How to resume it when i click resume button?

Question

//Counter of time since app started ,a background task

    private long mStartTime = 0L;

//Private long mPauseTime = 0L;

    private TextView mTimerLabel;

//Handler to handle the message to the timer task

    private Handler mHandler = new Handler();

    static final int UPDATE_INTERVAL = 1000;

    String timerStop1;



     @Override
     public void onCreate(Bundle savedInstanceState) {

     mTimerLabel = (TextView) findViewById(R.id.textTimer);


     if(mStartTime == 0L){
         mStartTime = SystemClock.uptimeMillis();
         mHandler.removeCallbacks(mUpdateTimeTask);
         mHandler.postDelayed(mUpdateTimeTask, 100);

       }                

        timerPauseButton.setTag(1);
        timerPauseButton.setText("Pause");



 final Button timerPauseButton = (Button) findViewById(R.id.btnTimerPause);

        timerPauseButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view){

//ChangeButtonText

                  final int status =(Integer) view.getTag();

                  if(status == 1) {
                      mHandler.removeCallbacks(mUpdateTimeTask);

                      mTimerLabel.setText(timerStop1);

                      timerPauseButton.setText("Resume");
                      view.setTag(0); //resume
                  } else{

                      mHandler.removeCallbacks(mUpdateTimeTask);
                      mHandler.postDelayed(mUpdateTimeTask, 100);
                      timerPauseButton.setText("Pause");
                      view.setTag(1); //pause
                      }

            }
        });

   } 

//End of OnCreate

   private Runnable mUpdateTimeTask = new Runnable(){

            public void run() { 
                 {
                  final long start = mStartTime;
                  long millis = SystemClock.uptimeMillis()- start;

                  int seconds = (int) (millis / 1000);
                  int minutes = seconds / 60;
                  seconds = seconds % 60;

                  mTimerLabel.setText("" + minutes + ":"
                                                  + String.format("%02d", seconds));                             

                  timerStop1 = minutes + ":"
                                + String.format("%02d", seconds);

                  mHandler.postDelayed(this, 200);         
                  }

            }    
    };   

Why I click the pause button but timer also will run in background? Example when I click pause in 3sec after 5sec I click resume but it continue go on with 8sec and not 3sec? Thanks

Answer 1

SystemClock.uptimeMillis() clock keeps running when the device is not in deep sleep. You only capture the start clock time once in mStartTime, so the difference between current upTimeMillis() and mStartTime grows. Pausing only stops the mUpdateTimeTask that formats the time difference to mTimerLabel.