FragmentController


public class FragmentController


Provides integration points with a FragmentManager for a fragment host.

It is the responsibility of the host to take care of the Fragment's lifecycle. The methods provided by FragmentController are for that purpose.

Summary

Public methods

void

Attaches the host to the FragmentManager for this controller.

static @NonNull FragmentController

Returns a FragmentController.

void

Moves all Fragments managed by the controller's FragmentManager into the activity created state.

void

This method is deprecated.

Have your FragmentHostCallback implement androidx.core.content.OnConfigurationChangedProvider to automatically dispatch configuration changes to fragments.

boolean

Sends a context item selection event to the Fragments managed by the controller's FragmentManager.

void

Moves all Fragments managed by the controller's FragmentManager into the create state.

boolean
dispatchCreateOptionsMenu(
    @NonNull Menu menu,
    @NonNull MenuInflater inflater
)

This method is deprecated.

Have your FragmentHostCallback implement MenuHost to automatically dispatch menu changes to fragments.

void

Moves Fragments managed by the controller's FragmentManager into the destroy state.

void

Moves all Fragments managed by the controller's FragmentManager into the destroy view state.

void

This method is deprecated.

Have your FragmentHostCallback implement androidx.core.content.OnTrimMemoryProvider to automatically dispatch low memory callbacks to fragments.

void
dispatchMultiWindowModeChanged(boolean isInMultiWindowMode)

This method is deprecated.

Have your FragmentHostCallback implement androidx.core.app.OnMultiWindowModeChangedProvider to automatically dispatch multi-window mode changes to fragments.

boolean

This method is deprecated.

Have your FragmentHostCallback implement MenuHost to automatically dispatch menu changes to fragments.

void

This method is deprecated.

Have your FragmentHostCallback implement MenuHost to automatically dispatch menu changes to fragments.

void

Moves all Fragments managed by the controller's FragmentManager into the pause state.

void
dispatchPictureInPictureModeChanged(boolean isInPictureInPictureMode)

This method is deprecated.

Have your FragmentHostCallback implement androidx.core.app.OnPictureInPictureModeChangedProvider to automatically dispatch picture-in-picture mode changes to fragments.

boolean

This method is deprecated.

Have your FragmentHostCallback implement MenuHost to automatically dispatch menu changes to fragments.

void

This method is deprecated.

This functionality has been rolled into dispatchStop.

void

Moves all Fragments managed by the controller's FragmentManager into the resume state.

void

Moves all Fragments managed by the controller's FragmentManager into the start state.

void

Moves all Fragments managed by the controller's FragmentManager into the stop state.

void

This method is deprecated.

Loaders are managed separately from FragmentController

void

This method is deprecated.

Loaders are managed separately from FragmentController

void

This method is deprecated.

Loaders are managed separately from FragmentController

void
doLoaderStop(boolean retain)

This method is deprecated.

Loaders are managed separately from FragmentController

void
dumpLoaders(
    @NonNull String prefix,
    @Nullable FileDescriptor fd,
    @NonNull PrintWriter writer,
    @Nullable String[] args
)

This method is deprecated.

Loaders are managed separately from FragmentController

boolean

Execute any pending actions for the Fragments managed by the controller's FragmentManager.

@Nullable Fragment

Returns a fragment with the given identifier.

@NonNull List<Fragment>

Returns the list of active fragments.

int

Returns the number of active fragments.

@NonNull FragmentManager

Returns a FragmentManager for this controller.

LoaderManager

This method is deprecated.

Loaders are managed separately from FragmentController and this now throws an UnsupportedOperationException.

void

Marks the fragment state as unsaved.

@Nullable View
onCreateView(
    @Nullable View parent,
    @NonNull String name,
    @NonNull Context context,
    @NonNull AttributeSet attrs
)

Instantiates a Fragment's view.

void

This method is deprecated.

Loaders are managed separately from FragmentController

void

This method is deprecated.

