@SuppressWarnings("unchecked") @Override public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position, @NonNull List<Object> payloads) { if (mExpandableItemAdapter == null) { return; } final long expandablePosition = mPositionTranslator.getExpandablePosition(position); final int groupPosition = ExpandableAdapterHelper.getPackedPositionGroup(expandablePosition); final int childPosition = ExpandableAdapterHelper.getPackedPositionChild(expandablePosition); final int viewType = (holder.getItemViewType() & (~VIEW_TYPE_FLAG_IS_GROUP)); // update flags int flags = 0; if (childPosition == RecyclerView.NO_POSITION) { flags |= Constants.STATE_FLAG_IS_GROUP; } else { flags |= Constants.STATE_FLAG_IS_CHILD; } if (mPositionTranslator.isGroupExpanded(groupPosition)) { flags |= Constants.STATE_FLAG_IS_EXPANDED; } safeUpdateExpandStateFlags(holder, flags); correctItemDragStateFlags(holder, groupPosition, childPosition); if (childPosition == RecyclerView.NO_POSITION) { mExpandableItemAdapter.onBindGroupViewHolder(holder, groupPosition, viewType, payloads); } else { mExpandableItemAdapter.onBindChildViewHolder(holder, groupPosition, childPosition, viewType, payloads); } }