利用Android Studio在App中集成第三方支付

class PaymentTask extends AsyncTask<PaymentRequest, Void, String> {
        @Override
        protected void onPreExecute() {
            //按键点击之后的禁用，防止重复点击
            mCreateOrder.setEnabled(false);
        }
        @Override
        protected String doInBackground(PaymentRequest... pr) {
            PaymentRequest paymentRequest = pr[0];
            String data = null;
            try {
                JSONObject object = new JSONObject();
                object.put("channel", paymentRequest.channel);
                object.put("amount", paymentRequest.amount);
                String json = object.toString();
                //向Your Ping++ Server SDK请求数据
                data = postJson(CHARGE_URL, json);
            } catch (Exception e) {
                e.printStackTrace();
            }
            return data;
        }
        /**
         * 获取charge
         *
         * @param urlStr charge_url
         * @param json   获取charge的传参
         * @return charge
         * @throws IOException
         */
        private String postJson(String urlStr, String json) throws IOException {
            URL url = new URL(urlStr);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setConnectTimeout(8000);
            conn.setReadTimeout(8000);
            conn.setRequestMethod("POST");
            conn.setRequestProperty("Content-Type", "application/json");
            conn.setDoOutput(true);
            conn.setDoInput(true);
            conn.getOutputStream().write(json.getBytes());
            if (conn.getResponseCode() == 200) {
                BufferedReader
                        reader = new BufferedReader(new InputStreamReader(conn.getInputStream(), "utf-8"));
                StringBuilder response = new StringBuilder();
                String line;
                while ((line = reader.readLine()) != null) {
                    response.append(line);
                }
                return response.toString();
            }
            return null;
        }
        /**
         * 获得服务端的charge，调用ping++ sdk。
         */
        @Override
        protected void onPostExecute(String data) {
            if (null == data) {
                showMsg("请求出错", "请检查URL", "URL无法获取charge");
                return;
            }
            Log.d("charge", data);
            //除QQ钱包外，其他渠道调起支付方式：
            //参数一：Activity  当前调起支付的Activity
            //参数二：data  获取到的charge或order的JSON字符串
            Pingpp.createPayment(MainActivity.this, data);
            //QQ钱包调用方式
            //参数一：Activity  当前调起支付的Activity
            //参数二：data  获取到的charge或order的JSON字符串
            //参数三：“qwalletXXXXXXX”需与AndroidManifest.xml中的scheme值一致
            //Pingpp.createPayment(ClientSDKActivity.this, data, "qwalletXXXXXXX");
        }
    }