I have test it with the object "WMSLayer" and "ArcGISTiledMapServiceLayer" with no success to show it on a map. But I can't not see on the android api a base layer like "WMTSLayer". Simply doesn't exist.
Anyone knows if Arcgis for android supports WMTS and WMTS-C?
The ArcGIS Runtime SDK for Android doesn't have a WMTSLayer at the 10.2.3 release (as you've discovered) but we're working on this and aim to support WMTS layers at the next release of Android as well as Java SE.