据我所知,这是飞利浦Android TV用户的常见问题(例如 this篇中的第22页,或 that讨论).
一般来说,您的任务的模板是跟踪插入/拔出事件和“系统/音乐”音频流(或媒体按钮按下)的音量的服务,而不是对“有线耳机”音频“流”进行相应的更改(没有这样的流在“标准”Android中,但显然
类似于 “Android Philips”级别的东西.问题是,似乎不可能只使用没有“飞利浦Android TV API”的Android SDK来改变音量“有线耳机”音频流级别(可能它不是公共的).

“VolumeTrackingService”的模板源代码可能是这样的：

public class VolumeTrackingService extends Service {

    private static final String TAG = VolumeTrackingService.class.getSimpleName();

    public static final String ACTION_START = "VolumeTrackingService.ACTION_START";
    public static final String ACTION_STOP = "VolumeTrackingService.ACTION_STOP";

    HeadsetPlugIntentReceiver mHeadsetPlugReceiver;
    private static boolean mHeadsetPlugged = false;

    private SettingsContentObserver mSettingsContentObserver;

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        mHeadsetPlugReceiver = new HeadsetPlugIntentReceiver();
        registerReceiver(mHeadsetPlugReceiver,new IntentFilter(Intent.ACTION_HEADSET_PLUG));
        mSettingsContentObserver = new SettingsContentObserver(new Handler());
        getApplicationContext().getContentResolver().registerContentObserver(android.provider.Settings.System.CONTENT_URI,true,mSettingsContentObserver);
    }

    @Override
    public void onDestroy() {
        getApplicationContext().getContentResolver().unregisterContentObserver(mSettingsContentObserver);
        unregisterReceiver(mHeadsetPlugReceiver);
        super.onDestroy();
    }

    @Override
    public int onStartCommand(Intent intent,int flags,int startId) {
        if (intent != null) {
            String actionRequested = intent.getAction();
            if (ACTION_START.equals(actionRequested)) {
            } else if (ACTION_STOP.equals(actionRequested)) {
                stopSelf();
            }
        }
        return START_STICKY;
    }

    private int getSystemVolumeInPercentage() {
        AudioManager audioManager = (AudioManager) getSystemService(Context.AUdio_SERVICE);
        final int streamVolumeMax = audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
        final int streamVolume = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);
        return 100 * streamVolume / streamVolumeMax;
    }

    private void setHeadphonesVolume(int volumeInPercentage) {
        // there should be magic of wired headphones volume level changing
    }

    private void processVolumeChanges() {
        if (mHeadsetPlugged) {
            int systemVolumeInPercentage = getSystemVolumeInPercentage();
            setHeadphonesVolume(systemVolumeInPercentage);
        }
    }


    public class SettingsContentObserver extends ContentObserver {

        public SettingsContentObserver(Handler handler) {
            super(handler);
        }

        @Override
        public boolean deliverSelfNotifications() {
            return super.deliverSelfNotifications();
        }

        @Override
        public void onChange(boolean selfChange) {
            super.onChange(selfChange);
            if (mHeadsetPlugged ) {
                processVolumeChanges();
            }
        }
    }

    public class HeadsetPlugIntentReceiver extends android.content.BroadcastReceiver {
        @Override
        public void onReceive(Context ctx,Intent intent) {
            if (intent.getAction().equals(android.media.AudioManager.ACTION_HEADSET_PLUG)) {
                mHeadsetPlugged = intent.getIntExtra("state",0) == 1;
            }
        }
    }
}

不幸的是,它没有解决主要问题：改变有线耳机的音量水平(如果没有“飞利浦Android TV API”,可能是不可能的).

但是如果你的环绕声系统有遥控器你可以做一些解决方法：在上述服务中模拟音响系统遥控器命令,并通过连接到飞利浦49PUS6401 Android TV的USB主机的红外加密狗发送.