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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.

Add a ViewModel Open build.gradle.kts (Module :app) , scroll to the dependencies block and add the following dependency for ViewModel . This dependency is used for adding the lifecycle aware viewmodel to your compose app.

Jetpack Compose is Android's recommended modern toolkit for building native UI. It simplifies and accelerates UI development on Android. Quickly bring your app to life with less code, powerful tools, and intuitive Kotlin APIs.

viewModel() returns an existing ViewModel or creates a new one in the given scope. The ViewModel is retained as long as the scope is alive. For example, if the composable is used in an activity, viewModel() returns the same instance until the activity is finished or the process is killed.

If you already have an Android Studio project open , select File > New > New Project from the menu bar. In the Select a Project Template window, select Empty Compose Activity and click Next. In the Configure your project window, do the following: Set the Name, Package name, and Save location as you normally would.

In compose, we have a similar function called BackHandler. It, basically, is a composable which takes a lambda which is called when the back press is handled. The BackHandler composable uses the OnBackPressedCallback internally.

In compose, we have a similar function called BackHandler. It, basically, is a composable which takes a lambda which is called when the back press is handled. The BackHandler composable uses the OnBackPressedCallback internally.

The Compose framework can intelligently recompose only the components that changed. Every time the button is clicked, the caller updates the value of clicks . Compose calls the lambda with the Text function again to show the new value; this process is called recomposition.