Imaplementation of Login design with different architecture like MVP, MVVM, VIPE, VIPER
I encourage you to read more in details about different architecture used in android.
MVP https://github.com/MindorksOpenSource/android-mvp-architecture
MVVM https://github.com/MindorksOpenSource/android-mvvm-architecture
VIPE & VIPER ( View(views) Interactor Presenter Entity(model) Router)
https://cheesecakelabs.com/blog/using-viper-architecture-android/