CODEWITHSUNDEEP
androidandroid-recyclerview
serg66
serg66

Reputation: 1148

How to get an adapter item object from a LayoutManager view (RecyclerView)

I'm using RecyclerView to which I attach a LinearLayoutManager and a RecyclerView.Adapter

    RecyclerView conversationList = (RecyclerView)findViewById(R.id.conversationList);
    LinearLayoutManager layoutManager = new LinearLayoutManager(this);
    conversationList.setLayoutManager(layoutManager);
    MessagesAdapter adapter = new MessagesAdapter();
    conversationList.setAdapter(adapter);

In onBindViewHolder of RecyclerView.Adapter I'm passing the adapter item object to the view by using setTag:

    @Override
    public void onBindViewHolder(ViewHolder viewHolder, int position) {
        viewHolder.itemView.setTag(getItem(position));
        ...
    }

I'm iterating over child views of the layoutManager and get the needed object by using the getTag method

        for (int i = 0; i < layoutManager.getChildCount(); i++) {
            LinearLayout container = (LinearLayout)layoutManager.getChildAt(i);
            LinearLayout container2 = (LinearLayout)container.getChildAt(0);
            Object tag = container2.getTag();
        }

It doesn't seem right to me. Is there a better way of doing this?

Upvotes: 2

Views: 3487

Answers (2)

yychai
yychai

Reputation: 11

when you scroll the view,the ViewHolder may reused, so it`s was reset. Due to this you may get a wrong tag when you want get it.

Upvotes: 1

yshahak
yshahak

Reputation: 5096

You can add something like that to your Adapter class:

public ArrayList<Objects> getAllTags(){
    ArrayList<Objects> arrayList = new ArrayList<>();
    for (int i = 0; i < getItemCount() ; i++){
        arrayList.add(getItem(i));
    }
    return arrayList;
}

And the retrieve the objects via:

adapter.getAllObjects();

I'm assume that :

getItem(position)

Is method you defines in adapter class.

Upvotes: 0

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