twotoasters / jazzylistview

JazzyListView

JazzyListView is an extension of ListView designed to animate list item views as they become visible. There are a number of pre-built, bundled effects that can be used by setting the effect in code or an XML layout attribute. Also, it is possible to use a custom effect by implementing a JazzyEffect.

This project was inspired by stroll.js.

Usage

ListView

1. Include a JazzyListView in your layout

<com.twotoasters.jazzylistview.JazzyListView
    android:id="@+id/list"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"/>

2. Get a reference to your JazzyListView

JazzyListView list = (JazzyListView) findViewById(R.id.list);

3. Set your effect

list.setTransitionEffect(new SlideInEffect());

RecyclerView

1. Include a JazzyListView in your layout

<android.support.v7.widget.RecyclerView
    android:id="@+id/list"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

2. Get a reference to your RecyclerView

RecyclerView recyclerView = (RecyclerView) findViewById(R.id.list);

3. Set the JazzyScrollListener (you can set an additional scroll listener on the JazzyScrollListener)

recyclerView.setOnScrollListener(new JazzyRecyclerViewScrollListener());

4. Set your effect

recyclerView.setTransitionEffect(new SlideInEffect());

Sample App

The sample app demonstrates all of the pre-built effects on a list, grid, and recyclerview. You can build it from source or install it from the Play Store.

Download

compile 'com.twotoasters.jazzylistview:library:1.2.1'
compile 'com.twotoasters.jazzylistview:library-recyclerview:1.2.1'

License

Copyright 2015 Two Toasters

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

jazzylistview's Issues

Could not find property 'BINTRAY_USER'

Could not find property 'BINTRAY_USER' on com.jfrog.bintray.gradle.BintrayExtension_Decorated@3c9c63d1.

java.lang.NullPointerException

  JazzyRecyclerViewScrollListener scrollListener = new JazzyRecyclerViewScrollListener();
    scrollListener.setTransitionEffect(JazzyHelper.SLIDE_IN);
    mRecyclerView.addOnScrollListener(scrollListener);

if RecyclerView scroll not smooth(means got stuck)

java.lang.NullPointerException
Attempt to invoke virtual method 'android.view.ViewPropertyAnimator android.view.View.animate()' on a null object reference
com.twotoasters.jazzylistview.JazzyHelper.doJazzinessImpl(JazzyHelper.java:197)
com.twotoasters.jazzylistview.JazzyHelper.doJazziness(JazzyHelper.java:189)
com.twotoasters.jazzylistview.JazzyHelper.onScrolled(JazzyHelper.java:115)
com.twotoasters.jazzylistview.recyclerview.JazzyRecyclerViewScrollListener.onScrolled(JazzyRecyclerViewScrollListener.java:24)
android.support.v7.widget.RecyclerView.dispatchOnScrolled(RecyclerView.java:3634)
android.support.v7.widget.RecyclerView$ViewFlinger.run(RecyclerView.java:3806)
android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
android.view.Choreographer.doCallbacks(Choreographer.java:580)
android.view.Choreographer.doFrame(Choreographer.java:549)
android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)
android.os.Handler.handleCallback(Handler.java:739)
android.os.Handler.dispatchMessage(Handler.java:95)
android.os.Looper.loop(Looper.java:135)
android.app.ActivityThread.main(ActivityThread.java:5254)
java.lang.reflect.Method.invoke(Native Method)
java.lang.reflect.Method.invoke(Method.java:372)
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

Still Error

Hi..
I still got the error when try to use your app in Android Studio.
What should I do. Please tell me the easiest way..

