ERROR实现'com.android.support:appcompat-v7:27.1.1'

Question

我不知道为什么

  

“implementation'com.android.support:appcompat-v7:27.1.1'”

行是错误？

android {
compileSdkVersion 27
defaultConfig {
    applicationId "phpmysql.example.com.e_seefy"
    minSdkVersion 19
    targetSdkVersion 27
    versionCode 1
    versionName "1.0"
    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}
}

在这一行中，我只需添加

  

“implementation fileTree（dir：'libs'，include：['* .jar']）”

用于将我的应用程序连接到firebase。我还在此代码中包含了最后一行。

dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:27.1.1'
implementation 'com.android.support.constraint:constraint-layout:1.0.2'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.1'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
implementation 'com.google.firebase:firebase-core:16.0.0'
}

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