You can easily run into mysterious errors with Android Studio. Here is one.
Suddenly all references related to R.layout or R.id stopped to work and build failed with a message like this:
Compilation error. See log for more details Unresolved reference: activity_main Unresolved reference: url_edittext Unresolved reference: update_button
The code looked like this:
override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main)
I tried clean, builds, rebuilds. Nothing helped. The problem was caused by simple import which accidentally occurred in Activity file:
import android.R
After removing this line the whole project was working again and even code hinting was correct.