To tell you the truth, I'd personally suggest you use android app development services. They offer all answers for all your possible questions. This team is well-experienced and one of my friends who dedicated his whole personal life for creating apps for users suggested I use this service. Sometimes, I do wonder how many people are working there, they are 24/7 available for questions and they have their own strategy of developing the app. When I was using this service, I felt really cared for and they offered all necessary graphics and planning for the app.