danoz73/recyclerviewfastscroller

A Fast Scroller for the RecyclerView world!

recyclerviewfastscroller's Issues

NullPointerException with null data in adapter

My data in my adapter is empty when the view is loaded and I get the following exception.

java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.ViewParent android.view.View.getParent()' on a null object reference
at android.support.v7.widget.RecyclerView.getChildViewHolder(RecyclerView.java:2567)
at xyz.danoz.recyclerviewfastscroller.calculation.progress.VerticalLinearLayoutManagerScrollProgressCalculator.calculateScrollProgress(VerticalLinearLayoutManagerScrollProgressCalculator.java:29)
at xyz.danoz.recyclerviewfastscroller.AbsRecyclerViewFastScroller.onLayout(AbsRecyclerViewFastScroller.java:202)
at android.view.View.layout(View.java:15596)
at android.view.ViewGroup.layout(ViewGroup.java:4966)

The problem is in VerticalLinearLayoutManagerScrollProgressCalculator:

@Override
public float calculateScrollProgress(RecyclerView recyclerView) {
    LinearLayoutManager layoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
    int lastFullyVisiblePosition = layoutManager.findLastCompletelyVisibleItemPosition();

    View visibleChild = recyclerView.getChildAt(0);
    ViewHolder holder = recyclerView.getChildViewHolder(visibleChild);

There is no child at index 0.

This method should handle the case when the RecyclerView has no children, such as when there is not yet any data.

adding position offset

Would u add position offset on the indicator?

https://www.youtube.com/watch?v=8PEc0yUjvII
https://www.youtube.com/watch?v=iywKob92oLY
https://www.youtube.com/watch?v=0rnUOYkUHwk

[Request] Push to maven center.

Crash on setRecyclerView

Hi!
I use RecycleView 22.2.1 version and get fatal exception after attemting to set my RecycleView to VerticalRecyclerViewFastScroller via method setRecyclerView.
Here's the exception:

java.lang.NullPointerException: Attempt to invoke virtual method 'void xyz.danoz.recyclerviewfastscroller.vertical.VerticalRecyclerViewFastScroller.setRecyclerView(android.support.v7.widget.RecyclerView)' on a null object reference

It seems like the same problem as #21

And I have another question. Method setOnScrollListener is deprecated now. Should I use addOnScrollListener instead? Is it compatible with your implementation of fast scroll?

Btw, thnx a lot for your lib )

Request: add horizontal scroller

as the title says.

How to bind dataset with the sectionIndicator?

Any help will be highly appreciated!

does it support auto hide when user stop scrolling?

does it support auto hide when user stop scrolling?

Automatically hide when not scrolling

This is a feature enhancement request.

• Automatically hide the fast scroller when not scrolling like the ListView's one behaves so.

Upload to jcenter

Scroll Progress Calculation not smooth

I didn't test but couldn't this

 @Override
    public float calculateScrollProgress(RecyclerView recyclerView) {
        LinearLayoutManager layoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
        int lastFullyVisiblePosition = layoutManager.findLastCompletelyVisibleItemPosition();

        View visibleChild = recyclerView.getChildAt(0);
        if (visibleChild == null) {
            return 0;
        }
        ViewHolder holder = recyclerView.getChildViewHolder(visibleChild);
        int itemHeight = holder.itemView.getHeight();
        int recyclerHeight = recyclerView.getHeight();
        int itemsInWindow = recyclerHeight / itemHeight;

        int numItemsInList = recyclerView.getAdapter().getItemCount();
        int numScrollableSectionsInList = numItemsInList - itemsInWindow;
        int indexOfLastFullyVisibleItemInFirstSection = numItemsInList - numScrollableSectionsInList - 1;

        int currentSection = lastFullyVisiblePosition - indexOfLastFullyVisibleItemInFirstSection;

        return (float) currentSection / numScrollableSectionsInList;
    }

be replaced with this?

 public float calculateScrollProgress(RecyclerView recyclerView) {
        float scrollOffset = recyclerView.computeVerticalScrollOffset();
        float scrollRange = recyclerView.computeVerticalScrollRange();
        float scrollExtent = recyclerView.computeVerticalScrollExtent();
        return scrollOffset / (scrollRange - scrollExtent);
    }

Cannot load dependency

Getting an error when adding compile 'xyz.danoz:recyclerviewfastscroller:0.1.3' into dependency section of build.gradle.

