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class SyncViewModel : BaseViewModel() {
  
    fun loadCacheFirebaseConfig() {
        firebaseRemoteConfigInstance.apply {
            RemoteConfigKey.values().forEach { key ->
                getString(key.name)
                        .takeIf { it.isNotBlank() }
                        ?.let { newValue ->
                            val remoteConfigData = RemoteConfigData(key, newValue)
                            LocalConfig.setData(remoteConfigData)

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/**
 * Extension method to show toast for Context.
 */
fun Context?.toast(@StringRes textId: Int, duration: Int = Toast.LENGTH_SHORT) = this?.let { Toast.makeText(it, textId, duration).show() }

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class UsableViewModel : BaseViewModel() {

    fun load() {
        setMessage(R.string.data_loaded)
    }

    fun reset() {
        setMessage(R.string.data_reset)
    }

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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?) {

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/**
 * Base for other ViewModel
 */
abstract class BaseViewModel: ViewModel() {

    // Mutable/LiveData of String resource reference Event
    private val _message = MutableLiveData<Event<Int>>()
    val message : LiveData<Event<Int>>
        get() = _message

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/**
 * 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]

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<link rel="import" href="../components/polymer/polymer.html">

<polymer-element name="my-element">

  <template>
    <style>    
      :host {
        position: absolute;
        width: 100%;
        height: 100%;