从MySQL数据库登录用户ID

Question

我是Android的新手。

我希望在用户登录时将用户ID存储在MySQL数据库的全局变量中。我已经检查了现有的登录详细信息。现在我想在全局变量中获取该ID。

这是我的代码：

用户登陆

@Override
public void onClick(View view) {

    String email = UsernameEt.getText().toString();
    String password = PasswordEt.getText().toString();
    String type = "login";
    new BackgroundWorker().execute(type,email,password);

    //finish();
    Intent intent = new Intent(UserLogin.this, MainActivity.class);
    startActivity(intent);
    finish();

}

class BackgroundWorker extends AsyncTask<String, String, String>{

    //String result = "";

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

        String type = params[0];
        String login_url = "http://www.mybusket.com/pmsapp/webs/get_all_emp.php";

        try {
            String email_id = params[1];
            String password = params[2];
            URL url = new URL(login_url);
            HttpURLConnection httpURLConnection = (HttpURLConnection)url.openConnection();
            httpURLConnection.setRequestMethod("POST");
            httpURLConnection.setDoOutput(true);
            httpURLConnection.setDoInput(true);
            OutputStream outputStream = httpURLConnection.getOutputStream();
            BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
            String post_data = URLEncoder.encode("email_id", "UTF-8")+"="+URLEncoder.encode(email_id, "UTF-8")+"&"
                    +URLEncoder.encode("password", "UTF-8")+"="+URLEncoder.encode(password, "UTF-8");
            bufferedWriter.write(post_data);
            bufferedWriter.flush();
            bufferedWriter.close();
            outputStream.close();
            InputStream inputStream = httpURLConnection.getInputStream();
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "iso-8859-1"));
            String line="";
            String result="";
            StringBuilder sb = new StringBuilder();
            while ((line = bufferedReader.readLine())!= null) {
                sb.append(line + "\n");
            }
            bufferedReader.close();
            inputStream.close();
            httpURLConnection.disconnect();
            return result;
            //result = sb.toString();
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        return null;
    }

    @Override
    protected void onPostExecute(String result) {
        super.onPostExecute(result);
        /*try {
            //GlobalVariable id;
            JSONObject jsonObject = new JSONObject(result);
            JSONArray array = jsonObject.getJSONArray("emp");
            for (int i = 0; i < array.length(); i++) {
                JSONObject obj = array.getJSONObject(i);
                GlobalVariable g = new GlobalVariable();
                g.setId(obj.getInt("empid"));

            }
        }catch (JSONException e) {
            Log.e("log_tag", "Error parsing data " + e.toString());
            //e.printStackTrace();
        }*/
    }
}

我想将该员工ID存储在全局变量中。我怎么能这样做？