Why all androidx related library can't find reference in Android Studio?

[鄭乃洪]

Hello Team,

I follow the standard building process to get a successful build.
Then in order to write code in Android Studio I run idegen.sh and get android.iml and android.ipr file.

Then open android stduio with android.ipr I found only androidx library shows erreor "can't find the symbol".

Does anyone have clue about this?

Thanks,

Mark Cheng