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Learn more about Teams if(edtNombre.text.toString().equals("") || edtApellido.text.toString().equals("") || edtFecha.text.toString().equals("")){ Toast.makeText(this@Main2Activity, "Debes llenar todos los campos!", Toast.LENGTH_SHORT).show() }else{ var estadoSel : String estadoSel = estado.onItemSelectedListener.toString() var per = Persona(edtNombre.text.toString(),edtApellido.text.toString(),estadoSel,edtFecha.text.toString()) personas.add(per) val intent = Intent(this@Main2Activity,Main3Activity::class.java) //intent.putExtra("Personas", personas as Serializable) intent.putParcelableArrayListExtra("Personas", ArrayList(personas)) edtFecha.text = null edtApellido.text = null edtNombre.text = null estado.setSelection(0) Toast.makeText(this@Main2Activity, "Registro Guardado", Toast.LENGTH_SHORT).show()

Activity B:

 override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main3)
        supportActionBar?.setDisplayHomeAsUpEnabled(true)
        //val intent = Intent()
        val bundle = getIntent().extras
        var arr  = bundle?.getParcelableArrayList<Persona>("Personas")!!
        //var arr : ArrayList<Persona> = (ArrayList<Persona>())intent.getSerializableExtra("Personas")
        //intent.getSerializableExtra("Personas")
        //arr = intent.extras!!.get("Personas")
        val adapter = ArrayAdapter(this, android.R.layout.simple_list_item_1, arr)
        listaPersonas.adapter = adapter
But I'm getting a Null Pointer Exception
                Which line you are getting nullpointer Exception ? Did you implement Parcelable interface on Persona?
– Abu Yousuf
                Oct 9, 2019 at 5:08
In your app's build.gradle under android scope add this and sync gradle -
androidExtensions {
        experimental = true
Then make your object class parceble as follows -
@Parcelize
data class Persona() : Parcelable {
Now you can send and receive Parcelable list by intent.
Update : @Parcelize is no more experimental now, follow this answer for updated implementation https://stackoverflow.com/a/64925204/9854554
To pass List of Data via intent implement Parcelable interface on Model class.
Person Model Class:
import android.os.Parcel
import android.os.Parcelable
data class Person(val name: String?, val age: Int) : Parcelable {
    constructor(source: Parcel) : this(
        source.readString(),
        source.readInt()
    override fun describeContents() = 0
    override fun writeToParcel(dest: Parcel, flags: Int) = with(dest) {
        writeString(name)
        writeInt(age)
    companion object {
        @JvmField
        val CREATOR: Parcelable.Creator<Person> = object : Parcelable.Creator<Person> {
            override fun createFromParcel(source: Parcel): Person = Person(source)
            override fun newArray(size: Int): Array<Person?> = arrayOfNulls(size)
MainActivity: 
class MainActivity : AppCompatActivity() {
    var personList = arrayListOf<Person>()
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        personList.add(Person("Person1", 31))
        personList.add(Person("Person2", 32))
        personList.add(Person("Person3", 33))
        var intent = Intent(this, BActivity::class.java)
        intent.putParcelableArrayListExtra("personList", personList)
        Handler().postDelayed( {startActivity(intent)}, 2000)
BActivity: 
class BActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_b)
        val extras = intent.extras
        val personList = extras?.getParcelableArrayList<Person>("personList")
        if (personList != null) {
            personList.forEach { Log.i("BActivity", "Name: ${it.name} Age: ${it.age}" ) }
        }else{
            Log.i("BActivity", "PersonList in null");
In your activity B to get your list try like the following 
var arr = this.getIntent().getParcelableArrayListExtra<Parcelable>("Personas")
and make sure your Persona is extend Parcelable like below.
class Persona() : Parcelable {
   // ....
   @Override
   public void writeToParcel(Parcel dest, int flags) {
       //....
   private void readFromParcel(Parcel in) {
      //....
   override fun describeContents(): Int {
      return 0
   companion object CREATOR : Creator<Persona> {
    override fun createFromParcel(parcel: Parcel): Persona{
      return Persona(parcel)
    override fun newArray(size: Int): Array<Persona?> {
      return arrayOfNulls(size)
In your, Activity A send array list with
intent.putParcelableArrayListExtra("Personas", personas)
In your, Activity B get array list with
intent.getParcelableArrayListExtra("Personas")
In your app's build.gradle inside android tag add this and sync with gradle -
androidExtensions {
        experimental = true
Data Class
@Parcelize data class Persona(
    val name: String,
    ) : Parcelable
  val intent = Intent(this, B::class.java)
            intent.putParcelableArrayListExtra("list", personaArrayList)
            startActivity(intent)
Step 4: In activity B for recieving data: 
 val list = intent.getParcelableArrayListExtra<Persona>("list")
        
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