停止观看android - 暂停，然后开始并从停止的地方开始

Question

我有两个按钮“开始”和“暂停”和一个Textview。

我的问题是，当我按下暂停按钮，然后按下后启动按钮，秒表不会停止的地方开始。

感谢您的帮助

public class StopWatch extends Activity { 
    /** Called when the activity is first created. */ 

    private TextView timeflg; 
    private Button startButton; 
    private Button pauseButton; 
    private long mStartTime = 0L; 
    private Handler mHandler = new Handler(); 
    long millis = 0L; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     this.requestWindowFeature(Window.FEATURE_NO_TITLE); 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 

     if (mStartTime == 0L) { 
      mStartTime = SystemClock.uptimeMillis(); 
      mHandler.removeCallbacks(mUpdateTimeTask); 
      mHandler.postDelayed(mUpdateTimeTask, 0); 


      } 

      timeflg = (TextView) findViewById(R.id.timeflag); 

      startButton = (Button) findViewById(R.id.start); 
      startButton.setOnClickListener(new View.OnClickListener() { 
       public void onClick(View view){ 

        mHandler.postDelayed(mUpdateTimeTask, 0); 

       } 
      }); 

      pauseButton = (Button) findViewById(R.id.pause); 
      pauseButton.setOnClickListener(new View.OnClickListener() { 
       public void onClick(View view){ 

        mHandler.removeCallbacks(mUpdateTimeTask); 

       } 
      }); 

    } 

    private Runnable mUpdateTimeTask = new Runnable() { 
      public void run() { 

        millis = SystemClock.uptimeMillis() - mStartTime; 

        int seconds = (int) (millis/1000); 
        int minutes = seconds/60; 
        seconds = seconds % 60; 
        int milliseconds = (int) (millis%1000); 
        timeflg.setText("" + minutes + ":" + String.format("%02d",seconds)+ ":" 
        + String.format("%03d",milliseconds)); 
        mHandler.postDelayed(this,0); 
      } 

    }; 



} 

Answer 1

有问题：在创建活动时

millis = SystemClock.uptimeMillis() - mStartTime;

mStartTime被初始化。 然后显示的时间是从mStartTime开始计算的。编辑：
我看你还是不明白。

初始化mStartTime按下启动按钮时，当前的推移开始时间：

 startButton.setOnClickListener(new View.OnClickListener() { 
      public void onClick(View view){ 
       mStartTime = SystemClock.uptimeMillis(); 
       mHandler.postDelayed(mUpdateTimeTask, 0); 
      } 
     }); 

计算mCurrenLapse时间。 显示时间是过去的失误和当前经过的时间的时间：

private Runnable mUpdateTimeTask = new Runnable() { 
     public void run() { 
       mCurrentLapse = SystemClock.uptimeMillis() - mStartTime; 
       // 
       long displayTime = mTime + mCurrentLapse; 
       . 
       . 
       . 

总时间是所有流逝的时间，点击时暂停然后当前时间经过被添加到总时间：

 pauseButton.setOnClickListener(new View.OnClickListener() { 
      public void onClick(View view){ 
       mTime += mCurrentLapse; 
       mHandler.removeCallbacks(mUpdateTimeTask); 
      } 
     });