I am very new in programming Android, I do not even know how to work in java but this site has introduced me to this great world. I tell you.
I have a phone and a tablet the first one with android 7.1.1 and the last one with 4.4 … in the first the WebView component works perfectly but the last one does not. In the latter you only see a gray strip at the top of the screen.
Please, try to fix this problem.
It would be nice if you post your blocks or/and screenshot.