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PreferenceFragment

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

java.lang.Object
   ↳ android.app.Fragment
     ↳ android.support.v14.preference.PreferenceFragment
Known Direct Subclasses
Known Indirect Subclasses


Shows a hierarchy of Preference objects as lists. These preferences will automatically save to SharedPreferences as the user interacts with them. To retrieve an instance of SharedPreferences that the preference hierarchy in this fragment will use, call getDefaultSharedPreferences(android.content.Context) with a context in the same package as this fragment.

Furthermore, the preferences shown will follow the visual style of system preferences. It is easy to create a hierarchy of preferences (that can be shown on multiple screens) via XML. For these reasons, it is recommended to use this fragment (as a superclass) to deal with preferences in applications.

A PreferenceScreen object should be at the top of the preference hierarchy. Furthermore, subsequent PreferenceScreen in the hierarchy denote a screen break--that is the preferences contained within subsequent PreferenceScreen should be shown on another screen. The preference framework handles this by calling onNavigateToScreen(PreferenceScreen).

The preference hierarchy can be formed in multiple ways:

  • From an XML file specifying the hierarchy
  • From different Activities that each specify its own preferences in an XML file via Activity meta-data
  • From an object hierarchy rooted with PreferenceScreen

    To inflate from XML, use the addPreferencesFromResource(int). The root element should be a PreferenceScreen. Subsequent elements can point to actual Preference subclasses. As mentioned above, subsequent PreferenceScreen in the hierarchy will result in the screen break.

    To specify an object hierarchy rooted with PreferenceScreen, use setPreferenceScreen(PreferenceScreen).

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

    Developer Guides

    For information about using PreferenceFragment, read the Settings guide.

    Sample Code

    The following sample code shows a simple preference fragment that is populated from a resource. The resource it loads is:

    <PreferenceScreen
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:title="@string/root_title">
    
        <Preference
            android:key="basic_preference"
            android:title="@string/title_basic_preference"
            android:summary="@string/summary_basic_preference" />
    
        <Preference
            android:key="stylish_preference"
            android:title="@string/title_stylish_preference"
            android:summary="@string/summary_stylish_preference" />
    
        <PreferenceCategory
            android:title="@string/inline_preferences">
    
            <CheckBoxPreference
                android:key="checkbox_preference"
                android:title="@string/title_checkbox_preference"
                android:summary="@string/summary_checkbox_preference" />
    
            <DropDownPreference
                android:key="dropdown_preference"
                android:title="@string/title_dropdown_preference"
                android:summary="@string/summary_dropdown_preference"
                android:entries="@array/entries_list_preference"
                android:entryValues="@array/entryvalues_list_preference" />
    
        </PreferenceCategory>
    
        <PreferenceCategory
            android:title="@string/dialog_based_preferences">
    
            <EditTextPreference
                android:key="edittext_preference"
                android:title="@string/title_edittext_preference"
                android:summary="@string/summary_edittext_preference"
                android:dialogTitle="@string/dialog_title_edittext_preference" />
    
            <ListPreference
                android:key="list_preference"
                android:title="@string/title_list_preference"
                android:summary="@string/summary_list_preference"
                android:entries="@array/entries_list_preference"
                android:entryValues="@array/entryvalues_list_preference"
                android:dialogTitle="@string/dialog_title_list_preference" />
    
            <MultiSelectListPreference
                android:key="multi_select_list_preference"
                android:title="@string/title_multi_list_preference"
                android:summary="@string/summary_multi_list_preference"
                android:entries="@array/entries_list_preference"
                android:entryValues="@array/entryvalues_list_preference"
                android:dialogTitle="@string/dialog_title_multi_list_preference" />
    
        </PreferenceCategory>
    
        <PreferenceCategory
            android:title="@string/launch_preferences">
    
            <!-- This PreferenceScreen tag serves as a screen break (similar to page break
                 in word processing). Like for other preference types, we assign a key
                 here so it is able to save and restore its instance state. -->
            <PreferenceScreen
                android:key="screen_preference"
                android:title="@string/title_screen_preference"
                android:summary="@string/summary_screen_preference">
    
