Build me whatsapp like app for android only. -- 2

I want an android app like Whatspp, but it doesn't requires all the features in Whatsapp. There is no client and server architecture, it is a application with static content stored in database. While im starting the application first time after installing i need actual dialogues which are takes place in original whatsapp actually,those mobile number, auto otp filling, restoring backup from backup files. (for those process we dont need any background process as in original whatsapp). After verifying the mobile otp,it have to enter into home page. There the interface should be like in original whatsapp. Lists of chats will be there. All the chat informations will be retrieved from backgroud db,(chat name, contact name, date time, group name, chat content). And those informations are static content and pre filled. there should be a interface for adding those inforamtions into database. For second time of opening the application there is no need for mobile number, otp verification, it should directly goes to chat list. If i click any chat name, it shoud shows the chat history as like in original whatsapp, but the only difference is those contents are static and pre-filled.