我正在尝试从MediaStore
中获取专辑信息。我可以很容易地获取名称和艺术家,但由于某种原因,当我尝试访问ALBUM_ID
列时,它会给我一个错误。
Caused by: java.lang.IllegalStateException: Couldn't read row 0, col -1 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it.
at android.database.CursorWindow.nativeGetString(Native Method)
at android.database.CursorWindow.getString(CursorWindow.java:450)
at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:51 )
at android.database.CursorWrapper.getString(CursorWrapper.java:114)
at sage.musicplayer.MainActivity.getAlbumList(MainActivity.java:1540)
at sage.musicplayer.MainActivity.onCreate(MainActivity.java:238)
我似乎找不到解决方案。欢迎任何帮助!下面是我用来获取专辑信息并将其添加到 ArrayList 中的方法。
public ArrayList<Album> getAlbumList() {
ArrayList<Album> temp = new ArrayList<>();
/*String[] proj = {MediaStore.Audio.Albums.ALBUM_ID,
MediaStore.Audio.Albums.ARTIST,
MediaStore.Audio.Albums.ALBUM,
MediaStore.Audio.Albums.NUMBER_OF_SONGS
};*/
Cursor albumCursor = getContentResolver().query(MediaStore.Audio.Albums.EXTERNAL_CONTENT_URI, null, null, null, null);
if(albumCursor != null && albumCursor.moveToFirst()) {
int albumName = albumCursor.getColumnIndex(MediaStore.Audio.Albums.ALBUM);
int albumArtist = albumCursor.getColumnIndex(MediaStore.Audio.Albums.ARTIST);
int albumID = albumCursor.getColumnIndex(MediaStore.Audio.Albums.ALBUM_ID);
do {
String thisAlbumName = albumCursor.getString(albumName);
String thisAlbumArtist = albumCursor.getString(albumArtist);
String thisAlbumID = albumCursor.getString(albumID);//this line is giving me an error
temp.add(new Album(thisAlbumName, thisAlbumArtist, thisAlbumID));
}while(albumCursor.moveToNext());
}
return temp;
}
Log.d
记录它们。 - pskink