各位大神好，我是android菜鳥，
今日參考其他人的寫法，好不容易連上databese 也能打結果打印，
但遇到onPostExecute 這種要怎樣返回value
我google一下 很多人方法都不一樣，參考來改也得不出個所以，
所以想在這邊請教一下大神有沒有提供一些意見。

    public class InfoAsyncTask extends AsyncTask<Void, Void, Map<String, String>> {
        @Override
        protected Map<String, String> doInBackground(Void... voids) {
            Map<String, String> info = new HashMap<>();
            try {
                Class.forName("com.mysql.jdbc.Driver");
            } catch (ClassNotFoundException e) {
                e.printStackTrace();
            }
            try (Connection connection = DriverManager.getConnection(URL, USER, PASSWORD)) {
                String sql = "SELECT * from confinement WHERE ID = "+id;
                PreparedStatement statement = connection.prepareStatement(sql);
                ResultSet resultSet = statement.executeQuery();
                if (resultSet.next()) {
                    info.put("RTSP", resultSet.getString("RTSP"));
                }
            } catch (Exception e) {
                Log.e("InfoAsyncTask", "Error reading school information", e);
            }
            return info;
        }


        public void onPostExecute(Map<String, String> result) {
            if (!result.isEmpty()) {
                url = result.get("RTSP");
            }
        }
    }