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Android app with python? Search for Kivy - a cross platform python framework.
C++ This is the most appropriate and robust programming language when it comes to building mobile apps for Android and Windows- and, mainly for low-level programming, it's still the go-to language on platforms for mobile app developers. As a powerful programming language, C++ allows mobile apps to be developed for practically every purpose on every platform that exists. It might not be super chic or trendy, but it dominated the programming world even before the smartphone revolution. To get more: https://dzone.com/articles/top-6-programming-languages-for-mobile-app-develop