[Android / Java] firebase를 이용한 구글 로그인 연동
지난 시간 firebase와 연동을 했다면 어렵지 않게 작업할 수 있을 것이다.
https://minggu92.tistory.com/75
저번에 firebase-sample-java로 만들어서 먼저 java로 작업을 해보도록 하겠다.
1. firebase console에 구글 인증 추가
Authentication 클릭
구글 클릭하고 내 메일 넣으면
짜잔.
등록을 안 하면 ApiException 12500 에러가 뜬다!
2. 구글 인증을 위한 SDK 추가
App수준 Gradle 추가
plugins {
id 'com.android.application'
id 'com.google.gms.google-services' //구글서비스 추가
}
android {
compileSdk 32
defaultConfig {
applicationId "com.example.firebase_sample"
minSdk 21
targetSdk 32
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:1.4.1'
implementation 'com.google.android.material:material:1.5.0'
implementation 'androidx.constraintlayout:constraintlayout:2.1.3'
testImplementation 'junit:junit:4.13.2'
androidTestImplementation 'androidx.test.ext:junit:1.1.3'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
// Import the Firebase BoM
implementation platform('com.google.firebase:firebase-bom:29.2.0')
// Add the dependency for the Firebase SDK for Google Analytics
// When using the BoM, don't specify versions in Firebase dependencies
implementation 'com.google.firebase:firebase-analytics'
// Add the dependencies for any other desired Firebase products
// https://firebase.google.com/docs/android/setup#available-libraries
// Declare the dependency for the Firebase Authentication library
// When using the BoM, you don't specify versions in Firebase library dependencies
implementation 'com.google.firebase:firebase-auth'
// Also declare the dependency for the Google Play services library and specify its version
implementation 'com.google.android.gms:play-services-auth:20.1.0'
}
3. layout 수정
가볍게 구글 로그인 버튼과 로그아웃 버튼을 만들어보자.
activity_main.xml에 버튼을 추가해준다.
<?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">
<com.google.android.gms.common.SignInButton
android:id="@+id/btn_google_sign_in"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/btn_logout_google"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="구글 로그아웃"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_bias="0.498"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.587" />
</androidx.constraintlayout.widget.ConstraintLayout>
4. strings.xml 추가
<resources>
<string name="app_name">firebase-sample</string>
<string name="success_login">구글 로그인 성공</string>
<string name="failed_login">구글 로그인 실패</string>
<string name="success_logout">로그아웃 되었습니다</string>
<string name="status_login">이미 로그인 되어있습니다</string>
</resources>
미리 토스트 메시지요 문자열을 추가해두자.
5. MainActivity 수정
5.1) GoogleSignInOptions 객체 선언
근데 저 default_web_client_id는 아래 google cloud platform에서 확인할 수 있는데
내가 설정 안 해도 자동으로 firebase가 만들어주더라.....
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 파이어베이스 인증 객체 선언
mAuth = FirebaseAuth.getInstance();
// Google 로그인을 앱에 통합
// GoogleSignInOptions 개체를 구성할 때 requestIdToken을 호출
GoogleSignInOptions googleSignInOptions = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestIdToken(getString(R.string.default_web_client_id))
.requestEmail()
.build();
mGoogleSignInClient = GoogleSignIn.getClient(this, googleSignInOptions);
btnGoogleLogin = findViewById(R.id.btn_google_sign_in);
btnGoogleLogin.setOnClickListener(view -> {
// 기존에 로그인 했던 계정을 확인한다.
gsa = GoogleSignIn.getLastSignedInAccount(MainActivity.this);
if (gsa != null) // 로그인 되있는 경우
Toast.makeText(MainActivity.this, R.string.status_login, Toast.LENGTH_SHORT).show();
else
signIn();
});
btnLogoutGoogle = findViewById(R.id.btn_logout_google);
btnLogoutGoogle.setOnClickListener(view -> {
signOut(); //로그아웃
});
}
공식문서는 간단하게 만들었지만 우리는 버튼도 만들어뒀으니 클릭이벤트도 달아주자.
기존에 로그인했더라면 이미 로그인되어있다는 토스트 메시지를 띄워줄 것이다.
5.2) 로그인 처리(onActivityResult)
로그인 처리가 정상적으로 이루어지면 GoogleSignInAccount 객체를 받아온다.
private void signIn(){
Intent signInIntent = mGoogleSignInClient.getSignInIntent();
startActivityForResult(signInIntent, RC_SIGN_IN);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
// Result returned from launching the Intent from GoogleSignInClient.getSignInIntent(...);
if (requestCode == RC_SIGN_IN) {
// The Task returned from this call is always completed, no need to attach a listener.
Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(data);
handleSignInResult(task);
}
}
Intent와 함께 넘긴 RC_SIGN_IN 상수를 제대로 돌려받았다면 Task 객체를 가져와 handleSignInResult 함수에 태워주자.
5.3) 로그인 후처리 (계정 정보 가져오기)
/* 사용자 정보 가져오기 */
private void handleSignInResult(Task<GoogleSignInAccount> completedTask) {
try {
GoogleSignInAccount acct = completedTask.getResult(ApiException.class);
if (acct != null) {
firebaseAuthWithGoogle(acct.getIdToken());
String personName = acct.getDisplayName();
String personGivenName = acct.getGivenName();
String personFamilyName = acct.getFamilyName();
String personEmail = acct.getEmail();
String personId = acct.getId();
Uri personPhoto = acct.getPhotoUrl();
Log.d(TAG, "handleSignInResult:personName "+personName);
Log.d(TAG, "handleSignInResult:personGivenName "+personGivenName);
Log.d(TAG, "handleSignInResult:personEmail "+personEmail);
Log.d(TAG, "handleSignInResult:personId "+personId);
Log.d(TAG, "handleSignInResult:personFamilyName "+personFamilyName);
Log.d(TAG, "handleSignInResult:personPhoto "+personPhoto);
}
} catch (ApiException e) {
// The ApiException status code indicates the detailed failure reason.
// Please refer to the GoogleSignInStatusCodes class reference for more information.
Log.e(TAG, "signInResult:failed code=" + e.getStatusCode());
}
}
// [START auth_with_google]
private void firebaseAuthWithGoogle(String idToken) {
AuthCredential credential = GoogleAuthProvider.getCredential(idToken, null);
mAuth.signInWithCredential(credential)
.addOnCompleteListener(this, task -> {
if (task.isSuccessful()) {
// Sign in success, update UI with the signed-in user's information
Log.d(TAG, "signInWithCredential:success");
Toast.makeText(MainActivity.this, R.string.success_login, Toast.LENGTH_SHORT).show();
FirebaseUser user = mAuth.getCurrentUser();
// updateUI(user);
} else {
// If sign in fails, display a message to the user.
Log.w(TAG, "signInWithCredential:failure", task.getException());
Toast.makeText(MainActivity.this, R.string.failed_login, Toast.LENGTH_SHORT).show();
// updateUI(null);
}
});
}
성공적으로 로그인이 되었을 때 FirebaseAuth 객체의 공유 인스턴스를 가져오고 GoogleSignInAccount 객체에서 ID 토큰을 가져와서 Firebase 사용자 인증 정보로 교환한다.
ui 업데이트하는 메서드는 지금 따로 ui가 없으니까 뭐 주석처리를 하고
5.4) 로그아웃 및 계정 삭제처리
/* 로그아웃 */
private void signOut() {
mGoogleSignInClient.signOut()
.addOnCompleteListener(this, task -> {
mAuth.signOut();
Toast.makeText(MainActivity.this, R.string.success_logout, Toast.LENGTH_SHORT).show();
// ...
});
gsa = null;
}
/* 회원 삭제요청 */
private void revokeAccess() {
mGoogleSignInClient.revokeAccess()
.addOnCompleteListener(this, task -> {
// ...
});
}
공식문서는 FirebaseAuth인스턴스만 로그아웃하지만 GoogleSignInClient도 같이 로그아웃해주도록 하자.
5. 최종본 및 테스트
package com.example.firebase_sample;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.widget.Button;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import com.google.android.gms.auth.api.signin.GoogleSignIn;
import com.google.android.gms.auth.api.signin.GoogleSignInAccount;
import com.google.android.gms.auth.api.signin.GoogleSignInClient;
import com.google.android.gms.auth.api.signin.GoogleSignInOptions;
import com.google.android.gms.common.SignInButton;
import com.google.android.gms.common.api.ApiException;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthCredential;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.auth.GoogleAuthProvider;
public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
private static final int RC_SIGN_IN = 9001;
// 구글api클라이언트
private GoogleSignInClient mGoogleSignInClient;
// 구글 계정
private GoogleSignInAccount gsa;
// 파이어베이스 인증 객체 생성
private FirebaseAuth mAuth;
// 구글 로그인 버튼
private SignInButton btnGoogleLogin;
private Button btnLogoutGoogle;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 파이어베이스 인증 객체 선언
mAuth = FirebaseAuth.getInstance();
// Google 로그인을 앱에 통합
// GoogleSignInOptions 개체를 구성할 때 requestIdToken을 호출
GoogleSignInOptions googleSignInOptions = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestIdToken(getString(R.string.default_web_client_id))
.requestEmail()
.build();
mGoogleSignInClient = GoogleSignIn.getClient(this, googleSignInOptions);
btnGoogleLogin = findViewById(R.id.btn_google_sign_in);
btnGoogleLogin.setOnClickListener(view -> {
// 기존에 로그인 했던 계정을 확인한다.
