将Firebase连接到Android Studio

Question

很抱歉，是否曾经有人问过这个问题，但是我试图以先前的答案为基础。

给出错误Failed to resolve: firebase-auth-15.0.0

一般的解决方案似乎是删除实现中的数字：

dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
implementation 'com.google.firebase:firebase-auth:16.0.5'
implementation 'com.google.firebase:firebase-database:16.0.5'
implementation 'com.google.firebase:firebase-storage:16.0.5'
implementation 'com.google.firebase:firebase-auth:16.0.5'
}

更改

implementation 'com.google.firebase:firebase-auth:16.0.1:15.0.1'

到

implementation 'com.google.firebase:firebase-auth:16.0.5'

这解决了同步问题，并允许Gradle build finished

但是在Firebase菜单（2）中没有说明已成功添加：

为什么？这样工作还好吗？

---

整个build.gradle

---

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

android {
compileSdkVersion 28
defaultConfig {
    applicationId "com.example.cal.thou"
    minSdkVersion 19
    targetSdkVersion 28
    versionCode 1
    versionName "1.0"

 testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
  }
 }

dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
implementation 'com.google.firebase:firebase-auth:16.0.5'
implementation 'com.google.firebase:firebase-database:16.0.5'
implementation 'com.google.firebase:firebase-storage:16.0.5'
implementation 'com.google.firebase:firebase-auth:16.0.5'
implementation 'com.google.firebase:firebase-core:16.0.5'
}