Quickly slide the list anr~~~

Quickly slide the list anr~~~

NullPointerException on play console

java.lang.NullPointerException:
at com.twotoasters.jazzylistview.b.b (Unknown Source)
at com.twotoasters.jazzylistview.b.a (Unknown Source:65)
at com.twotoasters.jazzylistview.b.a (Unknown Source:37)
at com.twotoasters.jazzylistview.b.onScroll (Unknown Source)
at android.widget.AbsListView.invokeOnItemScrollListener (AbsListView.java:2168)
at android.widget.ListView.layoutChildren (ListView.java:2103)
at android.widget.AbsListView.onLayout (AbsListView.java:2952)
at android.view.View.layout (View.java:20964)
at android.view.ViewGroup.layout (ViewGroup.java:6440)
at android.widget.LinearLayout.setChildFrame (LinearLayout.java:1791)
at android.widget.LinearLayout.layoutHorizontal (LinearLayout.java:1780)
at android.widget.LinearLayout.onLayout (LinearLayout.java:1546)
at android.view.View.layout (View.java:20964)
at android.view.ViewGroup.layout (ViewGroup.java:6440)
at android.support.v4.view.ViewPager.onLayout (Unknown Source:261)
at android.view.View.layout (View.java:20964)
at android.view.ViewGroup.layout (ViewGroup.java:6440)
at android.support.design.widget.f.b (Unknown Source:135)
at android.support.design.widget.m.a (Unknown Source)
at android.support.design.widget.AppBarLayout$ScrollingViewBehavior.a (Unknown Source)
at android.support.design.widget.CoordinatorLayout.onLayout (Unknown Source:42)
at android.view.View.layout (View.java:20964)
at android.view.ViewGroup.layout (ViewGroup.java:6440)
at android.widget.LinearLayout.setChildFrame (LinearLayout.java:1791)
at android.widget.LinearLayout.layoutVertical (LinearLayout.java:1635)
at android.widget.LinearLayout.onLayout (LinearLayout.java:1544)
at android.view.View.layout (View.java:20964)
at android.view.ViewGroup.layout (ViewGroup.java:6440)
at android.support.v4.widget.DrawerLayout.onLayout (Unknown Source:59)
at android.view.View.layout (View.java:20964)
at android.view.ViewGroup.layout (ViewGroup.java:6440)
at android.widget.FrameLayout.layoutChildren (FrameLayout.java:323)
at android.widget.FrameLayout.onLayout (FrameLayout.java:261)
at android.view.View.layout (View.java:20964)
at android.view.ViewGroup.layout (ViewGroup.java:6440)
at android.widget.LinearLayout.setChildFrame (LinearLayout.java:1791)
at android.widget.LinearLayout.layoutVertical (LinearLayout.java:1635)
at android.widget.LinearLayout.onLayout (LinearLayout.java:1544)
at android.view.View.layout (View.java:20964)
at android.view.ViewGroup.layout (ViewGroup.java:6440)
at android.widget.FrameLayout.layoutChildren (FrameLayout.java:323)
at android.widget.FrameLayout.onLayout (FrameLayout.java:261)
at android.view.View.layout (View.java:20964)
at android.view.ViewGroup.layout (ViewGroup.java:6440)
at android.widget.LinearLayout.setChildFrame (LinearLayout.java:1791)
at android.widget.LinearLayout.layoutVertical (LinearLayout.java:1635)
at android.widget.LinearLayout.onLayout (LinearLayout.java:1544)
at android.view.View.layout (View.java:20964)
at android.view.ViewGroup.layout (ViewGroup.java:6440)
at android.widget.FrameLayout.layoutChildren (FrameLayout.java:323)
at android.widget.FrameLayout.onLayout (FrameLayout.java:261)
at com.android.internal.policy.DecorView.onLayout (DecorView.java:955)
at android.view.View.layout (View.java:20964)
at android.view.ViewGroup.layout (ViewGroup.java:6440)
at android.view.ViewRootImpl.performLayout (ViewRootImpl.java:3027)
at android.view.ViewRootImpl.performTraversals (ViewRootImpl.java:2714)
at android.view.ViewRootImpl.doTraversal (ViewRootImpl.java:1843)
at android.view.ViewRootImpl$TraversalRunnable.run (ViewRootImpl.java:7978)
at android.view.Choreographer$CallbackRecord.run (Choreographer.java:911)
at android.view.Choreographer.doCallbacks (Choreographer.java:723)
at android.view.Choreographer.doFrame (Choreographer.java:658)
at android.view.Choreographer$FrameDisplayEventReceiver.run (Choreographer.java:897)
at android.os.Handler.handleCallback (Handler.java:790)
at android.os.Handler.dispatchMessage (Handler.java:99)
at android.os.Looper.loop (Looper.java:164)
at android.app.ActivityThread.main (ActivityThread.java:7000)
at java.lang.reflect.Method.invoke (Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:441)
at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1408)

