이번에는 로그인 및 메인화면을 구현하는 예제입니다.

저번 소스에서 Login.php이 잘못되었네요.

다음 파일이 제대로 된 소스입니다.

Login.php

<?php
    $con = mysqli_connect('localhost', 'root', 'qwer1234', 'proj_manager');

     $userID = $_POST["userID"];
     $userPassword = $_POST["userPassword"];

     $statement = mysqli_prepare($con, "SELECT * FROM USER WHERE userID = ? AND userPassword = ?");
     mysqli_stmt_bind_param($statement, "ss", $userID, $userPassword);
     mysqli_stmt_execute($statement);
     mysqli_stmt_store_result($statement);
     mysqli_stmt_bind_result($statement, $userID, $userPassword, $userName, $userAge);

     $response = array();
     $response["success"] = false;

     while(mysqli_stmt_fetch($statement)){
      $response["success"] = true;
      $response["userID"] = $userID;
      $response["userPassword"] = $userPassword;
      $response["userName"] = $userName;
      $response["userAge"] = $userAge;
     }

     echo json_encode($response);
?>

LoginRequest.java

package com.example.kch.proj_manager_v4;

import com.android.volley.AuthFailureError;
import com.android.volley.Response;
import com.android.volley.toolbox.StringRequest;

import java.util.HashMap;
import java.util.Map;


public class LoginRequest extends StringRequest {

    //현재 안드로이드앱을 에뮬레이터로 돌리므로 에뮬레이터가 설치된 서버에 있는 아파치 서버에 접근하려면
    //다음과 같이 10.0.2.2:포트번호 로 접근해야합니다 저는 8080 포트를 써서 다음과 같이 했습니다
    final static private String URL = "http://10.0.2.2:8080/Login.php";
    private Map<String, String> parameters;

    //생성자
    public LoginRequest(String userID, String userPassword, Response.Listener<String> listener){
        super(Method.POST, URL, listener, null);
        parameters = new HashMap<>();
        parameters.put("userID", userID);
        parameters.put("userPassword", userPassword);
    }

    //추후 사용을 위한 부분
    @Override
    protected Map<String, String> getParams() throws AuthFailureError {
        return parameters;
    }
}


LoginActivity.java

package com.example.kch.proj_manager_v4;

import android.content.Intent;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.toolbox.Volley;

import org.json.JSONException;
import org.json.JSONObject;

public class LoginActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);

        //강의에서 final을 추가시켜줌
        final EditText idText = (EditText)findViewById(R.id.idText);
        final EditText passwordText = (EditText)findViewById(R.id.passwordText);
        final Button loginbtn = (Button)findViewById(R.id.loginbtn);
        final TextView registerbtn = (TextView)findViewById(R.id.registerbtn);

        registerbtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent registerIntent = new Intent(LoginActivity.this, RegisterActivity.class);
                LoginActivity.this.startActivity(registerIntent);
            }
        });

        loginbtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                final String userID = idText.getText().toString();
                final String userPassword = passwordText.getText().toString();


                //4. 콜백 처리부분(volley 사용을 위한 ResponseListener 구현 부분)
                Response.Listener<String> responseListener = new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        try{
                            JSONObject jsonResponse = new JSONObject(response);
                            boolean success = jsonResponse.getBoolean("success");

                            Toast.makeText(getApplicationContext(), "success"+success, Toast.LENGTH_SHORT).show();

                            //서버에서 보내준 값이 true이면?
                            if(success){

                                //Toast.makeText(getApplicationContext(), "success", Toast.LENGTH_SHORT).show();

                                String userID = jsonResponse.getString("userID");
                                String userPassword = jsonResponse.getString("userPassword");

                                //로그인에 성공했으므로 MainActivity로 넘어감
                                Intent intent = new Intent(LoginActivity.this, MainActivity.class);
                                intent.putExtra("userID", userID);
                                intent.putExtra("userPassword", userPassword);
                                LoginActivity.this.startActivity(intent);

                            }else{//로그인 실패시
                                AlertDialog.Builder builder = new AlertDialog.Builder(LoginActivity.this);
                                builder.setMessage("Login failed")
                                        .setNegativeButton("retry", null)
                                        .create()
                                        .show();


                            }

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

                LoginRequest loginRequest = new LoginRequest(userID, userPassword, responseListener);
                RequestQueue queue = Volley.newRequestQueue(LoginActivity.this);
                queue.add(loginRequest);
            }
        });

    }
}




실행 화면

다음과 같이 등록한 아이디와 패스워드를 입력하고 Login 버튼을 누르면


다음과 같이 로그인에 성공하게 되고 메인화면으로 가게됩니다.



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