Schedules the task to run asynchronously in Android

There are three ways to do this.
1.
    private static final ScheduledExecutorService worker = 
      Executors.newSingleThreadScheduledExecutor();

    void someMethod() {
      ...
      Runnable task = new Runnable() {
        public void run() {
          /* Do something... */
        }
      };
      worker.schedule(task, 5, TimeUnit.SECONDS);
      ...
    }

2.
    new Timer().schedule(new TimerTask() {          
        @Override
        public void run() {
            // This code will be executed after 2 seconds       
        }
    }, 2000);

3.
    final Handler handler = new Handler();
    handler.postDelayed(new Runnable() {
      @Override
      public void run() {
        //Do something after 100ms
      }
    }, 100);