需要咨询新的AsyncTask递归调用 [英] Need advice new AsyncTask recursive calling

问题描述

我需要的建议是接受的解决方案，并不会造成溢出，我更新它与AsyncTask的阅读，之后的AsyncTask完成我需要一次又一次的更新数据。这是接受的解决方案和安全

I need advice is this solution acceptable and not cause overflow, I update data which read with AsyncTask, after AsyncTask finished I need to update again and again. Is this solution acceptable and safe

private class DownloadFilesTask extends AsyncTask<URL,Integer,com.ring_view.www.json.System> {

    @Override
    protected com.ring_view.www.json.System doInBackground(URL... params) {
        int count = params.length;
         URL temp=params[0];
         System system=null;
        try {
            system = Communicator.getSystem(temp);
        } catch (LoggingConnectionException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (JSONParsingErrorException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

         return system;
    }

     protected void onProgressUpdate(Integer... progress) {
         //setProgressPercent(progress[0]);
     }

     protected void onPostExecute(com.ring_view.www.json.System result) {
         txtWorkAllowedValue.setText(result.work_allowed);
         try {
            new DownloadFilesTask().execute(new URL("http://test/status-system.json"));
        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
     }

 }

我第一次调用新DownloadFilesTask（）执行（新URL（HTTP：//test/status-system.json））;在OvCreate方法，它工作在模拟器罚款。这是安全的或有一些更优雅的解决方案？

I first time call new DownloadFilesTask().execute(new URL("http://test/status-system.json")); in OvCreate method and it works fine in emulator. Is this safe or there is some more elegant solution ?

推荐答案

是的，实例化一个AsyncTask的多次是可以接受的，例如...

Yes, instantiating an AsyncTask multiple times is acceptable, example...

new DownloadFilesTask().execute(...);
...
new DownloadFilesTask().execute(...);

...是允许的。

...is allowed.

您不可以做类似如下虽然...

You must not do something like the following though...

DownloadFilesTask myTask = new DownloadFilesTask();
myTask.execute(...); // This is OK
myTask.execute(...); // This will cause an exception

这是因为它是不合法的执行两次相同的线程。在第一个例子中使用新多次创造了一个新的线程 doInBackground（...）但在第二个例子中它正在试图重新使用previous之一。

This is because it isn't legal to execute the same thread twice. In the first example using new repeatedly creates a new thread for doInBackground(...) but in the second example it is trying to re-use the previous one.

这篇关于需要咨询新的AsyncTask递归调用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！