PreferenceFragmentCompat


public abstract class PreferenceFragmentCompat extends Fragment implements PreferenceManager.OnPreferenceTreeClickListener, PreferenceManager.OnDisplayPreferenceDialogListener, PreferenceManager.OnNavigateToScreenListener, DialogPreference.TargetFragment

Known direct subclasses
BaseLeanbackPreferenceFragmentCompat

This fragment provides a preference fragment with leanback-style behavior, suitable for embedding into broader UI elements.

Known indirect subclasses
LeanbackPreferenceFragmentCompat

This fragment provides a fully decorated leanback-style preference fragment, including a list background and header.


A PreferenceFragmentCompat is the entry point to using the Preference library. This Fragment displays a hierarchy of Preference objects to the user. It also handles persisting values to the device. To retrieve an instance of android.content.SharedPreferences that the preference hierarchy in this fragment will use by default, call getDefaultSharedPreferences with a context in the same package as this fragment.

You can define a preference hierarchy as an XML resource, or you can build a hierarchy in code. In both cases you need to use a PreferenceScreen as the root component in your hierarchy.

To inflate from XML, use the setPreferencesFromResource. An example example XML resource is shown further down.

To build a hierarchy from code, use createPreferenceScreen to create the root PreferenceScreen. Once you have added other Preferences to this root screen with addPreference, you then need to set the screen as the root screen in your hierarchy with setPreferenceScreen.

As a convenience, this fragment implements a click listener for any preference in the current hierarchy, see onPreferenceTreeClick.

Sample Code

The following sample code shows a simple settings screen using an XML resource. The XML resource is as follows:

<PreferenceScreen
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto">

    <PreferenceCategory
            android:title="@string/basic_preferences">

        <Preference
                android:key="preference"
                android:title="@string/title_basic_preference"
                android:summary="@string/summary_basic_preference"/>

        <Preference
                android:key="stylized"
                android:title="@string/title_stylish_preference"
                android:summary="@string/summary_stylish_preference"/>

        <Preference
                android:key="icon"
                android:title="@string/title_icon_preference"
                android:summary="@string/summary_icon_preference"
                android:icon="@android:drawable/ic_menu_camera"/>

        <Preference
                android:key="single_line_title"
                android:title="@string/title_single_line_title_preference"
                android:summary="@string/summary_single_line_title_preference"
                app:singleLineTitle="true"/>
    </PreferenceCategory>

    <PreferenceCategory
            android:title="@string/widgets">

        <CheckBoxPreference
                android:key="checkbox"
                android:title="@string/title_checkbox_preference"
                android:summary="@string/summary_checkbox_preference"/>

        <SwitchPreferenceCompat
                android:key="switch"
                android:title="@string/title_switch_preference"
                android:summary="@string/summary_switch_preference"/>

        <DropDownPreference
                android:key="dropdown"
                android:title="@string/title_dropdown_preference"
                android:entries="@array/entries"
                app:useSimpleSummaryProvider="true"
                android:entryValues="@array/entry_values"/>

        <SeekBarPreference
                android:key="seekbar"
                android:title="@string/title_seekbar_preference"
                android:max="10"
                android:defaultValue="5"/>
    </PreferenceCategory>

    <PreferenceCategory
            android:title="@string/dialogs">

        <EditTextPreference
                android:key="edittext"
                android:title="@string/title_edittext_preference"
                app:useSimpleSummaryProvider="true"
                android:dialogTitle="@string/dialog_title_edittext_preference"/>

        <ListPreference
                android:key="list"
                android:title="@string/title_list_preference"
                app:useSimpleSummaryProvider="true"
                android:entries="@array/entries"
                android:entryValues="@array/entry_values"
                android:dialogTitle="@string/dialog_title_list_preference"/>

        <MultiSelectListPreference
                android:key="multi_select_list"
                android:title="@string/title_multi_list_preference"
                android:summary="@string/summary_multi_list_preference"
                android:entries="@array/entries"
                android:entryValues="@array/entry_values"
                android:dialogTitle="@string/dialog_title_multi_list_preference"/>
    </PreferenceCategory>

    <PreferenceCategory
            android:key="advanced"
            android:title="@string/advanced_attributes"
            app:initialExpandedChildrenCount="1">

