This works by scraping data from the Dexcom Share web API, so it requires an iOS device to be paired with the transmitter until Dexcom release an Android version of the Share uploader app or xDrip/nightwatch reverse engineers the new protocol for the G5 transmitters.

I might release this to the Play Store when it's a bit more polished, but in the meantime the source is on github: https://github.com/c99koder/DexcomShareDashclock