How to stop background running timer

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Mobile

Android

Hi friends, i am showing a toast every 5 seconds when my app starting,then i show an toast every 2 seconds when click button but there are two toast running when i am press the button.i want on show only one toast every two seconds after button click.

public class MainActivity extends ActionBarActivity {
    Button panic;
    String TimeHand="s";
    Timer timer;
    final Handler handler = new Handler();
    TimerTask timerTask;
    int k=5,l=2;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        panic=(Button)findViewById(R.id.button);
        panic.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (panic.getText().equals("Panic")) {
                    panic.setText("Disable Panic");
                    Toast.makeText(getApplicationContext(), "2 Seconds", Toast.LENGTH_LONG).show();

                    timer.cancel();
                    startTimer();
                    initializeTimerTask();
                    timer.schedule(timerTask,0,l*1000);

                }
                else if (panic.getText()=="Disable Panic")
                {
                    panic.setText("Panic");
                    Toast.makeText(getApplicationContext(), "60 Seconds", Toast.LENGTH_LONG).show();


                    timer.schedule(timerTask,0, k*1000);
                }
            }
        });

    }

    @Override
    protected void onResume() {
        super.onResume();

        //onResume we start our timer so it can start when the app comes from the background
        startTimer();
    }

    public void startTimer() {
        //set a new Timer
        timer = new Timer();

        //initialize the TimerTask's job
        initializeTimerTask();

        timer.schedule(timerTask, 0, k * 1000); //
    }

    public void stoptimertask(View v) {
        //stop the timer, if it's not already null
        if (timer != null) {
            timer.cancel();
            timer = null;
        }
    }

    public void reScheduleTimer(int t) {
        timer = new Timer("alertTimer",true);
        timerTask = new MyTimerTask();
        timer.schedule(timerTask, 0, t * 1000);
    }

    private class MyTimerTask extends TimerTask {
        @Override
        public void run() {

        }
    }
    public void initializeTimerTask() {

        timerTask = new TimerTask() {
            public void run() {

                //use a handler to run a toast that shows the current timestamp
                handler.post(new Runnable() {
                    public void run() {
                        //get the current timeStamp
                        Calendar calendar = Calendar.getInstance();
                        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("dd:MMMM:yyyy HH:mm:ss a");
                        final String strDate = simpleDateFormat.format(calendar.getTime());

                        //show the toast
                        int duration = Toast.LENGTH_SHORT;
                        Toast toast = Toast.makeText(getApplicationContext(), strDate, duration);
                        toast.show();
                    }
                });
            }
        };
    }


}