Main Activity with ViewModel instance and LiveData observe

MainActivity.kt

class MainActivity : LifecycleActivity() {
    
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        // Get the ViewModel instance
        val userViewModel = ViewModelProviders.of(this).get(UserViewModel::class.java)       
        userViewModel.getUsers().observe(this, Observer {
           // Update the UI
        })
    }
}