cyberakp.blogg.se - Kotlin app

This makes it easy to create objects that react to the state of a component. Lifecycle is a class that holds the information about the lifecycle state of a component (like an activity or a fragment) and allows other objects to observe this state.

Lifecycle: Most of the app components defined in the Android Framework have lifecycles attached to them.

Below are brief descriptions of each of these components and how they help in implementing an MVVM architecture. There are four major Architecture Components. Lets take a quick look at each of the AAC components and how they help in an MVVM Architecture. Now, AAC provides components that make implementing each of the MVVM layers easy. Changes to data are exposed via an observable interface so that other application components can observe and react accordingly.

The Model: The Model layer (also called the Data layer) represents the sources of data that are required to drive the applications business logic.

The ViewModel observes changes to data from relevant data sources in the Model layer and these changes get propagated to the View for display.

The ViewModel: The ViewModel represents the current state of a View and any update to the ViewModel is propagated to the View for display.

It does this by observing changes to its underlying ViewModel and displays those changes to the screen. Its sole purpose is to display UI items to the user of the application.

The View: The View is usually a dummy component.

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