无法解决Gradle中的support-v4 27.1.0依赖关系

Question

我正在尝试在Android 27上构建一个应用程序，并在我添加android com.android.support:support-v4:27.1.0和com.google.firebase：firebase-messaging：12.0.1依赖项时遇到问题。< / p>

My Project Gradle文件如下所示 -

buildscript {

    repositories {
        google()
        jcenter()
        maven {
            url "https://maven.google.com"
        }
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.1.0'
        classpath 'com.google.gms:google-services:3.2.0'

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

allprojects {
    repositories {
        google()
        jcenter()
        maven {
            url "https://maven.google.com"
        }
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

My App build.gradle文件如下所示 -

apply plugin: 'com.android.application'

android {
    compileSdkVersion 27
    buildToolsVersion '27.0.3'
    defaultConfig {
        applicationId "com.project.webinar"
        minSdkVersion 26
        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'
        }
    }
}

dependencies {
    //implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:27.1.0'
    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-messaging:12.0.1'
    implementation 'com.google.android.gms:play-services-base:12.0.1'
    implementation 'com.android.support:support-v13:27.1.0'
    implementation 'com.android.support:support-v4:27.1.0'
    implementation 'com.google.android.gms:play-services-places:12.0.1'
    implementation 'com.google.android.gms:play-services-location:12.0.1'
}

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

在Android Studio 3.1.0上构建时出现以下错误 -

有人可以帮助我如何获得支持-v4：27.1.0为我的应用程序工作？

Answer 1

您的gradle似乎已离线或您已启用代理