Android中保存的onResume活動狀態？

Question

如何使用system.currentTimeMillis記錄秒錶的開始時間？當您調用activityonResume()或onStart()時，如何更新手錶以顯示從保存時間起經過的時間？謝謝。什麼到目前爲止，我還沒有試過onResume()：

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    // TODO Auto-generated method stub 
    super.onCreate(savedInstanceState); 
    requestWindowFeature(Window.FEATURE_LEFT_ICON); 
    setContentView(R.layout.stopwatch); 
    getWindow().setFeatureDrawableResource(Window.FEATURE_LEFT_ICON, R.drawable.clock32); 

    // initializes controls 
    initControls(); 

    // sets format for chronometer 
    chronometer.setText("00:00:00"); 


} 


private void initControls(){ 

    // initializes buttons & chronometer 
    pause = (Button) findViewById (R.id.btStopWatchPause); 
    stop = (Button) findViewById (R.id.btStopWatchStop); 
    start = (Button) findViewById (R.id.btStopWatchStart); 
    reset = (Button) findViewById (R.id.btStopWatchReset); 
    chronometer = (Chronometer) findViewById (R.id.chronometer); 

    // sets listeners for buttons and chronometer 
    pause.setOnClickListener(this); 
    stop.setOnClickListener(this); 
    start.setOnClickListener(this); 
    reset.setOnClickListener(this); 
    chronometer.setOnChronometerTickListener(this); 


} 


public void onClick(View v) { 
    // TODO Auto-generated method stub 

    switch(v.getId()) 
    { 
    case R.id.btStopWatchStart: 
     chronometer.setBase(SystemClock.elapsedRealtime() + timeWhenStopped); 
     chronometer.start(); 
     break; 
    case R.id.btStopWatchStop: 
     chronometer.stop(); 
     break; 
    case R.id.btStopWatchReset: 
     chronometer.setBase(SystemClock.elapsedRealtime()); 
     break; 
    case R.id.btStopWatchPause: 
     timeWhenStopped = chronometer.getBase() - SystemClock.elapsedRealtime(); 
     chronometer.stop(); 
     break; 

    } // end of switch statement 

} 

public void onChronometerTick(Chronometer c) { 
    // TODO Auto-generated method stub 

    CharSequence text = c.getText(); 
    if (text.length() == 5) { 
     c.setText("00:" + text); 
    } else if (text.length() == 7) { 
     c.setText("0" + text); 
    } 



} // end of onChronometerTick method 

Answer 1

@Override 
    protected void onResume() { 
    super.onResume(); 
    TimeForActivity.StartTimer(AccountingTab.this); 

    public class TimeForActivity implements Constants{ 
    public static void StartTimer(Context context, TextView aTvTime, Button aBtUserStatus, ProgressDialog aProgressDialog, String sessionID) { 

     mHandler.removeCallbacks(mUpdateTimeTask); 

     activity = context; 
     tvTime = aTvTime;  
     btUserStatus = aBtUserStatus; 

     tvTime.setText(""); 
     btUserStatus.setText(statusItems[userStatus - 1]); 


     btUserStatus.setOnClickListener(new View.OnClickListener() { 
      public void onClick(View v) { 

       showStatusDialog(); 
      } 
     }); 
     progressDialog = aProgressDialog;  

     reStartTimer(); 
    } 
    private static void reStartTimer() { 


    if (pageConfig.getUserStatusTime() != null && StatusService.methodType != StatusService.GO_OUT) { 

      if (mStartTime == null) 
       mStartTime = pageConfig.getUserStatusTime() * 60 * 1000 - SystemClock.elapsedRealtime(); 
      //CommonHelper.showToastMsg(activity, Long.toString(SystemClock.elapsedRealtime())); 
      //tvUserStatus.setText(Long.toString(SystemClock.uptimeMillis()) + " mStarTime: " + mStartTime); 
      mHandler.removeCallbacks(mUpdateTimeTask); 
      mHandler.postDelayed(mUpdateTimeTask, 100); 
     } 
    } 

private static Runnable mUpdateTimeTask = new Runnable() { 

     public void run() { 

      try { 
       final long start = mStartTime;   
       long millis = SystemClock.elapsedRealtime() + start; 
       long seconds = (long) (millis/1000); 
       long hours = seconds/3600; 
       seconds -= hours * 3600; 
       long minutes = seconds/60; 
       seconds  = seconds % 60; 


       tvTime.setText(CommonHelper.getTwoDigitTime(hours) + ":" + CommonHelper.getTwoDigitTime(minutes)); 
         //+ ":" + CommonHelper.getTwoDigitTime(seconds)); 
       //java.lang.System.out.println(tvTime.getText().toString()); 
       if (userStatus == StatusService.GO_OUT){ 
        tvTime.setText(""); 
        stopTimer(); 
       } 
       if (StatusService.methodType != StatusService.GO_OUT) 
        mHandler.postAtTime(this, SystemClock.elapsedRealtime() + 60*1000); 

      } catch (Exception e) { 
       // TODO: handle exception 
      } 

     } 
    }; 
    }