We need to talk to understand better your requirements.
I'm Java developer for 9 years, specifically working with Android since 2010. Before, I worked for 1 year in a research project developing apps in LWUIT (Java DTV) and NCL-Lua.
My Android projects already had over 3.5 million downloads in Google Play Store. These applications were developed for clients such as: OI, Samsung, TIM, Claro, Vivo, NET, Cielo, Positivo, Alcatel, CCE, among others.