AppCompatActivity VieModelStoreOwner

Question

I'm a bit lost, I am trying to implement the ViewModelProvider in Xamarin.Android but it seems like IViewModelStoreOwner is not implemented by AppCompatActivity

C# Code

 var androidViewModelFactory = ViewModelProvider.AndroidViewModelFactory.GetInstance(Application);


                var viewmodelprovider =
                    new ViewModelProvider(this, androidViewModelFactory); **// this=AppCompatActivity does not impliment IViewModelStoreOwner** 

                var vm = (CameraXViewModel)viewmodelprovider.Get(cameraXViewModel.Class);

Java Code

 new ViewModelProvider(this,androidViewModelFactory ) /**/ this =AppCompatActivity javacode implimenents ViewModelStoreOwner Interface**   
        .get(CameraXViewModel.class)
        .getProcessCameraProvider()
        .observe(
            this,
            provider -> {
              cameraProvider = provider;
              if (allPermissionsGranted()) {
                bindAllCameraUseCases();
              }
            });

Therefore I cannot implement ViewModelProvider in Xamarin.Android

What am I missing.

Thanks in advace

Answer 1

Hello,

Welcome to Microsoft Q&A!

In Xamarin Android, FormsAppCompatActivity already contain the ViewModelStore method . It is the same effect with Native Android ViewModelStoreOwner to get ViewModelStore.

Here it the native ViewModelStoreOwner class:

public interface ViewModelStoreOwner {  
    /**  
     * Returns owned {@link ViewModelStore}  
     *  
     * @return a {@code ViewModelStore}  
     */  
    @NonNull  
    ViewModelStore getViewModelStore();  
}  

In Xamarin Android, you could write code as follows below FormsAppCompatActivity class:

public override ViewModelStore ViewModelStore => base.ViewModelStore;  

Then you also will get the ViewModelStore.

Best Regards,

Junior Jiang

----------

If the response is helpful, please click "Accept Answer" and upvote it.

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.