Android Studio
Added in API level 1
Summary: Methods

ComponentCallbacks

public interface ComponentCallbacks

android.content.ComponentCallbacks
AbstractInputMethodService AbstractInputMethodService provides a abstract base class for input methods.  AccessibilityService Accessibility services should only be used to assist users with disabilities in using Android devices and apps.  AccountAuthenticatorActivity This class was deprecated in API level 30. Applications should extend Activity themselves. This class is not compatible with AppCompat, and the functionality it provides is not complex.  Activity An activity is a single, focused thing that the user can do.  ActivityGroup This class was deprecated in API level 13. Use the new Fragment and FragmentManager APIs instead; these are also available on older platforms through the Android compatibility package.  AliasActivity This class was deprecated in API level 30. Use <activity-alias> or subclass Activity directly.  AlternativeMessageTransportService AlternativeMessageTransportService (AMTS) allows the default SMS app to handle the sending of a message over a different transport (e.g. RCS etc.) other than the SMS or MMS.  AppContentProjectionService Service to be implemented by the application providing the MediaProjectionAppContent.  AppFunctionService Extend this class to implement app functions, that can be executed by AppFunctionManager.executeAppFunction.  Application Base class for maintaining global application state.  AutofillService An AutofillService is a service used to automatically fill the contents of the screen on behalf of a given user - for more information about autofill, read Autofill Framework.  CallRedirectionService This service can be implemented to interact between Telecom and its implementor for making outgoing call with optional redirection/cancellation purposes.  CallScreeningService This service can be implemented by the default dialer (see TelecomManager.getDefaultDialerPackage()) or a third party app to allow or disallow incoming calls before they are shown to a user.  CameraPrewarmService Extend this class to implement a camera prewarm service.  CarrierMessagingClientService If the default SMS app has a service that extends this class, the system always tries to bind it so that the process is always running, which allows the app to have a persistent connection to the server.  CarrierMessagingService A service that receives calls from the system when new SMS and MMS are sent or received.  CarrierService A service that exposes carrier-specific functionality to the system.  ChooserTargetService This class was deprecated in API level 30. For publishing direct share targets, please follow the instructions in https://developer.android.com/training/sharing/receive.html#providing-direct-share-targets instead.  CloudMediaProvider Base class for a cloud media provider.  CompanionDeviceService A service that receives calls from the system with device events.  ComponentCallbacks2 Callbacks for app state transitions that can be used to improve background memory management.  ConditionProviderService This class was deprecated in API level 29. Instead of using an automatically bound service, use android.app.NotificationManager.setAutomaticZenRuleState(String,Condition) to tell the system about the state of your rule. In order to maintain a link from Settings to your rule configuration screens, provide a configuration activity that handles NotificationManager.ACTION_AUTOMATIC_ZEN_RULE on your AutomaticZenRule via android.app.AutomaticZenRule.setConfigurationActivity(ComponentName).  ConnectionService An abstract service that should be implemented by any apps which either: Can make phone calls (VoIP or otherwise) and want those calls to be integrated into the built-in phone app.  ContentProvider Content providers are one of the primary building blocks of Android applications, providing content to applications.  ControlsProviderService Service implementation allowing applications to contribute controls to the System UI.  CredentialProviderService Service to be extended by credential providers, in order to return user credentials to the framework.  DataMigrationToPccService Base class for a service that handles data migration to the Private Compute Core (PCC) storage of an application.  DeviceAdminService Base class for a service that device owner/profile owners can optionally have.  DialogFragment This class was deprecated in API level 28. Use the Support Library DialogFragment for consistent behavior across all devices and access to Lifecycle.  DocumentsProvider Base class for a document provider.  DreamService Extend this class to implement a custom dream (available to the user as a "Daydream").  ExpandableListActivity This class was deprecated in API level 30. Use RecyclerView or use ExpandableListView directly  Fragment This class was deprecated in API level 28. Use the Jetpack Fragment Library Fragment for consistent behavior across all devices and access to Lifecycle.  HostApduService HostApduService is a convenience Service class that can be extended to emulate an NFC card inside an Android service component.  HostNfcFService HostNfcFService is a convenience Service class that can be extended to emulate an NFC-F card inside an Android service component.  InCallService This service is implemented by an app that wishes to provide functionality for managing phone calls.  InputMethodService InputMethodService provides a standard implementation of an InputMethod, which final implementations can derive from and customize.  IntentService This class was deprecated in API level 30. IntentService is subject to all the background execution limits imposed with Android 8.0 (API level 26). Consider using WorkManager instead.  IsolatedService This class was deprecated in API level 37. The ODP APIs are deprecated and will not be supported in future Android releases. There is no direct replacement API available. Developers currently integrated with these APIs must cease further integration efforts. For comprehensive details regarding this deprecation and the future roadmap of Privacy Sandbox on Android, please consult the official Privacy Sandbox developer documentation and announcements: https://privacysandbox.google.com  JobService Entry point for the callback from the JobScheduler.  LauncherActivity This class was deprecated in API level 30. Applications can implement this UI themselves using RecyclerView and android.content.pm.PackageManager.queryIntentActivities(Intent,int)  ListActivity This class was deprecated in API level 30. Use ListFragment or RecyclerView to implement your Activity instead.  ListFragment This class was deprecated in API level 28. Use the Support Library ListFragment for consistent behavior across all devices and access to Lifecycle.  MediaBrowserService Base class for media browser services.  MediaRoute2ProviderService Base class for media route provider services.  MediaSession2Service This class was deprecated in API level 37. Use the Media3 support library's androidx.media3.session.MediaSessionService instead.  MidiDeviceService A service that implements a virtual MIDI device.  MidiUmpDeviceService A service that implements a virtual MIDI device for Universal MIDI Packets (UMP).  MockApplication This class was deprecated in API level 24. Use a mocking framework like Mockito. New tests should be written using the Android Testing Support Library.  MockContentProvider Mock implementation of ContentProvider.  NativeActivity Convenience for implementing an activity that will be implemented purely in native code.  NotificationListenerService A service that receives calls from the system when new notifications are posted or removed, or their ranking changed.  OffHostApduService