Error:A problem occurred configuring project ':app'.
Could not resolve all dependencies for configuration ':app:_debugCompile'.
Could not find com.android.support:recyclerview-v7:22.1.0.
Required by:
XXX:app:unspecified
XXX:app:unspecified > xyz.danoz:recyclerviewfastscroller:0.1.3
Could not find com.android.support:support-v4:22.1.0.
Required by:
XXX:app:unspecified > xyz.danoz:recyclerviewfastscroller:0.1.3

Bar termination style not like standard android scroller

Please see the attached image.

Character is not shows in bubble

I have used code as follow, but I don't able to see the character in bubble.

In JavaFile:

RecyclerView recyclerView = (RecyclerView) findViewById(R.id.rvAddColorMarkUserLists);
VerticalRecyclerViewFastScroller fastScroller =(VerticalRecyclerViewFastScroller) findViewById(R.id.fast_scroller);
SectionTitleIndicator sectionTitleIndicator =(SectionTitleIndicator) findViewById(R.id.fast_scroller_section_title_indicator);
fastScroller.setRecyclerView(recyclerView);

recyclerView.setAdapter(usersAdapter);
recyclerView.setItemAnimator(new DefaultItemAnimator());
// Connect the scroller to the recycler (to let the recycler scroll the scroller's handle)

// Connect the section indicator to the scroller
fastScroller.setSectionIndicator(sectionTitleIndicator);
recyclerView.setOnScrollListener(fastScroller.getOnScrollListener());
setRecyclerViewLayoutManager(recyclerView);

In xml file

<android.support.v7.widget.RecyclerView
android:id="@+id/rvAddColorMarkUserLists"
style="@style/recyclerViewListView"
android:visibility="visible"
android:paddingTop="10dp" />

    <xyz.danoz.recyclerviewfastscroller.vertical.VerticalRecyclerViewFastScroller
        android:id="@+id/fast_scroller"
        android:layout_width="24dp"
        android:layout_height="match_parent"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        android:paddingRight="@dimen/margin_small"
        android:paddingEnd="@dimen/margin_small"
        recyclerviewfastscroller:rfs_barColor="@color/white"
        recyclerviewfastscroller:rfs_handleBackground="@drawable/fast_scroller_handle_rounded"
        />
    <xyz.danoz.recyclerviewfastscroller.sectionindicator.ui.ColorGroupSectionTitleIndicator
        android:id="@+id/fast_scroller_section_title_indicator"
        android:layout_width="wrap_content"
        android:layout_height="@dimen/list_item_height"
        android:layout_toLeftOf="@id/fast_scroller"
        android:layout_toStartOf="@id/fast_scroller"
        recyclerviewfastscroller:rfs_backgroundColor="@color/red"
        recyclerviewfastscroller:rfs_textColor="@android:color/white"
        />

Switch to normal scroller if the list items are not so many

This is a feature enhancement request.

• Automatically switch to use the normal scroller when list items are not so many (like ListView's behaves so)

NullPointerException right when starting the sample

I keep getting this exception:

java.lang.NullPointerException: Attempt to invoke interface method 'float xyz.danoz.recyclerviewfastscroller.calculation.progress.TouchableScrollProgressCalculator.calculateScrollProgress(android.support.v7.widget.RecyclerView)' on a null object reference
    at xyz.danoz.recyclerviewfastscroller.AbsRecyclerViewFastScroller$1.onScrolled(AbsRecyclerViewFastScroller.java:185)
    at android.support.v7.widget.RecyclerView.notifyOnScrolled(RecyclerView.java:3248)
    at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:2229)

I've used Eclipse since for some reason I can't import the project using Android-Studio (wrote about it here: #19 ) .

ArrayIndexOutOfBoundsException

i've got an indexOutOfBound in AbsRecyclerViewFastScroller$override.updateSectionIndicator, after tracing your code, i've seen position that came to the updateSectionIndicator is bigger than size of my list, i've add following part of code :

 if (section < 0 || section >= sections.length) {
       return;
 }

so updateSectionIndicator will be :

private void updateSectionIndicator(int position, float scrollProgress) {
        if (mSectionIndicator != null) {
            mSectionIndicator.setProgress(scrollProgress);
            if (mRecyclerView.getAdapter() instanceof SectionIndexer) {
                SectionIndexer indexer = ((SectionIndexer) mRecyclerView.getAdapter());
                int section = indexer.getSectionForPosition(position);
                Object[] sections = indexer.getSections();

                if (section < 0 || section >= sections.length) {
                    return;
                }

                mSectionIndicator.setSection(sections[section]);
            }
        }
    }

error fixed with this code, please fix this in next update. thanks for your great library.