gsa = GoogleSignIn.getLastSignedInAccount(MainActivity.this);
if (gsa != null) // 로그인 되있는 경우
Toast.makeText(MainActivity.this, R.string.status_login, Toast.LENGTH_SHORT).show();
else
signIn();
});
btnLogoutGoogle = findViewById(R.id.btn_logout_google);
btnLogoutGoogle.setOnClickListener(view -> {
signOut(); //로그아웃
});
}
private void signIn(){
Intent signInIntent = mGoogleSignInClient.getSignInIntent();
startActivityForResult(signInIntent, RC_SIGN_IN);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
// Result returned from launching the Intent from GoogleSignInClient.getSignInIntent(...);
if (requestCode == RC_SIGN_IN) {
// The Task returned from this call is always completed, no need to attach a listener.
Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(data);
handleSignInResult(task);
}
}
/* 사용자 정보 가져오기 */
private void handleSignInResult(Task<GoogleSignInAccount> completedTask) {
try {
GoogleSignInAccount acct = completedTask.getResult(ApiException.class);
if (acct != null) {
firebaseAuthWithGoogle(acct.getIdToken());
String personName = acct.getDisplayName();
String personGivenName = acct.getGivenName();
String personFamilyName = acct.getFamilyName();
String personEmail = acct.getEmail();
String personId = acct.getId();
Uri personPhoto = acct.getPhotoUrl();
Log.d(TAG, "handleSignInResult:personName "+personName);
Log.d(TAG, "handleSignInResult:personGivenName "+personGivenName);
Log.d(TAG, "handleSignInResult:personEmail "+personEmail);
Log.d(TAG, "handleSignInResult:personId "+personId);
Log.d(TAG, "handleSignInResult:personFamilyName "+personFamilyName);
Log.d(TAG, "handleSignInResult:personPhoto "+personPhoto);
}
} catch (ApiException e) {
// The ApiException status code indicates the detailed failure reason.
// Please refer to the GoogleSignInStatusCodes class reference for more information.
Log.e(TAG, "signInResult:failed code=" + e.getStatusCode());
}
}
// [START auth_with_google]
private void firebaseAuthWithGoogle(String idToken) {
AuthCredential credential = GoogleAuthProvider.getCredential(idToken, null);
mAuth.signInWithCredential(credential)
.addOnCompleteListener(this, task -> {
if (task.isSuccessful()) {
// Sign in success, update UI with the signed-in user's information
Log.d(TAG, "signInWithCredential:success");
Toast.makeText(MainActivity.this, R.string.success_login, Toast.LENGTH_SHORT).show();
FirebaseUser user = mAuth.getCurrentUser();
// updateUI(user);
} else {
// If sign in fails, display a message to the user.
Log.w(TAG, "signInWithCredential:failure", task.getException());
Toast.makeText(MainActivity.this, R.string.failed_login, Toast.LENGTH_SHORT).show();
// updateUI(null);
}
});
}
private void updateUI(FirebaseUser user) {
}
/* 로그아웃 */
private void signOut() {
mGoogleSignInClient.signOut()
.addOnCompleteListener(this, task -> {
mAuth.signOut();
Toast.makeText(MainActivity.this, R.string.success_logout, Toast.LENGTH_SHORT).show();
// ...
});
gsa = null;
}
/* 회원 삭제요청 */
private void revokeAccess() {
mGoogleSignInClient.revokeAccess()
.addOnCompleteListener(this, task -> {
// ...
});
}
}
디버그 로그
/MainActivity: handleSignInResult:personName 밍구
D/MainActivity: handleSignInResult:personGivenName 밍구
D/MainActivity: handleSignInResult:personEmail --@gmail.com
D/MainActivity: handleSignInResult:personId --
D/MainActivity: handleSignInResult:personFamilyName --
D/MainActivity: handleSignInResult:personPhoto --
전체 소스는 github에 올려두었다.
https://github.com/minha9012/firebase-sample
<참고>
https://firebase.google.com/docs/auth/android/google-signin
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