How to execute scheduled tasks in the Android UI thread and androidui thread

How to execute scheduled tasks in the Android UI thread and androidui thread

In projects, we often encounter execution of scheduled tasks. For example, in the following scenario: Click the return key twice in two seconds, and the application exits. The general idea of implementing this function is as follows: Define a class variable goback and record the number of clicks. If you click it twice in 2 seconds, it will finish. If not, goback will be reset to 0, one of the implementation methods is as follows (1.0 ):

<span style="white-space:pre"></span>new Handler().postDelayed(new Runnable() {@Overridepublic void run() {goback = 0;}}, 2000);

Next, I will discuss other methods to implement the above functions:

1.1 Use ScheduledExecutorService

private static final ScheduledExecutorService worker =   Executors.newSingleThreadScheduledExecutor();  Runnable task = new Runnable() {    public void run() {      /* Do something… */    }  worker.schedule(task, 2, TimeUnit.SECONDS);

1.2 use Timer class

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

1.3 still uses handler, but added message sending.

Handler myHandler = new DoSomething();Message m = new Message();m.obj = c;//passing a parameter heremyHandler.sendMessageDelayed(m, 1000);class DoSomething extends Handler {        @Override        public void handleMessage(Message msg) {          MyObject o = (MyObject) msg.obj;          //do something here        }    }

1.4 The last Thread class is a little cumbersome and is not recommended.

private static long SLEEP_TIME = 2 // for 2 second..MyLauncher launcher = new MyLauncher();            launcher.start();..private class MyLauncher extends Thread {        @Override        /**         * Sleep for 2 seconds as you can also change SLEEP_TIME 2 to any.          */        public void run() {            try {                // Sleeping                Thread.sleep(SLEEP_TIME * 1000);            } catch (Exception e) {                Log.e(TAG, e.getMessage());            }            //do something you want to do           //And your code will be executed after 2 second        }    }

There are almost five of the above practices, each of which has its own application scenarios. The code is relatively simple. You just need to use it directly.