Issue
First image is my Netbeans IDE. As you can see whenever I place the text cursor on a variable, that variable is highlighted everywhere else where it appears. I find this feature very helpful and want to enable it on Android Studio (second image).
Solution
Have you tried Identifier under caret
setting?
Probably some mismatch with the colors you have set for Foreground and Background
Check my screenshot and let me know how it goes
Answered By - Sahan Serasinghe