How to pass a parcelable object that contains a list of objects?

Question

I have created a Parcelable object below, my object contains a List of Products. In my constructor how do I handle re-creating my Parcelable<

Answer 1

First, your Product object must implements Parcelable.

And then, use dest.writeTypedList(products) in writeToParcel() method.

Finally, use following code to parse the list:

products = new ArrayList<Product>();
in.readTypedList(products, Product.CREATOR);

For more infomation, please reference the Official Document:

Answer 2

This should work:

in.readTypedList(products, Product.CREATOR);

Answer 3

Product must be implements Parcelable

  Product class implements  Parcelable {
          ......
  }

Then write you object contains list like

public class Outfits implements Parcelable {

     private String url;
     private String name;
     private List<Product> products;

     public Outfits (Parcel pi) {

        bookName = p.readString();
        bookId = p.readInt();
        isColor = p.readInt() == 1;

        //use this well be get err
        //products=p.readArrayList(Thread.currentThread().getContextClassLoader());

        //Pass list use this 
        products= in.createTypedArrayList(Product.CREATOR);

      }

            ...get and set...

     public void writeToParcel(Parcel dest, int flags) {


        dest.writeString(url);
        dest.writeString(name);

        //use this will no working
        //dest.writeList(products);

        //Parcelable list
        out.writeTypedList(products);

     }

 }

Answer 4

In my personal experience, http://www.parcelabler.com/ is an amazing site for this. You just create your class, and copy paste it into the website, and it generates a Parcelable version of your class.

I tested it with a class named "Theme" that contained the following variables:

private String name;
private int image;
private List<Card> cards;

The writeToParcel function becomes:

@Override
public void writeToParcel(Parcel dest, int flags) {
    dest.writeString(name);
    dest.writeInt(image);
    if (cards == null) {
        dest.writeByte((byte) (0x00));
    } else {
        dest.writeByte((byte) (0x01));
        dest.writeList(cards);
    }
}

generated constructor:

protected Theme(Parcel in) {
    name = in.readString();
    image = in.readInt();
    if (in.readByte() == 0x01) {
        cards = new ArrayList<Card>();
        in.readList(cards, Card.class.getClassLoader());
    } else {
        cards = null;
    }
}

EDIT: make sure that the Card object is also Parcelable!

Answer 5

Assuming the Product is implementing Parcelable, you can use this for writing:

dest.writeValue(products);

and this for reading:

products = (List<Product>) in.readValue(Product.class.getClassLoader());

Answer 6

If class Product is compatible with parcelable protocol, following should work according to documentation.

products = new ArrayList<Product>();
in.readList(products, Product.class.getClassLoader());