What is the Android ViewModel and how does it work?

What is the Android ViewModel and how does it work?

The Android ViewModel is a part of the Android Architecture Components. It is designed to store and manage UI-related data in a lifecycle-conscious way. This means it survives configuration changes like screen rotations.

How does it differ from other components like LiveData?

While ViewModel is responsible for holding and managing UI-related data, LiveData is an observable data holder that allows UI components to observe changes in the data. They often work together to create a responsive UI.

Can you give an example of how to implement a ViewModel?

Sure! You can create a ViewModel by extending the ViewModel class and then use it in your Activity or Fragment. For example:

class MyViewModel : ViewModel() {
    val data: MutableLiveData<String> = MutableLiveData()
}

Then, in your Activity:

val viewModel = ViewModelProvider(this).get(MyViewModel::class.java)