader re-load its data when the observer is told it has changed. 
Loader.OnLoadCanceledListener<D> Interface that is implemented to discover when a Loader has been canceled before it finished loading its data. 
Loader.OnLoadCompleteListener<D> Interface that is implemented to discover when a Loader has finished loading its data. 
LoaderManager Static library support version of the framework's LoaderManager
LoaderManager.LoaderCallbacks<D> Callback interface for a client to interact with the manager. 
LoaderQueryRunner A ContentPager.QueryRunner that executes queries using a LoaderManager
LocalBroadcastManager Helper to register for and send broadcasts of Intents to local objects within your process. 
LocaleListCompat Helper for accessing features in LocaleList
LongSparseArray<E> SparseArray mapping longs to Objects, a version of the platform's LongSparseArray that can be used on older versions of the platform. 
LruCache<K, V> Static library version of LruCache

M

MainThread Denotes that the annotated method should only be called on the main thread. 
MarginLayoutParamsCompat Helper for accessing API features in MarginLayoutParams in a backwards compatible way. 
MathUtils A utility class providing functions useful for common mathematical operations. 
MediaBrowserCompat Browses media content offered by a MediaBrowserServiceCompat
MediaBrowserCompat.ConnectionCallback Callbacks for connection related events. 
MediaBrowserCompat.CustomActionCallback Callback for receiving the result of sendCustomAction(String, Bundle, MediaBrowserCompat.CustomActionCallback)
MediaBrowserCompat.ItemCallback Callback for receiving the result of getItem(String, MediaBrowserCompat.ItemCallback)
MediaBrowserCompat.MediaItem A class with information on a single media item for use in browsing/searching media. 
MediaBrowserCompat.SearchCallback Callback for receiving the result of search(String, Bundle, MediaBrowserCompat.SearchCallback)
MediaBrowserCompat.SubscriptionCallback Callbacks for subscription related events. 
MediaBrowserConstants Constants for testing the media browser and service. 
MediaBrowserServiceCompat Base class for media browse services. 
MediaBrowserServiceCompat.BrowserRoot Contains information that the browser service needs to send to the client when first connected. 
MediaBrowserServiceCompat.Result<T> Completion handler for asynchronous callback methods in MediaBrowserServiceCompat
MediaButtonReceiver A media button receiver receives and helps translate hardware media playback buttons, such as those found on wired and wireless headsets, into the appropriate callbacks in your app. 
MediaControlIntent Constants for media control intents. 
MediaControllerAdapter A helper class for implementing a adapter layer for MediaControllerCompat
MediaControllerCompat Allows an app to interact with an ongoing media session. 
MediaControllerCompat.Callback Callback for receiving updates on from the session. 
MediaControllerCompat.PlaybackInfo Holds information about the way volume is handled for this session. 
MediaControllerCompat.TransportControls Interface for controlling media playback on a session. 
MediaControllerGlue This class was deprecated in API level 27.0.0. Use MediaControllerAdapter with PlaybackTransportControlGlue or PlaybackBannerControlGlue.  
MediaDescriptionCompat A simple set of metadata for a media item suitable for display. 
MediaDescriptionCompat.Builder Builder for MediaDescriptionCompat objects. 
MediaItemMetadata Constants for specifying metadata about a media item as a Bundle
MediaItemStatus Describes the playback status of a media item. 
MediaItemStatus.Builder Builder for media item status objects
MediaMetadataCompat Contains metadata about an item, such as the title, artist, etc. 
MediaMetadataCompat.Builder Use to build MediaMetadata objects. 
MediaPlayerAdapter This implementation extends the PlayerAdapter with a MediaPlayer
MediaRouteActionProvider The media route action provider displays a media route button in the application's ActionBar to allow the user to select routes and to control the currently selected route. 
MediaRouteButton The media route button allows the user to select routes and to control the currently selected route. 
MediaRouteChooserDialog This class implements the route chooser dialog for MediaRouter
MediaRouteChooserDialogFragment Media route chooser dialog fragment. 
MediaRouteControllerDialog This class implements the route controller dialog for MediaRouter
MediaRouteControllerDialogFragment Media route controller dialog fragment. 
MediaRouteDescriptor Describes the properties of a route. 
MediaRouteDescriptor.Builder Builder for media route descriptors
MediaRouteDialogFactory The media route dialog factory is responsible for creating the media route chooser and controller dialogs as needed. 
MediaRouteDiscoveryFragment Media route discovery fragment. 
MediaRouteDiscoveryRequest Describes the kinds of routes that the media router would like to discover and whether to perform active scanning. 
MediaRouteProvider Media route providers are used to publish additional media routes for use within an application. 
MediaRouteProvider.Callback Callback which is invoked when route information becomes available or changes. 
MediaRouteProvider.ProviderMetadata Describes properties of the route provider's implementation. 
MediaRouteProvider.RouteController Provides control over a particular route. 
MediaRouteProviderDescriptor Describes the state of a media route provider and the routes that it publishes. 
MediaRouteProviderDescriptor.Builder Builder for media route provider descriptors
MediaRouteProviderService Base class for media route provider services. 
MediaRouter MediaRouter allows applications to control the routing of media channels and streams from the current device to external speakers and destination devices. 
MediaRouter.Callback Interface for receiving events about media routing changes. 
MediaRouter.ControlRequestCallback Callback which is invoked with the result of a media control request. 
MediaRouter.ProviderInfo Provides information about a media route provider. 
MediaRouter.RouteInfo Provides information about a media route. 
MediaRouteSelector Describes the capabilities of routes that applications would like to discover and use. 
MediaRouteSelector.Builder Builder for media route selectors
MediaSessionCompat Allows interaction with media controllers, volume keys, media buttons, and transport controls. 
MediaSessionCompat.Callback Receives transport controls, media buttons, and commands from controllers and the system. 
MediaSessionCompat.OnActiveChangeListener  
MediaSessionCompat.QueueItem A single item that is part of the play queue. 
MediaSessionCompat.Token Represents an ongoing session. 
MediaSessionStatus Describes the playback status of a media session. 
MediaSessionStatus.Builder Builder for media session status objects
MenuCompat Helper for accessing features in Menu
MenuItemCompat Helper for accessing features in MenuItem
MenuItemCompat.OnActionExpandListener This interface was deprecated in API level 26.1.0. Use MenuItem.OnActionExpandListener directly.  
MenuRes Denotes that an integer parameter, field or method return value is expected to be a menu resource reference. 
MetadataConstants Constants for android wear apps which are related to manifest meta-data. 
MetadataRepo Class to hold the emoji metadata required to process and draw emojis. 
MimeTypeFilter Provides utility methods for matching MIME type filters used in ContentProvider. 
MotionEventCompat Helper for accessing features in MotionEvent
MultiActionsProvider An interface implemented by the user if they wish to provide actions for a media item row to be displayed by an AbstractMediaItemPresenter
MultiActionsProvider.MultiAction MultiAction represents an action that can have multiple states. 
MultiSelectListPreference A Preference that displays a list of entries as a dialog. 
MultiSelectListPreferenceDialogFragment  
MultiSelectListPreferenceDialogFragmentCompat  

