Detener desplazamiento del elemento primario (NestedScrollview) al desplazarse Hijo (RecyclerView)

Necesito un comportamiento similar a esta implementación, pero NestedScrollView sería el padre y RecyclerView sería el hijo de NestedScrollView.

Por ejemplo: https://medium.com/widgetlabs-engineering/scrollable-nestedscrollviews-inside-recyclerview-ca65050d828a

No estoy seguro de si se puede lograr. Intenté deshabilitar el padre (NSV) mientras el niño (RV) se desplaza, pero desplazarse en el niño desplaza toda la vista, incluido el padre.

Implementé la solución Marc Knaup y todo funciona correctamente si NestedScrollViewfuera el padre y el resultado se muestra a continuación

por cierto, pongo lo que he hecho

CustomRecycleView

package com.example.nested_scroll_test;

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;

import androidx.core.view.NestedScrollingParent;
import androidx.recyclerview.widget.RecyclerView;

public class CustomRecycleView extends RecyclerView implements NestedScrollingParent {
    private View nestedScrollTarget = null;
    private boolean nestedScrollTargetIsBeingDragged = false;
    private boolean nestedScrollTargetWasUnableToScroll = false;
    private boolean skipsTouchInterception = false;


    public CustomRecycleView(Context context) {
        super(context);
    }

    public CustomRecycleView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public CustomRecycleView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }


    @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        boolean temporarilySkipsInterception = nestedScrollTarget != null;
        if (temporarilySkipsInterception) {
            // If a descendent view is scrolling we set a flag to temporarily skip our onInterceptTouchEvent implementation
            skipsTouchInterception = true;
        }

        // First dispatch, potentially skipping our onInterceptTouchEvent
        boolean handled = super.dispatchTouchEvent(ev);

        if (temporarilySkipsInterception) {
            skipsTouchInterception = false;

            // If the first dispatch yielded no result or we noticed that the descendent view is unable to scroll in the
            // direction the user is scrolling, we dispatch once more but without skipping our onInterceptTouchEvent.
            // Note that RecyclerView automatically cancels active touches of all its descendents once it starts scrolling
            // so we don't have to do that.
            if (!handled || nestedScrollTargetWasUnableToScroll) {
                handled = super.dispatchTouchEvent(ev);
            }
        }

        return handled;
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent e) {
        return !skipsTouchInterception && super.onInterceptTouchEvent(e);
    }

    @Override
    public void onNestedScroll(View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed) {
        if (dyConsumed != 0) {
            // The descendent was actually scrolled, so we won't bother it any longer.
            // It will receive all future events until it finished scrolling.
            nestedScrollTargetIsBeingDragged = true;
            nestedScrollTargetWasUnableToScroll = false;
        } else if (dyConsumed == 0 && dyUnconsumed != 0) {
            // The descendent tried scrolling in response to touch movements but was not able to do so.
            // We remember that in order to allow RecyclerView to take over scrolling.
            nestedScrollTargetWasUnableToScroll = true;
            if (target.getParent() != null)
                target.getParent().requestDisallowInterceptTouchEvent(false);
        }
    }

    @Override
    public void onNestedScrollAccepted(View child, View target, int axes) {
        if (axes != 0 && View.SCROLL_AXIS_VERTICAL != 0) {
            // A descendent started scrolling, so we'll observe it.
            nestedScrollTarget = target;
            nestedScrollTargetIsBeingDragged = false;
            nestedScrollTargetWasUnableToScroll = false;
        }

        super.onNestedScrollAccepted(child, target, axes);
    }

    @Override
    public boolean onStartNestedScroll(View child, View target, int nestedScrollAxes) {
        return nestedScrollAxes != 0 && View.SCROLL_AXIS_VERTICAL != 0;
    }

    @Override
    public void onStopNestedScroll(View child) {
        nestedScrollTarget = null;
        nestedScrollTargetIsBeingDragged = false;
        nestedScrollTargetWasUnableToScroll = false;
    }
}

content_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.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"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context=".MainActivity"
    tools:showIn="@layout/activity_main">


    <androidx.core.widget.NestedScrollView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorAccent"
        android:orientation="vertical">

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

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="150dp"
                android:background="#FFFFFF"
                android:orientation="vertical">
                <TextView
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:textAlignment="center"
                    android:text="Top Section"/>
            </LinearLayout>

            <com.example.nested_scroll_test.CustomRecycleView
                android:id="@+id/rw"
                android:layout_width="match_parent"
                android:layout_height="300dp"
                android:background="@color/colorPrimary"
                android:nestedScrollingEnabled="true"
                android:orientation="vertical">

            </com.example.nested_scroll_test.CustomRecycleView>

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="150dp"
                android:background="#FFFFFF"
                android:orientation="vertical" >
                <TextView
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:textAlignment="center"
                    android:text="Bottom Section"/>
            </LinearLayout>
        </LinearLayout>
    </androidx.core.widget.NestedScrollView>


