This sample should help get you started.
ArcGIS Runtime for Android Nearby Sample
https://github.com/Esri/arcgis-runtime-samples-android/tree/master/Nearby
About the sample
The purpose of this sample is to leverage your devices GPS position to zoom to your location on the map. When you click on the either of the buttons on the action bar, coffee denoting local coffee shops or pint glass denoting bars, the respective shops in your area are displayed on the map. Check device setting to make sure that location services are enabled for the app.
