Firebase身份验证库不存在

Question

我正在为我的项目使用Google Firebase身份验证的官方示例源代码。问题看起来很简单，但实际上并非如此。

我已经声明了对Gradle文件的依赖，如下所示：

// Firebase Authentication
implementation 'com.google.firebase:firebase-auth:16.0.3'

以下导入未按预期进行配置：

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.AuthResult;
import com.google.firebase.auth.EmailAuthProvider;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;

如果我将鼠标悬停在导入上，则会显示Add library com.google.firebase:firebase-auth:16.0.3 to classpath。

app Gradle文件：

apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    // compileSdkVersion 27
    buildToolsVersion '28.0.2'


    defaultConfig {
        applicationId "com.sampletest.app.app"
        minSdkVersion 16
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"


    }

    buildTypes {
       release {
           minifyEnabled false
           proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
       }
    }

    compileOptions {
        sourceCompatibility 1.8
        targetCompatibility 1.8
    }

}

dependencies {
    implementation project(':feature')
    implementation project(':base')

    // implementation 'com.android.support:appcompat-v7:27.1.1'
    // implementation 'com.android.support:animated-vector-drawable:27.1.1'
    // implementation 'com.android.support:cardview-v7:27.1.1'
    // implementation 'com.android.support:design:27.1.1'

    // Firebase Core
    implementation 'com.google.firebase:firebase-core:16.0.3'
    // Firebase Authentication
    implementation 'com.google.firebase:firebase-auth:16.0.3'
    // Ads
    implementation 'com.google.firebase:firebase-ads:15.0.1'
    // Analytics
    implementation 'com.google.firebase:firebase-analytics:16.0.3'
    // App Indexing
    implementation 'com.google.firebase:firebase-appindexing:16.0.1'
    // Cloud Firestore
    implementation 'com.google.firebase:firebase-firestore:17.1.0'
    // Cloud Functions
    implementation 'com.google.firebase:firebase-functions:16.1.0'
    // Cloud Messaging
    implementation 'com.google.firebase:firebase-messaging:17.3.2'
    // Cloud Storage
    implementation 'com.google.firebase:firebase-storage:16.0.2'
    // Crash Reporting
    implementation 'com.google.firebase:firebase-crash:16.2.0'
    // Crashlytics
    implementation 'com.crashlytics.sdk.android:crashlytics:2.9.5'
    // Dynamic Links
    implementation 'com.google.firebase:firebase-dynamic-links:16.1.1'
    // Invites
    implementation 'com.google.firebase:firebase-invites:16.0.3'
    // In-App Messaging
    implementation 'com.google.firebase:firebase-inappmessaging:17.0.1'
    // In-App Messaging Display
    implementation 'com.google.firebase:firebase-inappmessaging-display:17.0.1'
    // ML Kit: Model Interpreter
    implementation 'com.google.firebase:firebase-ml-model-interpreter:16.2.0'
    // ML Kit: Vision
    implementation 'com.google.firebase:firebase-ml-vision:17.0.0'
    // ML Kit: Image Labeling
    implementation 'com.google.firebase:firebase-ml-vision-image-label-model:15.0.0'
    // Performance Monitoring
    implementation 'com.google.firebase:firebase-perf:16.1.0'
    // Realtime Database
    implementation 'com.google.firebase:firebase-database:16.0.2'
    // Remote Config
    implementation 'com.google.firebase:firebase-config:16.0.0'
    // Google Sign In SDK (only required for Google Sign In)
    implementation 'com.google.android.gms:play-services-auth:16.0.0'
    // Firebase UI
    implementation 'com.firebaseui:firebase-ui-auth:4.1.0'

    // Facebook Android SDK (only required for Facebook Login)
    // Used in FacebookLoginActivity.
    implementation 'com.facebook.android:facebook-login:4.35.0'
    // implementation 'com.android.support:customtabs:27.1.1'

    // Twitter Android SDK (only required for Twitter Login)
    implementation 'com.twitter.sdk.android:twitter-core:3.3.0'
    implementation 'com.twitter.sdk.android:twitter:3.3.0'
}

apply plugin: 'com.google.gms.google-services'

提前谢谢你。

Answer 1

尝试将实现的版本从

implementation 'com.google.firebase:firebase-auth:16.0.3'

至

implementation 'com.google.firebase:firebase-auth:16.0.4'

Answer 2

在Android Studio中，进入Tools --> Firebase --> Assistant窗口，遵循firebase身份验证指南。

或者遵循此处的指导原则：

Google Firebase Authentication Steps

Answer 3

在你的项目中添加gradle

  buildscript {

repositories {
    google() // Google's Maven repository
    mavenCentral()
    jcenter()
}
dependencies {

    classpath 'com.google.gms:google-services:4.0.1' // google-services plugin


    // NOTE: Do not place your application dependencies here; they belong
    // in the individual module build.gradle files
    }
}


allprojects {
    repositories {
        google()
        jcenter()
    }
}

在你的Build.Gradle (App Module)项目App gradle中

implementation 'com.google.firebase:firebase-auth:16.0.3'
implementation 'com.google.firebase:firebase-core:16.0.3'

// ADD THIS AT THE BOTTOM
apply plugin: 'com.google.gms.google-services'