Android APIs
Added in API level 1
package

android.view

Provides classes that expose basic user interface classes that handle screen layout and interaction with the user.

Interfaces

ActionMode.Callback Callback interface for action modes. 
ActionProvider.VisibilityListener Listens to changes in visibility as reported by refreshVisibility()
Choreographer.FrameCallback Implement this interface to receive a callback when a new display frame is being rendered. 
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 MenuItem.OnActionExpandListener
ContextMenu Extension of Menu for context menus providing functionality to modify the header of the context menu. 
ContextMenu.ContextMenuInfo Additional information regarding the creation of the context menu. 
GestureDetector.OnDoubleTapListener The listener that is used to notify when a double-tap or a confirmed single-tap occur. 
GestureDetector.OnGestureListener The listener that is used to notify when gestures occur. 
InputQueue.Callback Interface to receive notification of when an InputQueue is associated and dissociated with a thread. 
KeyEvent.Callback  
LayoutInflater.Factory  
LayoutInflater.Factory2  
LayoutInflater.Filter Hook to allow clients of the LayoutInflater to restrict the set of Views that are allowed to be inflated. 
Menu Interface for managing the items in a menu. 
MenuItem Interface for direct access to a previously created menu item. 
MenuItem.OnActionExpandListener Interface definition for a callback to be invoked when a menu item marked with SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW is expanded or collapsed. 
MenuItem.OnMenuItemClickListener Interface definition for a callback to be invoked when a menu item is clicked. 
ScaleGestureDetector.OnScaleGestureListener The listener for receiving notifications when gestures occur. 
SubMenu Subclass of Menu for sub menus. 
SurfaceHolder Abstract interface to someone holding a display surface. 
SurfaceHolder.Callback A client may implement this interface to receive information about changes to the surface. 
SurfaceHolder.Callback2 Additional callbacks that can be received for SurfaceHolder.Callback
TextureView.SurfaceTextureListener This listener can be used to be notified when the surface texture associated with this texture view is available. 
View.OnApplyWindowInsetsListener Listener for applying window insets on a view in a custom way. 
View.OnAttachStateChangeListener Interface definition for a callback to be invoked when this view is attached or detached from its window. 
View.OnClickListener Interface definition for a callback to be invoked when a view is clicked. 
View.OnCreateContextMenuListener Interface definition for a callback to be invoked when the context menu for this view is being built. 
View.OnDragListener Interface definition for a callback to be invoked when a drag is being dispatched to this view. 
View.OnFocusChangeListener Interface definition for a callback to be invoked when the focus state of a view changed. 
View.OnGenericMotionListener Interface definition for a callback to be invoked when a generic motion event is dispatched to this view. 
View.OnHoverListener Interface definition for a callback to be invoked when a hover event is dispatched to this view. 
View.OnKeyListener Interface definition for a callback to be invoked when a hardware key event is dispatched to this view. 
View.OnLayoutChangeListener Interface definition for a callback to be invoked when the layout bounds of a view changes due to layout processing. 
View.OnLongClickListener Interface definition for a callback to be invoked when a view has been clicked and held. 
View.OnSystemUiVisibilityChangeListener Interface definition for a callback to be invoked when the status bar changes visibility. 
View.OnTouchListener Interface definition for a callback to be invoked when a touch event is dispatched to this view. 
ViewGroup.OnHierarchyChangeListener Interface definition for a callback to be invoked when the hierarchy within this view changed. 
ViewManager Interface to let you add and remove child views to an Activity. 
ViewParent Defines the responsibilities for a class that will be a parent of a View. 
ViewStub.OnInflateListener Listener used to receive a notification after a ViewStub has successfully inflated its layout resource. 
ViewTreeObserver.OnDrawListener Interface definition for a callback to be invoked when the view tree is about to be drawn. 
ViewTreeObserver.OnGlobalFocusChangeListener Interface definition for a callback to be invoked when the focus state within the view tree changes. 
ViewTreeObserver.OnGlobalLayoutListener Interface definition for a callback to be invoked when the global layout state or the visibility of views within the view tree changes. 
ViewTreeObserver.OnPreDrawListener Interface definition for a callback to be invoked when the view tree is about to be drawn. 
ViewTreeObserver.OnScrollChangedListener Interface definition for a callback to be invoked when something in the view tree has been scrolled. 
ViewTreeObserver.OnTouchModeChangeListener Interface definition for a callback to be invoked when the touch mode changes. 
ViewTreeObserver.OnWindowAttachListener Interface definition for a callback to be invoked when the view hierarchy is attached to and detached from its window. 
ViewTreeObserver.OnWindowFocusChangeListener Interface definition for a callback to be invoked when the view hierarchy's window focus state changes. 
Window.Callback API from a Window back to its caller. 
WindowManager The interface that apps use to talk to the window manager. 

