异常信息记录：

 Error:Failed to resolve: com.android.support:support-annotations:26.0.2
<a href="install.m2.repo">Install Repository and sync project</a><br><a href="openFile:D:/AndroidStudioProjects/Qsb2/appild.gradle">Open File</a><br><a href="open.dependency.in.project.structure">Show in Project Structure dialog</a> 

 

 Error:Failed to resolve: com.android.support:support-annotations:26.0.2
<a href="install.m2.repo">Install Repository and sync project</a><br>

?
<a href="openFile:D:/AndroidStudioProjects/Qsb2/appild.gradle">Open File</a><br>

?
<a href="open.dependency.in.project.structure">Show in Project Structure dialog</a> 

?

?

?

解决方法：

在项目的build.gradle里面最上层填写这样一句话：：：：

configurations.all {
    resolutionStrategy.force ‘com.android.support:support-annotations:23.1.0‘
}