RecyclerView滚动不适用于NestedScrollView

如果您只想平滑滚动，则不需要自定义滚动，就像我在其他一些线程中提到的那样。

当您想开始平滑滚动时，添加以下内容

appBarLayout.setExpanded(false, /*true if animation required else false*/true);
recyclerView.smoothScrollToPosition(position);

附加信息

此外，我RecyclerView在您的布局中看不到任何内容，并且有可能将其保留在的LinearLayout一部分中CollapsingToolbarLayout。我完全不知道你为什么一直RecyclerView参加CollapsingToolbarLayout。我将给出一个正在使用的布局（简化的布局）。

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

    <android.support.design.widget.CoordinatorLayout
        android:id="@+id/container"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <android.support.design.widget.AppBarLayout
            android:id="@+id/app_bar_layout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:expanded="true"
            app:layout_behavior="com.company.app.custom.CustomRecyclerScrollBehavior">

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

                <FrameLayout
                    android:id="@+id/header_frame"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    app:layout_collapseMode="parallax"
                    app:layout_collapseParallaxMultiplier="0.8">

                    <com.company.app.custom.CustomViewPager
                        android:id="@+id/view_pager"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        app:calculation="height"
                        app:height_ratio="@integer/product_listitem_img_width_ratio"
                        app:width_ratio="@integer/product_listitem_img_height_ratio" />

                    <com.company.app.custom.CustomImageView
                        android:id="@+id/img_stock_layer"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:adjustViewBounds="true"
                        android:scaleType="fitXY"
                        android:src="@color/transparent_app_black"
                        android:visibility="gone"
                        app:calculation_type="height"
                        app:ratio_height="@integer/product_listitem_img_width_ratio"
                        app:ratio_width="@integer/product_listitem_img_height_ratio" />

                    <com.inneex.www.customfonts.FontTextView
                        android:id="@+id/lbl_out_of_stock"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_gravity="center"
                        android:text="@string/out_of_stock"
                        android:textColor="?android:attr/textColorPrimaryInverse"
                        android:textSize="13sp"
                        android:visibility="gone"
                        app:customFont="@string/font_ss_semibold" />

                    <LinearLayout
                        android:id="@+id/ll_page"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_gravity="bottom|center_horizontal"
                        android:orientation="horizontal"
                        android:paddingBottom="@dimen/inspire_detail_oval_margin_bottom" />

                </FrameLayout>

                <android.support.v7.widget.Toolbar
                    android:id="@+id/main_toolbar"
                    android:layout_width="match_parent"
                    android:layout_height="@dimen/toolbar_height"
                    android:background="?attr/colorPrimary"
                    app:layout_anchor="@id/header_frame"
                    app:layout_collapseMode="pin"
                    app:title="">

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

                        <com.inneex.www.customfonts.FontTextView
                            android:id="@+id/lbl_toolbar_product_name"
                            android:layout_width="0dp"
                            android:layout_height="wrap_content"
                            android:layout_gravity="center"
                            android:layout_weight="1"
                            android:ellipsize="end"
                            android:lines="1"
                            android:maxLines="1"
                            android:minLines="1"
                            android:textColor="?android:attr/textColorPrimary"
                            android:textSize="18sp"
                            app:customFont="@string/font_ss_semibold" />

                    </LinearLayout>
                </android.support.v7.widget.Toolbar>
            </android.support.design.widget.CollapsingToolbarLayout>

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

        <ImageView
            android:id="@+id/img_back"
            android:layout_width="@dimen/toolbar_height"
            android:layout_height="@dimen/toolbar_height"
            android:layout_gravity="top|start"
            android:scaleType="fitXY"
            android:src="@drawable/back"
            app:layout_collapseMode="parallax" />

        <android.support.v7.widget.RecyclerView
            android:id="@+id/recycler_view"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="@color/white"
            app:layout_behavior="@string/appbar_scrolling_view_behavior" />

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

    <include
        layout="@layout/listitem_product_detail_buy_cheap"
        android:layout_width="match_parent"
        android:layout_height="@dimen/product_detail_button_buy_cheap_height"
        android:layout_alignParentBottom="true"
        android:layout_gravity="bottom" />

