Android game development : how to generate a map dynamically?

I'm thinking about starting to programming an Android game, and my main problem is that i don't know how to generate a random map and/or a ground like "Boom Beach" and all that stuff which foolow a logic (pattern ?).

I often read articles about this but it's always the theory (like heightmap), and i don't understand how to implement this (heightmap or not) in Android code.

I would appreciate some examples and references guys.

Thanks a lot.

[Note : I'm a beginner of game development but not in programming, i'm a web developer and also know some Java and Android programming]