Retrieving Media from a Content Resolver

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在设备中查找音乐：

ContentResolver contentResolver= getContentResolver();
Uri uri= android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
Cursor cursor= contentResolver.query(uri,null, null, null, null);
if(cursor ==null) {
// query failed, handle error.
} else if(!cursor.moveToFirst()){
// no media on the device
} else {
int titleColumn= cursor.getColumnIndex(android.provider.MediaStore.Audio.Media.TITLE);
int idColumn= cursor.getColumnIndex(android.provider.MediaStore.Audio.Media._ID);
do{
long thisId= cursor.getLong(idColumn);
String thisTitle= cursor.getString(titleColumn);
// ...process entry...
}while (cursor.moveToNext());
}

在MediaPlayer中使用它：

long id = /* retrieve it from somewhere */;Uri contentUri = ContentUris.withAppendedId(        android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, id);mMediaPlayer = new MediaPlayer();mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);mMediaPlayer.setDataSource(getApplicationContext(), contentUri);// ...prepare and start...