Have your FragmentHostCallback implement ViewModelStoreOwner to automatically restore the Fragment's non configuration state and use restoreSaveState to restore the Fragment's save state.

void
restoreAllState(
    @Nullable Parcelable state,
    @Nullable List<Fragment> nonConfigList
)

This method is deprecated.

Have your FragmentHostCallback implement ViewModelStoreOwner to automatically restore the Fragment's non configuration state and use restoreSaveState to restore the Fragment's save state.

void

This method is deprecated.

Loaders are managed separately from FragmentController

void

This method is deprecated.

Have your FragmentHostCallback implement androidx.savedstate.SavedStateRegistryOwner to automatically restore the saved state via the FragmentManager.

@Nullable SimpleArrayMap<StringLoaderManager>

This method is deprecated.

Loaders are managed separately from FragmentController

@Nullable FragmentManagerNonConfig

This method is deprecated.

Have your FragmentHostCallback implement ViewModelStoreOwner to automatically retain the Fragment's non configuration state.

@Nullable List<Fragment>

This method is deprecated.

Have your FragmentHostCallback implement ViewModelStoreOwner to automatically retain the Fragment's non configuration state.

@Nullable Parcelable

This method is deprecated.

Have your FragmentHostCallback implement androidx.savedstate.SavedStateRegistryOwner to automatically save state via the FragmentManager.

Public methods

attachHost

Added in 1.1.0
public void attachHost(@Nullable Fragment parent)

Attaches the host to the FragmentManager for this controller. The host must be attached before the FragmentManager can be used to manage Fragments.

createController

Added in 1.1.0
public static @NonNull FragmentController createController(@NonNull FragmentHostCallback<Object> callbacks)

Returns a FragmentController.

dispatchActivityCreated

Added in 1.1.0
public void dispatchActivityCreated()

Moves all Fragments managed by the controller's FragmentManager into the activity created state.

Call when Fragments should be informed their host has been created.

See also
Fragment

dispatchConfigurationChanged

Added in 1.1.0
Deprecated in 1.5.0
public void dispatchConfigurationChanged(@NonNull Configuration newConfig)

Lets all Fragments managed by the controller's FragmentManager know a configuration change occurred.

Call when there is a configuration change.

dispatchContextItemSelected

Added in 1.1.0
public boolean dispatchContextItemSelected(@NonNull MenuItem item)

Sends a context item selection event to the Fragments managed by the controller's FragmentManager. Once the event has been consumed, no additional handling will be performed.

Call immediately after an options menu item has been selected

Returns
boolean

true if the context menu selection event was consumed

dispatchCreate

Added in 1.1.0
public void dispatchCreate()

Moves all Fragments managed by the controller's FragmentManager into the create state.

Call when Fragments should be created.

See also
Fragment

dispatchCreateOptionsMenu

Added in 1.1.0
Deprecated in 1.5.0
public boolean dispatchCreateOptionsMenu(
    @NonNull Menu menu,
    @NonNull MenuInflater inflater
)

Lets all Fragments managed by the controller's FragmentManager know they should create an options menu.

Call when the Fragment should create an options menu.

Returns
boolean

true if the options menu contains items to display

dispatchDestroy

Added in 1.1.0
public void dispatchDestroy()

Moves Fragments managed by the controller's FragmentManager into the destroy state.

If the androidx.fragment.app.FragmentHostCallback is an instance of ViewModelStoreOwner, then retained Fragments and any other non configuration state such as any androidx.lifecycle.ViewModel attached to Fragments will only be destroyed if clear is called prior to this method.

Otherwise, the FragmentManager will look to see if the host's Context is an Activity and if isChangingConfigurations returns true. In only that case will non configuration state be retained.

Call when Fragments should be destroyed.

See also
onDestroy

dispatchDestroyView

Added in 1.1.0
public void dispatchDestroyView()

Moves all Fragments managed by the controller's FragmentManager into the destroy view state.

Call when the Fragment's views should be destroyed.

