Firstly, thank you for your handwork, but I got issue when try to multiple delete from the bottom of item it always got IndexOutBoundsException, but if i just remove it individually it was good, and if i multiple delete from top item sometimes good sometimes got error.

java.lang.IndexOutOfBoundsException: invalid position 37. State item count is 36 at android.support.v7.widget.RecyclerView$Recycler.convertPreLayoutPositionToPostLayout(RecyclerView.java:3234) at android.support.v7.widget.RecyclerViewHelper.convertPreLayoutPositionToPostLayout(RecyclerViewHelper.java:6) at library.StickyHeadersItemDecoration.isHeader(StickyHeadersItemDecoration.java:110) at library.StickyHeadersItemDecoration.onDrawOver(StickyHeadersItemDecoration.java:58)

*note i use https://github.com/writtmeyer/recyclerviewdemo for multiple delete item

Hi, with the latest version (0.4.3) I get a IndexOutOfBoundsException (Invalid index 0, size is 0) when I delete the last item from my Adapter.

This is the code I use:

public void deleteVocable(Vocable vocable) {
        for (int i = 0; i < data.size(); i++) {
            if (vocable.getId() == data.get(i).getId()) {
                data.remove(i);
                this.notifyItemRemoved(i);
                break;
            }
        }
    }

Hi, I have an issue when using your library. When I try to build my project with the command 'gradle build', I get the following warnings:

Warning: com.eowise.recyclerview.stickyheaders.HeaderStore$1: can't find referenced method 'android.support.v7.widget.RecyclerView access$100(com.eowise.recyclerview.stickyheaders.HeaderStore)' in program class com.eowise.recyclerview.stickyheaders.HeaderStore Warning: com.eowise.recyclerview.stickyheaders.HeaderStore$1: can't find referenced class com.eowise.recyclerview.stickyheaders.HeaderInfo Warning: com.eowise.recyclerview.stickyheaders.HeaderStore$1: can't find referenced class com.eowise.recyclerview.stickyheaders.HeaderInfo Warning: com.eowise.recyclerview.stickyheaders.HeaderStore$1$1: can't find referenced class com.eowise.recyclerview.stickyheaders.HeaderInfo Warning: com.eowise.recyclerview.stickyheaders.HeaderStore$1$1: can't find referenced class com.eowise.recyclerview.stickyheaders.HeaderInfo Warning: com.eowise.recyclerview.stickyheaders.HeaderStore$1$1: can't find referenced class com.eowise.recyclerview.stickyheaders.HeaderInfo Warning: com.eowise.recyclerview.stickyheaders.HeaderStore$1$1: can't find referenced method 'java.util.HashMap access$000(com.eowise.recyclerview.stickyheaders.HeaderStore)' in program class com.eowise.recyclerview.stickyheaders.HeaderStore Warning: com.eowise.recyclerview.stickyheaders.HeaderStore$1$1: can't find referenced class com.eowise.recyclerview.stickyheaders.HeaderInfo Warning: com.eowise.recyclerview.stickyheaders.HeaderStore$1$1: can't find referenced class com.eowise.recyclerview.stickyheaders.HeaderInfo Warning: there were 7 unresolved references to classes or interfaces.

I am using the library this way:

dependencies { compile 'com.eowise:recyclerview-stickyheaders:0.5.1@aar' }

So my project build fails with this exception:

FAILURE: Build failed with an exception.

java.io.IOException: Please correct the above warnings first.

Do you know what might be the problem? Thank you very much in advance

I've been trying to use your library in order to create the picture above. Is it possible? How should I do it? I've failed miserably in order to create it.

Hi, I just discovered a new Force Close:

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:2485)
            at com.eowise.recyclerview.stickyheaders.StickyHeadersTouchListener$SingleTapDetector.findItemHolderUnder(StickyHeadersTouchListener.java:78)
            at com.eowise.recyclerview.stickyheaders.StickyHeadersTouchListener$SingleTapDetector.onSingleTapConfirmed(StickyHeadersTouchListener.java:53)
            at android.view.GestureDetector$GestureHandler.handleMessage(GestureDetector.java:273)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5221)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:898)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:693)

In my case I add one element with one header and then 2 other elements with another header. When I delete all items starting from the bottom, the app closes when I delete the last. (that at top) It looks like it has to do with the on header click listener which I use.