Null Pointer Exception

This might be a small issue but I'm not able to get past this. My fragment gives a null pointer exception like- Attempt to invoke virtual method 'android.support.v7.widget.RecyclerView$LayoutManager android.support.v7.widget.RecyclerView.getLayoutManager()' on a null object reference

This is my onCreateView of the fragment -

    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    View view = inflater.inflate(R.layout.list, container, false);
    RecyclerView songRecyclerView = (RecyclerView) view.findViewById(R.id.list);
    songRecyclerView.addItemDecoration(new          BackgroundDecoration(Themes.getBackgroundElevated()));
    songRecyclerView.addItemDecoration(new DividerDecoration(getActivity()));
     int paddingH =(int) getActivity().getResources().getDimension(R.dimen.global_padding);
    view.setPadding(paddingH, 0, paddingH, 0);
    songRecyclerView.setAdapter(new Adapter());
    LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());
    layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
    songRecyclerView.setLayoutManager(layoutManager);
    VerticalRecyclerViewFastScroller fastScroller = (VerticalRecyclerViewFastScroller)  view.findViewById(R.id.fast_scroller);
    fastScroller.setRecyclerView(songRecyclerView);
    songRecyclerView.addOnScrollListener(fastScroller.getOnScrollListener());

    return view;
}

I can't figure out what is going wrong. Any ideas how to fix this minor issue?

scroll quickly down ,indicator inaccurate

when you scroll quickly down the indicator starts to show wrong data ,

Error inflating sectionindicator

android.view.InflateException:
Binary XML file line #25: Binary XML file line #25: Error inflating class xyz.danoz.recyclerviewfastscroller.sectionindicator.title.SectionTitleIndicator
....etc...
....etc...
....etc...
Caused by: android.view.InflateException: Binary XML file line #25: Error inflating class xyz.d

Does anyone know why exactly I'm getting this error?

I've imported the library correctly in gradle and it has no problem inflating / finding the "recyclerviewfastscroller.vertical.VerticalRecyclerViewFastScroller"

But it won't find the sectionindicator in the class

Incorrect values for VerticalScrollBoundsProvider (?)

it seems that method VerticalRecyclerViewFastScroller::onCreateScrollProgressCalculator take wrong values for BoundsProvider. To get scroll progress rendered correctly I overwrote VerticalRecyclerViewFastScroller::onCreateScrollProgressCalculator with the following:

VerticalScrollBoundsProvider boundsProvider = new VerticalScrollBoundsProvider(
mHandle.getHeight(), mBar.getHeight() - mBar.getY() - 2 * mHandle.getHeight()
);

instead of (which is in VerticalRecyclerViewFastScroller::onCreateScrollProgressCalculator : line 59)

new VerticalScrollBoundsProvider(
mBar.getY(), mBar.getY() + mBar.getHeight() - mHandle.getHeight()
);

