yarolegovich / discretescrollview Goto Github PK

A scrollable list of items that centers the current element and provides easy-to-use APIs for cool item animations.

Java 100.00%

android view discrete-scroll item-picker recyclerviewpager carousel android-development android-ui android-library swipe

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discretescrollview's Issues

How to reduce the spacing between view-in-focus and view in background in horizontal mode?

Hello,

I'm trying to emulate something which looks like the shop cards demo in your sample app. However, I'm trying to reduce the spacing between the view which is expanded and the view which is in the background. How can I do this?

Btw, thanks for building this nice library.

Delete item error

When i want to delete recyclerview item，it cannot work correct.
i delete the last item,an call notifyDataSetChanged method，and the recyclerview show incorrectly;all items scroll to the right of the center.
but when i delete other position items，it work well.

Vertical Scroll

Can you add vertical scroll support or How can I do?

Fast Scroll

Hello.
I want to ask you if is possible to implement fast scroll over items? when user swipe to change position not only pre/next slide. Can you please guide me how is possible to implement for your ScrollView.

Horizontal scrolling within ViewPager fragment not working correctly

Hi,

I have a ViewPager set up with 3 fragments. The 3rd fragment, contains a relativeLayout with the DiscreteScrollView located in the lower half.

The general implementation works fine, displays correctly, transforms etc. However, when it comes to scrolling, if you try a quick "fling" type scroll, it does not register on the DiscreteScrollView, instead, the ViewPager takes the touch event. If you however, hold your finger over an item in the DiscreteScrollView for a split second or more, and then attempt to scroll, it works fine. This also occurs if you very casually or "slowly" attempt to scroll (possibly due to the split-second extra contact over the DiscreteScrollView,allowing the touch to be registered for the DiscreteScrollView instead of the ViewPager). Furthermore, if you initially scroll up or down to initial the contact - without lifting your finger - and then scrolling horizontally, it also works every time.

I have tested this on various devices with the same result. I believe there's a problem with the initial touch registration for the DiscreteScrollView. Could this be a problem with the internal LayoutManager and how it handles scrolls?

As previously, we had a standard recyclerView in the exact same location and setup and it handled the scrolling flawlessly as would be expected for such a trivial aspect.

We have tried various properties, enabling and disabling NestedScrolling, various layout formats (such as using NestedScrollViews), nothing made any difference at all.

Any help or insight into this at all would be greatly appreciated!

Infinite Circular Scroll

Hi,
How can we support Infinite Circular in this view?

PS: Thanks for this awesome library.

InfiniteScrollAdapter incorrect position detection

InfiniteScrollAdapter does pick up the position if there are only three items in the adapter. Using get real position from the adapter.

1.3.0 gradle defeated

Error:Failed to resolve: com.android.support:appcompat-v7:26.0.0

How to decrease the space between items?

Hey. I must say that this is a very interesting library. Good work guys. But i am having hard time to decrease the space between recycler items. I want to decrease the space please look at this below image.

What i have tried so far is below.
This is the item decorator.

` public class RecyclerItemDecorator extends RecyclerView.ItemDecoration {

@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
    outRect.left = 0;
    outRect.right = 0;
    outRect.top = 0;
    outRect.bottom = 0;
    //super.getItemOffsets(outRect, view, parent, state);
}
}

`
Here is the java code from activity

binding.rcTest.addItemDecoration(new RecyclerItemDecorator());

Sliding direction

Hi, Your project is sliding from the left to the right, I want to change from the right to the left slide, can you tell me how to do it? And I do not want to use DiscreteScrollView.scrollToPostion () this method to directly display the last one of the data, and then slide from the right to achieve this. Can you help me?

How to dynamically control item width

I want to get the screen width -10dp as the width of item,
I tried doing it in onCreateViewHolder:
viewHolder= new viewHolder(_inflate);
ViewGroup.LayoutParams _layoutParams = viewHolder.mCardView.getLayoutParams();
layoutParams.width=_layoutParams.width-10;
viewHolder.mCardView.setLayoutParams(_layoutParams);
But it doesn't work.

Scrolling Behaviour a little bit disrupted , jerky inside Coordinator layout.

It doesn't influence the Collapse Modes of App Bar. Maybe touches are not being forwarded?