None of my code is hit in this stack trace (see below). I am getting this error when reducing the size of my list from many to 1 with an adapter change. I've traced the source of the issue to the face that when StickyHeaderItemDecoration.drawHeaders line:53 is called, the adapter has a size of 1, parent.mState has a size of 1, but parent.getChildCount() == 2 . The second unwanted view contains data from the previous version of the list that shouldn't be there.

No matter how I notify the RecyclerView of an adapter change (notifyDataSetChanged, notifyItemRangeRemoved) the RecyclerView is out of sync with the adapter when StickyHeaderItemDecoration.drawHeaders is called - the for loop their picks up a child that should not exist.

I have a dozen classes involved in this situation, so before I take the hours required to make a simpler version of this failure, do you have any suggestions?

  java.lang.IndexOutOfBoundsException: invalid position 1. State item count is 1
            at android.support.v7.widget.RecyclerView$Recycler.convertPreLayoutPositionToPostLayout(RecyclerView.java:3316)
            at android.support.v7.widget.RecyclerViewHelper.convertPreLayoutPositionToPostLayout(RecyclerViewHelper.java:9)
            at com.eowise.recyclerview.stickyheaders.HeaderStore.isHeader(HeaderStore.java:72)
            at com.eowise.recyclerview.stickyheaders.StickyHeadersItemDecoration.drawHeaders(StickyHeadersItemDecoration.java:62)
            at com.eowise.recyclerview.stickyheaders.StickyHeadersItemDecoration.onDrawOver(StickyHeadersItemDecoration.java:44)
            at android.support.v7.widget.RecyclerView.draw(RecyclerView.java:2266)
            at android.view.View.getDisplayList(View.java:12838)
            at android.view.View.getDisplayList(View.java:12880)
            at android.view.View.draw(View.java:13657)
            at android.view.ViewGroup.drawChild(ViewGroup.java:3086)
            at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2930)
            at android.view.View.draw(View.java:13947)
            at android.view.View.getDisplayList(View.java:12838)
            at android.view.View.getDisplayList(View.java:12880)
            at android.view.View.draw(View.java:13657)
            at android.view.ViewGroup.drawChild(ViewGroup.java:3086)
            at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2923)
            at android.view.View.getDisplayList(View.java:12833)
            at android.view.View.getDisplayList(View.java:12880)
            at android.view.View.draw(View.java:13657)
            at android.view.ViewGroup.drawChild(ViewGroup.java:3086)
            at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2923)
            at android.view.View.getDisplayList(View.java:12833)
            at android.view.View.getDisplayList(View.java:12880)
            at android.view.View.draw(View.java:13657)
            at android.view.ViewGroup.drawChild(ViewGroup.java:3086)
            at android.support.v4.widget.DrawerLayout.drawChild(DrawerLayout.java:1060)
            at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2923)
            at android.view.View.getDisplayList(View.java:12833)
            at android.view.View.getDisplayList(View.java:12880)
            at android.view.View.draw(View.java:13657)
            at android.view.ViewGroup.drawChild(ViewGroup.java:3086)
            at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2923)
            at android.view.View.getDisplayList(View.java:12833)
            at android.view.View.getDisplayList(View.java:12880)
            at android.view.View.draw(View.java:13657)
            at android.view.ViewGroup.drawChild(ViewGroup.java:3086)
            at com.jakewharton.madge.MadgeFrameLayout.drawChild(MadgeFrameLayout.java:85)
            at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2923)
            at android.view.View.getDisplayList(View.java:12833)
            at android.view.View.getDisplayList(View.java:12880)
            at android.view.View.draw(View.java:13657)
            at android.view.ViewGroup.drawChild(ViewGroup.java:3086)
            at android.support.v4.widget.DrawerLayout.drawChild(DrawerLayout.java:1060)
            at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2923)
            at android.view.View.getDisplayList(View.java:12833)
            at android.view.View.getDisplayList(View.java:12880)
            at android.view.View.draw(View.java:13657)
            at android.view.ViewGroup.drawChild(ViewGroup.java:3086)
            at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2923)
            at android.view.View.draw(View.java:13947)
            at android.widget.FrameLayout.draw(FrameLayout.java:467)
            at android.view.View.getDisplayList(View.java:12838)
            at android.view.View.getDisplayList(View.java:12880)
            at android.view.View.draw(View.java:13657)
            at android.view.ViewGroup.drawChild(ViewGroup.java:3086)
            at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2923)
            at android.view.View.draw(View.java:13947)
            at android.support.v7.internal.widget.ActionBarOverlayLayout.draw(ActionBarOverlayLayout.java:509)
            at android.view.View.getDisplayList(View.java:12838)
            at android.view.View.getDisplayList(View.java:12880)
            at android.view.View.draw(View.java:13657)
            at android.view.ViewGroup.drawChild(ViewGroup.java:3086)
            at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2923)
            at android.view.View.getDisplayList(View.java:12833)
            at android.view.View.getDisplayList(View.java:12880

