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ViewModel lets your app follow the architecture principle of driving the UI from the model. ViewModel stores the app-related data that isn't destroyed when the activity is destroyed and recreated by the Android framework. Unlike the activity instance, ViewModel objects are not destroyed.

2 ways (by viewModels and viewModel() composable function) to create view model in your Jetpack compose app by viewModels. viewModel() composable. by ViewModels (custom constructor) viewModel() composable (custom constructor) HiltViewModel() - DI Framework. Conclusion.

ViewModelScope is a Kotlin extension provided by the Android Architecture Components library. It allows developers to easily manage the lifecycle of coroutines launched within the scope of a ViewModel.

In order to use ViewModel within your composables you also need the lifecycle-viewmodel-compose dependency, which brings the viewModel {} composable function. Next, create a ViewModel class that will hold our screen's business logic. For this example we will build a basic calculator app.

You can scope a ViewModel to an Activity, Fragment, or destination of a Navigation graph. The viewModels() extension functions provided by the Activity, Fragment and Navigation libraries, and the viewModel() function in Compose allows you to get an instance of the ViewModel scoped to the closest ViewModelStoreOwner .

ViewModel classes are used to store the data even the configuration changes like rotating screen. ViewModel is one of the most critical class of the Android Jetpack Architecture Component that support data for UI components. Its purpose is to hold and manage the UI-related data.

The purpose of ViewModel is to encapsulate the data for a UI controller to let the data survive configuration changes. For information about how to load, persist, and manage data across configuration changes, see Saved UI States.

ViewModel lets your app follow the architecture principle of driving the UI from the model. ViewModel stores the app-related data that isn't destroyed when the activity is destroyed and recreated by the Android framework. Unlike the activity instance, ViewModel objects are not destroyed.

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