How to apply TAB on several lines in Android Studio

Sure. Press (and keep pressed) the alt-option command on your Mac, then click with the mouse/touchpad and move upwards/downwards. The effect is the following:

(source)

Select several lines, then press tab to indent them or press Shift + tab to unindent them. This works at least on OS X V10.11.6 with Android Studio V2.1.2. Hope this helps you or people who read this question. Thanks.

To tab shift multiple lines in android studio editor:

Select lines ( SHIFT-DOWN/UP ) and press TAB key 

Shift TAB does the same backwards.