I have had a windows-only desktop app for a long time now and a while ago I decided to expand to multiple platforms including Android but got busy doing a million other things that couldn't start the journey and while the project I currently work on would eventually have all those options too but it is at least a year away from being complete.

If you are familiar with .Net and C# you could use my code as an starting point. Since the code is very loosely coupled I don't think the migration is going to be that hard, these would be the steps:
- Change the target framework to .Net core (v 2.2 or better yet use the latest v 3.1)
- Swap all the views with Xamarin forms which are using pretty similar XAML syntax so that conversion should also be easier
- Add a new Balance and Price APIs to support LTC. This may be harder since it would require changing the wallet file and how addresses are stored to figure out which is which!