ComponentCallbacks

android.content.ComponentCallbacks

Known Indirect Subclasses

AbstractInputMethodService, AccessibilityService, AccountAuthenticatorActivity, Activity, ActivityGroup, AliasActivity, Application, ContentProvider, ExpandableListActivity, InputMethodService, IntentService, LauncherActivity, ListActivity, MockApplication, PreferenceActivity, SearchRecentSuggestionsProvider, Service, TabActivity, WallpaperService

AbstractInputMethodService	AbstractInputMethodService provides a abstract base class for input methods.
AccessibilityService	An accessibility service runs in the background and receives callbacks by the system when `AccessibilityEvent`s are fired.
AccountAuthenticatorActivity	Base class for implementing an Activity that is used to help implement an AbstractAccountAuthenticator.
Activity	An activity is a single, focused thing that the user can do.
ActivityGroup	A screen that contains and runs multiple embedded activities.
AliasActivity	Stub activity that launches another activity (and then finishes itself) based on information in its component's manifest meta-data.
Application	Base class for those who need to maintain global application state.
ContentProvider	Content providers are one of the primary building blocks of Android applications, providing content to applications.
ExpandableListActivity	An activity that displays an expandable list of items by binding to a data source implementing the ExpandableListAdapter, and exposes event handlers when the user selects an item.
InputMethodService	InputMethodService provides a standard implementation of an InputMethod, which final implementations can derive from and customize.
IntentService	An abstract `Service` that serializes the handling of the Intents passed upon service start and handles them on a handler thread.
LauncherActivity	Displays a list of all activities which can be performed for a given intent.
ListActivity	An activity that displays a list of items by binding to a data source such as an array or Cursor, and exposes event handlers when the user selects an item.
MockApplication	A mock `Application` class.
PreferenceActivity	Shows a hierarchy of `Preference` objects as lists, possibly spanning multiple screens.
SearchRecentSuggestionsProvider	This superclass can be used to create a simple search suggestions provider for your application.
Service	A Service is an application component that runs in the background, not interacting with the user, for an indefinite period of time.
TabActivity	An activity that contains and runs multiple embedded activities or views.
WallpaperService	A wallpaper service is responsible for showing a live wallpaper behind applications that would like to sit on top of it.

Class Overview

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

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 is called when the overall system is running low on memory, and would like actively running process to try to tighten their belt.

Public Methods

public abstract void onConfigurationChanged (Configuration newConfig)

Since: API Level 1

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.

Parameters

newConfig	The new device configuration.

public abstract void onLowMemory ()

Since: API Level 1

This is called when the overall system is running low on memory, and would like actively running process to try to tighten their belt. While the exact point at which this will be called is not defined, generally it will happen around the time 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.

Applications that want to be nice can implement this method to release any caches or other unnecessary resources they may be holding on to. The system will perform a gc for you after returning from this method.

Interfaces

Classes