This app display a list of cities and your current distance to the city. When selecting a city you can see the city boundary on a map.
Download APK here: https://github.com/acarlsen/cityBoundaries/releases
If building the app yourself you need to put your Google Maps API key in local.properties file:
MAPS_API_KEY=api_key
Build debug APK:
./gradlew assembleDebug