How to select subset of characters in many lines (column selection) in Eclipse/Android Studio?
Ideally without plugins. Shift+Alt+A seems not to be working for me either.
Lots of previous answers, but this might be easier or more straightforward as compared to memorizing key shortcuts.
Just Right-click while the cursor is inside a file/class, then select/deselect 'column selection mode' from the list of options that appears (usually the fifth option on the list)