I have no idea how to use your library into my project

I got this error when I was trying to use your 'library' module.

So, would you like to tell me the easiest tutorial how to do it.
Please, I'm begging on you..

It Doesn't Provide Any Support to show ListFragments

It Doesn't Provide Any Support to show List Fragments..

optional bottom loading bar

is that possible to add a bottom loading bar?

Using Jazzy animations without NineOldAndroid dependency

Hi,

Thanks for your excellent library but Can you remove the dependency on NineOldAndroid.jar

I wanna use this library on android 4.0 above & that's why I don't wanna use the NineOldAndroid.jar dependency.

Duration and pull down direction of animation

I want to customize the duration of the animation and see the animation only pull down list.

Give me an example.

Thanks

Add compatibility with android.support.v4.app?

Trying to compile a project with both the mentioned and this library causes a fatal exception due to what I believe is a conflict on the definition of android.support.v4.accessibilityservice.AccessibilityServiceInfoCompat$AccessibilityServiceInfoVersionImpl.

problem with setAdapter

i have a RecyclerView.Adapter class. and i want cast it to ListAdapter
but (returns error (Can not cast))

public void setAdapter() {
    RecyclerAdapter adapter = new RecyclerAdapter(context);
    cv.setAdapter((ListAdapter) adapter);
}

please help !

setVerticalScrollBarEnabled(true) causes null pointer exception

The constructor originally looks like:

    public JazzyListView(Context context) {
        this(context, null);
    }

    public JazzyListView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public JazzyListView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);

        mHelper = new JazzyHelper(context, attrs);
        super.setOnScrollListener(mHelper);
    }

Maybe it should be like this:

    public JazzyListView(Context context) {
        super(context);
        mHelper = new JazzyHelper(context, null);
        super.setOnScrollListener(mHelper);
    }

    public JazzyListView(Context context, AttributeSet attrs) {
        super(context, attrs);
        mHelper = new JazzyHelper(context, attrs);
        super.setOnScrollListener(mHelper);
    }

    public JazzyListView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);

        mHelper = new JazzyHelper(context, attrs);
        super.setOnScrollListener(mHelper);
    }

It seems that you passed 0 to the defStyle causes this problem

Problem with fast scrolling

I am using JazzyListView with a SLIDE_IN effect and I have fast scrolling enabled in my ListView. When I fast scroll it does not work quite right because the first visible item is many times not visible. Could it be somehow possible to disable the animation when fast scrolling and re-enable it once we stop?

Thanks

M

Just a suggestion!

Hi
Thank you for your great library! 👍 this is the best ListView and RecyclerView animation library on the plant! :)

You can make it even better by adding:

• StickyListHeaders. (For RecyclerView)
• appearance animation.

NPE when using footer as page loading indicator

I use ListView footer to indicate page loading, when loading next page, I scroll up and down again and again, after adapter notify, it throws NPE. you can see the issue in my fork SimpleListWithHeadersAndFootersActivity

Jazzy List View with Recycler View

this works

recyclerView.setAdapter(adapter);
JazzyRecyclerViewScrollListener listener = new JazzyRecyclerViewScrollListener();
listener.setTransitionEffect(new SlideInEffect());
recyclerView.setOnScrollListener(listener);

this does not from the readme

recyclerView.setTransitionEffect(new SlideInEffect());

How to play anim only once?

