Gradle 同步在我的安卓工作室中安装 firebasae 时失败

Question

apply plugin: 'com.android.application'
android {
compileSdkVersion 28
defaultConfig {
applicationId "com.example.aakash.rozgari"
minSdkVersion 15
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-alpha3'
implementation 'com.android.support.constraint:constraint-layout:1.1.2'
compile 'com.google.firebase:firebase-database:16.0.1'
compile 'com.google.firebase:firebase-crash:16.0.1'
compile 'com.google.firebase:firebase-auth:16.0.2'
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'
}
apply plugin: 'com.google.gms.google-services'

在我的安卓工作室中安装 Firebase 时，Gradle 同步失败，请帮我解决这个问题。我也在实现"com.android.support：appcompat-v7：28.0.0-alpha3"中获得红色下划线

Answer 1

更新您的项目build.gradle以使用最新版本的插件：

buildscript {
repositories {
google()
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:3.1.3'
classpath 'com.google.gms:google-services:4.0.1' // <== CHANGED
}
}
allprojects {
repositories {
google()
jcenter()
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}