Android的，我可以把AsyncTask的在一个单独的类，并有回调？ [英] Android, can I put AsyncTask in a separate class and have a callback?

问题描述

我只是学习的AsyncTask，并希望用它作为一个单独的类，而不是一个子类。

I'm just learning about AsyncTask and want to use it as a separate class, rather then a subclass.

例如，

class inetloader extends AsyncTask<String, Void, String> {


    @Override
    protected String doInBackground(String... urls) {

        String response = "";

            DefaultHttpClient client = new DefaultHttpClient();
            HttpGet httpGet = new HttpGet(urls[0]);
            try {
                HttpResponse execute = client.execute(httpGet);
                InputStream content = execute.getEntity().getContent();

                BufferedReader buffer = new BufferedReader(
                        new InputStreamReader(content));
                String s = "";
                while ((s = buffer.readLine()) != null) {
                    response += s;
                }

            } catch (Exception e) {
                e.printStackTrace();
            }

        return response;
    }


    @Override
    protected void onPostExecute(String result) {
        Log.e("xx",result);
        // how do I pass this result back to the thread, that created me?
    }


}

和主（UI）线程：

inetloader il = new inetloader();
il.execute("http://www.google.com");
//il.onResult()
//{
    ///do something...
//}

谢谢！

推荐答案

使用一个接口。是这样的：

Use a interface. Something like:

interface CallBackListener{
  public void callback();
}

然后做你的UI线程：

Then do this in your UI thread:

inetloader il = new inetloader();
li.setListener(this);
il.execute("http://www.google.com");

在inetloader，地址：

In inetloader, add:

   CallBackListener mListener;

   public void setListener(CallBackListener listener){
     mListener = listener;
   }

然后在postExecute（），这样做：

then In postExecute(), do:

   mListener.callback();

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