Regards,
Victor

I dont know what happened. I just follow the steps and this happens

java.lang.NullPointerException
at android.support.v7.widget.RecyclerView.getChildViewHolder(RecyclerView.java:2567)
at xyz.danoz.recyclerviewfastscroller.calculation.progress.VerticalLinearLayoutManagerScrollProgressCalculator.calculateScrollProgress(VerticalLinearLayoutManagerScrollProgressCalculator.java:29)
at xyz.danoz.recyclerviewfastscroller.AbsRecyclerViewFastScroller.onLayout(AbsRecyclerViewFastScroller.java:202)
at android.view.View.layout(View.java:14905)
at android.view.ViewGroup.layout(ViewGroup.java:4601)
at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
at android.view.View.layout(View.java:14905)
at android.view.ViewGroup.layout(ViewGroup.java:4601)
at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
at android.view.View.layout(View.java:14905)
at android.view.ViewGroup.layout(ViewGroup.java:4601)
at android.support.v4.view.ViewPager.onLayout(ViewPager.java:1594)
at android.view.View.layout(View.java:14905)
at android.view.ViewGroup.layout(ViewGroup.java:4601)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1694)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1552)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1465)
at android.view.View.layout(View.java:14905)
at android.view.ViewGroup.layout(ViewGroup.java:4601)
at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
at android.view.View.layout(View.java:14905)
at android.view.ViewGroup.layout(ViewGroup.java:4601)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1694)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1552)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1465)
at android.view.View.layout(View.java:14905)
at android.view.ViewGroup.layout(ViewGroup.java:4601)
at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
at android.view.View.layout(View.java:14905)
at android.view.ViewGroup.layout(ViewGroup.java:4601)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1694)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1552)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1465)
at android.view.View.layout(View.java:14905)
at android.view.ViewGroup.layout(ViewGroup.java:4601)
at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
at android.view.View.layout(View.java:14905)
at android.view.ViewGroup.layout(ViewGroup.java:4601)
at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2213)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2027)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1237)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5162)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:791)
at android.view.Choreographer.doCallbacks(Choreographer.java:591)
at android.view.Choreographer.doFrame(Choreographer.java:561)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:777)
at android.os.Handler.handleCallback(Handler.java:725)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:176)
at android.app.ActivityThread.main(ActivityThread.java:5317)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
at dalvik.system.NativeStart.main(Native Method)

Please help.

[Request] Package as library module and present on Android Arsenal

First, I think this library is superb, because many Android developers desire fast scrolling feature for RecyclerView. However, it's not handy to use this library from other app project, and still a bit buggy for now...

I suggest that package this library as a library module and present on the Android Arsenal site as soon as possible. If this library becomes more famous, hopefully developers will contribute 😄

Request: add support to SectionIndexer and show the bubble-popup like on Lollipop's contacts app

as the title says.

Allow for readjusting height

Layouts that readjust height will leave the scroll view bounds in the original state

Make it work with CoordinatorLayout

Hi ...

Well, I'm not sure if it's an issue or my error, but I want to use CoordinatorLayout in my layout, and when using the FastScroller, it appears in the left side, instead of the right side.

<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="jahirfiquitiva.iconshowcase.activities.SearchActivity">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:elevation="@dimen/toolbar_elevation"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            app:layout_scrollFlags="scroll|enterAlways"
            app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />

    </android.support.design.widget.AppBarLayout>

    <android.support.v7.widget.RecyclerView
        android:id="@+id/searchGrid"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:clipToPadding="false"
        android:fitsSystemWindows="true"
        android:scrollbars="none"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

<xyz.danoz.recyclerviewfastscroller.vertical.VerticalRecyclerViewFastScroller
      android:id="@+id/fast_scroller"
      android:layout_width="16dp"
      android:layout_height="match_parent"
      android:layout_alignParentRight="true"
      android:layout_alignParentEnd="true"
      />

</android.support.design.widget.CoordinatorLayout>

And 2 things that I would like you to help me fix and/or for you to improve the lib.

1. RecyclerView.setOnScrollListener is deprecated.... what could be used now?
2. Make the FastScroller hide if the items are few.

Thank you.

Make scrolling quickly more responsive

It is fairly easy to get this in a state where you scroll very quickly downwards, but your finger leaves the screen before the scroll handle reaches the bottom.

Real need of Documentation & Examples

@danoz73 @h6ah4i
This really is great library, but it lacks a proper documentation. And hence adding it into the project is simple, but further it's uncharted territory moreover the issues are also not provided with answers as most of my problems are already asked.

I hope you guys update the stuff, I'll to try my best to understand the usage & update the documentation

SectionIndexer in documentations

Documentation should contain informations about SectionIndexer in Adapter for SectionIndicators.

RecyclerView.OnScrollListener does not fire when FastScroll scrolls the RecyclerView

Hey, I was hoping to fix up the performance of my list by not loading images if the Fast Scroller is active, but I can't seem to find a way to determine when that happens!

In the RecyclerView.OnScrollListener I'm using, onScrolled does fire, but it doesn't give me enough information to tell when a scroll is occurring, just when a scroll has happened. onScrollStateChanged does NOT fire with the new state when the Fast Scroller is active! It looks like this is a bug in RecyclerView itself: https://stackoverflow.com/questions/27819507/recyclerview-scrolltoposition-not-trigger-scrolllistener)

...but would there be a way to add a workaround specific to this library? Like being able to listen for when a user grabs the fast scroll handle? Or a new FastScrollListener that uses that event?