See also
onDestroyView

dispatchLowMemory

Added in 1.1.0
Deprecated in 1.5.0
public void dispatchLowMemory()

Lets all Fragments managed by the controller's FragmentManager know the device is in a low memory condition.

Call when the device is low on memory and Fragment's should trim their memory usage.

See also
onLowMemory

dispatchMultiWindowModeChanged

Added in 1.1.0
Deprecated in 1.5.0
public void dispatchMultiWindowModeChanged(boolean isInMultiWindowMode)

Lets all Fragments managed by the controller's FragmentManager know the multi-window mode of the activity changed.

Call when the multi-window mode of the activity changed.

dispatchOptionsItemSelected

Added in 1.1.0
Deprecated in 1.5.0
public boolean dispatchOptionsItemSelected(@NonNull MenuItem item)

Sends an option item selection event to the Fragments managed by the controller's FragmentManager. Once the event has been consumed, no additional handling will be performed.

Call immediately after an options menu item has been selected

Returns
boolean

true if the options menu selection event was consumed

dispatchOptionsMenuClosed

Added in 1.1.0
Deprecated in 1.5.0
public void dispatchOptionsMenuClosed(@NonNull Menu menu)

Lets all Fragments managed by the controller's FragmentManager know their options menu has closed.

Call immediately after closing the Fragment's options menu.

dispatchPause

Added in 1.1.0
public void dispatchPause()

Moves all Fragments managed by the controller's FragmentManager into the pause state.

Call when Fragments should be paused.

See also
onPause

dispatchPictureInPictureModeChanged

Added in 1.1.0
Deprecated in 1.5.0
public void dispatchPictureInPictureModeChanged(boolean isInPictureInPictureMode)

Lets all Fragments managed by the controller's FragmentManager know the picture-in-picture mode of the activity changed.

Call when the picture-in-picture mode of the activity changed.

dispatchPrepareOptionsMenu

Added in 1.1.0
Deprecated in 1.5.0
public boolean dispatchPrepareOptionsMenu(@NonNull Menu menu)

Lets all Fragments managed by the controller's FragmentManager know they should prepare their options menu for display.

Call immediately before displaying the Fragment's options menu.

Returns
boolean

true if the options menu contains items to display

dispatchReallyStop

Added in 1.1.0
Deprecated in 1.1.0
public void dispatchReallyStop()

dispatchResume

Added in 1.1.0
public void dispatchResume()

Moves all Fragments managed by the controller's FragmentManager into the resume state.

Call when Fragments should be resumed.

See also
onResume

dispatchStart

Added in 1.1.0
public void dispatchStart()

Moves all Fragments managed by the controller's FragmentManager into the start state.

Call when Fragments should be started.

See also
onStart

dispatchStop

Added in 1.1.0
public void dispatchStop()

Moves all Fragments managed by the controller's FragmentManager into the stop state.

Call when Fragments should be stopped.

See also
onStop

doLoaderDestroy

Added in 1.1.0
Deprecated in 1.1.0
public void doLoaderDestroy()

Destroys the loaders and, if their state is not being retained, removes them.

doLoaderRetain

Added in 1.1.0
Deprecated in 1.1.0
public void doLoaderRetain()

Retains the state of each of the loaders.

doLoaderStart

Added in 1.1.0
Deprecated in 1.1.0
public void doLoaderStart()

Starts the loaders.

doLoaderStop

Added in 1.1.0
Deprecated in 1.1.0
public void doLoaderStop(boolean retain)

Stops the loaders, optionally retaining their state. This is useful for keeping the loader state across configuration changes.

Parameters
boolean retain

When true, the loaders aren't stopped, but, their instances are retained in a started state

dumpLoaders

Added in 1.1.0
Deprecated in 1.1.0
public void dumpLoaders(
    @NonNull String prefix,
    @Nullable FileDescriptor fd,
    @NonNull PrintWriter writer,
    @Nullable String[] args
)

Dumps the current state of the loaders.

execPendingActions

Added in 1.1.0
public boolean execPendingActions()

Execute any pending actions for the Fragments managed by the controller's FragmentManager.

