Android 耳机按键与拔插监听

按键监听：

public class MyMediaButtonReceiver extends BroadcastReceiver{

    private AudioManager mAudioManger;
    @Override
    public void onReceive(Context context, Intent intent) {
        String intentAction = intent.getAction();

        if (AudioManager.ACTION_AUDIO_BECOMING_NOISY.equals(intentAction)) {//拔出耳机，将声音设为最大声音的1/3
            mAudioManger = (AudioManager)context.getSystemService(Context.AUDIO_SERVICE);
            int max = mAudioManger.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
            mAudioManger.setStreamVolume(AudioManager.STREAM_MUSIC,
                    max/3,
                    AudioManager.FLAG_PLAY_SOUND|AudioManager.FLAG_SHOW_UI);
        }
        else if (Intent.ACTION_MEDIA_BUTTON.equals(intentAction)) {
            KeyEvent event = (KeyEvent) intent.getParcelableExtra(Intent.EXTRA_KEY_EVENT);

            if (event == null) {
                return;
            }
            int keycode = event.getKeyCode();
            if(event.getAction()==KeyEvent.ACTION_DOWN){//只监听抬起事件
                abortBroadcast();
                return;
            }
            switch (keycode) {
                case KeyEvent.KEYCODE_MEDIA_STOP:

                    break;
                case KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE:
                case KeyEvent.KEYCODE_HEADSETHOOK:

                    break;
                case KeyEvent.KEYCODE_MEDIA_NEXT:
                    break;
                case KeyEvent.KEYCODE_MEDIA_PREVIOUS:
                    break;
                case KeyEvent.KEYCODE_MEDIA_PAUSE:

                    }
                    break;
                case KeyEvent.KEYCODE_MEDIA_PLAY:

                    break;
            }

        abortBroadcast();
        }
    }
}

在manifest中注册广播接受器

 <receiver android:name=".tools.MyMediaButtonReceiver" 
            android:exported="true"
            >
            <intent-filter android:priority="1000">
                <action android:name="android.media.AUDIO_BECOMING_NOISY"/>
                <action android:name="android.intent.action.MEDIA_BUTTON" />
            </intent-filter>
        </receiver>

最后在service中向AudioManger中注册此广播，否则不会收到广播

 mAudioManager =(AudioManager)getSystemService(Context.AUDIO_SERVICE);
        //构造一个ComponentName，指向MediaoButtonReceiver类  
        mbCN = new ComponentName(getPackageName(),MyMediaButtonReceiver.class.getName());
        //注册一个MedioButtonReceiver广播监听  
        mAudioManager.registerMediaButtonEventReceiver(mbCN);

耳机插入监听：必须是动态注册，否则收不到广播

IntentFilter filter = new IntentFilter();
        filter.addAction(Intent.ACTION_HEADSET_PLUG);
        registerReceiver(mBroadcast,filter);