animatedVectorDrawable is not animating in for loop

Question

I have been trying to implement animation vectors . I managed to do it correctly but there's seem to be a problem. I used recycler view to display all contacts. I have used selected and unselected functions to play animations on contact profile pic. I did it and selecting and unselecting animations have been working correctly but when I tried to unselect all selected contacts through this loop it seems to be not working and it only happens when I want to unselect them all .

    private void deselectAll(viewHolder holder) {
        for(int i = 0; i < selected_contacts.size(); i++){
            unselected(holder, contacts.indexOf(selected_contacts.get(i)),true);
        }
        selected_contacts.clear();
    }

i have used unselected function which's code is down below. can anybody help me with this problem here cause i cant seem to figure it out.

private void unselected(viewHolder holder, int position, boolean b) {
        if(!b){
        selected_contacts.remove(contacts.get(position));
        }
        contacts.get(position).setSelected(false);

        AnimatedVectorDrawable animatedVectorDrawable = (AnimatedVectorDrawable) AppCompatResources.getDrawable(context, R.drawable.item_unselected);
        holder.image2.setBackground(animatedVectorDrawable);
        animatedVectorDrawable.start();

        Contact.selectedItems--;
        Log.i("items", "numbers of selected items are updated to " + Contact.selectedItems);

        String top_text = Contact.selectedItems + " Contacts selected";
        selectedItems.setText(top_text);

        Log.i("animation", "animation of item no " + position + " is unselected");
    }

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And also animation is not working even for single item selected when tried to use setImageDrawable instead of setBackground idk what's the difference.

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If you wanna see my whole project here is link to My project : https://github.com/kevaldonga/contacts