Implemented example as:

 List<Item> datsa = new ArrayList<>();
        datsa = Arrays.asList(
                new Item(1, "Everyday Candle", "$12.00 USD", "https://unsplash.it/200/200?image=23"),
                new Item(2, "Small Porcelain Bowl", "$50.00 USD", "https://unsplash.it/200/200?image=56"),
                new Item(3, "Favourite Board", "$265.00 USD", "https://unsplash.it/200/200?image=998"),
                new Item(3, "Favourite Board", "$265.00 USD", "https://unsplash.it/200/200?image=776"),
                new Item(3, "Favourite Board", "$265.00 USD", "https://unsplash.it/200/200?image=687"));

        discreteScrollView.setItemTransformer(new ScaleTransformer.Builder()
                .setMaxScale(1.05f)
                .setMinScale(0.8f)
                .setPivotX(Pivot.X.CENTER) // CENTER is a default one
                .setPivotY(Pivot.Y.BOTTOM) // CENTER is a default one
                .build());

        discreteScrollView.setAdapter(new ItemAdapter(datsa));

<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:id="@+id/main_content"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_alignParentTop="true"
    android:fitsSystemWindows="true">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="280dp"
        android:elevation="4dp">

        <android.support.design.widget.CollapsingToolbarLayout
            android:id="@+id/collapsing_toolbar"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layout_scrollFlags="scroll|exitUntilCollapsed|snap"
            app:title="@null"
            app:titleTextAppearance="@style/Toolbar.TitleText">

            <ImageView
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:fitsSystemWindows="true"
                android:scaleType="centerCrop"
                app:layout_collapseMode="parallax" />

            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                app:layout_collapseMode="pin"
                app:layout_scrollFlags="scroll|enterAlways"
                app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
                app:subtitleTextColor="@color/white"
                app:theme="@style/AppTheme.ToolbarStyle"
                app:title="@null"
                app:titleTextAppearance="@style/Toolbar.TitleText"
                app:titleTextColor="@color/white" />

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

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

    <android.support.v4.widget.NestedScrollView
        android:id="@+id/scrolling_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        app:layout_behavior="@string/appbar_scrolling_view_behavior">

        <LinearLayout
   
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">

            <TextView
                style="@style/TextStyle.Title"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginBottom="4dp"
                android:layout_marginLeft="16dp"
                android:layout_marginRight="16dp"
                android:layout_marginTop="16dp"
                android:textSize="32sp" />

            <TextView
                style="@style/TextStyle.Title"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="16dp"
                android:layout_marginRight="16dp"
                android:fontFamily="sans-serif-light" />

            <TextView
              
                style="@style/TextStyle.Title.Sub"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="16dp"
                android:layout_marginRight="16dp"
                android:fontFamily="sans-serif-light" />

                <com.yarolegovich.discretescrollview.DiscreteScrollView
                    android:id="@+id/item_picker"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content" />

            <TextView
                style="@style/TextStyle"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center|top"
                android:layout_marginTop="8dp"
                android:text=" DESCRIPTION" />

            <android.support.v7.widget.CardView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_margin="@dimen/card_margin"
                app:cardBackgroundColor="@android:color/white"
                app:cardElevation="2dp"
                app:contentPadding="4dp">


                <TextView
                    style="@style/TextStyle"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="8dp"
                    android:fontFamily="sans-serif-light"
                    android:lineSpacingMultiplier="1.2" />
            </android.support.v7.widget.CardView>




         
        </LinearLayout>


    </android.support.v4.widget.NestedScrollView>

    <android.support.design.widget.FloatingActionButton
     
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_margin="16dp"
        app:elevation="6dp"
        app:fabSize="normal"
        app:layout_anchor="@id/scrolling_container"
        app:layout_anchorGravity="bottom|right|end"
        app:pressedTranslationZ="8dp"
        app:rippleColor="@android:color/white" />

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

How can i add loading more and paging? thank you!

Typo/Bug in ScaleTransformer.Builder

ScaleTransformer.Builder.setMaxScale changes ScaleTransformer.maxMinDiff field:

public Builder setMaxScale(@FloatRange(from = 0.01) float scale) {
       transformer.maxMinDiff = scale;
       return this;
}

but should change ScaleTransformer.maxScale, because ScaleTransformer.maxMinDiff would be calculated on the base of maxScale and minScale:

public ScaleTransformer build() {
        transformer.maxMinDiff = transformer.maxScale - transformer.minScale;
        return transformer;
}

DiscreteScrollLayoutManager is package private

I spotted that if I want create my own LayoutManager, I have to extend DiscreteScrollLayoutManager and this is reasonable, but I saw that this class is package private, so I can't extend it. Is this intended?

how to set the first item be aligned left

the first item is centered default,and how to set align left

Can not give dynamic height to items

Hello, I am in a great problem ..I am using your library for showing images. There are different types of images some are portrait some are landscape but I have tried every possibility but I am unable to give dynamic height. i tried in onCreateViewHolder and in onBindViewHolder .Please help

How to scroll through more than one item?