                <!-- You can place more preferences here that will be shown on the next screen. -->
    
                <CheckBoxPreference
                    android:key="next_screen_checkbox_preference"
                    android:title="@string/title_next_screen_toggle_preference"
                    android:summary="@string/summary_next_screen_toggle_preference" />
    
            </PreferenceScreen>
    
            <PreferenceScreen
                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" />
    
            </PreferenceScreen>
    
        </PreferenceCategory>
    
        <PreferenceCategory
            android:title="@string/preference_attributes">
    
            <CheckBoxPreference
                android:key="parent_checkbox_preference"
                android:title="@string/title_parent_preference"
                android:summary="@string/summary_parent_preference" />
    
            <!-- The visual style of a child is defined by this styled theme attribute. -->
            <CheckBoxPreference
                android:key="child_checkbox_preference"
                android:dependency="parent_checkbox_preference"
                android:layout="?android:attr/preferenceLayoutChild"
                android:title="@string/title_child_preference"
                android:summary="@string/summary_child_preference" />
    
        </PreferenceCategory>
    
    </PreferenceScreen>

    The fragment implementation itself simply populates the preferences when created. Note that the preferences framework takes care of loading the current values out of the app preferences and writing them when changed:

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

    See also:

    Summary

    Nested classes

    interface PreferenceFragment.OnPreferenceDisplayDialogCallback

     

    interface 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. 

    interface 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. 

    XML attributes

    android:divider List separator to draw between preference views

    May be a reference to another resource, in the form "@[+][package:]type/name" or a theme attribute in the form "?[package:]type/name". 

    android:dividerHeight List separator height

    May be a dimension value, which is a floating point number appended with a unit such as "14.5sp". 

    Inherited XML attributes

    From class android.app.Fragment

    Constants

    String ARG_PREFERENCE_ROOT

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

    Inherited constants

    From interface android.content.ComponentCallbacks2

    Public constructors

    PreferenceFragment()

    Public methods

    void addPreferencesFromResource(int preferencesResId)

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

    Preference findPreference(CharSequence key)

    Finds a Preference based on its key.

    final RecyclerView getListView()
    PreferenceManager getPreferenceManager()

    Returns the PreferenceManager used by this fragment.

    PreferenceScreen getPreferenceScreen()

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

    void onActivityCreated(Bundle savedInstanceState)

    Called when the fragment's activity has been created and this fragment's view hierarchy instantiated.

    void onCreate(Bundle savedInstanceState)

    Called to do initial creation of a fragment.

    RecyclerView.LayoutManager onCreateLayoutManager()

    Called from onCreateRecyclerView(LayoutInflater, ViewGroup, Bundle) to create the RecyclerView.LayoutManager for the created RecyclerView.

    abstract void onCreatePreferences(Bundle savedInstanceState, String rootKey)

    Called during onCreate(Bundle) to supply the preferences for this fragment.

    RecyclerView onCreateRecyclerView(LayoutInflater inflater, ViewGroup parent, Bundle savedInstanceState)

    Creates the RecyclerView used to display the preferences.

    View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)

    Called to have the fragment instantiate its user interface view.

    void onDestroyView()

    Called when the view previously created by onCreateView(LayoutInflater, ViewGroup, Bundle) has been detached from the fragment.

    void onDisplayPreferenceDialog(Preference preference)

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

    void onNavigateToScreen(PreferenceScreen preferenceScreen)

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

    boolean onPreferenceTreeClick(Preference preference)

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

    void onSaveInstanceState(Bundle outState)

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

    void onStart()

    Called when the Fragment is visible to the user.

    void onStop()

    Called when the Fragment is no longer started.

    void onViewCreated(View view, Bundle savedInstanceState)

    Called immediately after onCreateView(LayoutInflater, ViewGroup, Bundle) has returned, but before any saved state has been restored in to the view.

    void scrollToPreference(Preference preference)
    void scrollToPreference(String key)
    void setDivider(Drawable divider)

    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 setPreferenceScreen(PreferenceScreen preferenceScreen)

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

    void setPreferencesFromResource(int preferencesResId, String key)

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

    Protected methods

    Adapter onCreateAdapter(PreferenceScreen preferenceScreen)

    Creates the root adapter.

