在我的列表视图没有填充数据库数据时,有什么更好的方法来显示进度指示器？
我找到了一些使用assynctask的方法,但在我的例子中,我使用的是Loader / CursorLoader.
- public class TestActivity extends SherlockFragmentActivity implements
- LoaderCallbacks<Cursor> {
- SimpleCursorAdapter mAdapter;
- ListView mListView;
- private static final String[] UI_BINDING_FROM = new String[] {
- TestDBAdapter.KEY_NAME,TestDBAdapter.KEY_ICON };
- private static final int[] UI_BINDING_TO = new int[] { R.id.text,R.id.icon };
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_Test);
- mListView = (ListView) findViewById(R.id.listview);
- mAdapter = new TestAdapter(getApplicationContext(),R.layout.list_item_Test,null,UI_BINDING_FROM,UI_BINDING_TO,0);
- mListView.setAdapter(mAdapter);
- getSupportLoaderManager().initLoader(0,this);
- }
- @Override
- public Loader<Cursor> onCreateLoader(int id,Bundle args) {
- Uri uri = ContentProviderTest.CONTENT_URI;
- CursorLoader cursorLoader = new CursorLoader(
- this,uri,null);
- return cursorLoader;
- }
- @Override
- public void onLoadFinished(Loader<Cursor> loader,Cursor data) {
- mAdapter.swapCursor(data);
- }
- @Override
- public void onLoaderReset(Loader<Cursor> loader) {
- mAdapter.swapCursor(null);
- }
- }
一个可能的解决方案是创建一个扩展ListFragment的新类并使用setListShown()方法,但我不知道它是否是解决此问题的最佳方法.
谢谢
