倒數計時器，按下按鈕後提高速度

Question

我想創建一個倒計時器，按下按鈕後將增加其速度我還使用計數器來調整進度條。

現在我正在調整按鈕按下後的速度（增加），但它不是從頭開始。例如，當我開始我的程序時，定時器從頭開始遞減，這很好。然而，當我按下按鈕計數器不從這樣的起點開始：

我想這只是爲了每個按鈕按下後跑得更快，不降低長。

這是我的代碼：

mTrueBtn.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      //is the user right? if pressing True button 
      if(isMathProblemTrue == 1){ 
       //user is correct 
       Toast.makeText(MainActivity.this,"Correct!",Toast.LENGTH_SHORT).show(); 
       generateMathProblem(); 
       timer_length *= 0.8; 
       timer_interval *= 0.8; 
       Log.d(TAG,"time length:"+timer_length); 
       Log.d(TAG,"time interval:"+timer_interval); 
       mCountDownTimer.cancel(); 
       createNStartTimer(); 
       //restartTimer(); 
      }else{ 
       //user is incorrect 
       transferUserToStartScreen(); 
       //reset the timer 
       mCountDownTimer.cancel(); // cancel 
      } 
     } 
    }); 
private void createNStartTimer() { 
    mCountDownTimer = new CountDownTimer(timer_length,timer_interval) { 
     @Override 
     public void onTick(long millisUntilFinished) { 
      Log.d(TAG,"Mil until finish:"+millisUntilFinished); 
      int progress = (int) (millisUntilFinished/100); 
      mProgressBar.setProgress(progress); 
     } 
     @Override 
     public void onFinish() { 
      mProgressBar.setProgress(0); 
      transferUserToStartScreen(); 
     } 
    }.start(); 
} 

Answer 1

創建功能外2個全局常量

int totalMillisUntilFinished = 0; 
bool firstTime = true; 

我們初始化totalMillisUntilFinished當onTick被調用的時候，所以更新您的onTick功能：

private void createNStartTimer() { 
    firstTime = true; 
    mCountDownTimer = new CountDownTimer(timer_length,timer_interval) { 
     @Override 
     public void onTick(long millisUntilFinished) { 
      if(firstTime){totalMillisUntilFinished = millisUntilFinished; firstTime = false;} 
      Log.d(TAG,"Mil until finish:"+millisUntilFinished); 
      int progress = (int) (millisUntilFinished*100/totalMillisUntilFinished); 
      mProgressBar.setProgress(progress); 
     } 

我個人使用Handlers和Runnable s，我肯定會建議尋找代替。