Find and replace Android studio

I think the shortcut that you're looking for is:

Ctrl+Shift+R on Windows and Linux/Ubuntu

Control+Shift+R on macOS (IntelliJ IDEA Classic keymap)

Cmd+Shift+R on macOS (macOS keymap)

ref: source

In Android studio, Edit -- > Find --> Replace in path, this will check in whole project including comments and code.

On Windows:

Find : Ctrl+F

Find And Replace In Single Class: Ctrl+R

Find And Replace In Whole Project: Ctrl+Shift+R

on OS X ,it is similar, just replace Ctrl with Command