Android Studio找不到libs目录 https://blog.csdn.net/xcx0215/article/details/72624983

Failed to resolve: com.github.PhilJay:MPAndroidChart

https://blog.csdn.net/qq_30711091/article/details/80937202

The given artifact contains a string literal with a package reference ‘android.support.v4.content‘

 https://blog.csdn.net/MRYZJ/article/details/98055873