距离感应器黑屏，如何一直亮屏

onCreate
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD);
        ......
    }

@Override
    protected void onStart() {
        super.onStart();
        Log.d(TAG,"onStart()");
        final PowerManager powerManager = Quantum6Telecom.getPowerManager();
        if (powerManager != null && mWakeLock == null){
            try
            {
                //PROXIMITY_SCREEN_OFF_WAKE_LOCK
                mWakeLock = powerManager.newWakeLock(PowerManager.ON_AFTER_RELEASE | PowerManager.SCREEN_BRIGHT_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP, TAG);
                if (mWakeLock != null){
                    mWakeLock.acquire();
                }
            }
            catch (Exception e)
            {
                //
            }
        }
        ......
    }