| Arrays | 
| Button | Main entry point to the Button SDK. | 
| ButtonDropin | This is the only UI class that you will have to drop into your layout XML to display a Button. | 
| ButtonDropin.Listener | 
| CompatHelpers | |
| CompatHelpers.RippleBackground | 
| LatLngPair | Class representing a coordinate (latitude and longitude) for use in PlacementContext
 that can be used to specify to/from locations for a ButtonDropin, see prepareForDisplayWithContext(PlacementContext)
 and willDisplayPromotion(String, PlacementContext, ButtonDropin.Listener)
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| LocationProvider | Convenience class that will check all available (taking available permissions into account) for the newest location. | 
| PlacementContext | Convenience class on top of JSONObject. | 
| Receiver<T> |