Now I can only scroll through one item at a time, then it stops scrolling. Is there any way to scroll through multiple items at one scrolling? I call this method smoothScrollToPosition() when users tap on a item to achieve this. But when users slide left or right, only one item and then stops. Thanks!

How do you make that gif?

I wonder which program do you use!

Scrollview Doesnt Update Data

I Am using Firebase , Grabbing Data and Using the Scrollview in A Fragment. The Fragment needs to loaded again in the drawer to show data

Dependent on size of first item in adapter

Problem : all list items take up the size of the first item in the adapter list - this is a terrible assumption for a generic library like this one!

My adapter has a header of toolbar height ?android:attr/actionBarSize and then a list variable length images - something like facebook's newsfeed. I ended up with a vertical stack of lots of items, all of the same toolbar height.

Is ther an easy fix to this? I haven't gone through the code yet, hence not aware of how much effort this would require.

Pre-binding adjacent items

Hi, is it possible to tweak the condition when an item view is laid out? My item view is fullscreen and that causes a little problem:

https://gifs.com/gif/58zJlZ

I need to bind the next item in background, that is - not just when a small edge of it becomes visible but earlier. In other words when item N becomes current item then at same time N+1 to be bound. As you can see from the video, my images are requested from network when the view appears, but that's too late. That should be done when the view is still off-screen. Is it possible to implement an "offscreen limit" like 1-2 items on both sides or to maintain an extra layout space like LinearLayoutManager does with https://developer.android.com/reference/android/support/v7/widget/LinearLayoutManager.html#getExtraLayoutSpace(android.support.v7.widget.RecyclerView.State)?

I need to get the currentPosition when click button

may be you should let the DiscreteScrollLayoutManager public or add a method to DiscreteScrollView to get the layoutManager。

Maybe there is mistake into fling algorithm

Sorry for my English. I use vertical scrollview, but i could not make it to work with fling. Then, i looked in the code and saw that:

DiscreteScrollView/library/src/main/java/com/yarolegovich/discretescrollview/DiscreteScrollLayoutManager.java

Lines 414 to 416 in bd07e7b

 public void onFling(int velocityX, int velocityY) { 

 int velocity = orientationHelper.getFlingVelocity(velocityX, velocityY); 

 int throttleValue = shouldSlideOnFling ? Math.abs(velocityX / flingThreshold) : 1;

I suggest that there should be
Math.abs(velocity/flingThreshold)
instead of
Math.abs(velocityX/flingThreshold)

Help: Gradual zoom decrease

Hi, is there a way to decrease zoom gradualy among items for example the current item in list is the most zoomed now what I mean is to zoom also adiacent items for example by 50% then others by 25% ecc...

setOffscreenItems doesn't work

Hello.
I want to use setOffscreenItems ,but it doesn't work.Can you tell me why,thank you very much

IndexOutOfBoundsException

java.lang.IndexOutOfBoundsException: Invalid item position -1(-1). Item count:6
i dont understand. thank you

onScroll() method from ScrollStateChangeListener called with incorrect params when call smoothScrollToPosition()

When I call srollView.smoothScrollToPosition(pos) and difference between pos and old position, for example, is 2 I got this results in CatLog:

