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- public class ListViewLoader extends ListActivity
- implements LoaderManager.LoaderCallbacks<Cursor> {
- // This is the Adapter being used to display the list's data
- SimpleCursorAdapter mAdapter;
- // These are the Contacts rows that we will retrieve
- static final String[] PROJECTION = new String[] {ContactsContract.Data._ID,
- ContactsContract.Data.DISPLAY_NAME};
- // This is the select criteria
- static final String SELECTION = "((" +
- ContactsContract.Data.DISPLAY_NAME + " NOTNULL) AND (" +
- ContactsContract.Data.DISPLAY_NAME + " != '' ))";
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- // Create a progress bar to display while the list loads
- ProgressBar progressBar = new ProgressBar(this);
- progressBar.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
- LayoutParams.WRAP_CONTENT, Gravity.CENTER));
- progressBar.setIndeterminate(true);
- getListView().setEmptyView(progressBar);
- // Must add the progress bar to the root of the layout
- ViewGroup root = (ViewGroup) findViewById(android.R.id.content);
- root.addView(progressBar);
- // For the cursor adapter, specify which columns go into which views
- String[] fromColumns = {ContactsContract.Data.DISPLAY_NAME};
- int[] toViews = {android.R.id.text1}; // The TextView in simple_list_item_1
- // Create an empty adapter we will use to display the loaded data.
- // We pass null for the cursor, then update it in onLoadFinished()
- mAdapter = new SimpleCursorAdapter(this,
- android.R.layout.simple_list_item_1, null,
- fromColumns, toViews, 0);
- setListAdapter(mAdapter);
- // Prepare the loader. Either re-connect with an existing one,
- // or start a new one.
- getLoaderManager().initLoader(0, null, this);
- }
- // Called when a new Loader needs to be created
- public Loader<Cursor> onCreateLoader(int id, Bundle args) {
- // Now create and return a CursorLoader that will take care of
- // creating a Cursor for the data being displayed.
- return new CursorLoader(this, ContactsContract.Data.CONTENT_URI,
- PROJECTION, SELECTION, null, null);
- }
- // Called when a previously created loader has finished loading
- public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
- // Swap the new cursor in. (The framework will take care of closing the
- // old cursor once we return.)
- mAdapter.swapCursor(data);
- }
- // Called when a previously created loader is reset, making the data unavailable
- public void onLoaderReset(Loader<Cursor> loader) {
- // This is called when the last Cursor provided to onLoadFinished()
- // above is about to be closed. We need to make sure we are no
- // longer using it.
- mAdapter.swapCursor(null);
- }
- @Override
- public void onListItemClick(ListView l, View v, int position, long id) {
- // Do something when a list item is clicked
- }
- }
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