Read headset state from audio manager instead of calculating ourselves.

        @Override

        public void onReceive(Context context, Intent intent) {

            if (intent.getAction().equals(Intent.ACTION_HEADSET_PLUG)) {

                boolean isPluggedIn = intent.getIntExtra("state", 0) == 1;

                boolean isPluggedIn = mAudioManager.isWiredHeadsetOn();

                Log.v(WiredHeadsetManager.this, "ACTION_HEADSET_PLUG event, plugged in: %b",

                        isPluggedIn);

                onHeadsetPluggedInChanged(isPluggedIn);

    }

    private final WiredHeadsetBroadcastReceiver mReceiver;

    private final AudioManager mAudioManager;

    private boolean mIsPluggedIn;

    /**

     * ConcurrentHashMap constructor params: 8 is initial table size, 0.9f is

    WiredHeadsetManager(Context context) {

        mReceiver = new WiredHeadsetBroadcastReceiver();

        AudioManager audioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);

        mIsPluggedIn = audioManager.isWiredHeadsetOn();

        mAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);

        mIsPluggedIn = mAudioManager.isWiredHeadsetOn();

        // Register for misc other intent broadcasts.

        IntentFilter intentFilter = new IntentFilter(Intent.ACTION_HEADSET_PLUG);