Thanks so much for this library!

Add RTL support

It would be great if this library supports RTL layout behaves like the Contacts app.

import error: Error:No such property: OSSRH_USERNAME for class: ...

I keep getting this error when trying to import the project into Android-Studio:

Error:No such property: OSSRH_USERNAME for class: org.gradle.api.publication.maven.internal.ant.DefaultGroovyMavenDeployer

What is this? How can I fix this?

Allow Section indicator to show up faster

I think the current section indicator animation is too slow especially when it shows up. The Contacts app's indicator shows up almost immediately.

It would be better if we can adjust the duration of the show / hide animations separately.

New crash new SDK an issue maybe?

I updated to the latest recyclerview and sdk and started getting the error below, but downloaded the code and seem to be getting the same error from the sample, not sure what the cause is except that there seems to be an issue with a scroll event being initiated before the "calculator" is created by the onLayout(), I made a hack to fix it by checking if it had been created before calling it and everything works fine.

03-15 21:12:59.157 3304-3304/xyz.danoz.recyclerviewfastscroller.sample E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: xyz.danoz.recyclerviewfastscroller.sample, PID: 3304
java.lang.NullPointerException: Attempt to invoke interface method 'float xyz.danoz.recyclerviewfastscroller.calculation.progress.TouchableScrollProgressCalculator.calculateScrollProgress(android.support.v7.widget.RecyclerView)' on a null object reference
at xyz.danoz.recyclerviewfastscroller.AbsRecyclerViewFastScroller$1.onScrolled(AbsRecyclerViewFastScroller.java:185)
at android.support.v7.widget.RecyclerView.notifyOnScrolled(RecyclerView.java:3248)
at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:2229)
at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:2415)
at android.view.View.layout(View.java:15596)
at android.view.ViewGroup.layout(ViewGroup.java:4966)

Support Standard SectionIndexer

Support of Android's standard SectionIndexer would allow existing code to be easily migrated to use the RecyclerView and RecyclerViewFastScroller.

Update readme with recyclerView adapter information

If recyclerview adapter does not implement android.widget.SectionIndexer then title indicator won't work.

calculateScrollProgress produces divide by zero Exception when at least one of recycler's child has "GONE" visibility

The title pretty explains it.

java.lang.ArithmeticException: divide by zero
    at  xyz.danoz.recyclerviewfastscroller.calculation.progress.VerticalLinearLayoutManagerScrollProgressCalculator.calculateScrollProgress(VerticalLinearLayoutManagerScrollProgressCalculator.java:32)
    at xyz.danoz.recyclerviewfastscroller.AbsRecyclerViewFastScroller.onLayout(AbsRecyclerViewFastScroller.java:202)

FastScrollerTouchListener ACTION_CANCEL

the FastScrollerTouchListener doesn't manage the ACTION_CANCEL event as a discard event.

If the VerticalRecyclerViewFastScroller is inside a ViewPager, a swipe started on the view will first show the SectionTitleIndicator and then leave it visible when the ViewPager starts to swipe the page.

https://github.com/danoz73/RecyclerViewFastScroller/blob/master/recyclerviewfastscroller/src/main/java/xyz/danoz/recyclerviewfastscroller/FastScrollerTouchListener.java#L35

it does not support auto hide when user stop scrolling?

Handle position not preserved on screen rotation

Hi. I noticed the example app has a small problem with screen rotation. After screen rotated, the RecyclerView contents keep scrolled position but the fast scroller handle position is reset to the top of the screen.

Scroll direction is not natural

How do we reverse it?

I've already tried the following but it's not working

// ...
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getActivity());
        linearLayoutManager.setReverseLayout(true);
        linearLayoutManager.setStackFromEnd(true);

        recyclerView.setLayoutManager(linearLayoutManager);
// ...

Not working with view pager fragments

doesn't work with SwipeRefreshLayout

When I put RecyclerViewFastScroller inside android.support.v4.widget.SwipeRefreshLayout, I find RecyclerViewFastScroller disappear. Does anyone have the same issue as mine?

can't see indicator because it is hidden by finger when scrolling...

