Android dependency 'com.android.support:appcompat-v7' has different version for the compile (26.1.0) and runtime (27.1.1) clas..

Error:Execution failed for task ':app:preDebugBuild'.

Android dependency 'com.android.support:appcompat-v7' has different version for the compile (26.1.0) and runtime (27.1.1) classpath. You should manually set the same version via DependencyResolution

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解决

方法一： 在app的build.gradle中的dependencies里添加：

configurations.all {
    resolutionStrategy.force 'com.android.support:support-annotations:26.1.0'
}

方法二： 将app的build.gradle中的dependencies里的

    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'

换成之前不报错的版本，例如我之前不报错的版本为

    androidTestImplementation 'com.android.support.test:runner:1.0.1'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'

同步一下就可以了