如何在libGdx中设置跨多个用途的跨媒体广告之间的时间间隔

我正在制作一个简单的Ketchapp风格的游戏，我想在玩家死后出现一个插播广告

public class GameOverAd {
    private static final int RESET = -1;

    private static long startTime = RESET;
    private static long currentTime;
    private static int secondsPassedSinceLastAd;

    public GameOverAd(){
        if (startTime == RESET){
            startTime = System.currentTimeMillis();
            //first time showOrLoadInterstitial() runs it will load the ad
            //second time showOrLoadInterstitial() runs it will show the ad
            GameMain.handler.showOrLoadInterstitial();//loads
        }
    }

    public void adCheck(){
        currentTime = System.currentTimeMillis();
        secondsPassedSinceLastAd = (int)((currentTime - startTime) /1000);
        if(secondsPassedSinceLastAd >= 20){//seconds between ads
            showAd();
        }
        else{

        }
    }

    public void showAd(){
        GameMain.handler.showOrLoadInterstitial();//shows add
        startTime = RESET;
    }
}

这是我当前使用的类，构造函数在游戏开始时使用，adCheck方法在玩家死亡时运行

public class GameOverAd {
    private static final int RESET = -1;

    private static long startTime = RESET;
    private static long currentTime;
    private static int secondsPassedSinceLastAd;

    public GameOverAd(){
        if (startTime == RESET){
            startTime = System.currentTimeMillis();
            //first time showOrLoadInterstitial() runs it will load the ad
            //second time showOrLoadInterstitial() runs it will show the ad
            GameMain.handler.showOrLoadInterstitial();//loads
        }
    }

    public void adCheck(){
        currentTime = System.currentTimeMillis();
        secondsPassedSinceLastAd = (int)((currentTime - startTime) /1000);
        if(secondsPassedSinceLastAd >= 20){//seconds between ads
            showAd();
        }
        else{

        }
    }

    public void showAd(){
        GameMain.handler.showOrLoadInterstitial();//shows add
        startTime = RESET;
    }
}

---

只要玩家不关闭应用程序，此代码就可以正常工作，当玩家死亡时，使用250秒后会显示一个add，但问题是，如果播放器在249秒后退出，计时器将重置，用户将永远看不到广告。我如何使计时器从停止计时的同一位置继续计数？

你必须在关闭时保存剩余时间，并在应用程序启动时重新读取。我建议为此使用Preferences类