How to put set inside an Intent as an extra?

Question

I have a Set where the class Prova implements Serializable. I must put this Set in a intent. This is the code:

Set<Prova> set=..... // Set is declared first and it's not null
Intent intent = new Intent(getApplicationContext(), Example.class);
intent.putExtra("set",set);

This code gives me: "cannot Resolve method". Anyone can help me?

Answer 1

Try using HashSet instead of Set and then you can do something like this -

HashSet<Prova> set = new HashSet<>();
Intent intent = new Intent(getApplicationContext(), Example.class);
intent.putExtra("mySet", set);;

Set itself does not implement Serializable but HashSet does and Intent can hold an instance of any class that implements Serializable or Parcelable.