TIMOB-19691 we have added support for Split View and Slide Over.
When the app Slides Over or changes to/from Split View, the Ti.App:resumed and in one occasion Ti.App:resume events are fired. We have not documented this, but I'm filing this in TIMOB because we might want to find out if there are ways/reasons we should split this out into specific events for Split View and Slide Over.
For a list of events in which resume and resumed are fired see the 5.2.0 Sample Source:
The resumed event actually covers pretty much all scenarios, except for one AFAIK. When your app is on the left side of a Split View and moves back to fullscreen because the other app closes or switches to Slide Over you will not get notified. It would be great if we can somehow detect this as well.