When enabling the GPU Profiler on-screen bars we'll see the drawing performance. It stays nicely below/around the 60fps-mark when scrolling the RecyclerView directly.

But when using the FastScroller very fast, it'll show spikes and the app gets really laggy. This does not happen when scrolling slowly using the FastScroller.

This does not happen when scrolling fast using a fling on the RecyclerView itself.

It also does not happen in the standard-contacts-app (but I think they're using ListView?).

Does anyone have an idea on this issue?

Hey,

is it anyhow possible to let appbarlayout collapse or expand depending on how the fastscroller is moved to? (Collapsing when scrolling down the list, expanding when scrolling up)

Usually this will happen in RecyclerView automatically when scrolling up/down.

If I use notifyDataSetChanged() the bubble text and handle position is wrong.

@AndroidDeveloperLB First of all: Very nice tutorial and code! Thanks a lot.
Is it possible ti integrate your code in another lib? What license do you use?
And another question? Are there any bugs known or is any further improvement planned?

Scrolling normally on the RecyclerView, the Handle is not moving until the next item is reached and so it changes position suddenly: basically the movement is not linear.
This effect is more visible with few elements while with a lot of elements it might be considered acceptable, even if it is not nice to have/see.

I've Implemented your lib in DialogFrament, which has a RecyclerView inside it. It works but the speed of the scrolling is too low. Literally gets stucks when scrolling. but when i drag item in recyclerview it gets normal scrolling speed.

Hi, while dragging the handler, the bubble (and handler as well) jump below of few positions, to return to it's position immediately after. This happens at each element scrolled in/out of the RecyclerView. Always with few elements.

Also while scrolling normally on the RecyclerView, the Handler jumps to the "section" and the movement is not linear.

When I scroll RecyclerView by fastScroller,
I saw a lot of log.e like this:

04-28 12:28:51.009 29607-29607/ E/ViewDragHelper: Ignoring pointerId=0 because ACTION_DOWN was not received for this pointer before ACTION_MOVE. It likely happened because  ViewDragHelper did not receive all the events in the event stream.
04-28 12:28:51.061 29607-29607/ E/ViewDragHelper: Ignoring pointerId=0 because ACTION_DOWN was not received for this pointer before ACTION_MOVE. It likely happened because  ViewDragHelper did not receive all the events in the event stream.
04-28 12:28:51.179 29607-29607/ E/ViewDragHelper: Ignoring pointerId=0 because ACTION_DOWN was not received for this pointer before ACTION_MOVE. It likely happened because  ViewDragHelper did not receive all the events in the event stream.
04-28 12:28:51.306 29607-29607/ E/ViewDragHelper: Ignoring pointerId=0 because ACTION_DOWN was not received for this pointer before ACTION_MOVE. It likely happened because  ViewDragHelper did not receive all the events in the event stream.
04-28 12:28:51.383 29607-29607/ E/ViewDragHelper: Ignoring pointerId=0 because ACTION_DOWN was not received for this pointer before ACTION_MOVE. It likely happened because  ViewDragHelper did not receive all the events in the event stream.
04-28 12:28:51.479 29607-29607/ E/ViewDragHelper: Ignoring pointerId=0 because ACTION_DOWN was not received for this pointer before ACTION_MOVE. It likely happened because  ViewDragHelper did not receive all the events in the event stream.
04-28 12:28:51.497 29607-29607/ E/ViewDragHelper: Ignoring pointerId=0 because ACTION_DOWN was not received for this pointer before ACTION_MOVE. It likely happened because  ViewDragHelper did not receive all the events in the event stream.
04-28 12:28:51.528 29607-29607/ E/ViewDragHelper: Ignoring pointerId=0 because ACTION_DOWN was not received for this pointer before ACTION_MOVE. It likely happened because  ViewDragHelper did not receive all the events in the event stream.

How can I resolve this problem?

Hello @AndroidDeveloperLB, currently (as you know) I'm using your base FastScroller in my FlexibleAdapter library.
I don't know if I will continue to keep your base FastScroller or to change to another one, however, it now works when changing LayoutManager (switching from Linear to Grid and viceversa) and also with GridLayoutManager (probably it always worked with Grid).

In my version you will find more features: I had to customize it and improve it in order to fit in combination the adapter animations and beyond. Details are in my code.

Maybe if we work together we can add some nice features like the library I have found (see my issue).

steps:

1. make the items count to 20.
2. drag the fast-scroller to the middle (or anything else).
3. scroll a really tiny bit (in the recyclerView itself)

The bug: it shows the scrollber very far from its previous position.

Hi, I found out, that there is some issue with scrollbar, when user scrolls by dragging content (not by your scrollbar). Issue is better visible with fewer items (~20). When scrolling near end of list, scrollbar suddenly jumps all way down and then back again. It ends up somewhere in middle when content is scrolled to bottom entirely. Please review this issue - I will try to investigate it too.

Please update sample which work with design support library behaviour, when use fastscroll with recycleview its stop behaviour of autoscroll AppBar and Tabs

@AndroidDeveloperLB אני באמת צריך ליצור איתך קשר לגבי עבודה מרכזית, אנא שלח לי דוא"ל לכתובת [email protected]

Thanks for the excellent code.
Can you clarify the license so that I can understand if it's OK to use?

Shai