The default IntelliJ / Android Studio \"Redo\" action shortcut is CTRL+Shift+Z and this is a common problem for Windows users.
A bigger
Open Settings
(press CTRL+ALT+S)
Click Keymap
on the left list.
There is a combobox that contains keymaps. Select one of them (default means IntelliJ of course. We can't change any of pre-defined keymap however we can copy, edit and then use the edited one. So) we should copy "default" to change only redo mapping.
Give a new name to your copied keymap.
Right click on:
Main Menu -> Edit -> Redo
to click "Add Keyboard Shortcut"
Press CTRL+Y
Click OK
Click "Remove" to "the shortcut is already assigned to other actions. Do you want to remove other assignments?"
If you want to use any "remove line" shortcut also, then go to delete line shortcut and give to it any other shortcut (like 5th step)
Click OK to close settings window.