홍드로이드의 야매코딩

#29 안드로이드 스튜디오 로그인&회원가입 (Login&Register) 예제 [ 홍드로이드 ] 본문

Android Java

#29 안드로이드 스튜디오 로그인&회원가입 (Login&Register) 예제 [ 홍드로이드 ]

홍드로이드 2020. 6. 26. 15:48

최근 androidx 라는 새로운 지원 라이브러리가 출시하여서 안드로이드 스튜디오 최신버전을 쓰는 구독자 여러분들께서 제 예제를 올바르게 구현하였는데도 빈번하게 에러가 나실 수 있습니다. 왜냐하면 최신버전 안드로이드 스튜디오 에서는 new project로 만들 시 androidx 지원 라이브러리가 기본적으로 체크박스 되어있기 때문입니다. 예제마다 오류가 발생하게되면 최대한 androidx 에 맞춰서 예제영상 고정댓글란에 에러대응법을 찾아서 적도록 하겠습니다. 2019년 즈음 이후의 여러분들께서는 저의 예제가 support 라이브러리를 이용하여 구현했기때문에
androidx 마이그레이션 방법을 공부해두시길 부탁드립니다.
for example ) import android.support.v7.app.AppCompatActivity; -> import androidx.appcompat.app.AppCompatActivity;



build.gradle dependency에 http통신 volley 라이브러리 추가

implementation 'com.android.volley:volley:1.1.1'





<AndroidManifest.xml>

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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.hongdroid.registerloginexample">
 
 
    <uses-permission android:name="android.permission.INTERNET" /> <!-- 인터넷 권한 선언-->
 
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme"
        android:usesCleartextTraffic="true"> <!-- Android 9 버전부터 이 옵션 추가해야함. http 보안관련 때문에.. -->
        <activity android:name=".LoginActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
 
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".RegisterActivity" />
        <activity android:name=".MainActivity">
 
        </activity>
    </application>
 
</manifest>
cs







<activity_main.xml>

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<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
 
    <TextView
        android:id="@+id/textView5"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="100dp"
        android:text="Hello World!"
        android:textSize="30sp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
 
    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:text="아이디"
        android:textSize="24sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView5" />
 
    <TextView
        android:id="@+id/tv_id"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:text="TextView"
        android:textSize="30sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView" />
 
    <TextView
        android:id="@+id/textView3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:text="비밀번호"
        android:textSize="24sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/tv_id" />
 
    <TextView
        android:id="@+id/tv_pass"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:text="TextView"
        android:textSize="30sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView3" />
 
</android.support.constraint.ConstraintLayout>
cs




<activity_register.xml>

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<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".RegisterActivity">
 
    <EditText
        android:id="@+id/et_id"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginTop="200dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:ems="10"
        android:hint="아이디"
        android:inputType="textPersonName"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
 
    <EditText
        android:id="@+id/et_pass"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:ems="10"
        android:hint="비밀번호"
        android:inputType="textPersonName"
        app:layout_constraintEnd_toEndOf="@+id/et_id"
        app:layout_constraintStart_toStartOf="@+id/et_id"
        app:layout_constraintTop_toBottomOf="@+id/et_id" />
 
    <EditText
        android:id="@+id/et_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:ems="10"
        android:hint="이름"
        android:inputType="textPersonName"
        app:layout_constraintEnd_toEndOf="@+id/et_pass"
        app:layout_constraintStart_toStartOf="@+id/et_pass"
        app:layout_constraintTop_toBottomOf="@+id/et_pass" />
 
    <EditText
        android:id="@+id/et_age"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:ems="10"
        android:hint="나이"
        android:inputType="textPersonName"
        app:layout_constraintEnd_toEndOf="@+id/et_name"
        app:layout_constraintStart_toStartOf="@+id/et_name"
        app:layout_constraintTop_toBottomOf="@+id/et_name" />
 
    <Button
        android:id="@+id/btn_register"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:text="회원가입"
        app:layout_constraintEnd_toEndOf="@+id/et_age"
        app:layout_constraintStart_toStartOf="@+id/et_age"
        app:layout_constraintTop_toBottomOf="@+id/et_age" />
</android.support.constraint.ConstraintLayout>
cs




<activity_login.xml>

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<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".LoginActivity">
 
    <EditText
        android:id="@+id/et_id"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginTop="200dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:ems="10"
        android:hint="아이디"
        android:inputType="textPersonName"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
 
    <EditText
        android:id="@+id/et_pass"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginTop="32dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:ems="10"
        android:hint="비밀번호"
        android:inputType="textPersonName"
        app:layout_constraintEnd_toEndOf="@+id/et_id"
        app:layout_constraintStart_toStartOf="@+id/et_id"
        app:layout_constraintTop_toBottomOf="@+id/et_id" />
 
    <Button
        android:id="@+id/btn_login"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="32dp"
        android:text="로그인"
        app:layout_constraintEnd_toEndOf="@+id/et_pass"
        app:layout_constraintStart_toStartOf="@+id/et_pass"
        app:layout_constraintTop_toBottomOf="@+id/et_pass" />
 
    <Button
        android:id="@+id/btn_register"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="32dp"
        android:text="회원가입"
        app:layout_constraintEnd_toEndOf="@+id/btn_login"
        app:layout_constraintStart_toStartOf="@+id/btn_login"
        app:layout_constraintTop_toBottomOf="@+id/btn_login" />
</android.support.constraint.ConstraintLayout>
cs






<RegisterRequest.java>

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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 RegisterRequest extends StringRequest {
 
