在Android中使进度条倒数计时器“向上”计数的逻辑

Question

我似乎不知道应该如何填满进度条。我正在使用倒数计时器来更新进度条上的进度，使其倒计时直到达到零。现在我想扭转进度，让它从零开始并填满，但我该如何实现呢？

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

    @Override
    public void onTick(long millisUntilFinished)
    {
        int progress = (int) (millisUntilFinished/100);
        progressBarCounter.setProgress(progress);
    }

    @Override
    public void onFinish()
    {
        Button nextInstance = (Button) findViewById(R.id.run);
        nextInstance.performClick();
    }
}

Answer 1

progressBar 默认最大值为100。我猜你希望它在每个滴答声中都取得进展，所以在 theCountDownTimer 中你应该定义：

progressBarCounter.setMax((int) millisInFuture/1000);

这样，如果您计算 80 秒 (= 80,000mS)，那么该条的范围将在 0 到 80 之间。
接下来可以使用incrementProgressBy (int diff)方法：

public class theCountDownTimer extends CountDownTimer
{

  public theCountDownTimer(long millisInFuture, long countDownInterval)
  {
    super(millisInFuture, countDownInterval);
    progressBarCounter.setMax((int) millisInFuture/1000);
    progressBarCounter.setProgress(0);  //Reset the progress
  }

  @Override
  public void onTick(long millisUntilFinished)
  {
    progressBarCounter.incrementProgressBy(1);
  }

  @Override
  public void onFinish()
  {
    Button nextInstance = (Button) findViewById(R.id.run);
    nextInstance.performClick();
  }
}

我猜你这里也有错误-

int progress = (int) (millisUntilFinished/100);

您不是要除以1000 而不是100吗？