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[英]Android: saving checkbox-state of ListView items into instances of custom object
[英]saving checkbox state in listview in android?
我正在從手機中獲取播放列表,並在列表視圖中顯示我的歌曲以及多個復選框。.現在,我需要保存復選框的狀態,當用戶再次啟動該應用程序時,該復選框的狀態將重新加載。您能建議這樣做嗎?
從系統播放列表中提取歌曲...我編寫的代碼是:
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);
您可以覆蓋Activity的onDestroy
方法,將適配器的內容保存到文件中。 有關如何保存到文件的參考,請參見http://developer.android.com/guide/topics/data/data-storage.html 。 您可以使用SimpleAdapter上的getItem(int position)
輕松訪問adapater的內容。
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