Update Tutorial1.md

samples/tutorial/Tutorial1.md

@@ -91,10 +91,10 @@ data class WelcomeScreen(
 )
 ```
 
-Then we need to create a `ViewFactory` that knows how to create an Android `View` to draw the actual screen. The easiest way to create a `ViewFactory` is to create a layout runner. A layout runner is a class that has a reference to the view and knows how to update the view given an instance of a screen. In a typical app, every screen will have a layout runner. Layout runners can also work with AndroidX `ViewBinding`s, which we'll use to define the `WelcomeLayoutRunner`. We have a pre-built `WelcomeViewBinding` that you can use. This binding will be autogenerated from layout files in `tutorials-views` when you first build the app. If Android Studio does not automatically find the file, you can manually import it `import workflow.tutorial.views.databinding.WelcomeViewBinding
-`. However if you would like to create and lay out the view yourself instead, feel free to do so!
+Then we need to create a `ViewFactory` that knows how to create an Android `View` to draw the actual screen. The easiest way to create a `ViewFactory` is to create a layout runner. A layout runner is a class that has a reference to the view and knows how to update the view given an instance of a screen. In a typical app, every screen will have a layout runner. Layout runners can also work with AndroidX `ViewBinding`s, which we'll use to define the `WelcomeLayoutRunner`. We have a pre-built `WelcomeViewBinding` that you can use. This binding will be autogenerated from layout files in `tutorials-views` when you first build the app. If Android Studio does not automatically find the file, you can manually import it `import workflow.tutorial.views.databinding.WelcomeViewBinding`. However if you would like to create and lay out the view yourself instead, feel free to do so!
 
 ```kotlin
+@OptIn(WorkflowUiExperimentalApi::class)
 class WelcomeLayoutRunner(
   private val welcomeBinding: WelcomeViewBinding
 ) : LayoutRunner<WelcomeScreen> {
@@ -168,6 +168,10 @@ dependencies {
 We'll update the `TutorialActivity` to set its content using a `ViewRegistry` that points to our `LayoutRunner`'s `ViewFactory`:
 
 ```kotlin
+@file:OptIn(WorkflowUiExperimentalApi::class)
+package workflow.tutorial
+// ...
+
 // This doesn't look like much right now, but we'll add more layout runners shortly.
 private val viewRegistry = ViewRegistry(WelcomeLayoutRunner)
 
@@ -189,9 +193,9 @@ class TutorialActivity : AppCompatActivity() {
 class TutorialViewModel(savedState: SavedStateHandle) : ViewModel() {
   val renderings: StateFlow<WelcomeScreen> by lazy {
     renderWorkflowIn(
-        workflow = WelcomeWorkflow,
-        scope = viewModelScope,
-        savedStateHandle = savedState
+      workflow = WelcomeWorkflow,
+      scope = viewModelScope,
+      savedStateHandle = savedState
     )
   }
 }