I want to play animation only once, for example when scroll listview down, the anim is played (card, curl...). But I don't want anim play again when I scroll up.

Animation rendering artifacts

On Nexus 5 stock (4.4.3) the animation are sometimes overlapped by black diagonal stripes, sometimes the rows are dotted-transparent. only during animations

How can i apply pulltorefresh for the JazzyListView library.

Hi,
I need to apply pulltorefresh and as well JazzyListView animation to the listview . how can i apply.

problem with FastScroller

returns

java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.ViewPropertyAnimator android.view.View.animate()' on a null object reference

And Force Close
when i use FastScroll

NullPointerException in using RecyclerView

java.lang.NullPointerException:
at com.twotoasters.jazzylistview.JazzyHelper.doJazzinessImpl (JazzyHelper.java:197)
at com.twotoasters.jazzylistview.JazzyHelper.doJazziness (JazzyHelper.java:189)
at com.twotoasters.jazzylistview.JazzyHelper.onScrolled (JazzyHelper.java:122)
at com.twotoasters.jazzylistview.recyclerview.JazzyRecyclerViewScrollListener.onScrolled (JazzyRecyclerViewScrollListener.java:24)

Supporting ExpandableListView

Hi,

I was trying to include the Jazzy effect in a ExpandableListView. I just took the code from the JazzyListView but I extended from ExpandableListView instead of ListView
package com.twotoasters.jazzylistview;

import android.content.Context;
import android.util.AttributeSet;
import android.widget.ExpandableListView;

public class JazzyExpandableListView extends ExpandableListView {

private final JazzyHelper mHelper;

public JazzyExpandableListView(Context context) {
    super(context);
    mHelper = init(context, null);
}

public JazzyExpandableListView(Context context, AttributeSet attrs) {
    super(context, attrs);
    mHelper = init(context, attrs);
}

public JazzyExpandableListView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    mHelper = init(context, attrs);
}

private JazzyHelper init(Context context, AttributeSet attrs) {
    JazzyHelper helper = new JazzyHelper(context, attrs);
    super.setOnScrollListener(helper);
    return helper;
}

@Override
public final void setOnScrollListener(OnScrollListener l) {
    mHelper.setOnScrollListener(l);
}

/**
 * Sets the desired transition effect.
 *
 * @param transitionEffect Numeric constant representing a bundled transition effect.
 */
public void setTransitionEffect(int transitionEffect) {
    mHelper.setTransitionEffect(transitionEffect);
}

/**
 * Sets the desired transition effect.
 *
 * @param transitionEffect The non-bundled transition provided by the client.
 */
public void setTransitionEffect(JazzyEffect transitionEffect) {
    mHelper.setTransitionEffect(transitionEffect);
}

/**
 * Sets whether new items or all items should be animated when they become visible.
 *
 * @param onlyAnimateNew True if only new items should be animated; false otherwise.
 */
public void setShouldOnlyAnimateNewItems(boolean onlyAnimateNew) {
    mHelper.setShouldOnlyAnimateNewItems(onlyAnimateNew);
}

/**
 * If true animation will only occur when scrolling without the users finger on the screen.
 *
 * @param onlyFlingEvents
 */
public void setShouldOnlyAnimateFling(boolean onlyFling) {
    mHelper.setShouldOnlyAnimateFling(onlyFling);
}

/**
 * Stop animations after the list has reached a certain velocity. When the list slows down
 * it will start animating again. This gives a performance boost as well as preventing
 * the list from animating under the users finger if they suddenly stop it.
 *
 * @param itemsPerSecond, set to JazzyHelper.MAX_VELOCITY_OFF to turn off max velocity.
 *        While 13 is a good default, it is dependent on the size of your items.
 */
public void setMaxAnimationVelocity(int itemsPerSecond) {
    mHelper.setMaxAnimationVelocity(itemsPerSecond);
}

