Android MediaRouter Volume事件 [英] Android MediaRouter Volume events
本文介绍了Android MediaRouter Volume事件的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我想在投射时实现在YouTube应用中看到的音量变化,例如应用是在后台还是在锁定屏幕上
I want to implement volume change as seen in Youtube app while casting, like if app is in background or on lock screen
private void createSession() {
ComponentName receiver = new ComponentName(getPackageName(), RemoteReceiver.class.getName());
mediaSession = new MediaSessionCompat(this, "PlayerService", receiver, null);
mediaSession.setFlags(MediaSessionCompat.FLAG_HANDLES_MEDIA_BUTTONS |
MediaSessionCompat.FLAG_HANDLES_TRANSPORT_CONTROLS);
mediaSession.setPlaybackState(new PlaybackStateCompat.Builder()
.setState(PlaybackStateCompat.STATE_PLAYING, 0, 1f)
.setActions(PlaybackStateCompat.ACTION_PLAY_PAUSE)
.build());
AudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audioManager.requestAudioFocus(new AudioManager.OnAudioFocusChangeListener() {
@Override
public void onAudioFocusChange(int focusChange) {
// Ignore
}
}, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN);
mediaSession.setActive(true);
mediaRouter = MediaRouter.getInstance(this);
mediaRouter.setMediaSessionCompat(mediaSession);
}
现在我得到的滑块就像上面的图片一样,它对音量按钮做出了响应,但是我的广播接收器没有收到变化.
Now I get the slider just like Image above and it responds to volume buttons, but I dont receive change in my broadcast receiver.
推荐答案
您要做的就是创建一个 MediaSessionCompat
和一个 VolumeProviderCompat
.
All you have to do is create a MediaSessionCompat
with a VolumeProviderCompat
.
// Here is a volume provider which sets the volume of a remote route.
// Extend VolumeProviderCompat with your own implementation.
public static class RemoteVolume extends VolumeProviderCompat {
public RemoteVolume(MediaRouter.RouteInfo routeInfo) {
super(VolumeProviderCompat.VOLUME_CONTROL_ABSOLUTE, STEPS, 0);
this.stepSize = routeInfo.getVolumeMax() / STEPS;
this.routeInfo = routeInfo;
}
@Override
public void onSetVolumeTo(int volume) {
routeInfo.requestSetVolume(volume * stepSize);
setCurrentVolume(volume);
}
@Override
public void onAdjustVolume(int delta) {
int newVolume = getCurrentVolume() + delta;
routeInfo.requestSetVolume(newVolume * stepSize);
setCurrentVolume(newVolume);
}
}
然后,将 VolumeProviderCompat
连接到您的 MediaSessionCompat
:
MediaSessionCompat session = new MediaSessionCompat(context, TAG);
// might need some of these flags
session.setFlags(MediaSessionCompat.FLAG_HANDLES_MEDIA_BUTTONS |
MediaSessionCompat.FLAG_HANDLES_TRANSPORT_CONTROLS |
MediaSessionCompat.FLAG_HANDLES_QUEUE_COMMANDS);
// the volume buttons are routed to this session when it is
// active and currently playing
session.setPlaybackState(new PlaybackStateCompat.Builder()
.setState(PlaybackStateCompat.STATE_PLAYING, 0, 1.0f)
.build());
session.setActive(true);
// The media router tries to bind its own VolumeProvider which kinda
// works. We need to unbind the one provided and put ours in.
router.setMediaSessionCompat(session);
session.setPlaybackToRemote(new RemoteVolume(myRemoteRoute));
这篇关于Android MediaRouter Volume事件的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
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