如何在Android中的一段时间内打开/关闭屏幕背光如闪烁？

Question

是否有可能在30秒内打开和关闭设备的屏幕背光，使其看起来像闪烁的屏幕？

public class blinking extends TimerTask {
@Override
public void run() {
    PowerManager powerMan = (PowerManager) *getSystemService*(Context.POWER_SERVICE);
    PowerManager.WakeLock wakeLock = powerMan.newWakeLock(
            PowerManager.SCREEN_DIM_WAKE_LOCK |
                    PowerManager.ACQUIRE_CAUSES_WAKEUP, "wakelockTag");

    boolean screenOn = false;
    for (int i = 0; i < 30; i++) {
        if (screenOn) {
            wakeLock.acquire();
            screenOn = false;
        } else {
            wakeLock.release();
            screenOn = true;
        }
    }
}
}

在我的Activity类中使用此代码（用于调用Blinking类）：

Timer mTimer = new Timer();
mTimer.schedule( new blinking(), 30000 );   

Answer 1

在班上试试这个：

创建电源管理器参数

PowerManager powerMan = (PowerManager) getSystemService(Context.POWER_SERVICE);
PowerManager.WakeLock wakeLock = powerMan.newWakeLock(
                     PowerManager.SCREEN_DIM_WAKE_LOCK | 
                     PowerManager.ACQUIRE_CAUSES_WAKEUP, "wakelockTag");

调用计时器

Timer timer = new Timer(); 
timer.schedule( new FlashingTimerTask(), 30000 );

对于Timer任务：

public class FlashingTimerTask extends TimerTask{

    @Override
    public void run() {
            boolean screenOn = false;
            for (int i = 0; i < 30; i++) {
                if (screenOn) {
                    wakeLock.acquire();
                    screenOn = false;
                } else {
                    wakeLock.release();
                    screenOn = true;
                }
            }
    }
}