IssueTracker

Currently it's a grid, which doesn't look very good in my app's theme.

I tried putting the MapView in a FrameLayout, putting an opaque layer on top of the MapView, and then removing it in an OnMapLoadedCallback, but that callback doesn't seem to be supported by liteMode.

So my feature request is: either
- enable OnMapLoadedCallback for liteMode mapview
- allow customization of the "loading" drawable (ideally through MapView.setBackground slash android:background)