A keyboard shortcut to comment/uncomment the select text in Android Studio

To comment/uncomment one line, use: Ctrl + /.

To comment/uncomment a block, use: Ctrl + Shift + /.

MAC QWERTY (US- keyboard layout) without numpad:

Line comment : ⌘ + /
Block comment: ⌘ + ⌥ + /

MAC QWERTZ (e.g. German keyboard layout):

Android Studio Version ≥ 3.2:
Line comment : ⌘ + Numpad /
Block comment: ⌘ + ⌥ + Numpad /

thx @Manuel

Android Studio Version ≤ 3.0:
Line comment : ⌘ + -
Block comment: ⌘ + Shift + -

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