Android Viewmodel Example

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Android Architecture Components provides the ViewModel helper class for the UI controller that is responsible for preparing data for the UI ViewModel objects are automatically retained during configuration changes we will see that in the below example An example state holder is ViewModel. ViewModel. The ViewModel component holds and exposes the state the UI consumes. The UI state is application data transformed by ViewModel. ViewModel lets your app follow the architecture principle.

Android Viewmodel ExampleWhile this is a very simplified example, the point is that the only thing which this particular ViewModel exposes publicly (other than the handleEvent function), is a simple Note object: data class Note(val creationDate:String, val contents:String, val imageUrl: String, val creator: User?) A very simple example Step 1 Create a ViewModel class Note To create a ViewModel you ll first need to add the correct lifecycle dependency Step 2 Associate the UI Controller and ViewModel Your UI controller aka Activity or Fragment needs to know about your Step 3 Use the ViewModel in your