Question

我正在尝试更新自按下按钮后经过的时间的文本视图，以下是我的代码：

      public void startTimeCounter() {
        tripTimeCounter = new CountDownTimer(60 * 1000, 1000) {

        @Override
        public void onFinish() {
            // TODO Auto-generated method stub
            repeatCounter = repeatCounter + 1;
            startTimeCounter();
        }

        @Override
        public void onTick(long millisUntilFinished) {
            // TODO Auto-generated method stub
            timedisplay = (TextView) findViewById(R.id.textView3);
            timedisplay.setText(formatInterval((repeatCounter * 60) * 1000
                    - millisUntilFinished));

        }

    }.start();
}

private static String formatInterval(final long l) {
    final long hr = TimeUnit.MILLISECONDS.toHours(l);
    final long min = TimeUnit.MILLISECONDS.toMinutes(l
            - TimeUnit.HOURS.toMillis(hr));
    final long sec = TimeUnit.MILLISECONDS.toSeconds(l
            - TimeUnit.HOURS.toMillis(hr) - TimeUnit.MINUTES.toMillis(min));
    final long ms = TimeUnit.MILLISECONDS.toMillis(l
            - TimeUnit.HOURS.toMillis(hr) - TimeUnit.MINUTES.toMillis(min)
            - TimeUnit.SECONDS.toMillis(sec));
    return String.format("%02d:%02d:%02d", hr, min, sec, 0);
}

计时器工作正常，但是当我第二次按下按钮时，文本视图中的值不会被清除，而是关联一个与前一个计时器并行运行的新时间，我可以看到上一次并反映新时间同时增加。我想知道在第二次调用startTimeCounter（）之前我将如何清除先前的状态;

按钮单击代码：

   private View.OnClickListener but = new View.OnClickListener() {

    @Override
    public void onClick(View v) {
        if (isOnline() == true) {
            // PHP();
            // network();

            startTimeCounter();
        } else {
            Toast.makeText(getApplicationContext(),
                    "Not connected to the internet", Toast.LENGTH_LONG)
                    .show();
        }
    }
};

Answer 1

试试这段代码：

公共类XXX {
private CountDownMine CountDown;

private class CountDownMine extends CountDownTimer 
{
    public CountDownMine(long millisInFuture, long countDownInterval) 
    {
        super(millisInFuture, countDownInterval);
    }

    @Override
    public void onFinish() 
    {
        //The same yours
    }

    @Override
    public void onTick(long millisUntilFinished) 
    {
        //The same yours
    }   
}


private View.OnClickListener but = new View.OnClickListener() 
{
    @Override
public void onClick(View v) 
{
        if (isOnline() == true) 
        {
            //Code  

    if(CountDown != null)
        CountDown.cancel();

    CountDown = new CountDownMine(60 * 1000, 1000);
    CountDown.start();
    } 
    else 
    {
        //Code
    }
    }
};

}

Answer 2

       public void onFinish() {
            // TODO Auto-generated method stub
            repeatCounter = repeatCounter + 1;
            startTimeCounter();
        }

您每次new counter或previous one finishes都会创建button is clicked。那就是问题所在。将CountDownTimer实例保留在startTimeCounter方法之外，并尝试将其传递给startTimeCounter(CountDownTimer tripTimeCounter)并重新启动计时器onFinish（），

        public void onFinish() {
            // TODO Auto-generated method stub
            repeatCounter = repeatCounter + 1;
            this.start();
            }

编辑：

private View.OnClickListener but = new View.OnClickListener() {

        tripTimeCounter = new CountDownTimer(60 * 1000, 1000) {

        @Override
        public void onFinish() {
            // TODO Auto-generated method stub
            repeatCounter = repeatCounter + 1;
            startTimeCounter();
        }

        @Override
        public void onTick(long millisUntilFinished) {
            // TODO Auto-generated method stub
            timedisplay = (TextView) findViewById(R.id.textView3);
            timedisplay.setText(formatInterval((repeatCounter * 60) * 1000
                    - millisUntilFinished));

        }

    };

    @Override
    public void onClick(View v) {
        if (isOnline() == true) {
            // PHP();
            // network();

            tripTimeCounter.start();
        } else {
            Toast.makeText(getApplicationContext(),
                    "Not connected to the internet", Toast.LENGTH_LONG)
                    .show();
        }
    }
};

Answer 3

每次调用CountDownTimer时，您都在创建新的startTimeCounter。改为重新启动前一个：

// Initializing the timer earier
CountdownTimer tripTimeCounter = new CountDownTimer(60 * 1000, 1000) {
    ...
}

计时器启动方法变为：

public void startTimeCounter() {
    tripTimeCounter.cancel();
    tripTimeCounter.start();
}

之前的计时器状态未清除

3 个答案:

编辑：