每个人似乎都忘记在发布新的可运行文件或消息之前清理处理程序。否则，它们可能会累积并导致不良行为。

handler.removeMessages(int what);
// Remove any pending posts of messages with code 'what' that are in the message queue.

handler.removeCallbacks(Runnable r)
// Remove any pending posts of Runnable r that are in the message queue.

Kotlin & Java多种方式

1. 使用处理程序

Handler().postDelayed({
    TODO("Do something")
    }, 2000)

2. 使用TimerTask

Timer().schedule(object : TimerTask() {
    override fun run() {
        TODO("Do something")
    }
}, 2000)

或者更短

Timer().schedule(timerTask {
    TODO("Do something")
}, 2000)

或者说最短的是

Timer().schedule(2000) {
    TODO("Do something")
}

3.使用执行人

Executors.newSingleThreadScheduledExecutor().schedule({
    TODO("Do something")
}, 2, TimeUnit.SECONDS)

在Java中

1. 使用处理程序

new Handler().postDelayed(new Runnable() {
    @Override
    public void run() {
        //Do something
    }
}, 2000);

2. 使用定时器

new Timer().schedule(new TimerTask() {          
    @Override
    public void run() {
        // Do something
    }
}, 2000);

3.使用ScheduledExecutorService

private static final ScheduledExecutorService worker = Executors.newSingleThreadScheduledExecutor();

Runnable runnable = new Runnable() {
  public void run() {
      // Do something
  }
  };
worker.schedule(runnable, 2, TimeUnit.SECONDS);

我创建了一个更简单的方法来调用它。

public static void CallWithDelay(long miliseconds, final Activity activity, final String methodName)
    {
        new Handler().postDelayed(new Runnable() {

            @Override
            public void run() {
                try {
                    Method method =  activity.getClass().getMethod(methodName);
                    method.invoke(activity);
                } catch (NoSuchMethodException e) {
                    e.printStackTrace();
                } catch (InvocationTargetException e) {
                    e.printStackTrace();
                } catch (IllegalAccessException e) {
                    e.printStackTrace();
                }
            }
        }, miliseconds);
    }

要使用它，只需调用:.CallWithDelay(5000，这个，"DoSomething");

下面是Kotlin的答案，你们这些懒惰的人:

Handler().postDelayed({
//doSomethingHere()
}, 1000)

你可以在UIThread中使用Handler:

runOnUiThread(new Runnable() {
                
    @Override
    public void run() {
        new Handler().postDelayed(new Runnable() {
           @Override
           public void run() {
               //add your code here
          }
        }, 1000);           
    }
});

以下是我的最短解决方案:

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