I guess have you heard about WhatsApp, Line, IMO etc. It comes under the smart messaging app. You can also create app like these for your final year android project. You can add feature to your app according to your requirement.
I just want to build something which make me happy. You can gave the feature to your app.
Single Chatting
Group Chatting
You Can Share any type of file under 100 MB
Instant chatting. Ring notification for someone when he will call you.
Voice chatting
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useful tutorial keep it up...
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