ComponentCallbackspublic interface ComponentCallbacks | The set of callback APIs that are common to all application components
({@link android.app.Activity}, {@link android.app.Service},
{@link ContentProvider}, and {@link android.app.Application}).
Note: You should also implement the {@link
ComponentCallbacks2} interface, which provides the {@link
ComponentCallbacks2#onTrimMemory} callback to help your app manage its memory usage more
effectively. |
| Methods Summary |
|---|
| public void | onConfigurationChanged(android.content.res.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.
| | public void | onLowMemory()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.
You should implement this method to release
any caches or other unnecessary resources you may be holding on to.
The system will perform a garbage collection for you after returning from this method.
Preferably, you should implement {@link ComponentCallbacks2#onTrimMemory} from
{@link ComponentCallbacks2} to incrementally unload your resources based on various
levels of memory demands. That API is available for API level 14 and higher, so you should
only use this {@link #onLowMemory} method as a fallback for older versions, which can be
treated the same as {@link ComponentCallbacks2#onTrimMemory} with the {@link
ComponentCallbacks2#TRIM_MEMORY_COMPLETE} level.
|
|
