Easy way to Toast with ViewModel, LiveData & a bit of abstraction. 3/4

UsableActivity.kt

class UsableActivity : BaseActivity() {

    private lateinit var viewModel: UsableViewModel
    override val baseViewModel: BaseViewModel?
        get() = viewModel

    // DataBinding stuff
    private lateinit var binding: ActivityUsableBinding

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        // DataBinding stuff
        binding = DataBindingUtil.setContentView(this@UsableActivity, R.layout.activity_usable)

        initViewModelAndBinding {
            // Do other stuff if needed
        }
    }

    /**
     * Do multiple things:
     *  - Initialize the current [viewModel] ViewModel
     *  - Do the binding
     *  - Initialize the [viewModel] observers
     */
    private fun initViewModelAndBinding(after: () -> Unit ) {
        viewModel = provideViewModel()
        binding.viewModel = viewModel
        binding.lifecycleOwner = this
        binding.executePendingBindings()
        initObservers()
        after()
    }

    /**
     * Should be done after [baseViewModel] instantiation
     */
    override fun initObservers() {
        // Important : don't forget to call the super method
        super.initObservers()
    }
  
}