Android应用Google登录Firebase认证成功却未写入实时数据库

问题概述 #

开发Android应用时，Google登录认证流程可正常完成，日志能输出正确的用户信息，但用户数据未按预期写入Firebase Realtime Database。已配置数据库规则允许已认证用户进行读写操作。

当前配置 #

Realtime Database规则 #

{
  "rules": {
    ".read": "auth != null",
    ".write": "auth != null"
  }
}

App级Build Gradle配置 #

plugins {
    id 'com.android.application'
    id 'com.google.gms.google-services'
}

android {
    namespace 'com.arsoftltd.lolipop'
    compileSdk 34

    defaultConfig {
        applicationId "com.arsoftltd.lolipop"
        minSdk 24
        targetSdk 34
        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
    }
    buildFeatures{
        dataBinding true
    }
}

dependencies {

    implementation 'androidx.appcompat:appcompat:1.6.1'
    implementation 'com.google.android.material:material:1.10.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
    testImplementation 'junit:junit:4.13.2'
    androidTestImplementation 'androidx.test.ext:junit:1.1.5'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'


    // Import the Firebase BoM
    implementation platform('com.google.firebase:firebase-bom:32.6.0')

    // When using the BoM, don't specify versions in Firebase dependencies
    implementation 'com.google.firebase:firebase-analytics'

    // Firebase Authentication
    implementation 'com.google.firebase:firebase-auth'
    implementation "com.google.android.gms:play-services-auth:20.7.0"

    implementation 'com.firebaseui:firebase-ui-auth:8.0.2'

    // Firebase realtime database
    implementation "com.google.firebase:firebase-database"


    // Facebook Sdk
    implementation 'com.facebook.android:facebook-android-sdk:[8,9)'

    // SSP SDP library
    implementation 'com.intuit.ssp:ssp-android:1.1.0'
    implementation 'com.intuit.sdp:sdp-android:1.1.0'
}

核心代码片段 #

public class SignInActivity extends AppCompatActivity {    
    private FirebaseAuth auth = FirebaseAuth.getInstance();
    private FirebaseDatabase database = FirebaseDatabase.getInstance();
    private int RC_SIGN_IN = 20;

    // ... 其他初始化代码省略

    private void firebaseAuth(String idToken) {
        AuthCredential credential = GoogleAuthProvider.getCredential(idToken, null);
        auth.signInWithCredential(credential)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        if (task.isSuccessful()) {
                            FirebaseUser user = auth.getCurrentUser();

                            Map<String, Object> map = new HashMap<>();
                            map.put("id", user.getUid());
                            map.put("name", user.getDisplayName());
                            String photoUrl = (user.getPhotoUrl() != null) ? user.getPhotoUrl().toString() : "";
                            map.put("profile", photoUrl);

                            Log.d("FirebaseGoogleAuth", "id" + user.getUid() + " " + user.getDisplayName() + " " + photoUrl);
                            database.getReference()
                                    .child("users")
                                    .child(user.getUid())
                                    .setValue(map)
                                    .addOnCompleteListener(new OnCompleteListener<Void>() {
                                        @Override
                                        public void onComplete(@NonNull Task<Void> task) {
                                            Log.d("FirebaseGoogleAuth", "Data write successful");
                                            Intent intent = new Intent(getApplicationContext(), FeedActivity.class);
                                            startActivity(intent);
                                            finish();
                                        }
                                    })
                                    .addOnFailureListener(new OnFailureListener() {
                                        @Override
                                        public void onFailure(@NonNull Exception e) {
                                            Log.d("FirebaseGoogleAuth", "error realtime database " + e.getMessage().toString());
                                        }
                                    });
                        } else {
                            Toast.makeText(SignInActivity.this, "Authentication failed.", Toast.LENGTH_SHORT).show();
                        }
                    }
                });
    }

    @Override
    protected void onStart() {
        super.onStart();
        FirebaseUser currentUser = auth.getCurrentUser();
        if (currentUser != null){
            startActivity(new Intent(SignInActivity.this, FeedActivity.class));
            finish();
        }
    }
}

认证日志信息 #

2023-11-27 17:17:59.062 28378-28378 FirebaseGoogleAuth com.arsoftltd.lolipop D idpuhGxZmHw7YfW49R4ZGfHJsLmus2 Md Abu Rayhan https://lh3.googleusercontent.com/a/ACg8ocIujr5T5CNmjjEps2SKElmg5ROz0Qbdl0cNcfPAUwcnvQ=s96-c

排查思路与建议 #

• 确认数据库实例指向：检查FirebaseDatabase.getInstance()是否连接到正确的Realtime Database实例，多项目或非默认区域需显式指定URL：FirebaseDatabase.getInstance("https://your-db-url.firebaseio.com/")。
• 查看写入失败日志：重点关注Logcat中error realtime database开头的日志，直接定位权限、网络或数据格式问题。
• 验证认证会话有效性：写入前调用auth.getCurrentUser().getIdToken(true)刷新令牌，确保用户认证状态有效。
• 检查数据库区域配置：若数据库使用非默认区域，需在AndroidManifest.xml添加对应meta-data，或初始化时指定区域，避免连接失败。
• 确认网络状态：测试设备需有稳定网络连接，离线持久化数据需联网后才会同步到云端。
• 核对数据路径：检查Firebase控制台中数据库路径是否为users/{uid}，确认无其他操作意外覆盖数据。
• 临时测试规则：测试环境下可临时将规则设为".write": true，排除规则配置问题。

内容的提问来源于stack exchange，提问作者Md Abu Rayhan