Conflict with dependency 'com.android.support:support-annotations' in project ':app'

在Android Studio 创建新项目的时候，出现这个报错：

Error:Execution failed for task ':app:preDebugAndroidTestBuild'.
> Conflict with dependency 'com.android.support:support-annotations' in project ':app'. Resolved versions for app (26.1.0) and test app (27.1.1) differ. See https://d.android.com/r/tools/test-apk-dependency-conflicts.html for details.

可以用Build->Rebuild Project解决，但这个方法只是临时的，重新打开项目还是会报错

解决办法1

解决办法：在 build.gradle 添加

android {
    ...
}

configurations.all {
    resolutionStrategy.force 'com.android.support:support-annotations:27.1.1'
}

dependencies {
    ...
}

解决办法2

在app下的build.gradle文件中的dependences {}中添加如下代码：

androidTestCompile('com.android.support:support-annotations:26.1.0') {
    force = true
}