androidx.lifecycle:lifecycle-viewmodel
Official Description: Android Lifecycle ViewModel
CommonsWare’s Notes
As the name suggests, this artifact contains ViewModel, the Jetpack solution
for retaining data across configuration changes. Despite its name, ViewModel
is not strictly tied to MVVM or other GUI architectures that use
“viewmodel” as a term.
This artifact also contains ViewModelProvider and ViewModelStore, ways for you
to obtain ViewModel instances. It also contains AndroidViewModel,
a ViewModel that has a Context that you can use for all those places
where you need a Context.
As with many facet of the Jetpack, ViewModel was introduced before the
migration to androidx Java packages. If you see references to
android.arch.lifecycle.ViewModel, the AndroidX equivalent has a near-identical
API and fills the same role.
Documentation
Knowledge
- Passing Data Between Fragments on Android Using ViewModel (2019-07-30)
- Using ViewModel with RoomDatabase (2019-03-15)
Samples
- Elements of Jetpack Basic ViewModel Example (Java)
- Elements of Jetpack Basic ViewModel Example (Kotlin)
Versions
- Latest Stable: 2.2.0
- Latest Release Candidate: 2.2.0-rc03
- Latest Beta: 2.2.0-beta01
- Latest Alpha: 2.3.0-alpha03