Ctrl + Alt + O - To remove the unused import statements

Shift + Alt + Mouse Click - To add multi cursors

Ctrl + F4 - To close the current file

Ctrl + Shift + F - To find something in the whole application

Shift + F6 - To change the value at all places

Shift + F10 - To build and run the activity

Ctrl + F10 - To apply the changes and restart the activity

Ctrl + Shift + Backspace - To go to last edit location

Alt + Right-Arrow , Alt + Left-Arrow - To navigate between open files

Ctrl + / - To comment/uncomment with line comment

Ctrl + Shift + / - To comment/uncomment with block comment

Ctrl + Alt + L - To reformat the code