Loader
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Loader allows loading of data asynchronously in an activity or fragment. The LoaderManager initializes and manages Loader objects to perform loading. Loaders automatically reconnect to previously loaded data after configuration changes. Common loaders include AsyncTaskLoader and CursorLoader. To implement, an activity or fragment gets the LoaderManager and initializes a loader, providing a LoaderCallbacks implementation to receive loading callbacks.
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- 2. Intoduction Asynchronously load data in an activity or fragment. Automatically reconnect to the last their cursor when being recreated after a configuration change (like screen flips). Thus, they don't need to re-query their data. Introduced in Honeycomb, exist on Android Support Package v-4.
- 3. Involved Classes and Interfaces LoaderManager LoaderManager.LoaderCallbacks Loader AsyncTaskLoader CursorLoader
- 4. Common Approach... LoaderManager to initialize a Loader. There is only one LoaderManager per activity or fragment, but a LoaderManager can have multiple loaders. LoaderManager.LoaderCallbacks: a callback interface for a client to interact with the LoaderManager. Loader: an abstract class that performs asynchronous loading of data. This is the base class for a loader.
- 5. ...Common Approach AsyncTaskLoader: abstract loader that provides an AsyncTask to do the work. A CursorLoader used to load data which backed by a ContentProvider. Alternatively, implement a subclass of Loader or AsyncTaskLoader to load data from some other source. A SimpleCursorAdapter used to display the loaders data.
- 6. Implementation Starting a Loader getLoaderManager().initLoader(0, null, this); Within Activity via onCreate() method. Within Fragment via onActivityCreated() method. Restarting a Loader getLoaderManager().restartLoader(0, null, this);
- 7. Using the LoaderManager Callbacks LoaderManager.LoaderCallbacks includes these methods: onCreateLoader() Instantiate and return a new Loader for the given ID. onLoadFinished() Called when a previously created Loader has finished its load. onLoaderReset() Called when a previously created Loader is being reset, thus making its data.
- 9. References http://developer.android.com/guide/components /loaders.html http://developer.android.com/reference/android/ content/Loader.html