每5秒将请求发送到Web服务 [英] Send request to web service every 5 second

问题描述

我想听sql server数据库以了解android中是否有数据更改，因此我想每5秒向Web服务发送一次请求以了解新数据值.我该怎么做?你能举个例子吗?

I want to listen sql server database for know whether there are changes of data in android so I want to send request to web service every 5 second to know of new data value.How can I do this? Can you give a example about it?

推荐答案

您可以使用AsyncTask完成

You can do it with AsyncTask,

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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