如何实现从AsyncTask的Andr​​oid中一个Webservice的连接？ [英] How to implement a Webservice Connection from AsyncTask in Android?

问题描述

我有一个问题。

我在做这个，因为小时无果而终：

I'm working on this since hours without result:

    public void getData(){

    new Task().execute();


}

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

    @Override
    protected String doInBackground(Void... noargs) {
        return null;
    }

    protected void onPostExecute(String result){

        DefaultHttpClient client = new DefaultHttpClient();
        HttpGet request = new HttpGet("http://www.omdbapi.com/?t=True%20Grit&y=1969");
        try {
            HttpResponse response = client.execute(request);
            BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
            String line = "";
            StringBuffer zeile = new StringBuffer("");

            while((line = rd.readLine()) != null){
                zeile.append(line);
            }

            String res = zeile.toString();

            Toast toast = Toast.makeText(getApplicationContext(), res, Toast.LENGTH_SHORT);
            toast.show();
        } catch (ClientProtocolException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

}

每次（在GETDATE（）是由一个按钮调）我得到一个例外，我的手机就可以说：不幸的是，应用程序是完成。做YOUT知道我的错误是什么？

Everytime (the getDate() is called by a button) I get an exception and on my phone it says that "Unfortunately the app was finished". Do yout know where my mistake is?

例外情况是：NetworkOnMainThreadException，我怎么能解决这个问题。

The Exception is a: NetworkOnMainThreadException, how can I solve it?

感谢ü这么多！

推荐答案

您应该将所有与网络相关的code到 doInBackground（）和处理的结果在 onPostExecute网络呼叫（）。这是你的code应该怎么是这样的：

You should move all network related code to doInBackground() and process the result of the network call inside onPostExecute(). Here's how your code should look like:

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

    @Override
    protected String doInBackground(Void... noargs) {
        DefaultHttpClient client = new DefaultHttpClient();
        HttpGet request = new HttpGet("http://www.omdbapi.com/?t=True%20Grit&y=1969");
        try {
            HttpResponse response = client.execute(request);
            BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
            String line = "";
            StringBuffer zeile = new StringBuffer("");

            while((line = rd.readLine()) != null){
                zeile.append(line);
            }

            String res = zeile.toString();
            return res;  
        } catch (ClientProtocolException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return "";
    }

    protected void onPostExecute(String result){
            Toast toast = Toast.makeText(getApplicationContext(), result, Toast.LENGTH_SHORT);
            toast.show();
    }

}

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