Android禁用黑屏

Question

我需要禁用锁定屏幕，同时禁用黑屏.. 我需要在我的服务的onStart中执行此操作。

通过这个禁用锁定屏幕，这很有效：

KeyguardManager keyguardManager = (KeyguardManager)getSystemService(Activity.KEYGUARD_SERVICE);
        KeyguardLock lock = keyguardManager.newKeyguardLock(KEYGUARD_SERVICE);
            lock.disableKeyguard();

如何禁用黑屏？ 我试过这个但是不行......

PowerManager pm2 = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
       PowerManager.WakeLock wakel = pm2.newWakeLock(PowerManager.FULL_WAKE_LOCK, "AttvaSchermo");
       wakel.acquire();

或活动..

getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

提前感谢！