BuiVanNam

/**
 * Created by nambv on 11/18/2020
 */
sealed class EventItemBook {

    data class AddFavoriteBook(val book: Book) : EventItemBook()
    data class RemoveFavoriteBook(val book: Book) : EventItemBook()
    data class ActionOpenBook(val book: Book) : EventItemBook()
    data class OpenMenuBook(val book: Book) : EventItemBook()

BuiVanNam

/**
 * Created by nambv on 11/18/2020
 */
class BookAdapter : RecyclerView.Adapter<BookAdapter.BookViewHolder>() {

    //Define function type
    var mEventItemBook: ((EventItemBook) -> Unit)? = null

    /////Setup for BookAdapter/////////

BuiVanNam

    //Set mEventItemBook
    private val mBookAdapter: BookAdapter by lazy {
        BookAdapter().apply {
            mEventItemBook = { handleEventItemListBook(it) }
        }
    }
    
    //handleEvent
    private fun handleEventItemListBook(eventItemBook: EventItemBook) {
        Log.d("TODO", "event: $eventItemBook")

BuiVanNam

private val mBookAdapter: BookAdapter by lazy {
    BookAdapter().apply {
        setListenerEventItemBook(object : EventItemBook {
            override fun addFavoriteBook(book: Book) {
                Log.d("TODO", "addFavoriteBook: ")
            }
            override fun removeFavoriteBook(book: Book) {
                Log.d("TODO", "removeFavoriteBook: ")
            }
            override fun actionOpenBook(book: Book) {

BuiVanNam

class BookAdapter : RecyclerView.Adapter<BookViewHolder() {
    private var mEventItemBook: EventItemBook? = null
    fun setListenerEventItemBook(eventItemBook: EventItemBook) {
        this.mEventItemBook = eventItemBook
    }
///////
  inner class BookViewHolder(): RecyclerView.ViewHolder(itemView) {
    val mIconFavorite= itemView.findViewById(R.id.favorite)
       init {
           mIconFavorite.setOnClickListener {

BuiVanNam

interface EventItemBook {
    fun addFavoriteBook(book: Book)
    fun removeFavoriteBook(book: Book)
    fun actionOpenBook(book: Book)
    fun openMenuBook(book: Book)
}

BuiVanNam

class MainActivity : AppCompatActivity() {

    lateinit var instanceA : ClassA
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        instanceA = ClassA()
    }
    override fun onResume() {
        super.onResume()

BuiVanNam

class ClassA {

    var objectA = null

    init {
        objectA = getAFromFrameworkApi()
    }
    fun registerListenerAChange() {
        objectA.registerStateChange()
    }

BuiVanNam

class MainActivity : AppCompatActivity() {

    var objectA = null
    
    override fun onCreate(savedInstanceState: Bundle?) {
        ////
        initObjectA()
    }
    override fun onResume() {
        super.onResume()

BuiVanNam

//Not use Scope Functions
fun updateTextView(parentView: View) {
    val textView = parentView.findViewById<TextView>(R.id.text_view)
    if (textView != null) {
        textView.text = "nambv"
        textView.setTextColor(Color.RED)
        textView.textSize = 15f
        textView.maxLines = 1
        textView.gravity = Gravity.CENTER
    }