JSON Get and POST method using urlconnection

Get Method :

 class GetData extends AsyncTask<String, Void, String> implements DialogInterface.OnCancelListener {

        ProgressHUD mProgressHUD;

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            mProgressHUD = ProgressHUD.show(PetGallery.this,"Getting Data", false,false, this);
        }

        @Override
        protected String doInBackground(String... params) {
            String msg = null; int status =0;

            StringBuilder sb = new StringBuilder();
            try {
                URL get_url = new URL(Constant.GET_URL);
                HttpURLConnection conn = (HttpURLConnection) get_url.openConnection();
                conn.setRequestMethod("GET");
                conn.setDoInput(true);

                status = conn.getResponseCode();
                msg = conn.getResponseMessage();
                BufferedReader reader = new BufferedReader(
                        new InputStreamReader(conn.getInputStream()));

                String line = null;
                // Read Server Response
                while ((line = reader.readLine()) != null) {
                    sb.append(line);
                    break;
                }
                reader.close();
                return sb.toString();

            } catch (Exception e) {
                Log.e("Http Response: ", msg);
            }

            return msg;
        }

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            if(s!=null) {
                String status;
                try {
                    JSONObject jsonObject = new JSONObject(s);
                    status = jsonObject.getString(Constant.STATUS);
                    if (status.equals("success")) {
                        JSONArray jsonArray = jsonObject.getJSONArray(Constant.GET_ARRAY);
                        for (int i = 0; i < jsonArray.length(); i++) {
                            JSONObject object = jsonArray.getJSONObject(i);
                            String id = object.getString(Constant.PETID);
                            String url = object.getString(Constant.PHOTO_STRING);
                            String details = object.getString(Constant.DESC);
                            String place = object.getString(Constant.PLACE);
                            String date = object.getString(Constant.DATE);
                            String name = object.getString(Constant.NAME);
                            String contact = object.getString(Constant.CONTACT);

                            HashMap<String, String> map = new HashMap<String, String>();
                            map.put(Constant.PETID, id);
                            map.put(Constant.PHOTO_STRING, url);
                            map.put(Constant.DESC, details);
                            map.put(Constant.PLACE, place);
                            map.put(Constant.DATE, date);
                            map.put(Constant.NAME, name);
                            map.put(Constant.CONTACT, contact);

                            //LoadImage.execute(map);
                            list.add(map);
                        }
                        lv.setAdapter(new CustomAdapter(PetGallery.this, list));
                        mProgressHUD.dismiss();
                    } else {
                        mProgressHUD.dismiss();
                        Toast.makeText(getApplicationContext(), "Data not found", Toast.LENGTH_SHORT).show();
                    }

                } catch (Exception e) {
                    Log.e("Json Error", e.getMessage());
                }
            }

        }

        @Override
        public void onCancel(DialogInterface dialog) {
            this.cancel(true);
            mProgressHUD.dismiss();
        }
    }


Post Method:

 class GetTask extends AsyncTask<String, Void, String> implements DialogInterface.OnCancelListener{

        ProgressHUD mProgressHUD;

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            mProgressHUD = ProgressHUD.show(Pet.this,"Loading", false,false, this);
        }

        @Override
        protected String doInBackground(String... params) {

            URL url;
            String response = "";
            try {

                SharedPreferences preferences = getSharedPreferences("Pet", 0);
                String id = preferences.getString("id", null);
                String data = URLEncoder.encode("pet_id", "UTF-8") + "=" + URLEncoder.encode(id, "UTF-8");

                url = new URL("http://www.imstrong.info/ws/get_pet.php");
                HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                conn.setReadTimeout(15000);
                conn.setConnectTimeout(15000);
                conn.setRequestMethod("POST");
                conn.setDoInput(true);
                conn.setDoOutput(true);


                OutputStream os = conn.getOutputStream();
                BufferedWriter writer = new BufferedWriter(
                        new OutputStreamWriter(os, "UTF-8"));
                writer.write(data);

                writer.flush();
                writer.close();
                os.close();

                conn.connect();
                int responseCode=conn.getResponseCode();

                if (responseCode == HttpsURLConnection.HTTP_OK) {
                    String line;
                    BufferedReader br=new BufferedReader(new InputStreamReader(conn.getInputStream()));
                    while ((line=br.readLine()) != null) {
                        response+=line;
                    }
                }
                else {
                    response=String.valueOf(responseCode);

                }
            } catch (Exception e) {
                e.printStackTrace();
            }

            return response;
        }

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            //Toast.makeText(getApplicationContext(), s, Toast.LENGTH_SHORT).show();
            mProgressHUD.dismiss();
            if(s!=null) {
                try {
                    JSONObject object = new JSONObject(s);
                    simageurl = object.getString(Constant.PHOTO_STRING);
                    sdetails = object.getString(Constant.DESC);
                    splace = object.getString(Constant.PLACE);
                    sdate = object.getString(Constant.DATE);
                    sname = object.getString(Constant.NAME);
                    scontact = object.getString(Constant.CONTACT);

                    details.setText(sdetails);
                    place.setText(splace);
                    date.setText("(" + sdate + ")");
                    name.setText(sname);
                    contact.setText(scontact);

                    if(simageurl!=null){
                        Bitmap bitmap = getBitmapFromURL(simageurl);
                        photo.setImageBitmap(bitmap);
                    }else{
                        photo.setImageResource(R.drawable.logo);
                    }


                }catch(Exception e){
                    Log.e("Json Responce : ", e.getMessage());
                }
            }
        }

        @Override
        public void onCancel(DialogInterface dialog) {
            this.cancel(true);
            mProgressHUD.dismiss();
        }
    }