manuelernesto

 private fun apagarPalestrante() {
        AlertDialog.Builder(requireContext()).apply {
            setTitle("Deseja realmente apagar?")
            setNegativeButton("Não") { _, _ ->

            }
            setPositiveButton("Sim") { _, _ ->
                launch {
                    context.let {
                        PalestranteDB.getDatabase(it).dao().apagar(mPalestrante!!)

manuelernesto

   ...
   <Button
        android:id="@+id/room_btn_apagar"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="32dp"
        android:text="@string/txt_apagar"
        android:visibility="invisible"
        app:layout_constraintEnd_toEndOf="@+id/room_btn_salvar"
        app:layout_constraintStart_toStartOf="@+id/room_btn_salvar"

manuelernesto

... 
private var mPalestrante: Palestrante? = null
...

manuelernesto

...
launch {
  context?.let {
    if (mPalestrante != null) {
        palestrante.id = mPalestrante!!.id
        PalestranteDB.getDatabase(it).dao().actualizar(palestrante)
        Toast.makeText(it, "Palestrante actualizado!", Toast.LENGTH_SHORT).show()
     } else {
        PalestranteDB.getDatabase(it).dao().salvar(palestrante)
        Toast.makeText(it, "Cadastro com sucesso!", Toast.LENGTH_SHORT).show()

manuelernesto

   holder.view.setOnClickListener {
            val action = HomeFragmentDirections.toSpeakersFragment()
            action.palestrante = palestrantes[position]
            Navigation.findNavController(it).navigate(action)
}

manuelernesto

    ...
    <fragment
        android:id="@+id/speakersFragment"
        android:name="io.github.manuelernesto.listofspeakers.ui.SpeakersFragment"
        android:label="@string/txt_cadastro"
        tools:layout="@layout/fragment_speakers">
        <action
            android:id="@+id/to_homeFragment"
            app:destination="@id/homeFragment" />
        <argument

manuelernesto

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

        rv_room.setHasFixedSize(true)
        rv_room.layoutManager = LinearLayoutManager(context)

        launch {
            context?.let {
                val palestrantes = PalestranteDB.getDatabase(it).dao().buscarTodos()
                rv_room.adapter =  PalestranteAdapter(palestrantes)

manuelernesto

class PalestranteAdapter(private val palestrantes: List<Palestrante>) :
    RecyclerView.Adapter<PalestranteAdapter.PalestranteViewHolder>() {

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int) = PalestranteViewHolder(
        LayoutInflater.from(parent.context).inflate(R.layout.palestrante_item, parent, false)
    )

    override fun onBindViewHolder(holder: PalestranteViewHolder, position: Int) {
        holder.view.room_item_txt_nome.text = palestrantes[position].palestrante
        holder.view.room_item_txt_tecnologia.text = palestrantes[position].tecnologia

manuelernesto

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <TextView
        android:id="@+id/room_item_txt_nome"
        android:layout_width="0dp"

manuelernesto

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

        room_btn_salvar.setOnClickListener {
            val palestrante = Palestrante(
                palestrante = room_et_nome.text.toString(),
                tecnologia = room_et_tecnologia.text.toString(),
                topico = room_et_topico.text.toString()
            )