Android Studio 丢失了引用

Question

Today when I open my project the android studio doesn't find the references of things, yesterday the app was running correcly when turn off the Windows had updated and when started Android Studio update too, I saw something about gradle but put it in local/offline doesn't works

Printscreen with the error

Answer 1

Most likely the problem is with Android Studio caches. Try "File" -> "Invalidate Caches / Restart...", and select "Invalidate and Restart".

Answer 2

I had the same problem with my RecyclerViewAdapter and it resolved the problem by deleting "R.android.r". I am not sure if this is a specific situation for me but see if you can find it within your import section.

Answer 3

尝试清理项目：Build -> Clean Project

Answer 4

Try to remove or rename the Android SDK folder and restart the Android Studio. It will be recreated SDK folder. And you can use it normally.