Essential Books

Use Handler to create a Timer similar to javax.swing.Timer

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This can be useful if you’re writing a game or something that needs to execute a piece of code every a few seconds. 

import android.os.Handler;

public class Timer {
    private Handler handler;
    private boolean paused;

    private int interval;

    private Runnable task = new Runnable () {
        @Override
        public void run() {
            if (!paused) {
                runnable.run ();
                Timer.this.handler.postDelayed (this, interval);
            }
        }
    };

    private Runnable runnable;

    public int getInterval() {
        return interval;
    }

    public void setInterval(int interval) {
        this.interval = interval;
    }

    public void startTimer () {
        paused = false;
        handler.postDelayed (task, interval);
    }

    public void stopTimer () {
        paused = true;
    }

    public Timer (Runnable runnable, int interval, boolean started) {
        handler = new Handler ();
        this.runnable = runnable;
        this.interval = interval;
        if (started)
            startTimer ();
    }
}

Example usage: 

Timer timer = new Timer(new Runnable() {
    public void run() {
        System.out.println("Hello");
    }
}, 1000, true)

This code will print “Hello” every second.

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Handler:
* Handler
* HandlerThreads and communication between Threads
* Use Handler to create a Timer similar to javax.swing.Timer
* Using a Handler to execute code after a delayed amount of time
* Stop handler from execution
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