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Android Java
Learn how to build Android apps in Java with Views and XML — from the first Activity and its lifecycle through layouts, fragments, RecyclerView, ViewModels and LiveData, background threads, Room and Retrofit, navigation and Hilt, up to services, notifications, content providers and diagnosing a broken app.
Android
Module 1
4Activities & Lifecycle
Learn how to make an app open, stay alive and keep its state: declare the launcher Activity, hold resources only while the screen is visible, and survive rotation with onSaveInstanceState.