我在Android中从播放列表中检索歌曲时遇到问题。我目前正在尝试使用以下代码实现此目的(基于here给出的这个问题的答案):
String where = MediaStore.Audio.Playlists._ID
+ "=?";
String whereVal[] = {id};
String[] proj =
{
MediaStore.Audio.Playlists.Members.AUDIO_ID,
MediaStore.Audio.Playlists.Members.ARTIST,
MediaStore.Audio.Playlists.Members.TITLE,
MediaStore.Audio.Playlists.Members._ID
};
Cursor mCursor = getActivity().getContentResolver().query(
MediaStore.Audio.Playlists.Members.getContentUri("external", Long.parseLong(id)),
proj, where, whereVal, null);
其中id是我使用cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Playlists._ID));
检索的播放列表ID(我知道这是正确的)
但是这会导致以下错误:
07-06 19:35:02.496: E/AndroidRuntime(8818): android.database.sqlite.SQLiteException:
ambiguous column name: _id (code 1): , while compiling: SELECT audio_id, artist, title,
audio_playlists_map._id AS _id FROM audio_playlists_map, audio WHERE (audio._id =
audio_id AND playlist_id=?) AND (_id=?)
我有一种有趣的感觉,问题在于以下几点:
String where = MediaStore.Audio.Playlists._ID + "=?";
但我不知道如何纠正它。
答案 0 :(得分:1)
您不需要where子句,因为您已经使用了播放列表的内容URI。我会试试这个:
Cursor mCursor = getActivity().getContentResolver().query(
MediaStore.Audio.Playlists.Members.getContentUri("external", Long.parseLong(id)),
proj, null, null, null);