如何在固定时间间隔后重复执行异步任务 [英] How to execute Async task repeatedly after fixed time intervals

问题描述

如何让异步任务在一段时间后重复执行，就像定时器一样......实际上我正在开发一个应用程序，它将自动从服务器下载所有最新的未读问候语，为此我必须检查来自服务器的更新经过一些固定的时间间隔......我知道这可以通过计时器轻松完成，但我想使用异步任务，我认为这对 android 应用程序更有效.

How to make Async task execute repeatedly after some time interval just like Timer...Actually I am developing an application that will download automatically all the latest unread greeting from the server and for that purpose I have to check for updates from server after some fixed time intervals....I know that can be easily done through timer but I want to use async task which I think is more efficient for android applications.

推荐答案

public void callAsynchronousTask() {
    final Handler handler = new Handler();
    Timer timer = new Timer();
    TimerTask doAsynchronousTask = new TimerTask() {       
        @Override
        public void run() {
            handler.post(new Runnable() {
                public void run() {       
                    try {
                        PerformBackgroundTask performBackgroundTask = new PerformBackgroundTask();
                        // PerformBackgroundTask this class is the class that extends AsynchTask 
                        performBackgroundTask.execute();
                    } catch (Exception e) {
                        // TODO Auto-generated catch block
                    }
                }
            });
        }
    };
    timer.schedule(doAsynchronousTask, 0, 50000); //execute in every 50000 ms
}

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