Android Kakao SDK v2 Java로 사용하기 - 카카오 로그인

환경 설정 공식 가이드 : https://developers.kakao.com/docs/latest/ko/getting-started/sdk-android

카카오 로그인 Android SDK 공식 가이드 : https://developers.kakao.com/docs/latest/ko/kakaologin/android#before-you-begin

 

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사전 체크 1. android studio 최신 Fox버전을 사용하는 경우, settings.gradle 설정 추가

dependencyResolutionManagement {
    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
    repositories {
        google()
        mavenCentral()
        maven { url 'https://devrepo.kakao.com/nexus/content/groups/public/' }
    }
}
rootProject.name = "TestRestAPIForJava"
include ':app'

사전 체크 2. build.gradle (Module) 설정

plugins {
    id 'com.android.application'
}

android {
    compileSdk 31

    defaultConfig {
        applicationId "패키지명"
        minSdk 21
        targetSdk 30
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
}

dependencies {

    implementation 'androidx.appcompat:appcompat:1.4.0'
    implementation 'com.google.android.material:material:1.4.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.1.2'
    testImplementation 'junit:junit:4.+'
    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'

    //Kakao SDK
    implementation "com.kakao.sdk:v2-user:2.8.3" // 카카오 로그인
    implementation "com.kakao.sdk:v2-talk:2.8.3" // 친구, 메시지(카카오톡)
    implementation "com.kakao.sdk:v2-story:2.8.3" // 카카오스토리
    implementation "com.kakao.sdk:v2-link:2.8.3" // 메시지(카카오링크)
    implementation "com.kakao.sdk:v2-navi:2.8.3" // 카카오내비
}

사전 체크 3. GlobalApplication 클래스 추가

import android.app.Application;
import com.kakao.sdk.common.KakaoSdk;

public class GlobalApplication extends Application {
    private static GlobalApplication instance;

    @Override
    public void onCreate() {
        super.onCreate();
        instance = this;

        // 네이티브 앱 키로 초기화
        KakaoSdk.init(this, "{네이티브 앱키}");
    }
}

사전 체크 4. AndroidManifest.xml 설정

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="패키지명">

    <!-- 인터넷 사용 권한 설정 -->
    <uses-permission android:name="android.permission.INTERNET" />

    <application
        android:name=".GlobalApplication"
        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/Theme.TestRestAPIForJava">
        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name="com.kakao.sdk.auth.AuthCodeHandlerActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />
                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.BROWSABLE" />

                <!-- Redirect URI: "kakao{NATIVE_APP_KEY}://oauth" -->
                <data android:host="oauth"
                    android:scheme="kakao{NATIVE_APP_KEY}" />
            </intent-filter>
        </activity>
    </application>

</manifest>

사전 체크 5. 키해시 조회 및 등록

import androidx.appcompat.app.AppCompatActivity;

import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.Signature;
import android.os.Bundle;
import android.util.Base64;
import android.util.Log;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MainActivity extends AppCompatActivity {

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

        Log.d("KeyHash", getKeyHash());
    }

    // 키해시 얻기
    public String getKeyHash(){
        try{
            PackageInfo packageInfo = getPackageManager().getPackageInfo(getPackageName(), PackageManager.GET_SIGNATURES);
            if(packageInfo == null) return null;
            for(Signature signature: packageInfo.signatures){
                try{
                    MessageDigest md = MessageDigest.getInstance("SHA");
                    md.update(signature.toByteArray());
                    return android.util.Base64.encodeToString(md.digest(), Base64.NO_WRAP);
                }catch (NoSuchAlgorithmException e){
                    Log.w("getKeyHash", "Unable to get MessageDigest. signature="+signature, e);
                }
            }
        }catch(PackageManager.NameNotFoundException e){
            Log.w("getPackageInfo", "Unable to getPackageInfo");
        }
        return null;
    }
}

---

1. 카카오 로그인 버튼 추가

2. activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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=".MainActivity">

    <ImageButton
        android:id="@+id/kakao_login_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/kakao_login_button"
        android:background="@android:color/transparent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        android:layout_marginBottom="40dp"
        />

</androidx.constraintlayout.widget.ConstraintLayout>

3. MainActovity

import androidx.appcompat.app.AppCompatActivity;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.Signature;
import android.os.Bundle;
import android.util.Base64;
import android.util.Log;
import android.view.View;
import android.widget.ImageButton;

import com.kakao.sdk.user.UserApiClient;
import com.kakao.sdk.user.model.Account;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MainActivity extends AppCompatActivity {

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

        Log.d("KeyHash", getKeyHash());

        ImageButton kakao_login_button = (ImageButton)findViewById(R.id.kakao_login_button);
        kakao_login_button.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v) {
                if(UserApiClient.getInstance().isKakaoTalkLoginAvailable(MainActivity.this)){
                    login();
                }
                else{
                    accountLogin();
                }
            }
        });
    }

    public void login(){
        String TAG = "login()";
        UserApiClient.getInstance().loginWithKakaoTalk(MainActivity.this,(oAuthToken, error) -> {
            if (error != null) {
                Log.e(TAG, "로그인 실패", error);
            } else if (oAuthToken != null) {
                Log.i(TAG, "로그인 성공(토큰) : " + oAuthToken.getAccessToken());
                getUserInfo();
            }
            return null;
        });
    }

    public void accountLogin(){
        String TAG = "accountLogin()";
        UserApiClient.getInstance().loginWithKakaoAccount(MainActivity.this,(oAuthToken, error) -> {
            if (error != null) {
                Log.e(TAG, "로그인 실패", error);
            } else if (oAuthToken != null) {
                Log.i(TAG, "로그인 성공(토큰) : " + oAuthToken.getAccessToken());
                getUserInfo();
            }
            return null;
        });
    }

    public void getUserInfo(){
        String TAG = "getUserInfo()";
        UserApiClient.getInstance().me((user, meError) -> {
            if (meError != null) {
                Log.e(TAG, "사용자 정보 요청 실패", meError);
            } else {
                System.out.println("로그인 완료");
                Log.i(TAG, user.toString());
                {
                    Log.i(TAG, "사용자 정보 요청 성공" +
                            "\n회원번호: "+user.getId() +
                            "\n이메일: "+user.getKakaoAccount().getEmail());
                }
                Account user1 = user.getKakaoAccount();
                System.out.println("사용자 계정" + user1);
            }
            return null;
        });
    }

    // 키해시 얻기
    public String getKeyHash(){
        try{
            PackageInfo packageInfo = getPackageManager().getPackageInfo(getPackageName(), PackageManager.GET_SIGNATURES);
            if(packageInfo == null) return null;
            for(Signature signature: packageInfo.signatures){
                try{
                    MessageDigest md = MessageDigest.getInstance("SHA");
                    md.update(signature.toByteArray());
                    return android.util.Base64.encodeToString(md.digest(), Base64.NO_WRAP);
                }catch (NoSuchAlgorithmException e){
                    Log.w("getKeyHash", "Unable to get MessageDigest. signature="+signature, e);
                }
            }
        }catch(PackageManager.NameNotFoundException e){
            Log.w("getPackageInfo", "Unable to getPackageInfo");
        }
        return null;
    }
}