N

NavigationRes Denotes that an integer parameter, field or method return value is expected to be a navigation resource reference (e.g. 
NavigationView Represents a standard navigation menu for application. 
NavigationView.OnNavigationItemSelectedListener Listener for handling events on navigation items. 
NavigationView.SavedState User interface state that is stored by NavigationView for implementing onSaveInstanceState(). 
NavUtils NavUtils provides helper functionality for applications implementing recommended Android UI navigation patterns. 
NestedScrollingChild This interface should be implemented by View subclasses that wish to support dispatching nested scrolling operations to a cooperating parent ViewGroup
NestedScrollingChild2 This interface should be implemented by View subclasses that wish to support dispatching nested scrolling operations to a cooperating parent ViewGroup
NestedScrollingChildHelper Helper class for implementing nested scrolling child views compatible with Android platform versions earlier than Android 5.0 Lollipop (API 21). 
NestedScrollingParent This interface should be implemented by ViewGroup subclasses that wish to support scrolling operations delegated by a nested child view. 
NestedScrollingParent2 This interface should be implemented by ViewGroup subclasses that wish to support scrolling operations delegated by a nested child view. 
NestedScrollingParentHelper Helper class for implementing nested scrolling parent views compatible with Android platform versions earlier than Android 5.0 Lollipop (API 21). 
NestedScrollView NestedScrollView is just like ScrollView, but it supports acting as both a nested scrolling parent and child on both new and old versions of Android. 
NestedScrollView.OnScrollChangeListener Interface definition for a callback to be invoked when the scroll X or Y positions of a view change. 
NonNull Denotes that a parameter, field or method return value can never be null. 
NotificationCompat Helper for accessing features in Notification
NotificationCompat Class containing media specfic styles that you can use with setStyle(NotificationCompat.Style)
NotificationCompat.Action Structure to encapsulate a named action that can be shown as part of this notification. 
NotificationCompat.Action.Builder Builder class for NotificationCompat.Action objects. 
NotificationCompat.Action.Extender Extender interface for use with extend(NotificationCompat.Extender)
NotificationCompat.Action.WearableExtender Wearable extender for notification actions. 
NotificationCompat.BigPictureStyle Helper class for generating large-format notifications that include a large image attachment. 
NotificationCompat.BigTextStyle Helper class for generating large-format notifications that include a lot of text. 
NotificationCompat.Builder Builder class for NotificationCompat objects. 
NotificationCompat.CarExtender

Helper class to add Android Auto extensions to notifications. 

NotificationCompat.CarExtender.UnreadConversation A class which holds the unread messages from a conversation. 
NotificationCompat.CarExtender.UnreadConversation.Builder Builder class for NotificationCompat.CarExtender.UnreadConversation objects. 
NotificationCompat.DecoratedCustomViewStyle Notification style for custom views that are decorated by the system. 
NotificationCompat.DecoratedMediaCustomViewStyle Notification style for media custom views that are decorated by the system. 
NotificationCompat.Extender Extender interface for use with extend(NotificationCompat.Extender)
NotificationCompat.InboxStyle Helper class for generating large-format notifications that include a list of (up to 5) strings. 
NotificationCompat.MediaStyle Notification style for media playback notifications. 
NotificationCompat.MessagingStyle Helper class for generating large-format notifications that include multiple back-and-forth messages of varying types between any number of people. 
NotificationCompat.MessagingStyle.Message  
NotificationCompat.Style An object that can apply a rich notification style to a Notification.CarExtender.Builder object. 
NotificationCompat.WearableExtender Helper class to add wearable extensions to notifications. 
NotificationCompatExtras Well-known extras used by NotificationCompat for backwards compatibility. 
NotificationCompatSideChannelService Abstract service to receive side channel notifications sent from NotificationManagerCompat
NotificationManagerCompat Compatibility library for NotificationManager with fallbacks for older platforms. 
Nullable Denotes that a parameter, field or method return value can be null. 

O

ObjectAdapter Base class adapter to be used in leanback activities. 
ObjectAdapter.DataObserver A DataObserver can be notified when an ObjectAdapter's underlying data changes. 
ObjectsCompat This class consists of static utility methods for operating on objects. 
OnActionClickedListener Interface for receiving notification when an Action is clicked. 
OnApplyWindowInsetsListener Listener for applying window insets on a view in a custom way. 
OnboardingFragment An OnboardingFragment provides a common and simple way to build onboarding screen for applications. 
OnboardingSupportFragment An OnboardingSupportFragment provides a common and simple way to build onboarding screen for applications. 
OnChildLaidOutListener Interface for receiving notification when a child of this ViewGroup has been laid out. 
OnChildSelectedListener This interface was deprecated in API level 24.1.0. Use OnChildViewHolderSelectedListener  
OnChildViewHolderSelectedListener Interface for receiving notification when a child of this ViewGroup has been selected. 
OnItemViewClickedListener Interface for receiving notification when a item view holder is clicked. 
OnItemViewSelectedListener Interface for receiving notification when a row or item becomes selected. 
OperationCanceledException An exception type that is thrown when an operation in progress is canceled. 
OrientationHelper Helper class for LayoutManagers to abstract measurements depending on the View's orientation. 

P

PagerAdapter Base class providing the adapter to populate pages inside of a ViewPager
PageRow Used to represent content spanning full page. 
PagerSnapHelper Implementation of the SnapHelper supporting pager style snapping in either vertical or horizontal orientation. 
PagerTabStrip PagerTabStrip is an interactive indicator of the current, next, and previous pages of a ViewPager
PagerTitleStrip PagerTitleStrip is a non-interactive indicator of the current, next, and previous pages of a ViewPager
PaintCompat Helper for accessing features in Paint
Pair<F, S> Container to ease passing around a tuple of two objects. 
Palette A helper class to extract prominent colors from an image. 
Palette.Builder Builder class for generating Palette instances. 
Palette.Filter A Filter provides a mechanism for exercising fine-grained control over which colors are valid within a resulting Palette
Palette.PaletteAsyncListener Listener to be used with generateAsync(Bitmap, PaletteAsyncListener) or generateAsync(Bitmap, int, PaletteAsyncListener)  
Palette.Swatch Represents a color swatch generated from an image's palette. 
Parallax<PropertyT extends Property> Parallax tracks a list of dynamic Propertys typically representing foreground UI element positions on screen. 
Parallax.FloatProperty FloatProperty provide access to an index based integer type property inside Parallax
Parallax.IntProperty IntProperty provide access to an index based integer type property inside Parallax
Parallax.PropertyMarkerValue<PropertyT> Class holding a fixed value for a Property in Parallax
ParallaxEffect ParallaxEffect class drives changes in ParallaxTarget in response to changes in variables defined in Parallax
ParallaxTarget ParallaxTarget is responsible for updating the target through the update(float) method or the directUpdate(Number) method when isDirectMapping() is true. 
ParallaxTarget.DirectPropertyTarget<T, V extends Number> DirectPropertyTarget is to support direct mapping into either Integer Property or Float Property. 
ParallaxTarget.PropertyValuesHolderTarget PropertyValuesHolderTarget is an implementation of ParallaxTarget that uses PropertyValuesHolder to update the target object. 
ParcelableCompat This class was deprecated in API level 26.1.0. Use Parcelable.ClassLoaderCreator directly.  
ParcelableCompatCreatorCallbacks<T> This interface was deprecated in API level 26.1.0. Use Parcelable.ClassLoaderCreator directly.  
ParcelableVolumeInfo Convenience class for passing information about the audio configuration of a MediaSessionCompat
PathInterpolatorCompat Helper for creating path-based Interpolator instances. 
PathMotion This base class can be extended to provide motion along a Path to Transitions. 
PatternPathMotion A PathMotion that takes a Path pattern and applies it to the separation between two points. 
PatternsCompat Commonly used regular expression patterns. 
PercentFrameLayout This class was deprecated in API level 26.1.0. consider using ConstraintLayout and associated layouts instead. The following shows how to replicate the functionality of percentage layouts with a ConstraintLayout. The Guidelines are used to define each percentage break point, and then a Button view is stretched to fill the gap:
 <android.support.constraint.ConstraintLayout
         xmlns:android="http://schemas.android.com/apk/res/android"
         xmlns:app="http://schemas.android.com/apk/res-auto"
         android:layout_width="match_parent"
         android:layout_height="match_parent">

