mvvm cross native android flyout page gruop item menu color change

Question

i am new in mvvm cross native android C# so i need menu item color change i had to multiple view model then any view model i will call some method menu item color change how can i do

Jithu Thomas · Answer

In the MVVM (Model-View-ViewModel) architecture for Xamarin.Android using MvvmCross, you can achieve the menu item color change by having a shared ViewModel or by using a messaging system to communicate between different ViewModels. Below are the steps you can follow: Shared ViewModel: Create a Shared ViewModel: Create a ViewModel that will be shared among different ViewModels. public class SharedViewModel : MvxViewModel { private MvxColor _menuItemColor; public MvxColor MenuItemColor { get => _menuItemColor; set { SetProperty(ref _menuItemColor, value); RaisePropertyChanged(() => MenuItemColor); } } } Initialize the ViewModel: Initialize this ViewModel in the Setup.cs file or at the beginning of your application. protected override IMvxApplication CreateApp() { Mvx.IoCProvider.RegisterSingleton (() => new SharedViewModel()); // ... other setup code return new App(); } Use the Shared ViewModel in Other ViewModels: Inject the shared ViewModel into other ViewModels where you want to change the menu item color. public class YourViewModel : MvxViewModel { private readonly SharedViewModel _sharedViewModel; public YourViewModel(SharedViewModel sharedViewModel) { _sharedViewModel = sharedViewModel; } // Your ViewModel code } Change MenuItem Color: In any ViewModel, you can now change the menu item color by updating the MenuItemColor property of the shared ViewModel. _sharedViewModel.MenuItemColor = MvxColor.Parse("#FF0000"); // Set your desired color Messaging System (using MvxMessenger): Define a Message: Create a message class that holds the information you want to send. public class ChangeMenuItemColorMessage : MvxMessage { public MvxColor NewColor { get; } public ChangeMenuItemColorMessage(object sender, MvxColor newColor) : base(sender) { NewColor = newColor; } } In the ViewModel where you want to react to the color change, subscribe to the message. var messenger = Mvx.IoCProvider.Resolve (); messenger.Subscribe (OnMenuItemColorChanged); private void OnMenuItemColorChanged(ChangeMenuItemColorMessage message) { // Update your menu item color based on message.NewColor } The shared ViewModel approach may be more straightforward for simple scenarios, while the messaging system allows for more loose coupling between components.