ejemplo de asynctask

ejemplo de asynctask

 private class UpdateUserAsyncTask extends AsyncTask<Void, String, Integer>{

        @Override
        protected Integer doInBackground(Void... voids) {

            HttpURLConnection urlConnection = null;
            OutputStream output = null;
            int code = 0;

            user.setFirstName(textFirstName.getText().toString());
            user.setLastName(textLastName.getText().toString());

            try {
                URL url = new URL("http://192.168.0.108:3000/users/" + userId);
                urlConnection = (HttpURLConnection) url.openConnection();
                urlConnection.setDoOutput(true);
                urlConnection.setRequestMethod("PUT");
                urlConnection.setRequestProperty("Content-Type","application/json");

                output = urlConnection.getOutputStream();
                JSONObject joData = new JSONObject();
                JSONObject joParent = new JSONObject();
                joData.put("first_name", user.getFirstName());
                joData.put("last_name", user.getLastName());
                joData.put("gender", user.getGender());
                joParent.put("user", joData);
                joParent.put("id", userId);

                output.write(joParent.toString().getBytes("UTF-8"));
                output.close();
                urlConnection.connect();
                code = urlConnection.getResponseCode();

            } catch (Exception e) {
                // TODO Auto-generated catch block
            }finally {
                urlConnection.disconnect();
            }
            return code;
        }

        @Override
        protected void onPostExecute(Integer code) {
            if(code == 422){
                Toast.makeText(getApplicationContext(),
                        "The user can not be updated", Toast.LENGTH_SHORT).show();
            }else if(code == 204){
                Toast.makeText(getApplicationContext(),
                        "The user has been updated", Toast.LENGTH_SHORT).show();
            }else{
                Toast.makeText(getApplicationContext(),
                        "An error has ocurred", Toast.LENGTH_SHORT).show();
            }

        }

    }