        <Preference
                android:key="expandable"
                android:title="@string/title_expandable_preference"
                android:summary="@string/summary_expandable_preference"/>

        <Preference
                android:title="@string/title_intent_preference"
                android:summary="@string/summary_intent_preference">

            <intent android:action="android.intent.action.VIEW"
                    android:data="http://www.android.com"/>

        </Preference>

        <SwitchPreferenceCompat
                android:key="parent"
                android:title="@string/title_parent_preference"
                android:summary="@string/summary_parent_preference"/>

        <SwitchPreferenceCompat
                android:key="child"
                android:dependency="parent"
                android:title="@string/title_child_preference"
                android:summary="@string/summary_child_preference"/>

        <SwitchPreferenceCompat
                android:key="toggle_summary"
                android:title="@string/title_toggle_summary_preference"
                android:summaryOn="@string/summary_on_toggle_summary_preference"
                android:summaryOff="@string/summary_off_toggle_summary_preference"/>

        <Preference
                android:key="copyable"
                android:title="@string/title_copyable_preference"
                android:summary="@string/summary_copyable_preference"
                android:selectable="false"
                app:enableCopying="true"/>
    </PreferenceCategory>

</PreferenceScreen>

The fragment that loads the XML resource is as follows:

public static class DemoFragment extends PreferenceFragmentCompat {

    @Override
    public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
        // Load the preferences from an XML resource
        setPreferencesFromResource(R.xml.preferences, rootKey);
    }
}

Summary

Nested types

Interface that the fragment's containing activity should implement to be able to process preference items that wish to display a dialog.

Interface that the fragment's containing activity should implement to be able to process preference items that wish to switch to a specified fragment.

Interface that the fragment's containing activity should implement to be able to process preference items that wish to switch to a new screen of preferences.

Constants

static final String
ARG_PREFERENCE_ROOT = "androidx.preference.PreferenceFragmentCompat.PREFERENCE_ROOT"

Fragment argument used to specify the tag of the desired root PreferenceScreen object.

Public constructors

Public methods

void
addPreferencesFromResource(@XmlRes int preferencesResId)

Inflates the given XML resource and adds the preference hierarchy to the current preference hierarchy.

@Nullable T

Finds a Preference with the given key.

final RecyclerView
PreferenceManager

Returns the PreferenceManager used by this fragment.

PreferenceScreen

Gets the root of the preference hierarchy that this fragment is showing.

void
onCreate(@Nullable Bundle savedInstanceState)

Called to do initial creation of a fragment.

@NonNull RecyclerView.LayoutManager

Called from onCreateRecyclerView to create the RecyclerView.LayoutManager for the created RecyclerView.

abstract void
onCreatePreferences(
    @Nullable Bundle savedInstanceState,
    @Nullable String rootKey
)

Called during onCreate to supply the preferences for this fragment.

@NonNull RecyclerView
onCreateRecyclerView(
    @NonNull LayoutInflater inflater,
    @NonNull ViewGroup parent,
    @Nullable Bundle savedInstanceState
)

Creates the RecyclerView used to display the preferences.

@NonNull View
onCreateView(
    @NonNull LayoutInflater inflater,
    @Nullable ViewGroup container,
    @Nullable Bundle savedInstanceState
)

Called to have the fragment instantiate its user interface view.

void

Called when the view previously created by onCreateView has been detached from the fragment.

void

Called when a preference in the tree requests to display a dialog.

void

Called by onClick in order to navigate to a new screen of preferences.

boolean

Called when a preference in the tree rooted at this has been clicked.

void

Called to ask the fragment to save its current dynamic state, so it can later be reconstructed in a new instance if its process is restarted.

void

Called when the Fragment is visible to the user.

void

Called when the Fragment is no longer started.

void
onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState)

Called immediately after onCreateView has returned, but before any saved state has been restored in to the view.

void
void
void

Sets the Drawable that will be drawn between each item in the list.

void
setDividerHeight(int height)

Sets the height of the divider that will be drawn between each item in the list.

void

Sets the root of the preference hierarchy that this fragment is showing.

void
setPreferencesFromResource(
    @XmlRes int preferencesResId,
    @Nullable String key
)

Inflates the given XML resource and replaces the current preference hierarchy (if any) with the preference hierarchy rooted at key.

