What are some examples of using ViewModel in Android?

What are some examples of using ViewModel in Android?

ViewModel is used to manage UI-related data in a lifecycle-conscious way. For example, you can use it to store user input in a form, ensuring that data survives configuration changes like screen rotations.

Can you give me a code snippet for a simple ViewModel implementation?

Sure! Here's a basic example:

class MyViewModel : ViewModel() {
    var userName: String? = null
}

You can then use this ViewModel in your Activity or Fragment to retain the userName across configuration changes.

How do I observe LiveData from the ViewModel?

You can observe LiveData in your Activity or Fragment like this:

viewModel.userName.observe(this, Observer { name ->
    // Update the UI with the new name
})

What are the benefits of using ViewModel?

The main benefits include better separation of concerns, lifecycle awareness, and the ability to retain data across configuration changes.