how to collapse all childviews on expandable recycler view

Question

i have my expandable recyclerview set with two layouts HEADER and CHILD. Everything is working fine.

i have used different layouts for header and child.

when the users click one header, i want my program to check if any other header is expanded. if yes it needs to be collapsed. onclicking one menu the last expanded view should collapse.

i have tried using boolean flag. can anyone please help me

visit this https://www.bignerdranch.com/blog/expand-a-recyclerview-in-four-steps/ — , Apr 08 '16 at 10:34

score 0 · Answer 1 · answered Apr 08 '16 at 10:55

0

If you have a Boolean flag so save expand collapse states. You can write a function to Iterate your data-set ArrayList and set it to false/true and call

adapter.notifyDatasetChanged();

answered Apr 08 '16 at 10:55

H.T

161
7

score 0 · Accepted Answer · answered Apr 08 '16 at 14:00

0

If you use this library to create your expandable sections like in this example, you can loop through the instances of your ExpandableContactsSection and check the flag 'expanded'.

answered Apr 08 '16 at 14:00

Gustavo Pagani

6,583
5
40
71

cool, would you please consider accepting my answer then? you can do it clicking on the tick on the left – Gustavo Pagani Apr 10 '16 at 15:41

score 0 · Answer 3 · answered Jul 30 '18 at 21:19

Working with Big Nerd Ranch recycler:expand library ('com.bignerdranch.android:expandablerecyclerview:1.0.3')

In RecyclerAdapter.Java code...

 @Override
public void onParentItemClickListener(int position) {
    /**
     * @Params
     * Se comienza en -1, al clickear el primer grupo, se registra en la variable su posicion
     * al clickear el siguiente grupo, si la variable no es igual a su posicion se procede a
     * cerrar el grupo anterior.
     * */

    Object parent = mParentItemList.get(position);
    //Toast.makeText(mContext,"posicion "+String.valueOf(position),Toast.LENGTH_SHORT).show();

    if(lastExpanded == -1){
        lastExpanded = position;

    } else if(lastExpanded == position){
        lastExpanded = -1; //Reinicia Variable

        notifyItemChanged(position);
    }else{
        //Cierra grupo abierto
        int oldExpand = lastExpanded;
        Toast.makeText(mContext,"se cerro  "+String.valueOf(oldExpand),Toast.LENGTH_SHORT).show();
        lastExpanded = position;

        //Need the colapse group code

        notifyItemChanged(oldExpand);
        notifyItemChanged(position);
    }

    super.onParentItemClickListener(position);
}

I need how to collapse group after clicking another parentGroup...

If you have the solution, comment me please

how to collapse all childviews on expandable recycler view

3 Answers3