     <android.support.constraint.Guideline
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:id="@+id/left_guideline"
         app:layout_constraintGuide_percent=".15"
         android:orientation="vertical"/>

     <android.support.constraint.Guideline
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:id="@+id/right_guideline"
         app:layout_constraintGuide_percent=".85"
         android:orientation="vertical"/>

     <android.support.constraint.Guideline
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:id="@+id/top_guideline"
         app:layout_constraintGuide_percent=".15"
         android:orientation="horizontal"/>

     <android.support.constraint.Guideline
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:id="@+id/bottom_guideline"
         app:layout_constraintGuide_percent=".85"
         android:orientation="horizontal"/>

     <Button
         android:text="Button"
         android:layout_width="0dp"
         android:layout_height="0dp"
         android:id="@+id/button"
         app:layout_constraintLeft_toLeftOf="@+id/left_guideline"
         app:layout_constraintRight_toRightOf="@+id/right_guideline"
         app:layout_constraintTop_toTopOf="@+id/top_guideline"
         app:layout_constraintBottom_toBottomOf="@+id/bottom_guideline" />

 </android.support.constraint.ConstraintLayout>
 
 
PercentFrameLayout.LayoutParams This class was deprecated in API level 26.1.0. this class is deprecated along with its parent class.  
PercentLayoutHelper This class was deprecated in API level 26.1.0. consider using ConstraintLayout and associated layouts instead. The following shows how to replicate the functionality of percentage layouts with a ConstraintLayout. The Guidelines are used to define each percentage break point, and then a Button view is stretched to fill the gap:
 <android.support.constraint.ConstraintLayout
         xmlns:android="http://schemas.android.com/apk/res/android"
         xmlns:app="http://schemas.android.com/apk/res-auto"
         android:layout_width="match_parent"
         android:layout_height="match_parent">

     <android.support.constraint.Guideline
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:id="@+id/left_guideline"
         app:layout_constraintGuide_percent=".15"
         android:orientation="vertical"/>

     <android.support.constraint.Guideline
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:id="@+id/right_guideline"
         app:layout_constraintGuide_percent=".85"
         android:orientation="vertical"/>

     <android.support.constraint.Guideline
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:id="@+id/top_guideline"
         app:layout_constraintGuide_percent=".15"
         android:orientation="horizontal"/>

     <android.support.constraint.Guideline
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:id="@+id/bottom_guideline"
         app:layout_constraintGuide_percent=".85"
         android:orientation="horizontal"/>

     <Button
         android:text="Button"
         android:layout_width="0dp"
         android:layout_height="0dp"
         android:id="@+id/button"
         app:layout_constraintLeft_toLeftOf="@+id/left_guideline"
         app:layout_constraintRight_toRightOf="@+id/right_guideline"
         app:layout_constraintTop_toTopOf="@+id/top_guideline"
         app:layout_constraintBottom_toBottomOf="@+id/bottom_guideline" />

 </android.support.constraint.ConstraintLayout>
 
              
    

            
PercentLayoutHelper.PercentLayoutInfo This class was deprecated in API level 26.1.0. use ConstraintLayout and Guidelines for layout support.  
PercentLayoutHelper.PercentLayoutParams This interface was deprecated in API level 26.1.0. this class is deprecated along with its parent class.  
PercentRelativeLayout This class was deprecated in API level 26.1.0. consider using ConstraintLayout and associated layouts instead. The following shows how to replicate the functionality of percentage layouts with a ConstraintLayout. The Guidelines are used to define each percentage break point, and then a Button view is stretched to fill the gap:
 <android.support.constraint.ConstraintLayout
         xmlns:android="http://schemas.android.com/apk/res/android"
         xmlns:app="http://schemas.android.com/apk/res-auto"
         android:layout_width="match_parent"
         android:layout_height="match_parent">

     <android.support.constraint.Guideline
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:id="@+id/left_guideline"
         app:layout_constraintGuide_percent=".15"
         android:orientation="vertical"/>

     <android.support.constraint.Guideline
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:id="@+id/right_guideline"
         app:layout_constraintGuide_percent=".85"
         android:orientation="vertical"/>

     <android.support.constraint.Guideline
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:id="@+id/top_guideline"
         app:layout_constraintGuide_percent=".15"
         android:orientation="horizontal"/>

     <android.support.constraint.Guideline
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:id="@+id/bottom_guideline"
         app:layout_constraintGuide_percent=".85"
         android:orientation="horizontal"/>

     <Button
         android:text="Button"
         android:layout_width="0dp"
         android:layout_height="0dp"
         android:id="@+id/button"
         app:layout_constraintLeft_toLeftOf="@+id/left_guideline"
         app:layout_constraintRight_toRightOf="@+id/right_guideline"
         app:layout_constraintTop_toTopOf="@+id/top_guideline"
         app:layout_constraintBottom_toBottomOf="@+id/bottom_guideline" />

 </android.support.constraint.ConstraintLayout>
 
              
    

