Update view from normal header to sticky header

In my app, the sticky headers have an extra view added to them over the basic header. How can I do this? I tried forking the library and adding the sticky header position to the IFlexible onBindView method: bindViewHolder(FlexibleAdapter adapter, VH holder, int position, int stickyPosition, List payloads)

This way I can update the sticky header, but the changes are not reverted when the sticky header is changed, because the header is not bound again.

Congratulations for the library! It is very powerful, but the FlexibleAdapter class is huge. It’s size should be reduced. Maybe more helper classes like StickyHeaderHelpercould be made.

Any help is welcome, thanks!

[NegreaVlad]

@davideas Thanks for the help, you are 100% right. The alpha animation was caused by the DefaultItemAnimator.

Both of your suggestions fix the issue. I had gone with the first, using notifyItemChanged(mStickyHeaderPosition, payload); to keep the add/remove animations.

The final code:

    @Override
    public void bindViewHolder(FlexibleAdapter adapter, MeetingsHeaderViewHolder holder, int position, List payloads) {
        if (adapter.getStickyPosition() == position) {
            showTodayJump(holder);
        } else {
            hideTodayJump(holder);

            if (payloads.size() == 1 && payloads.get(0) instanceof UpdateHeaderEvent) {
                return;
            }
        }

        holder.mDayTV.setText(mDayNumber);
        holder.mMonthTV.setText(mMonth);

        setupWeekday(holder);
        setupDateColor(holder);
    }

                .addListener(
                        (FlexibleAdapter.OnStickyHeaderChangeListener) index -> {
//                            mHandler.post(() -> {
                                // If there is a previous sticky header or this is the first header that is converted to a
                                // sticky header
                                if (mStickyHeaderPosition != -1 || index == 0) {
                                    Log.d("StickyHeaderButton", "initializeRecyclerView: Notifying sticky position changed: " + mStickyHeaderPosition);
                                    mAdapter.notifyItemChanged(mStickyHeaderPosition, new UpdateHeaderEvent());
                                }

                                mStickyHeaderPosition = index;
//                            });
                        });

UpdateHeaderEvent is an empty POJO.

[davideas]

The second solution, in bindViewHolder you have the position and adapter.getStickyPosition().