不能获得暂停和恢复功能与进度条一起工作

Question

我想创建一个带有圆形进度条的计时器。我已经找到一个很好的例子，开始http://www.androidtutorialshub.com/android-count-down-timer-tutorial/。这个例子有我需要的外观，但我想添加暂停和恢复功能。所以，我确实有暂停和恢复工作，但是，当我点击“暂停”，然后“恢复”，进度条从头开始为一秒钟的唾液，然后从位置暂停设置开始（这是目标）。我的猜测是进度条在某处设置为100％，然后用暂停位置替换，但我找不到可能发生的部分。

改性mainActivity代码：

public class MainActivity extends AppCompatActivity { 

    private long timeCountInMilliSeconds = 1 * 60000; 
    long startTime; 
    long difference; 
    long difference1; 
    private enum TimerStatus { 
     STARTED, 
     STOPPED, 
    } 

    private TimerStatus timerStatus = TimerStatus.STOPPED; 

    private ProgressBar progressBarCircle; 
    private EditText editTextMinute; 
    private TextView textViewTime; 
    private ImageView imageViewReset; 
    private ImageView imageViewStartStop; 
    private CountDownTimer countDownTimer; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     progressBarCircle = (ProgressBar) findViewById(R.id.progressBarCircle); 
     editTextMinute = (EditText) findViewById(R.id.editTextMinute); 
     textViewTime = (TextView) findViewById(R.id.textViewTime); 
     imageViewReset = (ImageView) findViewById(R.id.imageViewReset); 
     imageViewStartStop = (ImageView) findViewById(R.id.imageViewStartStop); 

     imageViewReset.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       reset(); 
      } 
     }); 

     imageViewStartStop.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       pauseResume(); 
      } 
     }); 
    } 

    private void reset() { 
     stopCountDownTimer(); 
     restartCountDownTimer(); 
    } 

    private void pauseResume() { 
     if (timerStatus == TimerStatus.STOPPED) { 
      timeCountInMilliSeconds = 1 * 50000; 
      // setProgressBarValues(timeCountInMilliSeconds); 
      progressBarCircle.setMax((int) (timeCountInMilliSeconds)/1000); 
      progressBarCircle.setProgress((int) (timeCountInMilliSeconds)/1000); 
      imageViewReset.setVisibility(View.VISIBLE); 
      imageViewStartStop.setImageResource(R.drawable.icon_stop); 
      editTextMinute.setEnabled(false); 
      timerStatus = TimerStatus.STARTED; 
      startCountDownTimer(); 
      startTime = System.currentTimeMillis(); 

     } else { 
      imageViewReset.setVisibility(View.GONE); 
      imageViewStartStop.setImageResource(R.drawable.icon_start); 
      editTextMinute.setEnabled(true); 
      timerStatus = TimerStatus.STOPPED; 
      stopCountDownTimer(); 
      if(difference == 0) { 
       difference = System.currentTimeMillis() - startTime; 
      } 
      else{ 
       difference1 = System.currentTimeMillis() - startTime; 
       difference += difference1;} 
     } 

    } 

    private void startCountDownTimer() { 
     countDownTimer = new CountDownTimer(timeCountInMilliSeconds - difference, 1000) { 
      @Override 
      public void onTick(long millisUntilFinished) { 
       textViewTime.setText(hmsTimeFormatter(millisUntilFinished)); 
       progressBarCircle.setProgress((int) (millisUntilFinished/1000)); 
      } 

      @Override 
      public void onFinish() { 

       textViewTime.setText(hmsTimeFormatter(timeCountInMilliSeconds - difference)); 
       // setProgressBarValues(timeCountInMilliSeconds - difference); 
       progressBarCircle.setMax((int) (timeCountInMilliSeconds - difference)/1000); 
       progressBarCircle.setProgress((int) (timeCountInMilliSeconds - difference)/1000); 
       imageViewReset.setVisibility(View.GONE); 
       imageViewStartStop.setImageResource(R.drawable.icon_start); 
       editTextMinute.setEnabled(true); 
       timerStatus = TimerStatus.STOPPED; 
      } 
     }.start(); 
     countDownTimer.start(); 
    } 

    private void restartCountDownTimer() { 
     difference = 0; 
     difference1 = 0; 
     countDownTimer = new CountDownTimer(timeCountInMilliSeconds, 1000) { 
      @Override 
      public void onTick(long millisUntilFinished) { 
       textViewTime.setText(hmsTimeFormatter(millisUntilFinished)); 
       progressBarCircle.setProgress((int) (millisUntilFinished/1000)); 
      } 

      @Override 
      public void onFinish() { 

       textViewTime.setText(hmsTimeFormatter(timeCountInMilliSeconds)); 
       // setProgressBarValues(timeCountInMilliSeconds); 
       progressBarCircle.setMax((int) (timeCountInMilliSeconds)/1000); 
       progressBarCircle.setProgress((int) (timeCountInMilliSeconds)/1000); 
       imageViewReset.setVisibility(View.GONE); 
       imageViewStartStop.setImageResource(R.drawable.icon_start); 
       editTextMinute.setEnabled(true); 
       timerStatus = TimerStatus.STOPPED; 
      } 
     }.start(); 
     countDownTimer.start(); 
    } 

    private void stopCountDownTimer() { 
     countDownTimer.cancel(); 

    } 

    private String hmsTimeFormatter(long milliSeconds) { 

     String hms = String.format("%02d:%02d:%02d", 
       TimeUnit.MILLISECONDS.toHours(milliSeconds), 
       TimeUnit.MILLISECONDS.toMinutes(milliSeconds) - TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(milliSeconds)), 
       TimeUnit.MILLISECONDS.toSeconds(milliSeconds) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(milliSeconds))); 
     return hms; 
    } 
} 

XML文件是相同的，如上述（链接到样本代码）提供的链接。

任何帮助将非常感激。

Answer 1

可能是错误在您的pauseResume。你说progressBarCircle.setProgress((int) (timeCountInMilliSeconds)/1000);。这将当前进度设置为指定值。在你的情况下，这意味着你的最大值相同的值。我认为你应该将整个模块移动到onCreate方法中。

timeCountInMilliSeconds = 1 * 50000; 
progressBarCircle.setMax((int) (timeCountInMilliSeconds)/1000); 
progressBarCircle.setProgress((int) (timeCountInMilliSeconds)/1000); 

它应该足以在开始时初始化这些值一次。

[编辑]

的行为似乎对我好。假设定时器在47秒时按暂停，现在取决于您的定时，定时器可以在999毫秒或001毫秒内暂停。 （指向边缘情况）。在第一种情况下，您必须等待几秒钟，精确到999毫秒，直到计时器切换显示状态。在秒数情况下，感觉应用程序直接响应，因为您只需等待001毫秒。如果要解决这个问题，你的正常化值difference像这样：

private void pauseResume() { 
    if (timerStatus == TimerStatus.STOPPED) { 
     ... 
    } else { 
     ... 
     difference += (((int) (System.currentTimeMillis() - startTime)/1000) + 1) * 1000; 
    } 

} 

我也去掉了usless difference1变量。 我做的另一个改进是，我删除了if else声明，因为它也没用。 您也可以删除+ 1以始终等待1秒。在看到可视化的东西之前。