</androidx.coordinatorlayout.widget.CoordinatorLayout>

RecycleViewItem.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.core.widget.NestedScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/nsw"
    android:layout_width="match_parent"
    android:layout_height="50dp"
    android:orientation="vertical">

    <TextView
        android:id="@+id/textview"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="2dp"
        android:background="#CCCC"
        android:gravity="center"
        android:nestedScrollingEnabled="false"
        android:orientation="vertical"
        android:padding="2dp"
        android:textColor="#FFFFFF" />
</androidx.core.widget.NestedScrollView>

@Rockin usa overscrollmode bro :)

 <androidx.core.widget.NestedScrollView
    android:layout_width="match_parent"
    android:fillViewport="true"
    android:overScrollMode="always"
    android:layout_height="match_parent">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/color_white"
        android:orientation="vertical">


       <androidx.recyclerview.widget.RecyclerView                
           android:id="@+id/activity_insight_recyclerview_list"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_marginTop="@dimen/_20sdp"
          app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
            tools:listitem="@layout/raw_insight" />

publica todo lo que has probado hasta ahora.

tu xml debería ser,

<android.support.v4.widget.NestedScrollView
            android:id="@+id/nestedScrollView"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:overScrollMode="never">


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

              <View > <!-- upper content -->

              <!-- set recycler view with with wrap_content -->
              <android.support.v7.widget.RecyclerView
                    android:id="@+id/recyclerView"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content" />

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

establecer el comportamiento de desplazamiento dentro del método onCreateView () / onCreate (). requiere Api 21+.

    RecyclerView v = (RecyclerView) findViewById(...);
    v.setNestedScrollingEnabled(false);
                   or 
    android:nestedScrollingEnabled="false"  // inside recycler view in xml file

Esta es una demostración de lo que desea ver, en el archivo MainActivity.xml :

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="MainActivity">

    <android.support.v4.widget.NestedScrollView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:scrollbars="none">
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:focusableInTouchMode="true"
            android:orientation="vertical">
            <ImageView
                android:id="@+id/top_seller"
                android:layout_width="match_parent"
                android:layout_height="200sp"
                android:background="@color/colorAccent"
                android:contentDescription="@string/app_name"
                android:adjustViewBounds="true"
                android:src="@drawable/background"
                android:scaleType="fitXY"/>
            <ImageView
                android:id="@+id/top_seller1"
                android:layout_width="match_parent"
                android:layout_height="200sp"
                android:background="@color/colorAccent"
                android:contentDescription="@string/app_name"
                android:adjustViewBounds="true"
                android:src="@drawable/background"
                android:scaleType="fitXY"/>
            <android.support.v7.widget.RecyclerView
                android:id="@+id/product_list"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="vertical"
                android:scrollbars="none" />
            <ImageView
                android:id="@+id/top_seller2"
                android:layout_width="match_parent"
                android:layout_height="200sp"
                android:background="@color/colorAccent"
                android:contentDescription="@string/app_name"
                android:adjustViewBounds="true"
                android:src="@drawable/background"
                android:scaleType="fitXY"/>
            <ImageView
                android:id="@+id/top_seller3"
                android:layout_width="match_parent"
                android:layout_height="200sp"
                android:background="@color/colorAccent"
                android:contentDescription="@string/app_name"
                android:adjustViewBounds="true"
                android:src="@drawable/background"
                android:scaleType="fitXY"/>
        </LinearLayout>
    </android.support.v4.widget.NestedScrollView>
</LinearLayout>

En su método de clase MainActivity.javaonCreate :

   RecyclerView bestRecyclerView = findViewById(R.id.product_list);
   GridLayoutManager mGrid = new GridLayoutManager(this, 2);
   bestRecyclerView.setLayoutManager(mGrid);
   bestRecyclerView.setHasFixedSize(true);
   bestRecyclerView.setNestedScrollingEnabled(false);
   // Create ProductAdapter for  RecyclerView data
   ProductAdapter mAdapter = new ProductAdapter(MainActivity4.this,getProductTestData());
   bestRecyclerView.setAdapter(mAdapter);

¡Espero que te ayude ...!

¿Has intentado subclasificar el RV y anular en InterceptTouchEvent?

override fun onInterceptTouchEvent(event: MotionEvent?): Boolean {

    when (event!!.action and MotionEvent.ACTION_MASK) {


        MotionEvent.ACTION_DOWN -> {

            // WE INTERACT WITH THIS RV. PREVENT PARENT TO INTERCEPT 
            parent.requestDisallowInterceptTouchEvent(true) 

        }


        MotionEvent.ACTION_MOVE, MotionEvent.ACTION_CANCEL, MotionEvent.ACTION_UP -> {

            // THIS SEEMS LIKE IT WILL HAVE "DEFAULT" BEHAVIOUR BUT SINCE WE CURRENTLY DRAGGING THE RV THEN IT WONT SCROLL THE PARENT  
            parent.requestDisallowInterceptTouchEvent(false)

        }

    }

    return false
}