            
PercentRelativeLayout.LayoutParams This class was deprecated in API level 26.1.0. this class is deprecated along with its parent class.  
PermissionChecker This class provides permission check APIs that verify both the permission and the associated app op for this permission if such is defined. 
Picker Picker is a widget showing multiple customized PickerColumns. 
Picker.PickerValueListener  
PickerColumn Picker column class used by Picker, defines a contiguous value ranges and associated labels. 
PlaybackBannerControlGlue<T extends PlayerAdapter> A helper class for managing a PlaybackControlsRow being displayed in PlaybackGlueHost
PlaybackBaseControlGlue<T extends PlayerAdapter> A base abstract class for managing a PlaybackControlsRow being displayed in PlaybackGlueHost
PlaybackControlGlue A helper class for managing a PlaybackControlsRow and PlaybackGlueHost that implements a recommended approach to handling standard playback control actions such as play/pause, fast forward/rewind at progressive speed levels, and skip to next/previous. 
PlaybackControlsRow A Row of playback controls to be displayed by a PlaybackControlsRowPresenter
PlaybackControlsRow.ClosedCaptioningAction An action for displaying a CC (Closed Captioning) icon. 
PlaybackControlsRow.FastForwardAction An action displaying an icon for fast forward. 
PlaybackControlsRow.HighQualityAction An action for displaying a HQ (High Quality) icon. 
PlaybackControlsRow.MoreActions An action displaying an icon for "more actions". 
PlaybackControlsRow.MultiAction Base class for an action comprised of a series of icons. 
PlaybackControlsRow.OnPlaybackProgressCallback Listener for progress or duration change. 
PlaybackControlsRow.PictureInPictureAction An action displaying an icon for picture-in-picture. 
PlaybackControlsRow.PlayPauseAction An action displaying icons for play and pause. 
PlaybackControlsRow.RepeatAction An action for displaying three repeat states: none, one, or all. 
PlaybackControlsRow.RewindAction An action displaying an icon for rewind. 
PlaybackControlsRow.ShuffleAction An action for displaying a shuffle icon. 
PlaybackControlsRow.SkipNextAction An action displaying an icon for skip next. 
PlaybackControlsRow.SkipPreviousAction An action displaying an icon for skip previous. 
PlaybackControlsRow.ThumbsAction A base class for displaying a thumbs action. 
PlaybackControlsRow.ThumbsDownAction An action displaying an icon for thumbs down. 
PlaybackControlsRow.ThumbsUpAction An action displaying an icon for thumbs up. 
PlaybackControlsRowPresenter A PlaybackControlsRowPresenter renders a PlaybackControlsRow to display a series of playback control buttons. 
PlaybackControlsRowPresenter.ViewHolder A ViewHolder for the PlaybackControlsRow. 
PlaybackFragment A fragment for displaying playback controls and related content. 
PlaybackFragmentGlueHost PlaybackGlueHost implementation the interaction between this class and PlaybackFragment
PlaybackGlue Base class for abstraction of media play/pause feature. 
PlaybackGlue.PlayerCallback Interface to allow clients to take action once the video is ready to play and start stop. 
PlaybackGlueHost This class represents the UI (e.g. 
PlaybackGlueHost.HostCallback Callbacks triggered by the host(e.g. 
PlaybackGlueHost.PlayerCallback Optional Client that implemented by PlaybackGlueHost to respond to player event. 
PlaybackRowPresenter Subclass of RowPresenter that can define the desired behavior when the view reappears. 
PlaybackRowPresenter.ViewHolder This container is used for trapping click events and passing them to the playback controls. 
PlaybackSeekDataProvider Class to be implemented by app to provide seeking data and thumbnails to UI. 
PlaybackSeekDataProvider.ResultCallback Client to receive result for getThumbnail(int, ResultCallback)
PlaybackSeekUi Interface to be implemented by UI component to support seeking. 
PlaybackSeekUi.Client Client (e.g. 
PlaybackStateCompat Playback state for a MediaSessionCompat
PlaybackStateCompat.Builder Builder for PlaybackStateCompat objects. 
PlaybackStateCompat.CustomAction CustomActions can be used to extend the capabilities of the standard transport controls by exposing app specific actions to Controllers
PlaybackStateCompat.CustomAction.Builder Builder for PlaybackStateCompat.CustomAction objects. 
PlaybackSupportFragment A fragment for displaying playback controls and related content. 
PlaybackSupportFragmentGlueHost PlaybackGlueHost implementation the interaction between this class and PlaybackSupportFragment
PlaybackTransportControlGlue<T extends PlayerAdapter> A helper class for managing a PlaybackControlsRow being displayed in PlaybackGlueHost, it supports standard playback control actions play/pause, and skip next/previous. 
PlaybackTransportRowPresenter A PlaybackTransportRowPresenter renders a PlaybackControlsRow to display a series of playback control buttons. 
PlaybackTransportRowPresenter.ViewHolder A ViewHolder for the PlaybackControlsRow supporting seek UI. 
PlayerAdapter Base class that wraps underlying media player. 
PlayerAdapter.Callback Client for client of PlayerAdapter. 
PluralsRes Denotes that an integer parameter, field or method return value is expected to be a plurals resource reference. 
PointerIconCompat Helper for accessing features in PointerIcon in a backwards compatible fashion. 
Pools Helper class for creating pools of objects. 
Pools.Pool<T> Interface for managing a pool of objects. 
Pools.SimplePool<T> Simple (non-synchronized) pool of objects. 
Pools.SynchronizedPool<T> Synchronized) pool of objects. 
PopupMenu Static library support version of the framework's PopupMenu
PopupMenu.OnDismissListener Callback interface used to notify the application that the menu has closed. 
PopupMenu.OnMenuItemClickListener Interface responsible for receiving menu item click events if the items themselves do not have individual item click listeners. 
PopupMenuCompat Helper for accessing features in PopupMenu
PopupWindowCompat Helper for accessing features in PopupWindow
PostMessageService A service to receive postMessage related communication from a Custom Tabs provider. 
PostMessageServiceConnection A ServiceConnection for Custom Tabs providers to use while connecting to a PostMessageService on the client side. 
Preference Represents the basic Preference UI building block displayed by a PreferenceFragmentCompat in the form of a RecyclerView
Preference.BaseSavedState A base class for managing the instance state of a Preference
Preference.OnPreferenceChangeListener Interface definition for a callback to be invoked when the value of this Preference has been changed by the user and is about to be set and/or persisted. 
Preference.OnPreferenceClickListener Interface definition for a callback to be invoked when a Preference is clicked. 
PreferenceCategory Used to group Preference objects and provide a disabled title above the group. 
PreferenceDataStore A data store interface to be implemented and provided to the Preferences framework. 
PreferenceDialogFragment Abstract base class which presents a dialog associated with a DialogPreference
PreferenceDialogFragmentCompat Abstract base class which presents a dialog associated with a DialogPreference
PreferenceFragment Shows a hierarchy of Preference objects as lists. 
PreferenceFragment.OnPreferenceDisplayDialogCallback  
PreferenceFragment.OnPreferenceStartFragmentCallback Interface that PreferenceFragment's containing activity should implement to be able to process preference items that wish to switch to a specified fragment. 
PreferenceFragment.OnPreferenceStartScreenCallback Interface that PreferenceFragment's containing activity should implement to be able to process preference items that wish to switch to a new screen of preferences. 
PreferenceFragmentCompat Shows a hierarchy of Preference objects as lists. 
PreferenceFragmentCompat.OnPreferenceDisplayDialogCallback  
PreferenceFragmentCompat.OnPreferenceStartFragmentCallback Interface that PreferenceFragment's containing activity should implement to be able to process preference items that wish to switch to a specified fragment. 
PreferenceFragmentCompat.OnPreferenceStartScreenCallback Interface that PreferenceFragment's containing activity should implement to be able to process preference items that wish to switch to a new screen of preferences. 
PreferenceGroup A container for multiple Preference objects. 
PreferenceGroup.PreferencePositionCallback Interface for PreferenceGroup Adapters to implement so that scrollToPreference(String) and scrollToPreference(Preference) or scrollToPreference(String) and scrollToPreference(Preference) can determine the correct scroll position to request. 
PreferenceManager Used to help create Preference hierarchies from activities or XML. 
PreferenceManager.OnDisplayPreferenceDialogListener Interface definition for a class that will be called when a Preference requests to display a dialog. 
PreferenceManager.OnNavigateToScreenListener Interface definition for a class that will be called when a PreferenceScreen requests navigation. 
PreferenceManager.OnPreferenceTreeClickListener Interface definition for a callback to be invoked when a Preference in the hierarchy rooted at this PreferenceScreen is clicked. 
PreferenceManager.PreferenceComparisonCallback Callback class to be used by the RecyclerView.Adapter associated with the PreferenceScreen, used to determine when two Preference objects are semantically and visually the same. 
PreferenceManager.SimplePreferenceComparisonCallback A basic implementation of PreferenceManager.PreferenceComparisonCallback suitable for use with the default Preference classes. 
PreferenceScreen Represents a top-level Preference that is the root of a Preference hierarchy. 
PreferenceViewHolder A RecyclerView.ViewHolder class which caches views associated with the default Preference layouts. 
Presenter A Presenter is used to generate Views and bind Objects to them on demand. 
Presenter.ViewHolder ViewHolder can be subclassed and used to cache any view accessors needed to improve binding performance (for example, results of findViewById) without needing to subclass a View. 
Presenter.ViewHolderTask Base class to perform a task on Presenter.ViewHolder. 
PresenterSelector A PresenterSelector is used to obtain a Presenter for a given Object. 
PresenterSwitcher An abstract helper class that switches a view in its parent view using a PresenterSelector
PreviewProgram A convenience class to access TvContractCompat.PreviewPrograms entries in the system content provider. 
PreviewProgram.Builder This Builder class simplifies the creation of a PreviewProgram object. 
PrintHelper Helper for printing bitmaps. 
PrintHelper.OnPrintFinishCallback Callback for observing when a print operation is completed. 
Program A convenience class to access TvContractCompat.Programs entries in the system content provider. 
Program.Builder This Builder class simplifies the creation of a Program object. 
ProgressBarManager Manager for showing/hiding progress bar widget. 
Px Denotes that an integer parameter, field or method return value is expected to represent a pixel dimension. 

