bug when use CoordinatorLayout and UltimateRecyclerView with PtrFrameLayout?

[Yellup]

simple XML: <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical">

<android.support.design.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/main_content"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_above="@+id/driver">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <View
            android:id="@+id/nv_bar"
            android:layout_height="46dip"
            android:background="?attr/colorPrimary"
            style="@style/Layout_Full_Width"
            app:layout_scrollFlags="scroll|enterAlways" />

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

    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:overScrollMode="never"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"/>

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

and the ViewPager just contains a UltimateRecyclerView that with PtrFrameLayout, when app start, the UltimateRecyclerView in the top without scroll, and now scroll up(hand ↑),it will happen touch conflict, is a bug or my error usage?

[jjhesk]

it is still under construction for bug fixing because the recyclerview has been changed for better support from the load more issue. we need to come back to take out the referencing issue from the PtrFrameLayout.

[Yellup]

i fix it whit some change of UltimateRecyclerView by let UltimateRecyclerView implements NestedScrollingParent and change some sourecode to Adapted my project, but it's not elegant