    Inherited methods

    From class android.app.Fragment
    From class java.lang.Object
    From interface android.content.ComponentCallbacks2
    From interface android.view.View.OnCreateContextMenuListener
    From interface android.support.v7.preference.PreferenceManager.OnPreferenceTreeClickListener
    From interface android.support.v7.preference.PreferenceManager.OnDisplayPreferenceDialogListener
    From interface android.support.v7.preference.PreferenceManager.OnNavigateToScreenListener
    From interface android.support.v7.preference.DialogPreference.TargetFragment
    From interface android.content.ComponentCallbacks

    XML attributes

    android:divider

    List separator to draw between preference views

    May be a reference to another resource, in the form "@[+][package:]type/name" or a theme attribute in the form "?[package:]type/name".

    May be a color value, in the form of "#rgb", "#argb", "#rrggbb", or "#aarrggbb".

    Related methods:

    android:dividerHeight

    List separator height

    May be a dimension value, which is a floating point number appended with a unit such as "14.5sp". Available units are: px (pixels), dp (density-independent pixels), sp (scaled pixels based on preferred font size), in (inches), and mm (millimeters).

    Related methods:

    Constants

    ARG_PREFERENCE_ROOT

    added in version 23.0.0
    String ARG_PREFERENCE_ROOT

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

    Constant Value: "android.support.v7.preference.PreferenceFragmentCompat.PREFERENCE_ROOT"

    Public constructors

    PreferenceFragment

    added in version 23.0.0
    PreferenceFragment ()

    Public methods

    addPreferencesFromResource

    added in version 23.0.0
    void addPreferencesFromResource (int preferencesResId)

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

    Parameters
    preferencesResId int: The XML resource ID to inflate.

    findPreference

    added in version 23.0.0
    Preference findPreference (CharSequence key)

    Finds a Preference based on its key.

    Parameters
    key CharSequence: The key of the preference to retrieve.

    Returns
    Preference The Preference with the key, or null.

    getListView

    added in version 23.0.0
    RecyclerView getListView ()

    Returns
    RecyclerView

    getPreferenceManager

    added in version 23.0.0
    PreferenceManager getPreferenceManager ()

    Returns the PreferenceManager used by this fragment.

    Returns
    PreferenceManager The PreferenceManager.

    getPreferenceScreen

    added in version 23.0.0
    PreferenceScreen getPreferenceScreen ()

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

    Returns
    PreferenceScreen The PreferenceScreen that is the root of the preference hierarchy.

    onActivityCreated

    void onActivityCreated (Bundle savedInstanceState)

    Called when the fragment's activity has been created and this fragment's view hierarchy instantiated. It can be used to do final initialization once these pieces are in place, such as retrieving views or restoring state. It is also useful for fragments that use setRetainInstance(boolean) to retain their instance, as this callback tells the fragment when it is fully associated with the new activity instance. This is called after onCreateView(LayoutInflater, ViewGroup, Bundle) and before onViewStateRestored(Bundle).

    Parameters
    savedInstanceState Bundle: If the fragment is being re-created from a previous saved state, this is the state.

    onCreate

    void onCreate (Bundle savedInstanceState)

    Called to do initial creation of a fragment. This is called after onAttach(Activity) and before onCreateView(LayoutInflater, ViewGroup, Bundle), but is not called if the fragment instance is retained across Activity re-creation (see setRetainInstance(boolean)).

