java - Android - 在单独的线程上进行 HTTP GET

Question

背景:我是安卓编程新手。我只想简单地向本地服务器发出 http get 请求。

我想向此请求传递一个名称作为参数，并希望获得 json 格式的返回。这个问题我无法在主线程上执行它。我怎样才能做到这一点？

这是我尝试过的:

主类:

itemsAdapter.add(get.getName(device.getName()));

同一文件中的单独类:

private class httpGet extends AsyncTask<Editable, Void, Integer> {
        protected String doInBackground(Editable... params) {
            Editable editable = params[0];
            return getName(editable.toString());
        }
        final String getName(String btName) {
            HttpResponse response = null;
            String result = "";
            try {
                HttpClient client = new DefaultHttpClient();
                HttpGet request = new HttpGet();
                URI website = new URI("http://192.168.1.105/getName.php?q=" + btName);
                request.setURI(website);
                response = client.execute(request);
                // Convert String to json object
                JSONObject json = new JSONObject(response.toString());

                // get LL json object
                JSONObject json_Name = json.getJSONObject("Name");

                // get value from LL Json Object
                name = json_Name.getString("value"); //<< get value here
            } catch (URISyntaxException e) {
                e.printStackTrace();
            } catch (ClientProtocolException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (JSONException e) {
                e.printStackTrace();
                // Do something to recover ... or kill the app.
            }

            return result;
        }

        protected void onPostExecute(Integer result) {
            // here you have the result
        }

我不确定这是否是完成这项任务的好方法。我也不知道该怎么调用它。

Answer 1

AsyncTask 允许您在不同的线程中执行后台操作，而无需操作线程/处理程序。

应该是这样的:

private class httpGet extends AsyncTask<ParamForDoInBackground, ParamForOnProgressUpdate, ParamForOnPostExecute> {
     protected Long doInBackground(ParamForDoInBackground... urls) {
        // do the request here
     }

     protected void onProgressUpdate(ParamForOnProgressUpdate progress) {
        // if you need to show any progress of the 
        // request from doInBackground
     }

     protected void onPostExecute(ParamForOnPostExecute result) {
        // this method will run when doInBackground
        // is done executing
     }
}

然后你可以执行AsyncTask:

new httpGet().execute(ParamForDoInBackground);

您可以使用以下内容作为引用:AndroidBackgroundProcessing和 Android Developer AsyncTask