Q

Query Encapsulates information related to calling query(Uri, String[], Bundle, CancellationSignal), including the logic determining the best query method to call. 

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RatingCompat A class to encapsulate rating information used as content metadata. 
RawRes Denotes that an integer parameter, field or method return value is expected to be a raw resource reference. 
RecommendationExtender

Helper class to add content info extensions to notifications. 

RecyclerView A flexible view for providing a limited window into a large data set. 
RecyclerView.Adapter<VH extends RecyclerView.ViewHolder> Base class for an Adapter

Adapters provide a binding from an app-specific data set to views that are displayed within a RecyclerView

RecyclerView.AdapterDataObserver Observer base class for watching changes to an RecyclerView.Adapter
RecyclerView.ChildDrawingOrderCallback A callback interface that can be used to alter the drawing order of RecyclerView children. 
RecyclerView.ItemAnimator This class defines the animations that take place on items as changes are made to the adapter. 
RecyclerView.ItemAnimator.AdapterChanges The set of flags that might be passed to recordPreLayoutInformation(State, ViewHolder, int, List)
RecyclerView.ItemAnimator.ItemAnimatorFinishedListener This interface is used to inform listeners when all pending or running animations in an ItemAnimator are finished. 
RecyclerView.ItemAnimator.ItemHolderInfo A simple data structure that holds information about an item's bounds. 
RecyclerView.ItemDecoration An ItemDecoration allows the application to add a special drawing and layout offset to specific item views from the adapter's data set. 
RecyclerView.LayoutManager A LayoutManager is responsible for measuring and positioning item views within a RecyclerView as well as determining the policy for when to recycle item views that are no longer visible to the user. 
RecyclerView.LayoutManager.LayoutPrefetchRegistry Interface for LayoutManagers to request items to be prefetched, based on position, with specified distance from viewport, which indicates priority. 
RecyclerView.LayoutManager.Properties Some general properties that a LayoutManager may want to use. 
RecyclerView.LayoutParams LayoutParams subclass for children of RecyclerView
RecyclerView.OnChildAttachStateChangeListener A Listener interface that can be attached to a RecylcerView to get notified whenever a ViewHolder is attached to or detached from RecyclerView. 
RecyclerView.OnFlingListener This class defines the behavior of fling if the developer wishes to handle it. 
RecyclerView.OnItemTouchListener An OnItemTouchListener allows the application to intercept touch events in progress at the view hierarchy level of the RecyclerView before those touch events are considered for RecyclerView's own scrolling behavior. 
RecyclerView.OnScrollListener An OnScrollListener can be added to a RecyclerView to receive messages when a scrolling event has occurred on that RecyclerView. 
RecyclerView.RecycledViewPool RecycledViewPool lets you share Views between multiple RecyclerViews. 
RecyclerView.Recycler A Recycler is responsible for managing scrapped or detached item views for reuse. 
RecyclerView.RecyclerListener A RecyclerListener can be set on a RecyclerView to receive messages whenever a view is recycled. 
RecyclerView.SimpleOnItemTouchListener An implementation of RecyclerView.OnItemTouchListener that has empty method bodies and default return values. 
RecyclerView.SmoothScroller

Base class for smooth scrolling. 

RecyclerView.SmoothScroller.Action Holds information about a smooth scroll request by a RecyclerView.SmoothScroller
RecyclerView.SmoothScroller.ScrollVectorProvider An interface which is optionally implemented by custom RecyclerView.LayoutManager to provide a hint to a RecyclerView.SmoothScroller about the location of the target position. 
RecyclerView.State

Contains useful information about the current RecyclerView state like target scroll position or view focus. 

