public class ContactsActivity extends Activity implements LoaderManager.LoaderCallbacks<Cursor> {

  GridView gridview;
  SimpleCursorAdapter adapter;
    	
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    
    gridview = (GridView)findViewById(R.id.contacts_grid_view);
    String[] projections = new String[] {Contacts.DISPLAY_NAME};
    int[] views = new int[] {android.R.id.text1}; 
    adapter = new SimpleCursorAdapter(this, android.R.layout.simple_list_item_1, null, projections, views, 0);
    gridview.setAdapter(adapter);
    getLoaderManager().initLoader(0, null, this);
  }
	
  public Loader<Cursor> onCreateLoader(int id, Bundle data) {
    return new CursorLoader(this, Contacts.CONTENT_URI, null, null, null, Contacts.DISPLAY_NAME);
  }
	
  public void onLoadFinished(Loader<Cursor> loader, Cursor cursor) {
    adapter.swapCursor(cursor);	
  }
	
  public void onLoaderReset(Loader<Cursor> loader) {
    adapter.swapCursor(null);
  }
}