List of commonly used shortcut keys in Android Studio
Alt+Enter : Import package, automatically correct
Ctrl+N : Find class
Ctrl+Shift+N : Find files
Ctrl+Alt+L : Format code
Ctrl+Alt+O : Optimize imported classes and packages
Alt+Insert : Generate code
Ctrl+E or Alt+Shift+C : Recently changed code
Ctrl+R : Replace text
Ctrl+F : Find text
Ctrl+space : code prompt
Ctrl+Alt+Space : class name or interface name prompt
Ctrl+P : method parameter prompt
Ctrl+Shift+F : global search
Ctrl+Shift+R : global replacement
Ctrl+F : Search in this category
Ctrl+R : Replace this class