Demo for a Voip project.
Uses Clean architecture with MVVM as a presantion pattern.
All UI is in fragments: CallFragment and UserListFragment. For every fragment there is a view model. Calling business logic is incapsulated in CallInteractor. It uses mVoipGateway that wraps work with actual Voip provider (which is curently Tokbox https://tokbox.com/). CallInteractor also uses MicrophoneGateway to turn microphone on and off.
Getting users from database is done via UserListInteractor which also sorts users by online status. UsersLocalRepository incapsulates work with UsersDao which currently generates users that are randomly online or offline. When call button is clicked, UserListViewModel selects randomly an online user and opens CallFragment, in which the call happens.