douglasiacovelli

fun onClickLikeButton() {
    if (viewModel.liked) {
        
        //First we update the local model so the user feels the action is instantaneous
        viewModel.liked = false
        viewModel.count--
        
        //Then we call the API to update it on the server
        apiService.removeLike.enqueue({ response -> 
            

douglasiacovelli

fun onClickLikeButton() {
    if (viewModel.liked) {
        removeLike()
    } else {
        addLike()
    }
}

private fun addLike() {
    

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class ViewModel {
    //... here comes the attributes and the model
    //we are changing (irrelevant for the example)
    
    fun addLikeLocally() {
        liked = true
        count++
    }
    
    fun removeLikeLocally() {

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fun onClickLikeButton() {
    if (viewModel.liked) {
        removeLike()
    } else {
        addLike()
    }
}

private fun showError(errorMessage: String) {
    Toast.makeToast(activity, errorMessage, LENGTH_LONG).show()

douglasiacovelli

dependencies {
  ...
}

//This step below fixes the issues
afterEvaluate {
    android.applicationVariants.all {
        def name = it.name.capitalize()
        tasks["kapt${name}Kotlin"].dependsOn("transformDataBindingWithDataBindingMergeArtifactsFor${name}")
    }

douglasiacovelli

object BindingAdapters {
  
  @BindingAdapter(values = ["selected", "options"], requireAll = false)
  @JvmStatic 
  fun setOptionsAndSelected(view: MyCustomView, selected: Option?, options: List<Option>?) {
    options?.let {
      view.setOptions(it) 
    }
    
    selected?.let {

douglasiacovelli

class SectionPagerAdapter(
    fragmentManager: FragmentManager,
    private val sections: List<Section>
): FragmentStatePagerAdapter(fragmentManager) {

    var currentFormSection: FormSection? = null

    override fun getItem(position: Int): Fragment {
        return when (sections[position].type) {
            SectionType.MAP -> MapFragment.newInstance(sections[position])

douglasiacovelli

class MainActivity : AppCompatActivity() {

    private val viewPager by lazy { findViewById<ViewPager>(R.id.viewPager) }

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

        //getSections somehow from API/local storage

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class FormFragment : Fragment() {

    private val section by lazy { arguments!!.getParcelable<Section>(SECTION) }
    private val fieldInputs = mutableListOf<FieldInput>()

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        val view = inflater.inflate(R.layout.form_section_fragment, container, false)
        return view
    }

douglasiacovelli

interface FieldInput {
    var key: String
    fun getValue(): String
    fun setHint(hint: String)
}