Android - How to stop and pause the timer

I tried a lot of problems trying to pause and pause the timer, and if I block the orientation to portrait or landscape work, but that’s not quite what I want to do. Of course, the onCreate method is called when you change the orientation, so I cancel my timertask and set it to zero, but after you perform the orientation more than once, it no longer cancels the timertask. Here I looked through the questions of other nations, but no one seemed to answer my question. Here is my code. This is a bit messy at the moment, because I'm trying everything I can to make it work.

public class singleTimer extends Activity implements OnClickListener {

private Integer setTime = 0;
private Integer tmrSeconds = 0;
private Integer tmrMilliSeconds = 0;
private Timer myTimer = new Timer();
private TimerTask myTimerTask;
private TextView timerText;
private boolean isPaused = true;

@Override
public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.single_timer);
    Bundle extras = getIntent().getExtras();
    setTime = extras.getInt("com.bv.armyprt.timer_duration");
    if (myTimerTask != null) {
        myTimerTask.cancel();
        myTimerTask = null;
    }
    if (savedInstanceState != null) {
        if (savedInstanceState.getInt("tmrSeconds") == 0) {
            tmrSeconds = setTime;
        } else {
            tmrSeconds = savedInstanceState.getInt("tmrSeconds");
            tmrMilliSeconds = savedInstanceState.getInt("tmrMilliseconds");

            if (isPaused == false) {
                myTimer = new Timer();
                myTimerTask = new TimerTask() {
                    @Override
                    public void run() {
                        TimerMethod();
                    }
                };
                myTimer.schedule(myTimerTask, 0, 100);
            }

        }
    } else {
        tmrSeconds = setTime;
    }
    timerText = (TextView)findViewById(R.id.timerText);
    timerText.setText(String.format("%03d.%d", tmrSeconds, tmrMilliSeconds));

    TextView timerDesc = (TextView)findViewById(R.id.timerDescription);
    timerDesc.setText("Timer for: " + setTime.toString());
    Button startButton = (Button)findViewById(R.id.timerStart);
    Button stopButton = (Button)findViewById(R.id.timerStop);
    Button closeButton = (Button)findViewById(R.id.timerClose);
    closeButton.setOnClickListener(this);
    startButton.setOnClickListener(this);
    stopButton.setOnClickListener(this);

}

@Override
public void onClick(View v) {
    // TODO Auto-generated method stub
    switch (v.getId()) {
    case (R.id.timerStart):
        isPaused = false;
        myTimer = new Timer();
        myTimerTask = new TimerTask() {
            @Override
            public void run() {
                TimerMethod();
            }
        };
        myTimer.schedule(myTimerTask,0, 100);
        break;

    case (R.id.timerStop):
        isPaused = true;
        myTimerTask.cancel();
        myTimerTask = null;
        myTimer.cancel();

        break;

    case (R.id.timerClose):
        onDestroy();
        this.finish();
        break;
    }

}
private void TimerMethod()
{
    //This method is called directly by the timer
    //and runs in the same thread as the timer.
    //We call the method that will work with the UI
    //through the runOnUiThread method.
    this.
    tmrMilliSeconds--;
    this.runOnUiThread(Timer_Tick);
}

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

    //This method runs in the same thread as the UI.               
        if (tmrSeconds > 0) {
            if (tmrMilliSeconds <= 0) {
                tmrSeconds--;
                tmrMilliSeconds = 9;
            }
        } else {
            Vibrator v = (Vibrator)getSystemService(Context.VIBRATOR_SERVICE);
            v.vibrate(1000);
            myTimer.cancel();
            tmrSeconds = setTime;
            tmrMilliSeconds = 0;
            isPaused = true;
        }

    //Do something to the UI thread here
        timerText.setText(String.format("%03d.%d", tmrSeconds, tmrMilliSeconds));
    }
};

@Override
public void onSaveInstanceState(Bundle savedInstanceState){
    savedInstanceState.putInt("setTimer", setTime);
    savedInstanceState.putInt("tmrSeconds", tmrSeconds);
    savedInstanceState.putInt("tmrMilliseconds", tmrMilliSeconds);

    super.onSaveInstanceState(savedInstanceState);
}

@Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
    super.onRestoreInstanceState(savedInstanceState);

    setTime = savedInstanceState.getInt("setTimer");
    tmrSeconds = savedInstanceState.getInt("tmrSeconds");
    tmrMilliSeconds = savedInstanceState.getInt("tmrMilliSeconds");
}
}