08-05 18:18:38.818 20927-20927/com.some D/CropFormAdapter: onScrollStart() 0
08-05 18:18:38.835 20927-20927/com.some D/CropFormAdapter: onScroll() currentHolder = 0 newCurrentHolder = 1 scrollPosition = -0.14285715
08-05 18:18:38.852 20927-20927/com.some D/CropFormAdapter: onScroll() currentHolder = 0 newCurrentHolder = 1 scrollPosition = -0.2857143
08-05 18:18:38.868 20927-20927/com.some D/CropFormAdapter: onScroll() currentHolder = 0 newCurrentHolder = 1 scrollPosition = -0.42380953
08-05 18:18:38.885 20927-20927/com.some D/CropFormAdapter: onScroll() currentHolder = 0 newCurrentHolder = 1 scrollPosition = -0.54761904
08-05 18:18:38.901 20927-20927/com.some D/CropFormAdapter: onScroll() currentHolder = 0 newCurrentHolder = 1 scrollPosition = -0.67142856
08-05 18:18:38.918 20927-20927/com.some D/CropFormAdapter: onScroll() currentHolder = 0 newCurrentHolder = 1 scrollPosition = -0.78571427
08-05 18:18:38.935 20927-20927/com.some D/CropFormAdapter: onScroll() currentHolder = 0 newCurrentHolder = 1 scrollPosition = -0.9047619
08-05 18:18:38.951 20927-20927/com.some D/CropFormAdapter: onScroll() currentHolder = 0 newCurrentHolder = 1 scrollPosition = -1.0
08-05 18:18:38.969 20927-20927/com.some D/CropFormAdapter: onScroll() currentHolder = 0 newCurrentHolder = 1 scrollPosition = -1.0
08-05 18:18:38.985 20927-20927/com.some D/CropFormAdapter: onScroll() currentHolder = 0 newCurrentHolder = 1 scrollPosition = -1.0
08-05 18:18:39.000 20927-20927/com.some D/CropFormAdapter: onScroll() currentHolder = 0 newCurrentHolder = 1 scrollPosition = -1.0
08-05 18:18:39.017 20927-20927/com.some D/CropFormAdapter: onScroll() currentHolder = 0 newCurrentHolder = 1 scrollPosition = -1.0
08-05 18:18:39.033 20927-20927/com.some D/CropFormAdapter: onScroll() currentHolder = 0 newCurrentHolder = 1 scrollPosition = -1.0
08-05 18:18:39.051 20927-20927/com.some D/CropFormAdapter: onScroll() currentHolder = 0 newCurrentHolder = 1 scrollPosition = -1.0
08-05 18:18:39.066 20927-20927/com.some D/CropFormAdapter: onScroll() currentHolder = 0 newCurrentHolder = 1 scrollPosition = -1.0
08-05 18:18:39.084 20927-20927/com.some D/CropFormAdapter: onScroll() currentHolder = 0 newCurrentHolder = 1 scrollPosition = -1.0
08-05 18:18:39.099 20927-20927/com.some D/CropFormAdapter: onScroll() currentHolder = 0 newCurrentHolder = 1 scrollPosition = -1.0
08-05 18:18:39.117 20927-20927/com.some D/CropFormAdapter: onScroll() currentHolder = 0 newCurrentHolder = 1 scrollPosition = -1.0
08-05 18:18:39.133 20927-20927/com.some D/CropFormAdapter: onScroll() currentHolder = 0 newCurrentHolder = 1 scrollPosition = -1.0
08-05 18:18:39.150 20927-20927/com.some D/CropFormAdapter: onScroll() currentHolder = 0 newCurrentHolder = 1 scrollPosition = -1.0
08-05 18:18:39.167 20927-20927/com.some D/CropFormAdapter: onScroll() currentHolder = 0 newCurrentHolder = 1 scrollPosition = -1.0
08-05 18:18:39.184 20927-20927/com.some D/CropFormAdapter: onScroll() currentHolder = 0 newCurrentHolder = 1 scrollPosition = -1.0
08-05 18:18:39.200 20927-20927/com.some D/CropFormAdapter: onScroll() currentHolder = 0 newCurrentHolder = 1 scrollPosition = -1.0
08-05 18:18:39.215 20927-20927/com.some D/CropFormAdapter: onScroll() currentHolder = 0 newCurrentHolder = 1 scrollPosition = -1.0
08-05 18:18:39.233 20927-20927/com.some D/CropFormAdapter: onScroll() currentHolder = 0 newCurrentHolder = 1 scrollPosition = -1.0
08-05 18:18:39.249 20927-20927/com.some D/CropFormAdapter: onScroll() currentHolder = 0 newCurrentHolder = 1 scrollPosition = -1.0
08-05 18:18:39.266 20927-20927/com.some D/CropFormAdapter: onScroll() currentHolder = 0 newCurrentHolder = 1 scrollPosition = -1.0

When scroll started between 0 and 1 positions - ok, but when the scroll goes between 1 and 2 positions I got the incorrect viewHolders objects in the callback parameters (they have 0 and 1 positions, when I expected to get viewHolders with 1 and 2 positions), and scrollPosition in this case is always -1.0 (08-05 18:18:38.969) in the logs.

my code

Set non-selectable items?

Good day, thanks for your awesome library! Is there any way i can achieve this behavior where some items are not selectable? I mean what i'm trying to do is when i scroll to that particular position(that should not be selected), the DSV automatically scroll to other position. I already tried to do it with onScrollEnd and achieved what i wanted, but sometimes the position still get selected.

