出现问题：
Error:(
28,
13) Failed to resolve:
com.android.support:appcompat-v7:
27.0.1
Install Repository
and sync project
Show
in File
Show
in Project Structure dialo
解决方法：
在Project级别build.gradle的allprojects内添加maven{url “https://maven.google.com“},然后rebuild project项目即可
allprojects {
repositories {
jcenter()
maven{
url
"https://maven.google.com"
}
}
}
