FindViewById() not finding View

Question

Just added a new button to my already-working-fine layout, but the findViewById function seems to be angry with something I don\'t get to understand.

Here\'s a bit o

Answer 1

Make sure to go through these processes.

1: Make sure you imported your project R file.

import packagename.R

2: Clean your project

3: If the above two solutions doesn't work, do invalidate your cache and restart