Asynctask to fix error

[Gaios Augustus]

I am trying to get JSON from RPC and I am keep getting error:

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.cryptowallet/com.example.cryptowallet.UserProfile}: android.os.NetworkOnMainThreadException

I found out that application is crashing at line:

HttpResponse response = httpclient.execute(httppost);

Full code looks like:

 private JSONObject invokeRPC(String id, String method, List<String> params) {
        DefaultHttpClient httpclient = new DefaultHttpClient();

        JSONObject json = new JSONObject();
        json.put("id", id);
        json.put("method", method);
        if (null != params) {
            JSONArray array = new JSONArray();
            array.addAll(params);
            json.put("params", params);
        }
        JSONObject responseJsonObj = null;
        try {
            httpclient.getCredentialsProvider().setCredentials(new AuthScope("http://blockchain.oss.unist.hr", 8332),
                    new UsernamePasswordCredentials("student", "WYVyF5DTERJASAiIiYGg4UkRH"));
            StringEntity myEntity = new StringEntity(json.toJSONString());
            System.out.println(json.toString());
            HttpPost httppost = new HttpPost("http://blockchain.oss.unist.hr:8332");
            httppost.setEntity(myEntity);
            System.out.println("executing request" + httppost.getRequestLine());
            //Problem ispod
            //_____________________________________________________
            HttpResponse response = httpclient.execute(httppost);
            //_____________________________________________________
            HttpEntity entity = response.getEntity();
            System.out.println("----------------------------------------");
            System.out.println(response.getStatusLine());
            if (entity != null) {
                System.out.println("Response content length: " + entity.getContentLength());
                // System.out.println(EntityUtils.toString(entity));
            }
            JSONParser parser = new JSONParser();
            responseJsonObj = (JSONObject) parser.parse(EntityUtils.toString(entity));
        } catch (ClientProtocolException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (org.json.simple.parser.ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally {
            httpclient.getConnectionManager().shutdown();
        }
        return responseJsonObj;
    }

I tried to put it in Asynctask but I didn't know how to do it, all attempts failed.

[Dave Tolls]

What does your AsyncTask look like?
How is it called?

[Gaios Augustus]

Dave Tolls wrote:What does your AsyncTask look like?
How is it called?

Well I removed it completely as I didn't know how to get it work, it always returnet me NULL object.

[Stephan van Hulst]

Rewrite the asynchronous code and show it to us. We will comment on possible mistakes.