RecyclerView.ViewCacheExtension ViewCacheExtension is a helper class to provide an additional layer of view caching that can be controlled by the developer. 
RecyclerView.ViewHolder A ViewHolder describes an item view and metadata about its place within the RecyclerView. 
RecyclerViewAccessibilityDelegate The AccessibilityDelegate used by RecyclerView. 
RecyclerViewAccessibilityDelegate.ItemDelegate The default implementation of accessibility delegate for the individual items of the RecyclerView. 
RecyclerViewParallax Implementation of Parallax class for RecyclerView
RecyclerViewParallax.ChildPositionProperty Subclass of Parallax.IntProperty
RemoteInput Helper for using the RemoteInput
RemoteInput.Builder Builder class for RemoteInput objects. 
RemotePlaybackClient A helper class for playing media on remote routes using the remote playback protocol defined by MediaControlIntent
RemotePlaybackClient.ActionCallback Base callback type for remote playback requests. 
RemotePlaybackClient.ItemActionCallback Callback for remote playback requests that operate on items. 
RemotePlaybackClient.OnMessageReceivedListener A callback that will receive messages from media sessions. 
RemotePlaybackClient.SessionActionCallback Callback for remote playback requests that operate on sessions. 
RemotePlaybackClient.StatusCallback A callback that will receive media status updates. 
RequiresApi Denotes that the annotated element should only be called on the given API level or higher. 
RequiresPermission Denotes that the annotated element requires (or may require) one or more permissions. 
RequiresPermission.Read Specifies that the given permission is required for read operations. 
RequiresPermission.Write Specifies that the given permission is required for write operations. 
ResourceCursorAdapter Static library support version of the framework's ResourceCursorAdapter
ResourcesCompat Helper for accessing features in Resources
ResourcesCompat.FontCallback Interface used to receive asynchronous font fetching events. 
RestrictTo Denotes that the annotated element should only be accessed from within a specific scope (as defined by RestrictTo.Scope). 
RestrictTo.Scope  
RoundedBitmapDrawable A Drawable that wraps a bitmap and can be drawn with rounded corners. 
RoundedBitmapDrawableFactory Constructs RoundedBitmapDrawable objects, either from Bitmaps directly, or from streams and files. 
RoundedDrawable Maintains and draws a drawable inside rounded rectangular bounds. 
Row The base class for all rows. 
RowHeaderPresenter RowHeaderPresenter provides a default presentation for HeaderItem using a RowHeaderView and optionally a TextView for description. 
RowHeaderPresenter.ViewHolder A ViewHolder for the RowHeaderPresenter. 
RowHeaderView RowHeaderView is a header text view. 
RowPresenter An abstract Presenter that renders an Object in RowsFragment, the object can be subclass Row or a generic one. 
RowPresenter.ViewHolder A ViewHolder for a Row
RowsFragment An ordered set of rows of leanback widgets. 
RowsFragment.MainFragmentAdapter  
RowsFragment.MainFragmentRowsAdapter The adapter that RowsFragment implements BrowseFragment.MainFragmentRowsAdapter. 
RowsSupportFragment An ordered set of rows of leanback widgets. 
RowsSupportFragment.MainFragmentAdapter  
RowsSupportFragment.MainFragmentRowsAdapter The adapter that RowsSupportFragment implements BrowseSupportFragment.MainFragmentRowsAdapter. 

S

ScaleGestureDetectorCompat Helper for accessing features in ScaleGestureDetector
Scene A scene represents the collection of values that various properties in the View hierarchy will have when the scene is applied. 
ScrollerCompat This class was deprecated in API level 26.1.0. Use OverScroller directly.  
ScrollingView An interface that can be implemented by Views to provide scroll related APIs. 
SearchBar A search widget containing a search orb and a text entry view. 
SearchBar.SearchBarListener Interface for receiving notification of search query changes. 
SearchBar.SearchBarPermissionListener Interface that handles runtime permissions requests. 
SearchEditText EditText widget that monitors keyboard changes. 
SearchEditText.OnKeyboardDismissListener Interface for receiving notification when the keyboard is dismissed. 
SearchFragment A fragment to handle searches. 
SearchFragment.SearchResultProvider Search API to be provided by the application. 
SearchOrbView

A widget that draws a search affordance, represented by a round background and an icon. 

