遵循连接到 Firebase 的步骤后，应用程序级别的 gradle 同步失败

Question

dependencies {
 implementation fileTree(dir: 'libs', include: ['*.jar'])
 implementation 'com.android.support:appcompat-v7:27.1.1'
 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-core:16.0.1'
}

导致错误：

implementation 'com.android.support:appcompat-v7:27.1.1'
same version specification (mixing versions can lead to runtime crashes)
says "All com.android.support libraries must use the exact same version specification (mixing versions can lead to runtime crashes). Found versions 27.1.1, 26.1.0. Examples include com.android.support:animated-vector-drawable:27.1.1 and com.android.support:support-media-compat:26.1.0"

Answer 1

你必须在依赖块之后添加这个

configurations.all {
   resolutionStrategy.eachDependency { DependencyResolveDetails details ->
     def requested = details.requested
     if (requested.group == 'com.android.support') {
        if (!requested.name.startsWith("multidex")) {
            details.useVersion '27.1.1'
        }
    }
}

它会消除这个错误！！