This sample demonstrates how to consume an Esri .geodatabase file (aka. mobile geodatabase) by using a FeatureLayer and a GeodatabaseFeatureTable.
The mobile geodatabase (.geodatabase file) will be downloaded from an ArcGIS Online portal automatically from the Url: https://www.arcgis.com/home/item.html?id=2b0f9e17105847809dfeb04e3cad69e0.