Teach a C# dev to program android apps with java

My company recently took on a project where it's necessary to create native apps for an existing website we made. As a C#/ASP.NET developer Java is not very far from my skillset, but I know very little about the ways of android, aside from a bit of tinkering a few years ago. The app is going to be multi-language, multi-tenant (rights to the app can be bought by people who seek to publish the app as their own with individual styles, texts etc. provided by an API) and is supposed to launch at the end of this year. I need help learning a little more than the basics of android - managing a local cache from our data API, loading styles/UI content dynamically, ... I understand the concept of these things but don't know how to implement them in android. Help me for a total of about 10 hours remotely via discord, skype or microsoft teams over the course of 1-2 weeks. It's highly likely that I'm going to need help later on, for smaller periods of time. Before signing any contract, a 5-10 minute introduction will be necessary to make sure you understand your tasks and also to assert voice quality. Requirements: Fluent English, preferrably no strong accent.