What is the difference between "returning super.getItemId(position)" and just returning "return position"

Question

what is the difference between returning super.getItemId(position) and just returning return position?

@Override
public long getItemId(int position) {
    return super.getItemId(position);
}

@Override
public long getItemId(int position) {
    return position;
}

@Pavneet_Singh I just wanna know what difference it makes in recyclerView, — subrata sharma, Feb 03 '20 at 11:01
if you have answer please write one line about it thanks.@Pavneet_Singh — subrata sharma, Feb 03 '20 at 11:02
the concepts here is just `super` usage, `super.getItemId(position)` call a getItemId method of super class and use its return value — Pavneet_Singh, Feb 03 '20 at 11:03
I understand that much, what I wanna know is the difference in term of result when returning from getItemId from recyclerView, thanks. @Pavneet_Singh — subrata sharma, Feb 03 '20 at 11:09
depends on the logic inside `getItemId` method, it could be any class or logic so do command or control+B on method and find it yourself :) — Pavneet_Singh, Feb 03 '20 at 11:15
that's what I wanted to ask and discuss in my question, thanks anyway.@Pavneet_Singh — subrata sharma, Feb 03 '20 at 11:54
got it, please read the answer then though I wanted to explain the concept so that you can read it by yourself — Pavneet_Singh, Feb 03 '20 at 12:01
ok , thanks please give an upvote if you can :) @Pavneet_Singh — subrata sharma, Feb 03 '20 at 12:05

score 1 · Accepted Answer · answered Feb 03 '20 at 12:07

Read the explanation about super.

Calling super.getItemId(position) will call the getItemId method in the Recyclerview adapter class which will return -1 as

   /**
     * Return the stable ID for the item at <code>position</code>. If {@link #hasStableIds()}
     * would return false this method should return {@link #NO_ID}. The default implementation
     * of this method returns {@link #NO_ID}.
     *
     * @param position Adapter position to query
     * @return the stable ID of the item at position
     */
    public long getItemId(int position) {
        return NO_ID;
    }

so you must override getItemId method to send unique int ID(like return position) which will be used to find holders, children etc for animation, holder reusability and often during testing etc.

What is the difference between "returning super.getItemId(position)" and just returning "return position"

1 Answers1