如何在我的活动中实现这个（MyCountDownTimer）抽象类？

Question

我是初学者，所以不需要向我提问。我有一个活动，当按下某个按钮时，它会在ontick（）方法中增加时间。如果单击该按钮，则时间从以下位置更改：

Time left :5 sec

以

Time left :7 sec

如何使用此类实现CountDown计时器的增量？

类别：

public abstract class MyCountDownTimer {

private CountDownTimer cdt;
private long millisInFuture;
private long countDownInterval;

public MyCountDownTimer(long millisInFuture, long countDownInterval) {
    this.millisInFuture = millisInFuture;
    this.countDownInterval = countDownInterval;

    recreateCounter(millisInFuture, countDownInterval);
}

public abstract void onFinish();

public abstract void onTick(long millisUntilFinished);

public void start(){
    cdt.start();
}

private void setMillisInFuture(long millisInFuture){
    this.millisInFuture = millisInFuture;
}

public void onIncrement(long millis){
    millisInFuture += millis;
    recreateCounter(millisInFuture, countDownInterval);
}

private void recreateCounter(long millisInFuture, long countDownInterval){
    if(cdt != null){
        try {
            cdt.cancel();
        } catch (Exception e) {
        }
    }

    cdt = new CountDownTimer(millisInFuture, countDownInterval) {

        @Override
        public void onTick(long millisUntilFinished) {
            setMillisInFuture(millisUntilFinished);
            MyCountDownTimer.this.onTick(millisUntilFinished);
        }

        @Override
        public void onFinish() {
            MyCountDownTimer.this.onFinish();
        }
    };
  }
}

非常感谢帮助！