我有一个音频应用,其家Activity
包含一个项目列表。用户选择一个项目,然后将ID传递给另一个具有控件(播放/暂停/音量等)的Activity
。音频播放被传送到MediaBrowserService
。我需要检测用户选择的项目当前是否正在播放,但是我无法弄清楚将ID保存在本地存储(SharedPrefs或SQlite)之外的方式。
我通过Activity
将项目的ID从第二个MediaBrowserService
传递到Bundle
。我以为我可以使用Activity
在第二个getExtras()
中检索ID,但它始终返回0或null,这取决于我使用的代码(请参见下文)。
我不反对使用本地存储,但似乎应该有更好的方法。这是我到目前为止的内容:
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();
...
}
}
}
我有一个音频应用,其家庭活动包含项目列表。用户选择一个项目,然后将ID传递给另一个具有控件(播放/暂停/音量等)的Activity。音频...
media_controller.getMetadata()。getDescription()。getMediaId()可能就是您想要的。如果没有,也许尝试使用MediaMetadataCompat.Builder()为每个情节设置一些元数据