/**
 * Enable this if you are using a list with items that should act like grid items.
 *
 * @param simulateGridWithList
 */
public void setSimulateGridWithList(boolean simulateGridWithList) {
    mHelper.setSimulateGridWithList(simulateGridWithList);
    setClipChildren(!simulateGridWithList);
}

}
My problem is that when I enable fast scrolling I get aq NullPointerException

java.lang.NullPointerException
E/AndroidRuntime(20260): at com.nineoldandroids.view.ViewPropertyAnimatorICS.(ViewPropertyAnimatorICS.java:22)
E/AndroidRuntime(20260): at com.nineoldandroids.view.ViewPropertyAnimator.animate(ViewPropertyAnimator.java:62)
E/AndroidRuntime(20260): at com.twotoasters.jazzylistview.JazzyHelper.doJazzinessImpl(JazzyHelper.java:196)

i tried putting an additional check in the JazzyHelper to check if the element is null, but when I do that, it does not look quite right because the first and last visible elements sometimes disappear.

Is there anything I could do to make this work?

not scroll in android APi 17 and mdpi resolution

I have a list that have automatic scroll in api 19 and above, but in api 17 there is not a scroll

jazzylistview integrated with android.support.design.widget.CoordinatorLayout

The behaviour of jazzylistview with CoordinatorLayout, isn't the same as normal reclycerview

the toolbar with appbarlayput doesn't move up

Footer not working?

I'm using JazzyListView with DobList. Apart from the following, I'm really happy with this combination.
For some reasons, DobLists loading footer doesn't appear at all.
The footer is added correctly by DobList (ListView.getFooterViewsCount() is increased by one after adding it).
It's set to be visible from the start of requesting more products to the time when the results arrive.
But it doesn't appear at all.
Could this be a bug in JazzyListView?

how to stop animation effect on listview scroll ?

how to stop animation effect on listview scroll ?
i want animation only on first time list loading.

Customize animation duration

600 ms is too long and not really standard in other animations which are usually 200-300ms. It should be customizable. Since duration is in the JazzyHelper class I don't really know where the best place to make the modification would be, but making it not final would be a start. As of now I'll just have to include the library source manually.

How to install this library into my project?

Hi twotoasters..

I just knew your awesome library (JazzyListView) from "Libraries for developers" application I downloaded on Play Store.
Therefore I want to install it in my project. But I don't understand how to do that.
So, could you tell me how to install your library into my application's project?
Details explanation would be nice for me. Sorry for this, because I'm still newbie.

That's all I want to know.
Your answers will be expected.

i found this error during the scroll

This bug is not occur often but only when the list goes really long and fast.

03-02 18:17:32.403  15537-15537/com.buildsystemexample.app.test_native E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: com.buildsystemexample.app.test_native, PID: 15537
    java.lang.NullPointerException
            at com.nineoldandroids.view.ViewPropertyAnimatorICS.<init>(ViewPropertyAnimatorICS.java:22)
            at com.nineoldandroids.view.ViewPropertyAnimator.animate(ViewPropertyAnimator.java:62)
            at com.twotoasters.jazzylistview.JazzyHelper.doJazzinessImpl(JazzyHelper.java:195)
            at com.twotoasters.jazzylistview.JazzyHelper.doJazziness(JazzyHelper.java:187)
            at com.twotoasters.jazzylistview.JazzyHelper.onScroll(JazzyHelper.java:103)
            at android.widget.AbsListView.invokeOnItemScrollListener(AbsListView.java:1417)
            at android.widget.GridView.layoutChildren(GridView.java:1305)
            at android.widget.AbsListView$FlingRunnable.run(AbsListView.java:4209)
            at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
            at android.view.Choreographer.doCallbacks(Choreographer.java:574)
            at android.view.Choreographer.doFrame(Choreographer.java:543)
            at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
            at android.os.Handler.handleCallback(Handler.java:733)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5146)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:732)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:566)
            at dalvik.system.NativeStart.main(Native Method)

Can you put the .jar please?

