我有一个Activity
包含项目列表的家庭音频应用程序。用户选择一个项目,我将一个 ID 传递给另一个Activity
具有控件(播放/暂停/音量等)的项目。音频播放以MediaBrowserService
. 我需要检测用户选择的项目当前是否正在播放,但我无法弄清楚如何将 ID 保存在本地存储(SharedPrefs 或 SQlite)中。
我将项目的 ID 从第二个Activity
传递到MediaBrowserService
a Bundle
。我以为我可以在第二次Activity
使用时检索 ID,getExtras()
但它总是返回 0 或 null,具体取决于我使用的代码(见下文)。
我不反对使用本地存储,但似乎应该有更好的方法。这是我到目前为止所拥有的:
public class EpisodeActivity extends Activity {
private MediaBrowserCompat mMediaBrowserCompat;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
final Bundle extras = new Bundle();
extras.putInt("episodeid", getIntent().getExtras().getInt("episodeid")); //passed in from Home Activity
mMediaBrowserCompat = new MediaBrowserCompat(
this,
new ComponentName(this, MediaPlayerService.class),
mMediaBrowserCompatConnectionCallback,
extras
);
mPlayButton.setOnClickListener(view -> {
final Bundle extras = new Bundle();
extras.putInt("episodeid", getIntent().getExtras().getInt("episodeid")); //passed in from Home Activity
String url = "http://www.example.com/media.mp3"
MediaControllerCompat.getMediaController(mActivity).getTransportControls().playFromUri(Uri.parse(uri), extras);
});
if (MediaControllerCompat.getMediaController(mActivity).getPlaybackState() != null &&
MediaControllerCompat.getMediaController(mActivity).getPlaybackState().getState() == PlaybackStateCompat.STATE_PLAYING) {
int episodeID = mMediaBrowserCompat.getExtras().getInt("episodeid"); //always returns 0
//also tried this but getExtras is null
int episodeID = MediaControllerCompat.getMediaController(mActivity).getExtras().getInt("episodeid");
}
}
}
public class MediaPlayerService extends MediaBrowserServiceCompat {
private MediaSessionCompat mMediaSessionCompat;
@Override
public void onCreate() {
super.onCreate();
final ComponentName mediaButtonReceiver = new ComponentName(getApplicationContext(), MediaButtonReceiver.class);
mMediaSessionCompat = new MediaSessionCompat(getApplicationContext(), getString(R.string.app_name), mediaButtonReceiver, null);
mMediaSessionCompat.setCallback(mMediaSessionCallback);
...
}
private MediaSessionCompat.Callback mMediaSessionCallback = new MediaSessionCompat.Callback() {
@Override
public void onPlayFromUri(final Uri uri, final Bundle extras) {
super.onPlayFromUri(uri, extras);
int episodeId = extras.getInt("episodeid");
String url = GetUrl(episodeId);
mMediaPlayer = new MediaPlayer();
mMediaPlayer.setDataSource(uri);
mMediaPlayer.prepareAsync();
...
}
}
}