How to set timer in android?

Question

Can someone give a simple example of updating a textfield every second or so?

I want to make a flying ball and need to calculate/update the ball coordinates every se

Answer 1

I Abstract Timer away and made it a separate class:

Timer.java

import android.os.Handler;

public class Timer {

    IAction action;
    Handler timerHandler = new Handler();
    int delayMS = 1000;

    public Timer(IAction action, int delayMS) {
        this.action = action;
        this.delayMS = delayMS;
    }

    public Timer(IAction action) {
        this(action, 1000);
    }

    public Timer() {
        this(null);
    }

    Runnable timerRunnable = new Runnable() {

        @Override
        public void run() {
            if (action != null)
                action.Task();
            timerHandler.postDelayed(this, delayMS);
        }
    };

    public void start() {
        timerHandler.postDelayed(timerRunnable, 0);
    }

    public void stop() {
        timerHandler.removeCallbacks(timerRunnable);
    }
}

And Extract main action from Timer class out as

IAction.java

public interface IAction {
    void Task();
}

And I used it just like this:

MainActivity.java

public class MainActivity extends Activity implements IAction{
...
Timer timerClass;
@Override
protected void onCreate(Bundle savedInstanceState) {
        ...
        timerClass = new Timer(this,1000);
        timerClass.start();
        ...
}
...
int i = 1;
@Override
public void Task() {
    runOnUiThread(new Runnable() {

        @Override
        public void run() {
            timer.setText(i + "");
            i++;
        }
    });
}
...
}

I Hope This Helps