Android: SortedList with duplicates

Question

I have some problems understanding RecyclerViews SortedList.

Lets say I have a very simple class only having a very simple class holding data:<

Answer 1

You can check if the object already exist in the sorted list by doing this.

if (sortedList.indexOf(item) == -1) 
{
    sortedList.add(item);  //Item still does not exist because index is -1
} 
else 
{
    sortedList.updateItemAt(sortedList.indexOf(item), item);
}