Can you put the .jar please?

NullPointerException in RecyclerView

JazzyHelper throws Null Pointer Exception while scroll very (very) fast (only on recyclerview)

NullPointerException
System.err:  at jazzylistview.JazzyHelper.doJazzinessImpl(JazzyHelper.java:204)
System.err:  at jazzylistview.JazzyHelper.doJazziness(JazzyHelper.java:195)
System.err:  at jazzylistview.JazzyHelper.onScrolled(JazzyHelper.java:121)
System.err:  at jazzylistview.JazzyRecyclerViewScrollListener.onScrolled(JazzyRecyclerViewScrollListener.java:37)

V23 issue

recyclerView.setTransitionEffect(new SlideInEffect());

this one does not work in V23

Error: Ambient Vertex Buffer overflow!!!

Hi,

I'm using this library to add animations on grid in my app, but I got this error:

A/OpenGLRenderer﹕ Error: Ambient Vertex Buffer overflow!!! used 463, total 284
A/libc﹕ Fatal signal 6 (SIGABRT), code -6 in tid 27814 (hwuiTask1)

Can you help me on this?
This is occurred only on Android Lollipop 5.1
I tested on pre-Lollipop Android versions without problems.

UPDATE: I got this problem only with some type of animations, like "Twirl" and "Cards".

Thanks!

doJazzinessImpl NPE

On 1.21 using recycler view
at com.twotoasters.jazzylistview.JazzyHelper.doJazzinessImpl(JazzyHelper.java:197)
at com.twotoasters.jazzylistview.JazzyHelper.doJazziness(JazzyHelper.java:189)
at com.twotoasters.jazzylistview.JazzyHelper.onScrolled(JazzyHelper.java:115)
at com.twotoasters.jazzylistview.recyclerview.JazzyRecyclerViewScrollListener.onScrolled(JazzyRecyclerViewScrollListener.java:24)
at android.support.v7.widget.RecyclerView$ViewFlinger.run(RecyclerView.java:2872)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
at android.view.Choreographer.doCallbacks(Choreographer.java:580)
at android.view.Choreographer.doFrame(Choreographer.java:549)
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)

particularly
private void doJazzinessImpl(View item, int position, int scrollDirection) {
ViewPropertyAnimator animator = item.animate().setDuration(600L).setInterpolator(new AccelerateDecelerateInterpolator());
scrollDirection = scrollDirection > 0?1:-1;
this.mTransitionEffect.initView(item, position, scrollDirection);
this.mTransitionEffect.setupAnimation(item, position, scrollDirection, animator);
animator.start();
}

item is null. This happens pretty rarely. Basically what happens is I'm selecting a list of users on the left side of a sliding pane layout and clearing then adding to then notifyingdataSetChanged on a jazzylistview on the right side of the sliding pane layout. It may have something to do with there being two different view types in my listview, but I'm not sure. It seems like sometimes in onScrolled

        for(i = 0; firstVisibleItem + i < this.mFirstVisibleItem; ++i) {
            View indexBeforeLast = viewGroup.getChildAt(i);
            this.doJazziness(indexBeforeLast, firstVisibleItem + i, -1);
        }

indexBeforeLast is returning null.

Unless there is something wrong with the arithmetic to iterate through visible views my instinct is just to abort in doJazzinessImpl if item is null

clickListener doesn't work in Android O

the action click is not throw in Android O

Sample crashes on scroll on Samsung GS3

The problem: Sample app crashes on first scroll.
To recreate:
Download JLV from github.
Download the referenced 9 old androids jarfile
Build in Eclipse
Run on GS3