    Note that this can be called while the fragment's activity is still in the process of being created. As such, you can not rely on things like the activity's content view hierarchy being initialized at this point. If you want to do work once the activity itself is created, see onActivityCreated(Bundle).

    If your app's targetSdkVersion is M or lower, child fragments being restored from the savedInstanceState are restored after onCreate returns. When targeting N or above and running on an N or newer platform version they are restored by Fragment.onCreate.

    Parameters
    savedInstanceState Bundle: If the fragment is being re-created from a previous saved state, this is the state.

    onCreateLayoutManager

    added in version 23.0.0
    RecyclerView.LayoutManager onCreateLayoutManager ()

    Called from onCreateRecyclerView(LayoutInflater, ViewGroup, Bundle) to create the RecyclerView.LayoutManager for the created RecyclerView.

    Returns
    RecyclerView.LayoutManager A new RecyclerView.LayoutManager instance.

    onCreatePreferences

    added in version 23.0.0
    void onCreatePreferences (Bundle savedInstanceState, 
                    String rootKey)

    Called during onCreate(Bundle) to supply the preferences for this fragment. Subclasses are expected to call setPreferenceScreen(PreferenceScreen) either directly or via helper methods such as addPreferencesFromResource(int).

    Parameters
    savedInstanceState Bundle: If the fragment is being re-created from a previous saved state, this is the state.

    rootKey String: If non-null, this preference fragment should be rooted at the PreferenceScreen with this key.

    onCreateRecyclerView

    added in version 23.0.0
    RecyclerView onCreateRecyclerView (LayoutInflater inflater, 
                    ViewGroup parent, 
                    Bundle savedInstanceState)

    Creates the RecyclerView used to display the preferences. Subclasses may override this to return a customized RecyclerView.

    Parameters
    inflater LayoutInflater: The LayoutInflater object that can be used to inflate the RecyclerView.

    parent ViewGroup: The parent View that the RecyclerView will be attached to. This method should not add the view itself, but this can be used to generate the LayoutParams of the view.

    savedInstanceState Bundle: If non-null, this view is being re-constructed from a previous saved state as given here

    Returns
    RecyclerView A new RecyclerView object to be placed into the view hierarchy

    onCreateView

    View onCreateView (LayoutInflater inflater, 
                    ViewGroup container, 
                    Bundle savedInstanceState)

    Called to have the fragment instantiate its user interface view. This is optional, and non-graphical fragments can return null (which is the default implementation). This will be called between onCreate(Bundle) and onActivityCreated(Bundle).

    If you return a View from here, you will later be called in onDestroyView() when the view is being released.

    Parameters
    inflater LayoutInflater: The LayoutInflater object that can be used to inflate any views in the fragment,

    container ViewGroup: If non-null, this is the parent view that the fragment's UI should be attached to. The fragment should not add the view itself, but this can be used to generate the LayoutParams of the view.

    savedInstanceState Bundle: If non-null, this fragment is being re-constructed from a previous saved state as given here.

    Returns
    View Return the View for the fragment's UI, or null.

    onDestroyView

    void onDestroyView ()

    Called when the view previously created by onCreateView(LayoutInflater, ViewGroup, Bundle) has been detached from the fragment. The next time the fragment needs to be displayed, a new view will be created. This is called after onStop() and before onDestroy(). It is called regardless of whether onCreateView(LayoutInflater, ViewGroup, Bundle) returned a non-null view. Internally it is called after the view's state has been saved but before it has been removed from its parent.

    onDisplayPreferenceDialog

    added in version 23.0.0
    void onDisplayPreferenceDialog (Preference preference)

    Called when a preference in the tree requests to display a dialog. Subclasses should override this method to display custom dialogs or to handle dialogs for custom preference classes.

    Parameters
    preference Preference: The Preference object requesting the dialog.

    onNavigateToScreen

    added in version 23.0.0
    void onNavigateToScreen (PreferenceScreen preferenceScreen)

    Called by onClick() in order to navigate to a new screen of preferences. Calls onPreferenceStartScreen(PreferenceFragment, PreferenceScreen) if the target fragment or containing activity implements PreferenceFragment.OnPreferenceStartScreenCallback.

