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LoaderManager

public abstract class LoaderManager
extends Object

java.lang.Object
↳	android.support.v4.app.LoaderManager

Static library support version of the framework's LoaderManager. Used to write apps that run on platforms prior to Android 3.0. When running on Android 3.0 or above, this implementation is still used; it does not try to switch to the framework's implementation. See the framework SDK documentation for a class overview.

Your activity must derive from FragmentActivity to use this.

Summary

Nested classes
`interface`	`LoaderManager.LoaderCallbacks<D>` Callback interface for a client to interact with the manager.

Public constructors
`LoaderManager()`

Public methods
`abstract void`	`destroyLoader(int id)` Stops and removes the loader with the given ID.
`abstract void`	`dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args)` Print the LoaderManager's state into the given stream.
`static void`	`enableDebugLogging(boolean enabled)` Control whether the framework's internal loader manager debugging logs are turned on.
`abstract <D> Loader<D>`	`getLoader(int id)` Return the Loader with the given id or null if no matching Loader is found.
`boolean`	`hasRunningLoaders()` Returns true if any loaders managed are currently running and have not returned data to the application yet.
`abstract <D> Loader<D>`	`initLoader(int id, Bundle args, LoaderCallbacks<D> callback)` Ensures a loader is initialized and active.
`abstract <D> Loader<D>`	`restartLoader(int id, Bundle args, LoaderCallbacks<D> callback)` Starts a new or restarts an existing `Loader` in this manager, registers the callbacks to it, and (if the activity/fragment is currently started) starts loading it.

Inherited methods

From class


  
    java.lang.Object

`Object`	`clone()` Creates and returns a copy of this object.
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the object.
`final void`	`notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()` Returns a string representation of the object.
`final void`	`wait(long millis, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void`	`wait(long millis)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void`	`wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

Public constructors

LoaderManager

LoaderManager ()

Public methods

destroyLoader

void destroyLoader (int id)

Stops and removes the loader with the given ID. If this loader had previously reported data to the client through onLoadFinished(Loader, Object), a call will be made to onLoaderReset(Loader).

Parameters
`id`	`int`

dump

void dump (String prefix, 
                FileDescriptor fd, 
                PrintWriter writer, 
                String[] args)

Print the LoaderManager's state into the given stream.

Parameters
`prefix`	`String`: Text to print at the front of each line.
`fd`	`FileDescriptor`: The raw file descriptor that the dump is being sent to.
`writer`	`PrintWriter`: A PrintWriter to which the dump is to be set.
`args`	`String`: Additional arguments to the dump request.

enableDebugLogging

void enableDebugLogging (boolean enabled)

Control whether the framework's internal loader manager debugging logs are turned on. If enabled, you will see output in logcat as the framework performs loader operations.

Parameters
`enabled`	`boolean`

getLoader

Loader<D> getLoader (int id)

Return the Loader with the given id or null if no matching Loader is found.

Parameters
`id`	`int`

Returns
`Loader<D>`

hasRunningLoaders

boolean hasRunningLoaders ()

Returns true if any loaders managed are currently running and have not returned data to the application yet.

Returns
`boolean`

initLoader

Loader<D> initLoader (int id, 
                Bundle args, 
                LoaderCallbacks<D> callback)

Ensures a loader is initialized and active. If the loader doesn't already exist, one is created and (if the activity/fragment is currently started) starts the loader. Otherwise the last created loader is re-used.

In either case, the given callback is associated with the loader, and will be called as the loader state changes. If at the point of call the caller is in its started state, and the requested loader already exists and has generated its data, then callback onLoadFinished(Loader, D) will be called immediately (inside of this function), so you must be prepared for this to happen.

Parameters
`id`	`int`: A unique identifier for this loader. Can be whatever you want. Identifiers are scoped to a particular LoaderManager instance.
`args`	`Bundle`: Optional arguments to supply to the loader at construction. If a loader already exists (a new one does not need to be created), this parameter will be ignored and the last arguments continue to be used.
`callback`	`LoaderCallbacks`: Interface the LoaderManager will call to report about changes in the state of the loader. Required.

Returns
`Loader<D>`

restartLoader

Loader<D> restartLoader (int id, 
                Bundle args, 
                LoaderCallbacks<D> callback)

Starts a new or restarts an existing Loader in this manager, registers the callbacks to it, and (if the activity/fragment is currently started) starts loading it. If a loader with the same id has previously been started it will automatically be destroyed when the new loader completes its work. The callback will be delivered before the old loader is destroyed.

Parameters
`id`	`int`: A unique identifier for this loader. Can be whatever you want. Identifiers are scoped to a particular LoaderManager instance.
`args`	`Bundle`: Optional arguments to supply to the loader at construction.
`callback`	`LoaderCallbacks`: Interface the LoaderManager will call to report about changes in the state of the loader. Required.

Returns
`Loader<D>`

Interfaces

Classes

Exceptions

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LoaderManager

Summary

Nested classes

Public constructors

Public methods

Inherited methods

Public constructors

LoaderManager

Public methods

destroyLoader

dump

enableDebugLogging

getLoader

hasRunningLoaders

initLoader

restartLoader