[英]Android: saving checkbox-state of ListView items into instances of custom object
[英]saving checkbox state in listview in android?
我正在从手机中获取播放列表,并在列表视图中显示我的歌曲以及多个复选框。.现在,我需要保存复选框的状态,当用户再次启动该应用程序时,该复选框的状态将重新加载。您能建议这样做吗?
从系统播放列表中提取歌曲...我编写的代码是:
ListView list = (ListView) findViewById(R.id.songlist);
String[] projection = { MediaStore.Audio.Playlists.Members._ID,
MediaStore.Audio.Playlists.Members.TITLE,
MediaStore.Audio.Playlists.Members.DATA,
MediaStore.Audio.Playlists.Members.AUDIO_ID,
MediaStore.Audio.Playlists.Members.ARTIST };
Cursor cursor = managedQuery(
// 1 is the id of playlist MediaStore.Audio.Playlists.Members.getContentUri("external", 1), projection,
MediaStore.Audio.Media.IS_MUSIC + " != 0 ", null, null);
SimpleCursorAdapter a = new SimpleCursorAdapter(this, R.layout.list_item, cursor,
new String[] { MediaStore.Audio.Playlists.Members.TITLE }, new int[] { R.id.checkbox });
this.setListAdapter(a);
list.setAdapter(a);
您可以覆盖Activity的onDestroy
方法,将适配器的内容保存到文件中。 有关如何保存到文件的参考,请参见http://developer.android.com/guide/topics/data/data-storage.html 。 您可以使用SimpleAdapter上的getItem(int position)
轻松访问adapater的内容。
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