    Parameters
    preferenceScreen PreferenceScreen: The PreferenceScreen to navigate to.

    onPreferenceTreeClick

    added in version 23.0.0
    boolean onPreferenceTreeClick (Preference preference)

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

    Parameters
    preference Preference: The preference that was clicked.

    Returns
    boolean Whether the click was handled.

    onSaveInstanceState

    void onSaveInstanceState (Bundle outState)

    Called to ask the fragment to save its current dynamic state, so it can later be reconstructed in a new instance of its process is restarted. If a new instance of the fragment later needs to be created, the data you place in the Bundle here will be available in the Bundle given to onCreate(Bundle), onCreateView(LayoutInflater, ViewGroup, Bundle), and onActivityCreated(Bundle).

    This corresponds to Activity.onSaveInstanceState(Bundle) and most of the discussion there applies here as well. Note however: this method may be called at any time before onDestroy(). There are many situations where a fragment may be mostly torn down (such as when placed on the back stack with no UI showing), but its state will not be saved until its owning activity actually needs to save its state.

    Parameters
    outState Bundle: Bundle in which to place your saved state.

    onStart

    void onStart ()

    Called when the Fragment is visible to the user. This is generally tied to Activity.onStart of the containing Activity's lifecycle.

    onStop

    void onStop ()

    Called when the Fragment is no longer started. This is generally tied to Activity.onStop of the containing Activity's lifecycle.

    onViewCreated

    void onViewCreated (View view, 
                    Bundle savedInstanceState)

    Called immediately after onCreateView(LayoutInflater, ViewGroup, Bundle) has returned, but before any saved state has been restored in to the view. This gives subclasses a chance to initialize themselves once they know their view hierarchy has been completely created. The fragment's view hierarchy is not however attached to its parent at this point.

    Parameters
    view View: The View returned by onCreateView(LayoutInflater, ViewGroup, Bundle).

    savedInstanceState Bundle: If non-null, this fragment is being re-constructed from a previous saved state as given here.

    scrollToPreference

    added in version 24.0.0
    void scrollToPreference (Preference preference)

    Parameters
    preference Preference

    scrollToPreference

    added in version 24.0.0
    void scrollToPreference (String key)

    Parameters
    key String

    setDivider

    added in version 23.2.0
    void setDivider (Drawable divider)

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

    Note: If the drawable does not have an intrinsic height, you should also call setDividerHeight(int).

    Related XML Attributes:

    Parameters
    divider Drawable: the drawable to use

    setDividerHeight

    added in version 23.2.0
    void setDividerHeight (int height)

    Sets the height of the divider that will be drawn between each item in the list. Calling this will override the intrinsic height as set by setDivider(Drawable)

    Related XML Attributes:

    Parameters
    height int: The new height of the divider in pixels.

    setPreferenceScreen

    added in version 23.0.0
    void setPreferenceScreen (PreferenceScreen preferenceScreen)

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

    Parameters
    preferenceScreen PreferenceScreen: The root PreferenceScreen of the preference hierarchy.

    setPreferencesFromResource

    added in version 23.0.0
    void setPreferencesFromResource (int preferencesResId, 
                    String key)

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

    Parameters
    preferencesResId int: The XML resource ID to inflate.

    key String: The preference key of the PreferenceScreen to use as the root of the preference hierarchy, or null to use the root PreferenceScreen.

    Protected methods

    onCreateAdapter

    added in version 23.0.0
    Adapter onCreateAdapter (PreferenceScreen preferenceScreen)

    Creates the root adapter.

    Parameters
    preferenceScreen PreferenceScreen: Preference screen object to create the adapter for.

    Returns
    Adapter An adapter that contains the preferences contained in this PreferenceScreen.

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