I am using GridLayoutManager, when i scroll down one item out of four visible grid items (bottom right ) is moved further down

Cannot display the "fastscroll", app is crashing

I'm trying to implements the FastScroller component but it didn't work because of a NullPointerException, below the stackStrace :

java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.ViewParent android.view.View.getParent()' on a null object reference
at android.support.v7.widget.RecyclerView.getChildViewHolder(RecyclerView.java:2567)
at xyz.danoz.recyclerviewfastscroller.calculation.progress.VerticalLinearLayoutManagerScrollProgressCalculator.calculateScrollProgress(VerticalLinearLayoutManagerScrollProgressCalculator.java:29)
at xyz.danoz.recyclerviewfastscroller.AbsRecyclerViewFastScroller.onLayout(AbsRecyclerViewFastScroller.java:202)
at android.view.View.layout(View.java:15596)
at android.view.ViewGroup.layout(ViewGroup.java:4966)
at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1076)
at android.view.View.layout(View.java:15596)
at android.view.ViewGroup.layout(ViewGroup.java:4966)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
at android.widget.FrameLayout.onLayout(FrameLayout.java:508)
at android.view.View.layout(View.java:15596)
at android.view.ViewGroup.layout(ViewGroup.java:4966)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
at android.widget.FrameLayout.onLayout(FrameLayout.java:508)
at android.view.View.layout(View.java:15596)
at android.view.ViewGroup.layout(ViewGroup.java:4966)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1703)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1557)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1466)
at android.view.View.layout(View.java:15596)
at android.view.ViewGroup.layout(ViewGroup.java:4966)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
at android.widget.FrameLayout.onLayout(FrameLayout.java:508)
at android.view.View.layout(View.java:15596)
at android.view.ViewGroup.layout(ViewGroup.java:4966)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
at android.widget.FrameLayout.onLayout(FrameLayout.java:508)
at android.view.View.layout(View.java:15596)
at android.view.ViewGroup.layout(ViewGroup.java:4966)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
at android.widget.FrameLayout.onLayout(FrameLayout.java:508)
at android.view.View.layout(View.java:15596)
at android.view.ViewGroup.layout(ViewGroup.java:4966)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
at android.widget.FrameLayout.onLayout(FrameLayout.java:508)
at android.view.View.layout(View.java:15596)
at android.view.ViewGroup.layout(ViewGroup.java:4966)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
at android.widget.FrameLayout.onLayout(FrameLayout.java:508)
at android.view.View.layout(View.java:15596)
at android.view.ViewGroup.layout(ViewGroup.java:4966)
at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2072)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1829)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1054)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5779)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
at android.view.Choreographer.doCallbacks(Choreographer.java:580)
at android.view.Choreographer.doFrame(Choreographer.java:550)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)

Any solution ?

Section indicator is not aligned to center of the handle

See the attached screen shots. The section indicator is not aligned to the center of the handle.

java.lang.NoClassDefFoundError: Failed resolution of: Lxyz/danoz/recyclerviewfastscroller/R$styleable;

I got this error when using this library:

05-27 00:09:02.547: E/AndroidRuntime(3145): java.lang.NoClassDefFoundError: Failed resolution of: Lxyz/danoz/recyclerviewfastscroller/R$styleable;

Here is my layout:

<android.support.v7.widget.RecyclerView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/rv_list_events"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior" />

<xyz.danoz.recyclerviewfastscroller.vertical.VerticalRecyclerViewFastScroller
  android:id="@+id/fast_scroller"
  android:layout_width="100dp"
  android:layout_height="match_parent"
  />

Scroll bar appears at the bottom when number of items less

If the recyclerview has less items (say 2 items) , the scroller still shows with its position at the bottom. Tried with your example too . Same results . Ideally the scroller should show only when no of items in recyclerview > last visible position . Can you tell me how to solve this?

Please add prefix when declare attributes

When using this library with FancyButton,
as you may know it will show me the error that attribute already been defined...

so, the good habit when define an attribute is adding a unique prefix.

Support older devices (min API level = 9)

Hi. I want to use this library in my product, but the product have to support API 9 or later.

I've already forked this library and modified to work with gingerbread devices. (Not PR yet, because this modification requires other PR have to be merged before)
https://github.com/h6ah4i/RecyclerViewFastScroller/tree/support_api_level_9