MainActivity for lLogin

package androdev.loginbasic;

import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    private String URL="http://cavendish.esy.es/pdam/db_login.php";
    private JSONParser jsonParser;
    private static final String SUCCESS_TAG = "SUCCESS";
    private static final String FAILED_TAG = "FAILED";

    EditText user, pass;
    Button login;
    ProgressDialog progressDialog;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        jsonParser = new JSONParser();

        user = (EditText)findViewById(R.id.editUsername);
        pass = (EditText)findViewById(R.id.editPassword);
        login = (Button)findViewById(R.id.btnLogin);

        login.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                new LoginService(user.getText().toString(), pass.getText().toString()).execute();
            }
        });
    }

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

        String username;
        String password;

        public LoginService(String username, String password){
            this.username = username;
            this.password = password;
        }

        @Override
        protected String doInBackground(String... params) {
            int success;
            try{
                //build parameter
                List<NameValuePair> parameter = new ArrayList<NameValuePair>();
                parameter.add(new BasicNameValuePair("Username", username));
                parameter.add(new BasicNameValuePair("Password", password));

                //log watching
                Log.d("request", "starting");

                //create connection http
                JSONObject jsonObject = jsonParser.makeHttpRequest(URL, "GET", parameter);

                //log json respond
                Log.d("request", jsonObject.toString());
                //json usccess tag
                success = jsonObject.getInt(SUCCESS_TAG);

                if(success == 1){
                    Log.d("request", "Login Success"+jsonObject.toString());
                }else{
                    Log.d("request", jsonObject.getString(FAILED_TAG));
                }

            } catch (JSONException e) {
                e.printStackTrace();
            }
            return null;
        }

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            progressDialog = new ProgressDialog(MainActivity.this);
            progressDialog.setMessage("Authentifikasi..");
            progressDialog.setCancelable(true);
            progressDialog.setIndeterminate(false);
            progressDialog.show();
        }

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            progressDialog.dismiss();
        }
    }
}