Android MVVM Architecture
MVVM Architecture with Jetpack: ViewModel, LiveData, Data Binding, Separation of Concerns, Unidirectional Data Flow
1What is a ViewModel in Android?
What is a ViewModel in Android?
Answer
A ViewModel is a Jetpack component that stores and manages UI-related data in a lifecycle-aware way. It survives configuration changes (screen rotation) and allows separating business logic from UI.
2How do you create a ViewModel instance in an Activity?
How do you create a ViewModel instance in an Activity?
Answer
Use ViewModelProvider to create or retrieve a ViewModel instance. ViewModelProvider(this).get(MyViewModel.class) ensures you get the same instance even after screen rotation.
3Why should you never pass an Activity or View Context into a ViewModel?
Why should you never pass an Activity or View Context into a ViewModel?
Answer
The ViewModel survives configuration changes and lives longer than Activities. Keeping an Activity Context reference would cause a memory leak. Use AndroidViewModel with Application Context if needed.
What is LiveData?
What is the difference between LiveData and MutableLiveData?
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