I have a team of experienced android developers. Our team of professional developers can build any app. Can you tell us more about the app? I am pretty sure you will like our work and have this work pave a way for our long term professional friendship :)
I can make you the perfect file manager app like what you want with smooth and flexible. and if you give me design i can make you exact same as design.
I've worked on Android mobile application development projects before.
I assure you, I can deliver your requirement, for building a file manager.
Thank you