Wheellog.Android VS architecture-samples

WheelLog is infinitely better than EUC World and an observant person will notice a lot of people simp for the EW dev's grift here. My only complaint is it doesn't export directly to GPX but it does export to CSV, which can be transformed into a compliant GPX format using some Python magic.

WheelLog (version 82): A dashboard for KingSong, Gotway, Inmotion, Ninebot Electric Unicycles

Here's an example project on GitHub that demonstrates how to use a ViewModel in practice: https://github.com/android/architecture-samples/tree/master/BasicSample

For me this one is the best: Architecture samples it's easy to understand and covers lots of concepts.

Since I never had a mentor or any courses I decided to follow anyone in their development approaches and my choice was google team. There are repo which is supported and update for years, it changes and might slightly differ in branches. But it could answer your questions.

For merging multiple data-sources, like network and database, I can use Repository backed with NetworkDataSources and DbDataSources. For data manipulation, Kotlin's collection has many useful functions (map, reduce, groupBy, count, etc.). If I want to ensure a data can only be emitted once, a simple modification to LiveData is enough (SingleLiveData

Take a look on Android blueprints https://github.com/android/architecture-samples