    // 서버 URL 설정 ( PHP 파일 연동 )
    final static private String URL = "http://닷홈아디.dothome.co.kr/Register.php";
    private Map<String, String> map;
 
 
    public RegisterRequest(String userID, String userPassword, String userName, int userAge, Response.Listener<String> listener) {
        super(Method.POST, URL, listener, null);
 
        map = new HashMap<>();
        map.put("userID",userID);
        map.put("userPassword", userPassword);
        map.put("userName", userName);
        map.put("userAge", userAge + "");
    }
 
    @Override
    protected Map<String, String> getParams() throws AuthFailureError {
        return map;
    }
}
cs




<LoginRequest.java>

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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 {
 
    // 서버 URL 설정 ( PHP 파일 연동 )
    final static private String URL = "http://닷홈아디.dothome.co.kr/Login.php";
    private Map<String, String> map;
 
 
    public LoginRequest(String userID, String userPassword, Response.Listener<String> listener) {
        super(Method.POST, URL, listener, null);
 
        map = new HashMap<>();
        map.put("userID",userID);
        map.put("userPassword", userPassword);
 
    }
 
    @Override
    protected Map<String, String> getParams() throws AuthFailureError {
        return map;
    }
}
cs





<RegisterActivity.java>

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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.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 RegisterActivity extends AppCompatActivity {
 
    private EditText et_id, et_pass, et_name, et_age;
    private Button btn_register;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) { // 액티비티 시작시 처음으로 실행되는 생명주기!
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_register);
 
        // 아이디 값 찾아주기
        et_id = findViewById(R.id.et_id);
        et_pass = findViewById(R.id.et_pass);
        et_name = findViewById(R.id.et_name);
        et_age = findViewById(R.id.et_age);
 
        // 회원가입 버튼 클릭 시 수행
        btn_register = findViewById(R.id.btn_register);
        btn_register.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                // EditText에 현재 입력되어있는 값을 get(가져온다)해온다.
                String userID = et_id.getText().toString();
                String userPass = et_pass.getText().toString();
                String userName = et_name.getText().toString();
                int userAge = Integer.parseInt(et_age.getText().toString());
 
                Response.Listener<String> responseListener = new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        try {
                            JSONObject jsonObject = new JSONObject(response);
                            boolean success = jsonObject.getBoolean("success");
                            if (success) { // 회원등록에 성공한 경우
                                Toast.makeText(getApplicationContext(),"회원 등록에 성공하였습니다.",Toast.LENGTH_SHORT).show();
                                Intent intent = new Intent(RegisterActivity.this, LoginActivity.class);
                                startActivity(intent);
                            } else { // 회원등록에 실패한 경우
                                Toast.makeText(getApplicationContext(),"회원 등록에 실패하였습니다.",Toast.LENGTH_SHORT).show();
                                return;
                            }
                        } catch (JSONException e) {
                            e.printStackTrace();
                        }
 
                    }
                };
                // 서버로 Volley를 이용해서 요청을 함.
                RegisterRequest registerRequest = new RegisterRequest(userID,userPass,userName,userAge, responseListener);
                RequestQueue queue = Volley.newRequestQueue(RegisterActivity.this);
                queue.add(registerRequest);
 
            }
        });
 
    }
}
cs








<LoginActivity.java>

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import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
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;
 
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
 
public class LoginActivity extends AppCompatActivity {
    private EditText et_id, et_pass;
    private Button btn_login, btn_register;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
 
        et_id = findViewById(R.id.et_id);
        et_pass = findViewById(R.id.et_pass);
        btn_login = findViewById(R.id.btn_login);
        btn_register = findViewById(R.id.btn_register);
 
 
        // 회원가입 버튼을 클릭 시 수행
        btn_register.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(LoginActivity.this, RegisterActivity.class);
                startActivity(intent);
            }
        });
 
        btn_login.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                // EditText에 현재 입력되어있는 값을 get(가져온다)해온다.
                String userID = et_id.getText().toString();
                String userPass = et_pass.getText().toString();
 
                Response.Listener<String> responseListener = new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        try {
                            // TODO : 인코딩 문제때문에 한글 DB인 경우 로그인 불가
                            System.out.println("hongchul" + response);
                            JSONObject jsonObject = new JSONObject(response);
                            boolean success = jsonObject.getBoolean("success");
                            if (success) { // 로그인에 성공한 경우
                                String userID = jsonObject.getString("userID");
                                String userPass = jsonObject.getString("userPassword");
 
                                Toast.makeText(getApplicationContext(),"로그인에 성공하였습니다.",Toast.LENGTH_SHORT).show();
                                Intent intent = new Intent(LoginActivity.this, MainActivity.class);
                                intent.putExtra("userID", userID);
                                intent.putExtra("userPass", userPass);
                                startActivity(intent);
                            } else { // 로그인에 실패한 경우
                                Toast.makeText(getApplicationContext(),"로그인에 실패하였습니다.",Toast.LENGTH_SHORT).show();
                                return;
                            }
                        } catch (JSONException e) {
                            e.printStackTrace();
                        }
                    }
                };
                LoginRequest loginRequest = new LoginRequest(userID, userPass, responseListener);
                RequestQueue queue = Volley.newRequestQueue(LoginActivity.this);
                queue.add(loginRequest);
            }
        });
 
 
    }
}
cs





<MainActivity.java>

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import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
 
public class MainActivity extends AppCompatActivity {
 
    private TextView tv_id, tv_pass;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        tv_id = findViewById(R.id.tv_id);
        tv_pass = findViewById(R.id.tv_pass);
 
 
        Intent intent = getIntent();
        String userID = intent.getStringExtra("userID");
        String userPass = intent.getStringExtra("userPass");
 
        tv_id.setText(userID);
        tv_pass.setText(userPass);
 
    }
}
cs


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