Single Scroll implementation.

Hi , how do I use just single scroll ?
I do not want to use the Infinite scroll. can I use single scroll adapter ?

Scrolling problems with async remote images

Hi,
im facing issues with scrolling its not smooth and when scrolling feels like "it's trying hard" to scroll to the next element.
I feed my recycle adapter with remote data and all images are loading remotely with glide.
The orientation of the descreteScrollview is horizontal.

Can someone please recommend, some fixes for smooth scrolling.

Thanks in advance.

Cover the code with tests

NO OnItemClickListener?

how to change the margin of neighbouring items?

NO OnItemClickListener?

how to make the view of（current position -1）reset all the childview's state or position？

Because I have an animation in the itemView，I wanna reset the itemView
when I remove it from the screen to the left side then scroll to the middle of screen,the item view will reset,I don't wanna call notifyDataSetChanged each time.I have found that viewholder setIsRecyclable(false); It will reset the itemview when the itemview not in Screen,how do I can make the view of（current position -1）reset reset all the childview's state or position when it not in the middle of Screen?

requiresFadingEdge doesn't work

I tried adding android:requiresFadingEdge="vertical|horizontal" to DiscreteScrollView in xml, but it had no effect. How can I add fading edge to it?

ScrollView isn't working properly with height of item = wrap_content

I am trying to use this library with a CardView as a viewholder. The card view height is set to wrap_content. The card_view has a textview inside it which makes it bigger or smaller according to the size of this text_view.

The ScrollView always show items with height equal to the height of the first item. Is there a way to make such behaviour work with DiscreteScrollView ?

How can you not recycle？

Not working with android Appcompat

I'm using android appcompat lib and when I try to add this lib in gradle file under dependencies on sync android studio give an error for support libraries like appcompat, recyclerview etc.
This is what I get on sync

Error:Failed to resolve: com.android.support:appcompat-v7:26.0.0
<a href="install.m2.repo">Install Repository and sync project</a><br><a href="openFile:E:/Android_Studio_and_SDK/Opencart_android/app/build.gradle">Open File</a><br><a href="open.dependency.in.project.structure">Show in Project Structure dialog</a>

And this

Error:Failed to resolve: com.android.support:recyclerview-v7:26.0.0
<a href="install.m2.repo">Install Repository and sync project</a><br><a href="openFile:E:/Android_Studio_and_SDK/Opencart_android/app/build.gradle">Open File</a><br><a href="open.dependency.in.project.structure">Show in Project Structure dialog</a>

But when I remove this lib (DiscreteScrollView) everything is work fine as usual. I tried more than once.
I'm using

Android studio 2.3.3
gradle-3.3
Java 8

Child Item loaded problem.

Hello, thanks for this great library.
It looks really nice 👍

But I found that will be laggy when we have more data on it.
I try to figure out, then I found that the DiscreteScrollView will load "all child item" when init.
So if all of my data(picture) are different, it will cause laggy and even out of memory.

My question is that why DiscreteScrollView need to loaded "all child item" and keep them?
Is it necessary or for some unknown reason?

Looking forward to your reply.
Thanks again : D

Invalid target position when scrolling

Hi, Thanks for the great library. I encountered an app crash with the following stacktrace when using the latest (1.3.0) version. I simply fetch a list from an api and update the RV adapter with notifyDatasetChanged() after setting the new list. It works fine if there are more than 2 items in the list. But it crashes if there are 2 or fewer items in the list. The crash occurs soon after I scroll the first item.