Protected methods

@NonNull RecyclerView.Adapter

Creates the root adapter.

Inherited methods

From androidx.activity.result.ActivityResultCaller
abstract ActivityResultLauncher<I>
<I, O> registerForActivityResult(
    ActivityResultContract<I, O> contract,
    ActivityResultCallback<O> callback
)

Register a request to start an activity for result, designated by the given contract.

From android.content.ComponentCallbacks
abstract void
abstract void

This method is deprecated.

From androidx.fragment.app.Fragment
void
dump(
    @NonNull String prefix,
    @Nullable FileDescriptor fd,
    @NonNull PrintWriter writer,
    @Nullable String[] args
)

Print the Fragments's state into the given stream.

final boolean

Subclasses can not override equals().

final @Nullable FragmentActivity

Return the FragmentActivity this fragment is currently associated with.

boolean

Returns whether the the exit transition and enter transition overlap or not.

boolean

Returns whether the the return transition and reenter transition overlap or not.

final @Nullable Bundle

Return the arguments supplied when the fragment was instantiated, if any.

final @NonNull FragmentManager

Return a private FragmentManager for placing and managing Fragments inside of this Fragment.

@Nullable Context

Return the Context this fragment is currently associated with.

@NonNull CreationExtras

The Fragment's arguments when this is first called will be used as the defaults to any androidx.lifecycle.SavedStateHandle passed to a view model created using this extra.

@NonNull ViewModelProvider.Factory
@Nullable Object

Returns the Transition that will be used to move Views into the initial scene.

@Nullable Object

Returns the Transition that will be used to move Views out of the scene when the fragment is removed, hidden, or detached when not popping the back stack.

final @Nullable FragmentManager

This method is deprecated.

This has been removed in favor of getParentFragmentManager() which throws an IllegalStateException if the FragmentManager is null.

final @Nullable Object

Return the host object of this fragment.

final int

Return the identifier this fragment is known by.

final @NonNull LayoutInflater

Returns the cached LayoutInflater used to inflate Views of this Fragment.

@NonNull Lifecycle

Overriding this method is no longer supported and this method will be made final in a future version of Fragment.

@NonNull LoaderManager

This method is deprecated.

Use LoaderManager.getInstance(this).

final @Nullable Fragment

Returns the parent Fragment containing this Fragment.

final @NonNull FragmentManager

Return the FragmentManager for interacting with fragments associated with this fragment's activity.

@Nullable Object

Returns the Transition that will be used to move Views in to the scene when returning due to popping a back stack.

final @NonNull Resources

Return requireActivity().getResources().

final boolean

This method is deprecated.

Instead of retaining the Fragment itself, use a non-retained Fragment and keep retained state in a ViewModel attached to that Fragment.

@Nullable Object

Returns the Transition that will be used to move Views out of the scene when the Fragment is preparing to be removed, hidden, or detached because of popping the back stack.

final @NonNull SavedStateRegistry
@Nullable Object

Returns the Transition that will be used for shared elements transferred into the content Scene.

@Nullable Object

Return the Transition that will be used for shared elements transferred back during a pop of the back stack.

final @NonNull String
getString(@StringRes int resId)

Return a localized string from the application's package's default string table.

final @NonNull String
getString(@StringRes int resId, @Nullable Object[] formatArgs)

Return a localized formatted string from the application's package's default string table, substituting the format arguments as defined in java.util.Formatter and format.

final @Nullable String

Get the tag name of the fragment, if specified.

final @Nullable Fragment

This method is deprecated.

Instead of using a target fragment to pass results, use setFragmentResult to deliver results to FragmentResultListener instances registered by other fragments via setFragmentResultListener.

final int

This method is deprecated.

When using the target fragment replacement of setFragmentResultListener and setFragmentResult, consider using setArguments to pass a requestKey if you need to support dynamic request keys.

final @NonNull CharSequence
getText(@StringRes int resId)

Return a localized, styled CharSequence from the application's package's default string table.

boolean

This method is deprecated.

Use setMaxLifecycle instead.

@Nullable View

Get the root view for the fragment's layout (the one returned by onCreateView), if provided.