我正在製作一個音樂播放器,我只是試圖使用ListFragment顯示藝術家名稱。下面是代碼:我正在使用ListFragment,但我在使用LoaderManager時遇到了一些問題
import android.app.ListFragment;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.MediaStore;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.LoaderManager;
import android.support.v4.content.CursorLoader;
import android.support.v4.content.Loader;
import android.support.v4.widget.CursorAdapter;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class AlbumsFragment extends ListFragment implements
LoaderManager.LoaderCallbacks <Cursor> {
AlbumsAdapter mAdapter;
@
Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View myFragmentView = inflater.inflate(R.layout.tabs_list, container, false);
return myFragmentView;
}
@
Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
mAdapter = new AlbumsAdapter(getActivity(), null);
setListAdapter(mAdapter);
getLoaderManager().initLoader(0, null, this);
}
static final String[] ALBUM_SUMMARY_PROJECTION = {
MediaStore.Audio.Albums._ID, MediaStore.Audio.Albums.ALBUM
};
public Loader <Cursor> onCreateLoader(int id, Bundle args) {
String select = null;
return new CursorLoader(getActivity(), MediaStore.Audio.Albums.EXTERNAL_CONTENT_URI, ALBUM_SUMMARY_PROJECTION, select, null, null);
}
public void onLoadFinished(Loader <Cursor> loader, Cursor data) {
mAdapter.swapCursor(data);
}
public void onLoaderReset(Loader <Cursor> loader) {
mAdapter.swapCursor(null);
}
}
我得到一個錯誤說: 方法initLoader(INT,捆綁,LoaderManager.LoaderCallbacks)在類型LoaderManager不適用於參數(INT,空,AlbumsFragment)
我試過,但它顯示錯誤說「方法getSupportLoaderManager()未定義的類型AlbumsFragment」 – max59