好吧，开始 android 应用程序开发真是太好了。
但是现在发生了一些新的事情！
在用户没有显示任何活动后，该应用程序正在被操作系统强制关闭
它以它而闻名的东西......
现在这只发生在这个屏幕上，而不是主活动屏幕
我已经使用 ListView 这个播放列表活动
现在 - 我想允许屏幕变暗，不禁用它！同时将应用程序保存在内存中！有人能告诉我怎么做吗
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_playlist);
// Show the Up button in the action bar.
setupActionBar();
ListView playlistView = (ListView)findViewById(R.string.playlistHolder);
String[] STAR = { "*" };
Uri allsongsuri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
String selection = MediaStore.Audio.Media.IS_MUSIC + " != 0";
@SuppressWarnings("deprecation")
Cursor cursor = managedQuery(allsongsuri, STAR, selection, null, null);
File musicstorage = new File("assets/music.xml");
// Create the array list of to do items
ArrayList<String> playItems = new ArrayList<String>();
// Create the array adapter to bind the array to the listview
ArrayAdapter<String> aa;
aa = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,playItems);
// Bind the array adapter to the listview.
playlistView.setAdapter(aa);
if (cursor != null)
{
if (cursor.moveToFirst())
{
do
{
String song_name = cursor.getString(cursor
.getColumnIndex(MediaStore.Audio.Media.DISPLAY_NAME));
int song_id = cursor.getInt(cursor
.getColumnIndex(MediaStore.Audio.Media._ID));
String fullpath = cursor.getString(cursor
.getColumnIndex(MediaStore.Audio.Media.DATA));
String album_name = cursor.getString(cursor
.getColumnIndex(MediaStore.Audio.Media.ALBUM));
int album_id = cursor.getInt(cursor
.getColumnIndex(MediaStore.Audio.Media.ALBUM_ID));
String artist_name = cursor.getString(cursor
.getColumnIndex(MediaStore.Audio.Media.ARTIST));
int artist_id = cursor.getInt(cursor
.getColumnIndex(MediaStore.Audio.Media.ARTIST_ID));
playItems.add(0, song_name);
aa.notifyDataSetChanged();
} while (cursor.moveToNext());
}
cursor.close();
}
}