Easy way to Toast with ViewModel, LiveData & a bit of abstraction. 1/4

BaseActivity.kt

/**
 * Base for other activities
 */
abstract class BaseActivity : AppCompatActivity() {

    abstract val baseViewModel: BaseViewModel?

    // Get a ViewModel that is a BaseViewModel
    protected inline fun <reified T : BaseViewModel> provideViewModel(): T = ViewModelProviders.of(this)[T::class.java]

    /**
     * When a message event is thrown, handle it and show it
     */
    protected open fun initObservers() {
        baseViewModel?.message?.observe(this, Observer { event ->
            event.getContentIfNotHandled()?.let { message ->
                // Toast the [message]
                toast(message)
            }
        })
    }

}