I have a questions

Does anyone know where I can find the open street maps api for android?
I’m looking for one which can be integrated into another app and fully customized.

What are you actually trying to do? There are a number of different OSM APIs that are used for different things, so depending on what you want to do, the answer may be different. Also, for most of the things that you might want to do on a phone you probably don’t need access to an OSM API at all.