TimerTask working only when button clicked, not at specified time

Question

I'm trying to do a task at specific time and start the TimerTask for the first time on a button click. When the button is clicked, after first time the system.out should be printed everyday at a time. But it works only when button is clicked and not at specified time.

This is the activity in which I set button to start timer.

showViewReport.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Alarm alarm = new Alarm();

        }
    });

The class with timer:

public class Alarm {
Timer _timer;
Context context;
public Alarm() {

    // Create a Date corresponding to 10:30:00 AM today.
    Calendar calendar = Calendar.getInstance();
    calendar.set(Calendar.HOUR_OF_DAY, 7);
    calendar.set(Calendar.MINUTE, 56);
    calendar.set(Calendar.SECOND, 0);
    this.context = context;
    Date alarmTime = calendar.getTime();

    _timer = new Timer();
    _timer.schedule(new AlarmTask(), alarmTime);
}

class AlarmTask extends TimerTask {
    public void run() {
        System.out.println("*************Ok Alarm****************************");

       // _timer.cancel();
    }
}

}

What am I doing wrong?