Select subset of characters in many lines (column selection) in Eclipse/Android Studio

I use android studio. You can switch between selection mode by:
alt-shift-insert, or Edit -> Column selection mode.

source.

Without any command you can get selection mode by using mouse drag with press Alt in Android Studio,

Mouse: Alt+MouseDrag

Now Alt+Left_Mouse works in Android Studio.

Android Studio column selection on the Mac Book you can use this Shortcut Mac :

Cmd + Shift + 8

source here

To enter column selection mode, press alt-shift-insert.

To get the caret to occupy multiple lines, simply hold Shift and press the up or down arrow key. Then you can hold Shift and press the right or left key to select text horizontally like you usually would.

To exit column selection mode, press Esc.