Classes

AbsSavedState A Parcelable implementation that should be used by inheritance hierarchies to ensure the state of all classes along the chain is saved. 
ActionMode Represents a contextual mode of the user interface. 
ActionProvider An ActionProvider defines rich menu interaction in a single component. 
Choreographer Coordinates the timing of animations, input and drawing. 
ContextThemeWrapper A ContextWrapper that allows you to modify the theme from what is in the wrapped context. 
Display Provides information about the size and density of a logical display. 
DragEvent Represents an event that is sent out by the system at various times during a drag and drop operation. 
FocusFinder The algorithm used for finding the next focusable view in a given direction from a view that currently has focus. 
GestureDetector Detects various gestures and events using the supplied MotionEvents. 
GestureDetector.SimpleOnGestureListener A convenience class to extend when you only want to listen for a subset of all the gestures. 
Gravity Standard constants and tools for placing an object within a potentially larger container. 
HapticFeedbackConstants Constants to be used to perform haptic feedback effects via performHapticFeedback(int)  
InputDevice Describes the capabilities of a particular input device. 
InputDevice.MotionRange Provides information about the range of values for a particular MotionEvent axis. 
InputEvent Common base class for input events. 
InputQueue An input queue provides a mechanism for an application to receive incoming input events. 
KeyCharacterMap Describes the keys provided by a keyboard device and their associated labels. 
KeyCharacterMap.KeyData This class was deprecated in API level 11. instead use getDisplayLabel(int), getNumber(int) and get(int, int).  
KeyEvent Object used to report key and button events. 
KeyEvent.DispatcherState Use with dispatch(Callback, DispatcherState, Object) for more advanced key dispatching, such as long presses. 
LayoutInflater Instantiates a layout XML file into its corresponding View objects. 
MenuInflater This class is used to instantiate menu XML files into Menu objects. 
MotionEvent Object used to report movement (mouse, pen, finger, trackball) events. 
MotionEvent.PointerCoords Transfer object for pointer coordinates. 
MotionEvent.PointerProperties Transfer object for pointer properties. 
OrientationEventListener Helper class for receiving notifications from the SensorManager when the orientation of the device has changed. 
OrientationListener This class was deprecated in API level 3. use OrientationEventListener instead. This class internally uses the OrientationEventListener.  
ScaleGestureDetector Detects scaling transformation gestures using the supplied MotionEvents. 
ScaleGestureDetector.SimpleOnScaleGestureListener A convenience class to extend when you only want to listen for a subset of scaling-related events. 
SoundEffectConstants Constants to be used to play sound effects via playSoundEffect(int)  
Surface Handle onto a raw buffer that is being managed by the screen compositor. 
SurfaceView Provides a dedicated drawing surface embedded inside of a view hierarchy. 
TextureView

A TextureView can be used to display a content stream. 

TouchDelegate Helper class to handle situations where you want a view to have a larger touch area than its actual view bounds. 
VelocityTracker Helper for tracking the velocity of touch events, for implementing flinging and other such gestures. 
View

This class represents the basic building block for user interface components. 

View.AccessibilityDelegate

This class represents a delegate that can be registered in a View to enhance accessibility support via composition rather via inheritance. 

View.BaseSavedState Base class for derived classes that want to save and restore their own state in onSaveInstanceState()
View.DragShadowBuilder Creates an image that the system displays during the drag and drop operation. 
View.MeasureSpec A MeasureSpec encapsulates the layout requirements passed from parent to child. 
ViewConfiguration Contains methods to standard constants used in the UI for timeouts, sizes, and distances. 
ViewDebug Various debugging/tracing tools related to View and the view hierarchy. 
ViewGroup

A ViewGroup is a special view that can contain other views (called children.) The view group is the base class for layouts and views containers. 

ViewGroup.LayoutParams LayoutParams are used by views to tell their parents how they want to be laid out. 
ViewGroup.MarginLayoutParams Per-child layout information for layouts that support margins. 
ViewGroupOverlay A group overlay is an extra layer that sits on top of a ViewGroup (the "host view") which is drawn after all other content in that view (including the view group's children). 
ViewOverlay An overlay is an extra layer that sits on top of a View (the "host view") which is drawn after all other content in that view (including children, if the view is a ViewGroup). 
ViewPropertyAnimator This class enables automatic and optimized animation of select properties on View objects. 
ViewStub A ViewStub is an invisible, zero-sized View that can be used to lazily inflate layout resources at runtime. 
ViewTreeObserver A view tree observer is used to register listeners that can be notified of global changes in the view tree. 
Window Abstract base class for a top-level window look and behavior policy. 
WindowId Safe identifier for a window. 
WindowId.FocusObserver Subclass for observing changes to the focus state of an WindowId
WindowInsets Describes a set of insets for window content. 
WindowManager.LayoutParams  

Enums

ViewDebug.HierarchyTraceType This enum was deprecated in API level 16. This enum is now unused  
ViewDebug.RecyclerTraceType This enum was deprecated in API level 16. This enum is now unused  

Exceptions

InflateException This exception is thrown by an inflater on error conditions. 
KeyCharacterMap.UnavailableException Thrown by load(int) when a key character map could not be loaded. 
Surface.OutOfResourcesException Exception thrown when a Canvas couldn't be locked with lockCanvas(Rect), or when a SurfaceTexture could not successfully be allocated. 
SurfaceHolder.BadSurfaceTypeException Exception that is thrown from lockCanvas() when called on a Surface whose type is SURFACE_TYPE_PUSH_BUFFERS. 
WindowManager.BadTokenException Exception that is thrown when trying to add view whose WindowManager.LayoutParams token is invalid. 
WindowManager.InvalidDisplayException Exception that is thrown when calling addView(View, ViewGroup.LayoutParams) to a secondary display that cannot be found.