Call when queued actions can be performed [eg when the Fragment moves into a start or resume state].

Returns
boolean

true if queued actions were performed

findFragmentByWho

Added in 1.1.0
public @Nullable Fragment findFragmentByWho(@NonNull String who)

Returns a fragment with the given identifier.

getActiveFragments

Added in 1.1.0
public @NonNull List<FragmentgetActiveFragments(List<Fragment> actives)

Returns the list of active fragments.

getActiveFragmentsCount

Added in 1.1.0
public int getActiveFragmentsCount()

Returns the number of active fragments.

getSupportFragmentManager

Added in 1.1.0
public @NonNull FragmentManager getSupportFragmentManager()

Returns a FragmentManager for this controller.

getSupportLoaderManager

Added in 1.1.0
Deprecated in 1.1.0
public LoaderManager getSupportLoaderManager()

Returns a LoaderManager.

See also
getInstance

noteStateNotSaved

Added in 1.1.0
public void noteStateNotSaved()

Marks the fragment state as unsaved. This allows for "state loss" detection.

onCreateView

Added in 1.1.0
public @Nullable View onCreateView(
    @Nullable View parent,
    @NonNull String name,
    @NonNull Context context,
    @NonNull AttributeSet attrs
)

Instantiates a Fragment's view.

Parameters
@Nullable View parent

The parent that the created view will be placed in; note that this may be null.

@NonNull String name

Tag name to be inflated.

@NonNull Context context

The context the view is being created in.

@NonNull AttributeSet attrs

Inflation attributes as specified in XML file.

Returns
@Nullable View

view the newly created view

reportLoaderStart

Added in 1.1.0
Deprecated in 1.1.0
public void reportLoaderStart()

Lets the loaders know the host is ready to receive notifications.

restoreAllState

Added in 1.1.0
Deprecated in 1.1.0
public void restoreAllState(
    @Nullable Parcelable state,
    @Nullable FragmentManagerNonConfig nonConfig
)

Restores the saved state for all Fragments. The given FragmentManagerNonConfig are Fragment instances retained across configuration changes, including nested fragments

restoreAllState

Added in 1.1.0
Deprecated in 1.1.0
public void restoreAllState(
    @Nullable Parcelable state,
    @Nullable List<Fragment> nonConfigList
)

Restores the saved state for all Fragments. The given Fragment list are Fragment instances retained across configuration changes.

restoreLoaderNonConfig

Added in 1.1.0
Deprecated in 1.1.0
public void restoreLoaderNonConfig(
    SimpleArrayMap<StringLoaderManager> loaderManagers
)

Restores the saved state for all LoaderManagers. The given LoaderManager list are LoaderManager instances retained across configuration changes.

restoreSaveState

Added in 1.1.0
Deprecated in 1.4.0
public void restoreSaveState(@Nullable Parcelable state)

Restores the saved state for all Fragments.

Parameters
@Nullable Parcelable state

the saved state containing the Parcelable returned by saveAllState

See also
saveAllState

retainLoaderNonConfig

Added in 1.1.0
Deprecated in 1.1.0
public @Nullable SimpleArrayMap<StringLoaderManagerretainLoaderNonConfig()

Returns a list of LoaderManagers that have opted to retain their instance across configuration changes.

retainNestedNonConfig

Added in 1.1.0
Deprecated in 1.1.0
public @Nullable FragmentManagerNonConfig retainNestedNonConfig()

Returns a nested tree of Fragments that have opted to retain their instance across configuration changes.

retainNonConfig

Added in 1.1.0
Deprecated in 1.1.0
public @Nullable List<FragmentretainNonConfig()

Returns a list of Fragments that have opted to retain their instance across configuration changes.

saveAllState

Added in 1.1.0
Deprecated in 1.4.0
public @Nullable Parcelable saveAllState()

Saves the state for all Fragments.

See also
restoreSaveState