Android:AsyncTask 发出 HTTP GET 请求? [英] Android: AsyncTask to make an HTTP GET Request?

问题描述

我是 Android 开发新手.我的问题是，我是否使用 AsyncTask 来发出 HTTP GET 请求(JSON 响应)?这个对吗?如果这确实是真的，有谁知道我在哪里可以看到这样的例子?如果没有，你能纠正我吗?谢谢！

I'm new to Android development. My question is, do I use AsyncTask in order to make an HTTP GET request (JSON response)? Is this correct? Does anyone know where I can see an example of this if this is indeed true? If not, could you correct me? Thanks!

推荐答案

是的，你说得对，Asynctask 用于短期运行的任务，例如连接到网络.它还用于后台任务，这样您就不会因为无法在 UI/主线程中进行网络连接而阻塞 UI 线程或出现异常.

Yes you are right, Asynctask is used for short running task such as connection to the network. Also it is used for background task so that you wont block you UI thread or getting exception because you cant do network connection in your UI/Main thread.

示例:

class JSONAsyncTask extends AsyncTask<String, Void, Boolean> {


@Override
protected void onPreExecute() {
    super.onPreExecute();

}

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

        //------------------>>
        HttpGet httppost = new HttpGet("YOU URLS TO JSON");
        HttpClient httpclient = new DefaultHttpClient();
        HttpResponse response = httpclient.execute(httppost);

        // StatusLine stat = response.getStatusLine();
        int status = response.getStatusLine().getStatusCode();

        if (status == 200) {
            HttpEntity entity = response.getEntity();
            String data = EntityUtils.toString(entity);


            JSONObject jsono = new JSONObject(data);

            return true;
        }


    } catch (IOException e) {
        e.printStackTrace();
    } catch (JSONException e) {

        e.printStackTrace();
    }
    return false;
}

protected void onPostExecute(Boolean result) {

}

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