SearchOrbView.Colors A set of colors used to display the search orb. 
SearchSupportFragment A fragment to handle searches. 
SearchSupportFragment.SearchResultProvider Search API to be provided by the application. 
SearchView A widget that provides a user interface for the user to enter a search query and submit a request to a search provider. 
SearchView.OnCloseListener  
SearchView.OnQueryTextListener Callbacks for changes to the query text. 
SearchView.OnSuggestionListener Callback interface for selection events on suggestions. 
SectionRow Used to represent section item in HeadersFragment. 
SeekBarPreference Preference based on android.preference.SeekBarPreference but uses support v7 preference as base. 
ServiceCompat Helper for accessing features in Service
Settings Provides various preferences affecting Leanback runtime behavior. 
ShadowOverlayContainer Provides an SDK version-independent wrapper to support shadows, color overlays, and rounded corners. 
ShadowOverlayHelper ShadowOverlayHelper is a helper class for shadow, overlay color and rounded corner. 
ShadowOverlayHelper.Builder Builder for creating ShadowOverlayHelper. 
ShadowOverlayHelper.Options Option values for ShadowOverlayContainer. 
ShareActionProvider Provides a share action, which is suitable for an activity's app bar. 
ShareActionProvider.OnShareTargetSelectedListener Listener for the event of selecting a share target. 
ShareCompat Extra helper functionality for sharing data between activities. 
ShareCompat.IntentBuilder IntentBuilder is a helper for constructing ACTION_SEND and ACTION_SEND_MULTIPLE sharing intents and starting activities to share content. 
ShareCompat.IntentReader IntentReader is a helper for reading the data contained within a sharing (ACTION_SEND) Intent. 
SharedElementCallback Listener provided in setEnterSharedElementCallback(SharedElementCallback) and setExitSharedElementCallback(SharedElementCallback) to monitor the Activity transitions. 
SharedElementCallback.OnSharedElementsReadyListener Listener to be called after onSharedElementsArrived(List, List, OnSharedElementsReadyListener) when the shared elements are ready to be hidden in the source Activity and shown in the destination Activity. 
SharedPreferencesCompat This class was deprecated in API level 27.0.0. This compatibility class is no longer required. Use SharedPreferences directly.  
SharedPreferencesCompat.EditorCompat This class was deprecated in API level 27.0.0. This compatibility class is no longer required. Use SharedPreferences.Editor directly.  
ShortcutInfoCompat Helper for accessing features in ShortcutInfo
ShortcutInfoCompat.Builder Builder class for ShortcutInfoCompat objects. 
ShortcutManagerCompat Helper for accessing features in ShortcutManager
SidePropagation A TransitionPropagation that propagates based on the distance to the side and, orthogonally, the distance to epicenter. 
SimpleArrayMap<K, V> Base implementation of ArrayMap that doesn't include any standard Java container API interoperability. 
SimpleCursorAdapter Static library support version of the framework's SimpleCursorAdapter
SimpleCursorAdapter.CursorToStringConverter This class can be used by external clients of SimpleCursorAdapter to define how the Cursor should be converted to a String. 
SimpleCursorAdapter.ViewBinder This class can be used by external clients of SimpleCursorAdapter to bind values fom the Cursor to views. 
SimpleItemAnimator A wrapper class for ItemAnimator that records View bounds and decides whether it should run move, change, add or remove animations. 
SinglePresenterSelector A PresenterSelector that always returns the same Presenter
Size Denotes that the annotated element should have a given size or length. 
Slide This transition tracks changes to the visibility of target views in the start and end scenes and moves views in or out from one of the edges of the scene. 
SlidingPaneLayout SlidingPaneLayout provides a horizontal, multi-pane layout for use at the top level of a UI. 
SlidingPaneLayout.LayoutParams  
SlidingPaneLayout.PanelSlideListener Listener for monitoring events about sliding panes. 
SlidingPaneLayout.SimplePanelSlideListener No-op stubs for SlidingPaneLayout.PanelSlideListener
Snackbar Snackbars provide lightweight feedback about an operation. 
Snackbar.Callback Callback class for Snackbar instances. 
SnapHelper Class intended to support snapping for a RecyclerView
SortedList<T> A Sorted list implementation that can keep items in order and also notify for changes in the list such that it can be bound to a RecyclerView.Adapter
SortedList.BatchedCallback<T2> A callback implementation that can batch notify events dispatched by the SortedList. 
SortedList.Callback<T2> The class that controls the behavior of the SortedList
SortedListAdapterCallback<T2> A SortedList.Callback implementation that can bind a SortedList to a RecyclerView.Adapter
Space Space is a lightweight View subclass that may be used to create gaps between components in general purpose layouts. 
SparseArrayCompat<E> A copy of the current platform (currently KITKAT version of SparseArray; provides a removeAt() method and other things. 
SparseArrayObjectAdapter An ObjectAdapter implemented with a SparseArray
SpeechOrbView A subclass of SearchOrbView that visualizes the state of an ongoing speech recognition. 
SpeechRecognitionCallback This interface was deprecated in API level 27.0.0. Launching voice recognition activity is no longer supported. App should declare android.permission.RECORD_AUDIO in AndroidManifest file. See details in SearchSupportFragment.  
SpringAnimation SpringAnimation is an animation that is driven by a SpringForce
SpringForce Spring Force defines the characteristics of the spring being used in the animation. 
StaggeredGridLayoutManager A LayoutManager that lays out children in a staggered grid formation. 
StaggeredGridLayoutManager.LayoutParams LayoutParams used by StaggeredGridLayoutManager. 
StringDef Denotes that the annotated String element, represents a logical type and that its value should be one of the explicitly named constants. 
StringRes Denotes that an integer parameter, field or method return value is expected to be a String resource reference (e.g. 
StyleableRes Denotes that an integer parameter, field or method return value is expected to be a styleable resource reference (e.g. 
StyleRes Denotes that an integer parameter, field or method return value is expected to be a style resource reference (e.g. 
SurfaceHolderGlueHost Optional interface to be implemented by any subclass of PlaybackGlueHost that contains a SurfaceView
SwipeDismissBehavior<V extends View> An interaction behavior plugin for child views of CoordinatorLayout to provide support for the 'swipe-to-dismiss' gesture. 
SwipeDismissBehavior.OnDismissListener Callback interface used to notify the application that the view has been dismissed. 
SwipeDismissFrameLayout A layout enabling left-to-right swipe-to-dismiss, intended for use within an activity. 
SwipeDismissFrameLayout.Callback Implement this callback to act on particular stages of the dismissal. 
SwipeRefreshLayout The SwipeRefreshLayout should be used whenever the user can refresh the contents of a view via a vertical swipe gesture. 
SwipeRefreshLayout.OnChildScrollUpCallback Classes that wish to override canChildScrollUp() method behavior should implement this interface. 
SwipeRefreshLayout.OnRefreshListener Classes that wish to be notified when the swipe gesture correctly triggers a refresh should implement this interface. 
SwitchCompat SwitchCompat is a version of the Switch widget which on devices back to API v7. 
SwitchPreference A Preference that provides a two-state toggleable option. 
SwitchPreferenceCompat A Preference that provides a two-state toggleable option. 

T

TabItem TabItem is a special 'view' which allows you to declare tab items for a TabLayout within a layout. 
TabLayout TabLayout provides a horizontal layout to display tabs. 
TabLayout.OnTabSelectedListener Callback interface invoked when a tab's selection state changes. 
TabLayout.Tab A tab in this layout. 
TabLayout.TabLayoutOnPageChangeListener A ViewPager.OnPageChangeListener class which contains the necessary calls back to the provided TabLayout so that the tab position is kept in sync. 
TabLayout.ViewPagerOnTabSelectedListener A TabLayout.OnTabSelectedListener class which contains the necessary calls back to the provided ViewPager so that the tab position is kept in sync. 
Target A class which allows custom selection of colors in a Palette's generation. 
Target.Builder Builder class for generating custom Target instances. 
TaskStackBuilder Utility class for constructing synthetic back stacks for cross-task navigation on Android 3.0 and newer. 
TaskStackBuilder.SupportParentable  
TextDirectionHeuristicCompat Interface for objects that use a heuristic for guessing at the paragraph direction by examining text. 
TextDirectionHeuristicsCompat Some objects that implement TextDirectionHeuristic. 
TextInputEditText A special sub-class of EditText designed for use as a child of TextInputLayout
TextInputLayout Layout which wraps an EditText (or descendant) to show a floating label when the hint is hidden due to the user inputting text. 
TextUtilsCompat Backwards compatible version of TextUtils
TextViewCompat Helper for accessing features in TextView
ThemedSpinnerAdapter An extension of SpinnerAdapter that is capable of inflating drop-down views against a different theme than normal views. 
ThemedSpinnerAdapter.Helper A helper class which allows easy integration of ThemedSpinnerAdapter into existing SpinnerAdapters in a backwards compatible way. 
TimePicker TimePicker is a direct subclass of Picker
TintableBackgroundView Interface which allows a View to receive background tinting calls from ViewCompat when running on API v20 devices or lower. 
TintableCompoundButton Interface which allows a CompoundButton to receive tinting calls from CompoundButtonCompat when running on API v20 devices or lower. 
TitleHelper Helper for managing TitleView, including transitions and focus movement. 
TitleView Title view for a leanback fragment. 
TitleViewAdapter This class allows a customized widget class to implement TitleViewAdapter.Provider and expose TitleViewAdapter methods to containing fragment (e.g. 
TitleViewAdapter.Provider Interface to be implemented by a customized widget class to implement TitleViewAdapter
Toolbar A standard toolbar for use within application content. 
Toolbar.LayoutParams Layout information for child views of Toolbars. 
Toolbar.OnMenuItemClickListener Interface responsible for receiving menu item click events if the items themselves do not have individual item click listeners. 
Toolbar.SavedState  
TooltipCompat Helper class used to emulate the behavior of setTooltipText(CharSequence) prior to API level 26. 
TraceCompat Writes trace events to the system trace buffer. 
TrafficStatsCompat Helper for accessing features in TrafficStats
Transition A Transition holds information about animations that will be run on its targets during a scene change. 
Transition.EpicenterCallback Class to get the epicenter of Transition. 
Transition.TransitionListener A transition listener receives notifications from a transition. 
TransitionInflater This class inflates scenes and transitions from resource files. 
TransitionListenerAdapter This adapter class provides empty implementations of the methods from Transition.TransitionListener
TransitionManager This class manages the set of transitions that fire when there is a change of Scene
TransitionPropagation Extend TransitionPropagation to customize start delays for Animators created in createAnimator(ViewGroup, TransitionValues, TransitionValues)
TransitionRes Denotes that an integer parameter, field or method return value is expected to be a transition resource reference. 
TransitionSet A TransitionSet is a parent of child transitions (including other TransitionSets). 
TransitionValues Data structure which holds cached values for the transition. 
TrustedWebUtils Class for utilities and convenience calls for opening a qualifying web page as a Trusted Web Activity. 
TvContractCompat The contract between the TV provider and applications. 
TvContractCompat.BaseTvColumns Common base for the tables of TV channels/programs. 
TvContractCompat.Channels Column definitions for the TV channels table. 
TvContractCompat.Channels.Logo A sub-directory of a single TV channel that represents its primary logo. 
TvContractCompat.PreviewPrograms Column definitions for the preview TV programs table. 
TvContractCompat.Programs Column definitions for the TV programs table. 
TvContractCompat.Programs.Genres Canonical genres for TV programs. 
TvContractCompat.RecordedPrograms Column definitions for the recorded TV programs table. 
TvContractCompat.WatchNextPrograms Column definitions for the "watch next" TV programs table. 
TwoStatePreference Common base class for preferences that have two selectable states, persist a boolean value in SharedPreferences, and may have dependent preferences that are enabled/disabled based on the current state. 

