Question

创建NestedScrollView后，只要正确执行NestedScrollingChild和NestedScrollingParent，您就可以将滚动视图放在另一个滚动视图中。

（这是一个不错的设计模式＆＃34; Ian Lake（来自Google）实际上建议在这里将RecyclerView置于nestedscrollview中：plus.google.com/u/0/+AndroidDevelopers/posts/9kZ3SsXdT2T& ＃34;）

我想将RecyclerView放在NestedScrollView内，幸运的是RecyclerView实现了NestedScrollingChild，因此您可以将其放在NestedScrollView内。

public class RecyclerView extends ViewGroup implements ScrollingView, NestedScrollingChild

我已阅读这些帖子：

How to use RecyclerView inside NestedScrollView?

NestedScrolling with NestedScrollView, RecyclerView (Horizontal), inside a CoordinatorLayout

但是大多数投票解决方案的问题是，它调用RecyclerView的所有项目，例如，如果它是无尽的RecyclerView，当用户到达列表的末尾时，您想要发出网络请求然后使用该解决方案RecyclerView重复调用服务器，因为它会自动到达RecyclerView的最后一项。

无论如何，如何设置参数以便我可以将RecyclerView放在NestedScrollView内。（实际上我想把一个像framelayout或relativelayout这样的视图组作为nestedscrollview的单个childe然后我想放置recyclerview在framelayout或relativelayout内）

当我将RecyclerView放在NestedScrollView内时，无法显示任何内容。

要创建示例项目，您可以使用cheesesquare并更改CheeseDetailActivity以使用RecyclerView。

虽然BNK的答案不正确，但BNK已经尝试了很多。所以我授予他赏金。仍在寻找好的解决方案....

Answer 1

以下是我最新的答案：

<android.support.v4.widget.NestedScrollView
        android:id="@+id/scrollview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fillViewport="true"
        app:layout_behavior="@string/appbar_scrolling_view_behavior">

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <android.support.v7.widget.CardView
                android:id="@+id/cardview1"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_margin="@dimen/card_margin">

                <LinearLayout
                    style="@style/Widget.CardContent"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content">

                    <TextView
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:text="Info CardView1"
                        android:textAppearance="@style/TextAppearance.AppCompat.Title" />

                    <TextView
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:text="@string/cheese_ipsum" />

                </LinearLayout>

            </android.support.v7.widget.CardView>

            <android.support.v7.widget.CardView
                android:id="@+id/cardview2"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_below="@+id/cardview1"
                android:layout_margin="@dimen/card_margin">

                <LinearLayout
                    style="@style/Widget.CardContent"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content">

                    <TextView
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:text="Info CardView2"
                        android:textAppearance="@style/TextAppearance.AppCompat.Title" />

                    <TextView
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:text="@string/cheese_ipsum" />

                </LinearLayout>

            </android.support.v7.widget.CardView>

            <android.support.v7.widget.RecyclerView
                android:id="@+id/recyclerview"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_below="@+id/cardview2"
                android:clipToPadding="false"
                android:paddingTop="0dp"/>

        </RelativeLayout>

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

活动：

        RecyclerViewAdapter recyclerViewAdapter = new RecyclerViewAdapter(true); // true: with header
        RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerview);            
        final MyLinearLayoutManager layoutManager = new MyLinearLayoutManager(this, LinearLayoutManager.VERTICAL, false, getScreenHeight(this));
        // final CustomLinearLayoutManager layoutManager = new CustomLinearLayoutManager(this, LinearLayoutManager.VERTICAL, false);
        recyclerView.setLayoutManager(layoutManager);
        recyclerView.setAdapter(recyclerViewAdapter);  
        // recyclerView.setNestedScrollingEnabled(false); // Disables scrolling for RecyclerView, however, CustomLinearLayoutManager used instead of MyLinearLayoutManager

我还更新为My GitHub's sample project

截图：

Answer 2

以下是仅在您真正需要加载更多数据时才调用服务器的解决方案。通过这种方式，您可以在NestedScrollView中放置无尽的RecyclerView和许多其他视图。对我而言，它运作良好。

1。创建 EndlessParentScrollListener 类以处理来自NestedSrollView的滚动事件。

public abstract class EndlessParentScrollListener implements NestedScrollView.OnScrollChangeListener {
        // The current offset index of data you have loaded
        private int currentPage = 0;
        // The total number of items in the dataset after the last load
        private int previousTotalItemCount = 0;
        // True if we are still waiting for the last set of data to load.
        private boolean loading = true;
        // Sets the starting page index
        private int startingPageIndex = 0;
        // The minimum amount of pixels to have below your current scroll position
        // before loading more.
        private int visibleThresholdDistance = 300;

        RecyclerView.LayoutManager mLayoutManager;

        public EndlessParentScrollListener(RecyclerView.LayoutManager layoutManager) {
            this.mLayoutManager = layoutManager;
        }

        @Override
        public void onScrollChange(NestedScrollView scrollView, int x, int y, int oldx, int oldy) {
            // We take the last son in the scrollview
            View view = scrollView.getChildAt(scrollView.getChildCount() - 1);
            int distanceToEnd = (view.getBottom() - (scrollView.getHeight() + scrollView.getScrollY()));

            int totalItemCount = mLayoutManager.getItemCount();
            // If the total item count is zero and the previous isn't, assume the
            // list is invalidated and should be reset back to initial state
            if (totalItemCount < previousTotalItemCount) {
                this.currentPage = this.startingPageIndex;
                this.previousTotalItemCount = totalItemCount;
                if (totalItemCount == 0) {
                    this.loading = true;
                }
            }