OffHostApduService is a convenience Service class that can be extended to describe one or more NFC applications that are residing off-host, for example on an embedded secure element or a UICC.  PccService Abstract base class for a PCC service that receives data from other components.  PreferenceActivity This class was deprecated in API level 29. Use the AndroidX Preference Library for consistent behavior across all devices. For more information on using the AndroidX Preference Library see Settings.  PreferenceFragment This class was deprecated in API level 28. Use the AndroidX Preference Library for consistent behavior across all devices. For more information on using the AndroidX Preference Library see Settings.  PrintService

This is the base class for implementing print services.  QuickAccessWalletService A QuickAccessWalletService provides a list of WalletCards shown in the Quick Access Wallet.  RecognitionService This class provides a base class for recognition service implementations.  RemoteViewsService The service to be connected to for a remote adapter to request RemoteViews.  SearchRecentSuggestionsProvider This superclass can be used to create a simple search suggestions provider for your application.  Service A Service is an application component representing either an application's desire to perform a longer-running operation while not interacting with the user or to supply functionality for other applications to use.  SettingInjectorService Dynamically specifies the summary (subtitle) and enabled status of a preference injected into the list of app settings displayed by the system settings app

For use only by apps that are included in the system image, for preferences that affect multiple apps.  SettingsPreferenceService Base class for a service that exposes its settings preferences to external access.  SliceProvider This class was deprecated in API level 35. Slice framework has been deprecated, it will not receive any updates from ERROR(/android.os.Build.VANILLA_ICE_CREAM) and forward. If you are looking for a framework that sends displayable data from one app to another, consider using AppSearchManager.  SpellCheckerService SpellCheckerService provides an abstract base class for a spell checker.  TabActivity This class was deprecated in API level 13. New applications should use Fragments instead of this class; to continue to run on older devices, you can use the v4 support library which provides a version of the Fragment API that is compatible down to Build.VERSION_CODES.DONUT.  TextToSpeechService Abstract base class for TTS engine implementations.  TileService A TileService provides the user a tile that can be added to Quick Settings.  TvAdService The TvAdService class represents a TV client-side advertisement service.  TvInputService The TvInputService class represents a TV input or source such as HDMI or built-in tuner which provides pass-through video or broadcast TV programs.  TvInteractiveAppService A TV interactive application service is a service that provides runtime environment and runs TV interactive applications.  VisualVoicemailService This service is implemented by dialer apps that wishes to handle OMTP or similar visual voicemails.  VoiceInteractionService Top-level service of the current global voice interactor, which is providing support for hotwording, the back-end of a VoiceInteractor, etc.  VoiceInteractionSession An active voice interaction session, providing a facility for the implementation to interact with the user in the voice interaction layer.  VoiceInteractionSessionService An active voice interaction session, initiated by a VoiceInteractionService.  VpnService VpnService is a base class for applications to extend and build their own VPN solutions.  VrListenerService A service that is bound from the system while running in virtual reality (VR) mode.  WallpaperService A wallpaper service is responsible for showing a live wallpaper behind applications that would like to sit on top of it.  WebViewFragment This class was deprecated in API level 28. Manually call WebView.onPause() and WebView.onResume() 


The set of callback APIs that are common to all application components (Activity, Service, ContentProvider, and Application).

Note: You should also implement the ComponentCallbacks2 interface, which provides the ComponentCallbacks2.onTrimMemory callback to help your app manage its memory usage more effectively.

Summary

Public methods

abstract void onConfigurationChanged(Configuration newConfig)

Called by the system when the device configuration changes while your component is running.

abstract void onLowMemory()

This method was deprecated in API level 35. Since API level 14 this is superseded by ComponentCallbacks2.onTrimMemory. Since API level 34 this is never called. If you're overriding ComponentCallbacks2#onTrimMemory and your minSdkVersion is greater than API 14, you can provide an empty implementation for this method.

Public methods

onConfigurationChanged

Added in API level 1 
public abstract void onConfigurationChanged (Configuration newConfig)

Called by the system when the device configuration changes while your component is running. Note that, unlike activities, other components are never restarted when a configuration changes: they must always deal with the results of the change, such as by re-retrieving resources.

At the time that this function has been called, your Resources object will have been updated to return resource values matching the new configuration.

For more information, read Handling Runtime Changes.

Parameters
newConfig Configuration: The new device configuration.
This value cannot be null.

onLowMemory

Added in API level 1
Deprecated in API level 35 
public abstract void onLowMemory ()

This method was deprecated in API level 35.
Since API level 14 this is superseded by ComponentCallbacks2.onTrimMemory. Since API level 34 this is never called. If you're overriding ComponentCallbacks2#onTrimMemory and your minSdkVersion is greater than API 14, you can provide an empty implementation for this method.

This is called when the overall system is running low on memory, and actively running processes should trim their memory usage. While the exact point at which this will be called is not defined, generally it will happen when all background process have been killed. That is, before reaching the point of killing processes hosting service and foreground UI that we would like to avoid killing.