Question

I have a Child Activity which is returning an ArrayList to Parent Activity

Child Activity

ArrayList<Users> selectedMembers = new ArrayList<Users>();

//And then

Intent returnIntent = new Intent();

returnIntent.putExtra("ArrayOfUsers",selectedMembers);

setResult(RESULT_OK,returnIntent);        

finish();

Parent Activity

Now how to get this ArrayList<Users> on parent Activity

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data){
        if (resultCode == RESULT_OK) {


            //how to get ArrayList<Users> here
        }
    }

I did something like this but i gives error

selectedMembers.addAll((data.getParcelableArrayListExtra("ArrayOfUsers"));

error:

The method addAll(Collection<? extends Users>) in the type ArrayList<Users> is not applicable for the arguments (ArrayList<Parcelable>)

Answer 1

You are using different methods for serialization and deserialization. When you call returnIntent.putExtra actually this overloaded method in Intent class is called. So your list of users is actually treated as single Serializableobject. In this case putExtra at child side should be used in conjunction with getSerializableExtra getter at parent side.

If you want to use getParcelableArrayListExtra at parent side as getter method you should use it in conjunction with putParcelableArrayListExtra at child side and you Users class should be Parcelable.