920 reference: keyboard shortcuts

The lessons use these keys in Android Studio. Click in the code first. Then the keys go to the code.

What it does

Windows and Ubuntu

Mac

Undo

Ctrl+Z

⌘Z

Redo

Ctrl+Shift+Z

⌘⇧Z

Cut

Ctrl+X

⌘X

Copy

Ctrl+C

⌘C

Paste

Ctrl+V

⌘V

Delete the line

Ctrl+Y

⌘Delete

Duplicate the line

Ctrl+D

⌘D

Comment out the line

Ctrl+/

⌘/

Show completions

Ctrl+Space

Control+Space

  • Delete the line, on Windows: the first time you press Ctrl+Y, Android Studio asks whether it should Redo or Delete Line. Click Delete Line.

  • Comment out the line puts // in front of it. Press the same keys again to take it off.

  • Show completions lists the words that could finish what you typed. When only one fits, Android Studio types it for you.