java.lang.IllegalArgumentException: Invalid target position
    at android.support.v7.widget.RecyclerView$SmoothScroller.start(RecyclerView.java:11132)
    at android.support.v7.widget.RecyclerView$LayoutManager.startSmoothScroll(RecyclerView.java:7871)
    at com.yarolegovich.discretescrollview.DiscreteScrollLayoutManager.startSmoothPendingScroll(DiscreteScrollLayoutManager.java:463)
    at com.yarolegovich.discretescrollview.DiscreteScrollLayoutManager.onScrollEnd(DiscreteScrollLayoutManager.java:390)
    at com.yarolegovich.discretescrollview.DiscreteScrollLayoutManager.onScrollStateChanged(DiscreteScrollLayoutManager.java:351)
    at android.support.v7.widget.RecyclerView.dispatchOnScrollStateChanged(RecyclerView.java:4746)
    at android.support.v7.widget.RecyclerView.setScrollState(RecyclerView.java:1434)
    at android.support.v7.widget.RecyclerView.cancelTouch(RecyclerView.java:3023)
    at android.support.v7.widget.RecyclerView.onTouchEvent(RecyclerView.java:3001)
    at android.view.View.dispatchTouchEvent(View.java:11721)
    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2929)
    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2636)
    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2931)
    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2650)
    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2931)
    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2650)
    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2931)
    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2650)
    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2931)
    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2650)
    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2961)
    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2650)
    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2961)
    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2650)
    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2961)
    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2650)
    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2961)
    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2650)
    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2961)
    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2650)
    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2961)
    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2650)
    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2961)
    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2650)
    at com.android.internal.policy.DecorView.superDispatchTouchEvent(DecorView.java:445)
    at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1828)
    at android.app.Activity.dispatchTouchEvent(Activity.java:3292)
    at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:68)
    at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:68)
    at com.android.internal.policy.DecorView.dispatchTouchEvent(DecorView.java:407)
    at android.view.View.dispatchPointerEvent(View.java:11960)
    at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4776)
    at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4590)
    at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4128)
    at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4181)
    at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4147)
    at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4274)
    at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4155)

How do you align left?

in the futrue，this will add some featrues？

for example ，i can insert a item and delete a item smoothly with long click the item？or add some tranformer？thank

notifyDataSetChanged issue

Calling on notifyDataSetChanged() list scroll to the first position, so how to notify particular item or adapter?

compile Version problem for this library

compile Version problem for this library giving error

Cropped bottom fields of CardView list items

I'm using CardView as a list item view with wrap_content height option. Every time, I faced cropped bottom side of view about 30dp.

how to implement for build tools 25.0.2

i want to implement this for build tools 25.0.2 and my minsdk is 16 , is it possible to do that ?
if yes how ?

java.lang.IndexOutOfBoundsException: Invalid item position 20(20). Item count:20

I've got the following exception:

java.lang.IndexOutOfBoundsException: Invalid item position 20(20). Item count:20
at android.support.v7.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:5466)
       at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5440)
       at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5436)
       at com.yarolegovich.discretescrollview.DiscreteScrollLayoutManager.layoutView(DiscreteScrollLayoutManager.java:160)
       at com.yarolegovich.discretescrollview.DiscreteScrollLayoutManager.fill(DiscreteScrollLayoutManager.java:133)
       at com.yarolegovich.discretescrollview.DiscreteScrollLayoutManager.onLayoutChildren(DiscreteScrollLayoutManager.java:93)
       at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3583)
       at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:3312)
       at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3844)
...

Repro:

Add N items
Remove N items - in DiscreteScrollLayoutManager.onItemsRemoved() currentPosition becomes 0 but I think it is more correct to become -1 (NO_POSITION) as an index range of an empty adapter is also empty. So currentPosition is better to be reverted to the initial NO_POSITION.
Add some 20 items - in DiscreteScrollLayoutManager.onItemsAdded() currentPosition becomes 0 + 20 = 20 but it should be 19.

public void onItemsRemoved(RecyclerView recyclerView, int positionStart, int itemCount) {
        if (getItemCount() == 0) {
            currentPosition = NO_POSITION;
        } else if (currentPosition >= positionStart) {

            // What about this correction?
            // currentPosition = Math.max(0, currentPosition - itemCount);
            currentPosition = Math.max(NO_POSITION, currentPosition - itemCount);
        }
    }

can i set the position of the item?

how do i do so?

ready to add setCurrentPosition

#47

ViewHolder cannot show correct width

I am trying to implement a Google play store like screenshot scroll view with different image width.
As you can see from the image above the last image can not show the full width (the black border is the background of the viewholder), I have tried to set the LayoutParams in runtime but still nothing change

 mViewImage.setLayoutParams(new RelativeLayout.LayoutParams(bitmap.getWidth(), bitmap.getHeight()));
 mViewImage.setImageBitmap(bitmap);

and the holder xml like this

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/wrapper"
    android:background="@android:color/black"
    android:padding="4dp">

    <ImageView
        android:id="@+id/image"
        android:layout_centerInParent="true"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</RelativeLayout>

is there any hints to solve this problem ?

	public void onFling(int velocityX, int velocityY) {
	int velocity = orientationHelper.getFlingVelocity(velocityX, velocityY);
	int throttleValue = shouldSlideOnFling ? Math.abs(velocityX / flingThreshold) : 1;

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