Use of methods getItemViewType and getItemId of Recycler view

Question

I had a problem: when i clicked a checkbox of single item in recycler view, other item's checkboxes also got selected....But when i overided these two methods and returen position with it,problem was solved.... So my question is how did they solve my problem???

Already know what is written in android documentation.

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

@Override
public int getItemViewType(int position) {
    return position;
}

they actually tell which item is clicked by passing the position from the list — Lakhwinder Singh, Jul 22 '19 at 10:35
weird, have you added if else checks in ViewHolder? Because it is not enough to use 'if' only — Antonis Radz, Jul 22 '19 at 10:42
i think notification of previously selected element is also necessary along with if else — Neha Rathore, Jul 22 '19 at 10:55
When you want to define HeaderView and ChildView in adapter, You can use getItemViewType.Where getItemId is unique id of your single item in adapter. — Hardik Bambhania, Jul 22 '19 at 11:50

score 1 · Answer 1 · answered Jul 22 '19 at 12:52

getItemViewType() is mainly used when you want show different types of view based on your position .

Let say you have a chat adapter , sender user chat should comes in right while receiver user chat should comes in left . In such scenrio , you can use getItemViewType (based of user id , you can show the different views)

getItemId() : We usually use this , when we try to do specific task for particular item . For getItemId you may check this . What is the intent of the methods getItem and getItemId in the Android class BaseAdapter?

Use of methods getItemViewType and getItemId of Recycler view

1 Answers1