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[英]Loading a Cursor in Android with info from the MediaStore.Audio provider
[英]Unable to play MediaStore.Audio songs with MediaPlayer in android
我目前正在制作一个简单的音乐播放器,并且设法通过下面的示例脚本从媒体获取音乐列表。 但是,问题是我不知道如何播放ContentResolver中的音乐。 我已经阅读了http://developer.android.com/reference/android/provider/MediaStore.Audio.html,但很难理解。 有好的样本或教程吗? 我要做的就是播放Android中ContentResolver的音乐。
public Track(Cursor cursor)
{
id = cursor.getLong( cursor.getColumnIndex( MediaStore.Audio.Media._ID ));
path = cursor.getString( cursor.getColumnIndex(MediaStore.Audio.Media.DATA));
title = cursor.getString( cursor.getColumnIndex( MediaStore.Audio.Media.TITLE ));
album = cursor.getString( cursor.getColumnIndex( MediaStore.Audio.Media.ALBUM ));
artist = cursor.getString( cursor.getColumnIndex( MediaStore.Audio.Media.ARTIST ));
albumId = cursor.getLong( cursor.getColumnIndex( MediaStore.Audio.Media.ALBUM_ID ));
artistId = cursor.getLong( cursor.getColumnIndex( MediaStore.Audio.Media.ARTIST_ID ));
duration = cursor.getLong( cursor.getColumnIndex( MediaStore.Audio.Media.DURATION ));
trackNo = cursor.getInt( cursor.getColumnIndex( MediaStore.Audio.Media.TRACK ));
uri = ContentUris.withAppendedId(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, id);
}
public static List getItems(Context activity) {
List tracks = new ArrayList();
ContentResolver resolver = activity.getContentResolver();
Cursor cursor = resolver.query(
MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
Track.COLUMNS,
null,
null,
null
);
while( cursor.moveToNext() ){
if( cursor.getLong(cursor.getColumnIndex( MediaStore.Audio.Media.DURATION)) < 3000 ){continue;}
tracks.add(new Track(cursor));
}
cursor.close();
return tracks;
}
这是Google提供的文档,我引用:
在媒体播放器应用程序中可能有用的另一个功能是能够检索用户在设备上拥有的音乐。 您可以通过查询ContentResolver外部媒体来实现:
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());
}
要将其与MediaPlayer一起使用,可以执行以下操作:
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...
来源: 媒体播放:从内容解析器检索媒体
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