Can the ViewModel have a constructor with arguments?

Can the ViewModel have a constructor with arguments?

While initializing subclasses of ViewModel using ViewModelProviders , by default it expects your UserModel class to have a zero argument constructor. In your case your constructor has the argument MutableLiveData user . java for Java code and this class GithubViewModelFactory.

What is the ViewModelFactory interface for?

ViewModelFactory. A ViewModelFactory instantiates ViewModel objects, with or without constructor parameters. In later codelabs, you learn about other Android Architecture Components that are related to UI controllers and ViewModel .

What is ViewModel in Kotlin?

The ViewModel class is designed to store and manage UI-related data in a lifecycle conscious way. The ViewModel class allows data to survive configuration changes such as screen rotations. The Android framework manages the lifecycles of UI controllers, such as activities and fragments.

How do I use the kotlin ViewModel?

In order to use ViewModel, add a dependency on androidx. lifecycle’s lifecycle-viewmodel-ktx library in your module’s build. gradle file and sync the changes. For every Activity or Fragment, whose data you want to preserve using ViewModel, creating a separate class is highly recommended.

Can ViewModel have constructor?

At present, this means that every ViewModel must have a public constructor which has either no parameters or which has only string parameters. So the reason your ViewModel isn’t loading is because the MvxDefaultViewModelLocator can’t find a suitable constructor for your ViewModel.

What is the difference between ViewModel and AndroidViewModel?

The difference between the ViewModel and the AndroidViewModel class is that the later one provides you with an application context, which you need to provide when you create a view model of type AndroidViewModel.

What is the difference between AndroidViewModel and ViewModel?

The only difference with AndroidViewModel is it comes with the application context, which is helpful if you require context to get a system service or have a similar requirement. the bold text makes it clearer to sense it. AndroidViewModel is subclass of ViewModel.

Is ViewModel Life Cycle Aware?

Lifecycle Awareness: ViewModel objects are also lifecycle-aware. They are automatically cleared when the Lifecycle they are observing gets permanently destroyed. Data Sharing: Data can be easily shared between fragments in an activity using ViewModels .

Should a ViewModel have a constructor?

How to pass custom arguments to a ViewModel?

Android’s new Architecture Components are a fantastic and simple way to help implement MVVM into your current or future android application. A must use for new and old developers alike. This article will cover using LiveData with your ViewModels as well as passing in custom arguments to this model using ViewModelProvider.Factory.

How does MVVM pass parameter to ViewModel constructor?

In Prism we do not directly pass to ViewModel but through Type and Service. In general MVVM you can do that but it is not suitable for big solution. Can you please give a super easy example on how to do this dependency property in the viewmodel and bind the attribute in the StaticResource. It would be super helpful!!!

Is there a way to pass additional argument to my custom androidviewmodel constructor?

Is there a way to pass additional argument to my custom AndroidViewModel constructor except Application context. Example:

How to add arguments to ViewModel in Kotlin?

(KOTLIN) My solution uses little bit of Reflection. Lets say you don’t want to create the same looking Factory class every time you create new ViewModel class which needs some arguments. You can accomplish this via Reflection.