Passing ArrayList<CustomObject> Between Activities
android, android-activity, arraylist, parcelable
Solution
This code
Bundle informacion= new Bundle();
informacion.putParcelableArrayList("eventos", ArrayList<Eventos> eventos);
intent.putExtras(informacion);
Should be
Bundle informacion = new Bundle();
ArrayList<Eventos> mas = new ArrayList<Eventos>();
informacion.putSerializable("eventos", mas);
intent.putExtras(informacion);
and Make sure your Eventos structure like a serializable object
private class Eventos implements Serializable {
}
Reading Values
ArrayList<Eventos> madd=getIntent().getSerializableExtra(key);
Problem
i've implemented a Parcelable class: ``` public class Evento implements Parcelable { private int; private String ; private String imagen; //more atts //Constructors, setters and getters public Evento(Parcel in) { this.id = in.readInt(); this.titulo = in.readString(); this.imagen=in.readString(); public void writeToParcel(Parcel dest, int flags) { dest.writeInt(id); dest.writeString(titulo); dest.writeString(imagen); } public static final Parcelable.Creator<Evento> CREATOR = new Parcelable.Creator<Evento>() { @Override public Evento createFromParcel(Parcel in) { return new Evento(in); } @Override public Evento[] newArray(int size) { return new Evento[size]; } }; ``` In my activity, i'm trying to pass an arrayList to an other activitie: I'me overwriten onItemClick and i'm passing the information this way: ``` public void onItemClick(AdapterView<?> a, View v, int position, long id) { //create new activitie ArrayList<Eventos> eventos = new ArrayList<Eventos>(); Intent intent = new Intent(QueActivity.this, ProductosCategorias.class); //Create information Bundle informacion= new Bundle(); informacion.putParcelableArrayList("eventos", eventos); intent.putExtras(informacion); ``` and receiving it in the other activity: ``` protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_productos_categorias); lv = (ListView) findViewById(R.id.listaCategoriaElegida); Bundle informacionRecibida = getIntent().getExtras(); ArrayList<Evento> eventos =new ArrayList<Evento>(); eventos= informacionRecibida.getParcelableArrayList("eventos"); ``` I'm getting a null pointer exception. I've debbuged it and i'm getting NULL when i execute the getParcelableArrayList("eventos"), i mean, my arraylist eventos is null, so, i'm receiving no information. Any help will be great