I am having a list with the following structure. Header1 Item1 Item2 Item3 Header2 Item4 Header3 item5

When I try to move the last three items to bottom of the list using notifyItemMoved I get the following the result

Header2 Item4 Item5 Item1 Header1 Item2 Header1 Item3

Calling notifydatasetChanged fixes this and produces the correct list Header2 Item4 Header3 Item5 Header1 Item1 Item2 Item3 But that makes the animation of the notifyItemMoved look very weird

For me it looks like the placement of the headers does not get updated only the content of the already placed headers does get updated.

When scrolling RecycleView it is clearly visible that headers overlay scrollbar, looks like scrollbar is under the header.

My header layout:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="?listPreferredItemHeightSmall"
    android:background="@color/background_color"
    android:paddingTop="8dp"
    android:paddingStart="8dp"
    android:paddingEnd="8dp">

    <TextView
        android:id="@android:id/text1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingLeft="8dp"
        android:paddingRight="8dp"
        android:textAppearance="@style/TextAppearance.AppCompat.Title" />

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        android:src="?android:listDivider"
        android:scaleType="fitXY"/>

</FrameLayout>

Hi, Sometimes, when a header reach the top of the view (when scrolling down in a list for example), the header do not replace the one above him, but instead is drawn under the current top header. When the "future" top header reach totally the top of the view, it is finally correctly draw above the old header at top.

What could occurs is that the "old" top header is not always correctly animated ?

If needed, I can provide a sample project.

I'm trying to register a click listener on the header view or any of it's child views. However, for some reason they don't seem to be called. Is this a known issue? Have you tried that before?

Thanks, Stefan

The measure code breaks in 4.2.2 - at least thats my experience, I got a 5.0 and a 4.2.2 device and onmeasure breaks on the second one.

Turns out that View.MeasureSpec.makeMeasureSpec(WRAP_CONTENT ... is wrong

for example , i have got a checkbox on my header , I want to update the checkBox when I click the header (include the stickyHeader)
how can I make it works ? Obviously , there is no method like "notifyDataSetChange" in StickyHeaderApapter

I wanted to test this project, but as the author said, it is deprecated, so I've worked on my implementation of the sticky headers still using a custom ItemDecoration but with a lot of advantages... The project is https://github.com/davideas/FlexibleAdapter. Adding, removing, dragging items are also covered, header is automatically re-linked to the item below.

For information, I've also written an answer at this question: http://stackoverflow.com/questions/33018788/how-can-i-set-a-listener-inside-a-recyclerview-header-decor

EDIT of 29/03/2016 Sticky Headers are now clickable using same listeners of the ViewHolder, not using anymore ItemDecoration. A FrameLayout is instead used.

Finally, I agree with the author when he says that ItemDecoration is not the good way for sticky headers, and a custom LayoutManager or a ViewGroup should handle the HeaderView object. So I am searching help for this. The project SuperSlim is based on the LayoutManager, but it is a huge library: ~3400 lines for sections and sticky headers only(!?). However I did not test it for compatibility with my project.

public class RecyclerViewHelper {

public static int convertPreLayoutPositionToPostLayout(RecyclerView recyclerView, int position) {
    return recyclerView.mRecycler.convertPreLayoutPositionToPostLayout(position);
}

}

Since the header must have a background, it will hide the scrollbar of the RecyclerView in case it takes the whole width. And, if I choose to avoid having a background, it shows what's behind itself