Recycleview scroll to a position not working inside Nestedscrollview

This is how I resolve this issue

first get recycle view position that need to scroll using below method

final float y = recyclerView.getChildAt(selectedItem.getPos()).getY();

Then scroll nested scroll view to that position
nestedScrollingView.post(new Runnable() { @Override public void run() { nestedScrollingView.fling(0); nestedScrollingView.smoothScrollTo(0, (int) y); } });

Don't forget to add android:fillViewport="true" on nestedscrollview

The thing is that you need to scroll the NestedScrollView, not the RecyclerView. E.g:

    final float y = recyclerView.getChildAt(selectedItem.getPos()).getY(); 

    scrollView.smoothScrollTo(0, y)

<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"
android:fitsSystemWindows="true"
tools:context=".MainActivity">

<android.support.design.widget.AppBarLayout
    android:id="@+id/appBar"
    android:layout_width="match_parent"
    android:layout_height="300dp"
    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
    android:fitsSystemWindows="true">

    <android.support.design.widget.CollapsingToolbarLayout
        android:id="@+id/collapsingToolbar"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_scrollFlags="scroll|exitUntilCollapsed"
        android:fitsSystemWindows="true"
        app:contentScrim="?attr/colorPrimary"
        app:expandedTitleMarginStart="48dp"
        app:expandedTitleMarginEnd="64dp"
        app:title="Scroll">

        <ImageView
            android:id="@+id/toolbarImage"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:scaleType="centerCrop"
            android:fitsSystemWindows="true"
            android:src="@mipmap/ic_launcher"
            app:layout_collapseMode="parallax" />

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
            app:layout_collapseMode="pin" />
    </android.support.design.widget.CollapsingToolbarLayout>

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

    <android.support.v7.widget.RecyclerView
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        android:id="@+id/recycler_view"
        android:scrollbars="vertical"
        android:nestedScrollingEnabled="false"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

Remove the NestedScrollView and add

app:layout_behavior="@string/appbar_scrolling_view_behavior"

to your Recyclerview.Then ScrollToPosition works fine.