Question

I’m trying to have a Timer that schedules a TimerTask for successive executions. I don’t know how many times it’ll work. on a user click, the Timer will stop, and on another, it’ll run again. Everything works until stopping, when i reschedule, I get exceptions saying that the Timer is canceled or already scheduled. How do I make it stop and run again? I’ve tried everything I could think of and it’s still not working.

This is the latest code I’m trying:

        Timer myTimer;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    cameraTimedTask = new camera(this);

        myTimer = new Timer("cameraTimer");

        Button b=(Button)findViewById(R.id.b);
        b.setOnClickListener(new OnClickListener(){
            public void onClick(View v) {
                myTimer.purge();
                myTimer.scheduleAtFixedRate(cameraTimedTask, 1000, 5000);
            }
        });

        Button bb=(Button)findViewById(R.id.button);
        bb.setOnClickListener(new OnClickListener(){
            public void onClick(View v) {
                myTimer.cancel();
                myTimer.purge();
                myTimer = null;
                myTimer = new Timer("camerasTimer");
                Log.i("Check","[main]"+" timer stopped");
            }
        });

    }

Answer 1

You can’t reschedule a TimerTask. You need a new one every time. Moreover, it is advised in android to use Handlers and postDelayed.