U

UiThread Denotes that the annotated method or constructor should only be called on the UI thread. 
UserManagerCompat Helper for accessing features in UserManager in a backwards compatible fashion. 

V

VectorDrawableCompat For API 24 and above, this class is delegating to the framework's VectorDrawable
VelocityTrackerCompat This class was deprecated in API level 26.1.0. Use VelocityTracker directly.  
VerticalGridFragment A fragment for creating leanback vertical grids. 
VerticalGridPresenter A presenter that renders objects in a VerticalGridView
VerticalGridPresenter.ViewHolder ViewHolder for the VerticalGridPresenter. 
VerticalGridSupportFragment A fragment for creating leanback vertical grids. 
VerticalGridView A ViewGroup that shows items in a vertically scrolling list. 
VideoFragment Subclass of PlaybackFragment that is responsible for providing a SurfaceView and rendering video. 
VideoFragmentGlueHost PlaybackGlueHost implementation the interaction between PlaybackGlue and VideoFragment
VideoSupportFragment Subclass of PlaybackSupportFragment that is responsible for providing a SurfaceView and rendering video. 
VideoSupportFragmentGlueHost PlaybackGlueHost implementation the interaction between PlaybackGlue and VideoSupportFragment
ViewCompat This class was deprecated in API level 26.1.0. Use ViewCompat instead.  
ViewCompat Helper for accessing features in View
ViewConfigurationCompat This class was deprecated in API level 26.1.0. Use ViewConfiguration directly.  
ViewDragHelper ViewDragHelper is a utility class for writing custom ViewGroups. 
ViewDragHelper.Callback A Callback is used as a communication channel with the ViewDragHelper back to the parent view using it. 
ViewGroupCompat Helper for accessing features in ViewGroup
ViewHolderTask Interface for schedule task on a ViewHolder. 
ViewPager Layout manager that allows the user to flip left and right through pages of data. 
ViewPager.DecorView Annotation which allows marking of views to be decoration views when added to a view pager. 
ViewPager.LayoutParams Layout parameters that should be supplied for views added to a ViewPager. 
ViewPager.OnAdapterChangeListener Callback interface for responding to adapter changes. 
ViewPager.OnPageChangeListener Callback interface for responding to changing state of the selected page. 
ViewPager.PageTransformer A PageTransformer is invoked whenever a visible/attached page is scrolled. 
ViewPager.SavedState This is the persistent state that is saved by ViewPager. 
ViewPager.SimpleOnPageChangeListener Simple implementation of the ViewPager.OnPageChangeListener interface with stub implementations of each method. 
ViewParentCompat Helper for accessing features in ViewParent
ViewPropertyAnimatorCompat  
ViewPropertyAnimatorListener

An animation listener receives notifications from an animation. 

ViewPropertyAnimatorListenerAdapter This adapter class provides empty implementations of the methods from ViewPropertyAnimatorListener
ViewPropertyAnimatorUpdateListener Implementors of this interface can add themselves as update listeners to an ViewPropertyAnimatorCompat instance to receive callbacks on every animation frame, after the current frame's values have been calculated for that ViewPropertyAnimatorCompat
Visibility This transition tracks changes to the visibility of target views in the start and end scenes. 
VisibilityPropagation Base class for TransitionPropagations that care about View Visibility and the center position of the View. 
VisibleForTesting Denotes that the class, method or field has its visibility relaxed, so that it is more widely visible than otherwise necessary to make code testable. 
VolumeProviderCompat Handles requests to adjust or set the volume on a session. 
VolumeProviderCompat.Callback Listens for changes to the volume. 

W

WakefulBroadcastReceiver This class was deprecated in API level 26.1.0. As of Android O, background check restrictions make this class no longer generally useful. (It is generally not safe to start a service from the receipt of a broadcast, because you don't have any guarantees that your app is in the foreground at this point and thus allowed to do so.) Instead, developers should use android.app.job.JobScheduler to schedule a job, and this does not require that the app hold a wake lock while doing so (the system will take care of holding a wake lock for the job).  
WatchNextProgram A convenience class to access TvContractCompat.WatchNextPrograms entries in the system content provider. 
WatchNextProgram.Builder This Builder class simplifies the creation of a WatchNextProgram object. 
WearableActionDrawerView Ease of use class for creating a Wearable action drawer. 
WearableDrawerController Provides the ability to manipulate a WearableDrawerView's position within a WearableDrawerLayout
WearableDrawerLayout Top-level container that allows interactive drawers to be pulled from the top and bottom edge of the window. 
WearableDrawerLayout.DrawerStateCallback Listener for monitoring events about drawers. 
WearableDrawerView View that contains drawer content and a peeking view for use with WearableDrawerLayout
WearableLinearLayoutManager This wear-specific implementation of LinearLayoutManager provides basic offsetting logic for updating child layout. 
WearableLinearLayoutManager.LayoutCallback Callback for interacting with layout passes. 
WearableNavigationDrawerView Ease of use class for creating a Wearable navigation drawer. 
WearableNavigationDrawerView.OnItemSelectedListener Listener which is notified when the user selects an item. 
WearableNavigationDrawerView.WearableNavigationDrawerAdapter Adapter for specifying the contents of WearableNavigationDrawer. 
WearableRecyclerView Wearable specific implementation of the RecyclerView enabling setCircularScrollingGestureEnabled(boolean) circular scrolling} and semi-circular layouts. 
WindowCompat Helper for accessing features in Window
WindowInsetsCompat Describes a set of insets for window content. 
WorkerThread Denotes that the annotated method should only be called on a worker thread. 

X

XmlRes Denotes that an integer parameter, field or method return value is expected to be an XML resource reference. 
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