如何在Oreo中为媒体按钮注册广播接收器? [英] How register Broadcast Receiver for media button in Oreo?

问题描述

我对新的Android版本(8.0(奥利奥))有疑问. 我必须注册一个广播，并使用以下代码进行此操作:

I have a problem with the new Android version, that is 8.0 (Oreo). I have to register a broadcast and I do this with this code:

// android.intent.action.MEDIA_BUTTON
IntentFilter filter = new IntentFilter(Intent.ACTION_MEDIA_BUTTON);
r = new MediaButtonIntentReceiver();
// this line sets receiver priority
filter.setPriority(999);
registerReceiver(r, filter);

这在较旧的Android版本上有效，但在Android 8上却无效，因为有必要注册显式广播，但我不知道如何操作. 如何注册显式广播以检测媒体按钮?

This works on older Android version but on Android 8 this doesn't work because it is necessary register explicit broadcast but I don't know how. How can I register explicit broadcast to detect media button?

这在Manifest.xml中:

This is in Manifest.xml:

<receiver android:name=".MediaButtonIntentReceiver">
    <intent-filter android:priority="999">
        <action android:name="android.intent.action.MEDIA_BUTTON" />
    </intent-filter>
</receiver>

推荐答案

如果要接收媒体按钮，则必须播放音频并使用mediasession.

If you want to receive media button, you have to play audio and use mediasession.

i.g

    MediaSession ms = new MediaSession(getApplicationContext(), getPackageName());
    ms.setActive(true);

    ms.setCallback(new MediaSession.Callback() {
        @Override
        public boolean onMediaButtonEvent(Intent mediaButtonIntent) {
            Log.e("hmhm", "hmhm media button");
            return super.onMediaButtonEvent(mediaButtonIntent);
        }
    });

    // you can button by receiver after terminating your app
    ms.setMediaButtonReceiver(mbr); 

    // play dummy audio
    AudioTrack at = new AudioTrack(AudioManager.STREAM_MUSIC, 48000, AudioFormat.CHANNEL_OUT_STEREO, AudioFormat.ENCODING_PCM_16BIT,
            AudioTrack.getMinBufferSize(48000, AudioFormat.CHANNEL_OUT_STEREO, AudioFormat.ENCODING_PCM_16BIT), AudioTrack.MODE_STREAM);
    at.play();

    // a little sleep 
    at.stop();
    at.release();

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