having main activity with two behaivior(sender,receiver) xamarin android

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Mobile

Android

C#5.0

Xamarin

hi all friends ,
i am developing xamarin android app that use for managing payments between two device with NFC
Know i have a main activity that want to use as sender/receiver
why i am seprating them because user interface of sender and receiver should be differ
in sender i have a texbox to input price and a button to send but in receiver i have a list view shows credit cards to select and when a price receive from NFC show a dialog to pay and return a accept message to sender
know how can i manage this in one app ?
can i have something like app.config in .net to change my main activity ui and behavior with some setting from that config ? or any other way? is my idea fail in this solution ? can manage it easier?
excuse me because i am new in xamarin and android development and architecture ...