</RelativeLayout>

FrameLayoutidheader_frame为id的对象负责大型工具栏，该工具栏在滚动时会折叠。ToolbarIDmain_toolbar为ID的对象负责折叠工具栏视图。RecyclerView是下面的AppBarLayout。ImageView是用于后退按钮，折叠Toolbar显示后将显示该按钮。

作为参考，为了使滚动更流畅，我添加CustomRecyclerScrollBehavior了我之前与您交谈过的内容。这就是它

import android.content.Context;
import android.support.design.widget.AppBarLayout;
import android.support.design.widget.CoordinatorLayout;
import android.support.v7.widget.RecyclerView;
import android.util.AttributeSet;
import android.view.View;

import java.lang.ref.WeakReference;
import java.util.HashMap;
import java.util.Map;

/**
 * Created by jimitpatel on 13/12/16.
 */

public class CustomRecyclerScrollBehavior extends AppBarLayout.Behavior {

    private Map<RecyclerView, RecyclerViewScrollListener> scrollListenerMap = new HashMap<>(); //keep scroll listener map, the custom scroll listener also keep the current scroll Y position.


    public CustomRecyclerScrollBehavior() {
    }

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

    /**
     *
     * @param coordinatorLayout
     * @param child The child that attached the behavior (AppBarLayout)
     * @param target The scrolling target e.g. a recyclerView or NestedScrollView
     * @param velocityX
     * @param velocityY
     * @param consumed The fling should be consumed by the scrolling target or not
     * @return
     */
    @Override
    public boolean onNestedFling(CoordinatorLayout coordinatorLayout, AppBarLayout child, View target, float velocityX, float velocityY, boolean consumed) {
        if (target instanceof RecyclerView) {
            final RecyclerView recyclerView = (RecyclerView) target;
            if (scrollListenerMap.get(recyclerView) == null) {
                RecyclerViewScrollListener recyclerViewScrollListener = new RecyclerViewScrollListener(coordinatorLayout, child, this);
                scrollListenerMap.put(recyclerView, recyclerViewScrollListener);
                recyclerView.addOnScrollListener(recyclerViewScrollListener);
            }
            scrollListenerMap.get(recyclerView).setVelocity(velocityY);
            consumed = scrollListenerMap.get(recyclerView).getScrolledY() > 0; //recyclerView only consume the fling when it's not scrolled to the top
        }
        return super.onNestedFling(coordinatorLayout, child, target, velocityX, velocityY, consumed);
    }

    private static class RecyclerViewScrollListener extends RecyclerView.OnScrollListener {
        private int scrolledY;
        private boolean dragging;
        private float velocity;
        private WeakReference<CoordinatorLayout> coordinatorLayoutRef;
        private WeakReference<AppBarLayout> childRef;
        private WeakReference<CustomRecyclerScrollBehavior> behaviorWeakReference;

        public RecyclerViewScrollListener(CoordinatorLayout coordinatorLayout, AppBarLayout child, CustomRecyclerScrollBehavior barBehavior) {
            coordinatorLayoutRef = new WeakReference<>(coordinatorLayout);
            childRef = new WeakReference<>(child);
            behaviorWeakReference = new WeakReference<>(barBehavior);
        }

        @Override
        public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
            dragging = newState == RecyclerView.SCROLL_STATE_DRAGGING;
        }

        public void setVelocity(float velocity) {
            this.velocity = velocity;
        }

        public int getScrolledY() {
            return scrolledY;
        }

        @Override
        public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
            scrolledY += dy;

            if (scrolledY <= 0 && !dragging && childRef.get() != null && coordinatorLayoutRef.get() != null && behaviorWeakReference.get() != null) {
                //manually trigger the fling when it's scrolled at the top
                behaviorWeakReference.get().onNestedFling(coordinatorLayoutRef.get(), childRef.get(), recyclerView, 0, velocity, false);
            }
        }
    }
}

此类用于维护RecyclerView嵌套滚动中的滚动速度。逃离这里了

希望这对您有用！