Cannot find R.layout.activity_main

Question

I was trying to work out with multiple layout using some online tutorials. The thing is my program was building and compiling correctly as long as there was only one XML fil

Answer 1

First Doing This --> Select Build > Clean Project from the Android Studio toolbar, wait a few moments, and then build your project by selecting Build > Rebuild Project.

if Problem Not solved then doing This --> File > Invalidate Caches / Restart > Invalidate and Restart from Android Studio’s toolbar.