            // If it’s still loading, we check to see if the dataset count has
            // changed, if so we conclude it has finished loading and update the current page
            // number and total item count.
            if (loading && (totalItemCount > previousTotalItemCount)) {
                loading = false;
                previousTotalItemCount = totalItemCount;
            }

            // If it isn’t currently loading, we check to see if we have breached
            // the visibleThreshold and need to reload more data.
            // If we do need to reload some more data, we execute onLoadMore to fetch the data.
            // threshold should reflect how many total columns there are too
            if (!loading && distanceToEnd <= visibleThresholdDistance) {
                currentPage++;
                onLoadMore(currentPage, totalItemCount);
                loading = true;
            }
        }

        // Defines the process for actually loading more data based on page
        public abstract void onLoadMore(int page, int totalItemsCount);
    }

2. 设置侦听器

private void initRecycler() {  
        //TODO init recycler adapter here

        recycler.setNestedScrollingEnabled(false);          
        LinearLayoutManager _layoutManager = new LinearLayoutManager(this);
        recycler.setLayoutManager(_layoutManager);
        NestedScrollView scrollView = (NestedScrollView) findViewById(R.id.scrollView);
        scrollView.setOnScrollChangeListener(new EndlessParentScrollListener(_layoutManager) {
                @Override
                public void onLoadMore(int page, int totalItemsCount) {                     
                    if (loadedItemCount < serverItemsCount)
                        customLoadMoreDataFromApi();
                }
            });
        customLoadMoreDataFromApi();
    }

如果有人发现它有用，请使用短xml：

<android.support.design.widget.CoordinatorLayout 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:background="@android:color/background_light"
        android:fitsSystemWindows="true">


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

        <android.support.v4.widget.NestedScrollView
            android:id="@+id/scrollView"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:fitsSystemWindows="true"
            android:scrollbars="vertical"
            android:scrollbarAlwaysDrawVerticalTrack="true"
            app:layout_behavior="@string/appbar_scrolling_view_behavior">

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

                <!-- some views goes here-->

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

                <!-- and possibly here-->

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

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

Answer 3

所以直接将RecyclerView直接放在NestedScrollView中会遗憾地显示任何内容。但是，有一种方法可以将recyclerview间接放入NestedScrollView中 - 只需使用frameLayout作为第三方来保存您的recyclerview。

这是framelayout，它在活动类中保存嵌套的recyclerview：

    <FrameLayout
        android:id="@+id/container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fitsSystemWindows="true"
        tools:context=".ExampleFragment"
        app:layout_behavior="@string/appbar_scrolling_view_behavior">

        <android.support.v4.widget.NestedScrollView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:fillViewport="true"
            >
        </android.support.v4.widget.NestedScrollView>
   </FrameLayout>

将您的片段放入 framelayout （代码位于活动类中）：

 ExampleFragment exampleFragment = new ExampleFragment();

    FragmentManager fm = getSupportFragmentManager();
    FragmentTransaction ft = fm.beginTransaction();
    ft.add(R.id.container, exampleFragment);
    ft.commit();

在 exampleFragment 中，您可以放置您的recyclerview。

<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/post_container"
        android:background="#E0E0E0">

            <android.support.v7.widget.RecyclerView
                android:id="@+id/my_recycler_view"
                android:scrollbars="vertical"

                android:layout_width="match_parent"
                android:layout_height="match_parent">
            </android.support.v7.widget.RecyclerView>


    </RelativeLayout>

这是片段代码：

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {

    super.onCreateView(inflater, container, savedInstanceState);
            llLayout = (RelativeLayout) inflater.inflate(R.layout.example_fragment_layout, container, false);
                    mRecyclerView = (RecyclerView) llLayout.findViewById(R.id.my_recycler_view);

以下是您应该拥有的 CheeseSquare XML布局：

<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:fitsSystemWindows="true">

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

        <android.support.design.widget.CollapsingToolbarLayout
            android:id="@+id/collapsing_toolbar"
            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">

            <ImageView
                android:id="@+id/backdrop"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:scaleType="centerCrop"
                android:fitsSystemWindows="true"
                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>

   <FrameLayout
        android:id="@+id/container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fitsSystemWindows="true"
        tools:context=".ExampleFragment"
        app:layout_behavior="@string/appbar_scrolling_view_behavior">

        <android.support.v4.widget.NestedScrollView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:fillViewport="true"
            >
        </android.support.v4.widget.NestedScrollView>
   </FrameLayout>

    <android.support.design.widget.FloatingActionButton
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        app:layout_anchor="@id/appbar"
        app:layout_anchorGravity="bottom|right|end"
        android:src="@drawable/ic_discuss"
        android:layout_margin="@dimen/fab_margin"
        android:clickable="true"/>

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

Answer 4

我已经浪费了至少一个星期的时间，唯一可行的解决方案是删除nestedscrollview。我知道这不是在recyclerview内添加nestedscrollview的特定问题的答案，但要使recyclerview实际回收视图，您必须删除 nestedscrollview。如果您碰巧内部有多个view而不是recyclerview，则必须通过设置不同的观看者，然后添加

将它们添加为recyclerview的项。

app:layout_behavior="@string/appbar_scrolling_view_behavior"

到recyclerview或recyclerview的父级（父级除了Recyclerview之外，没有其他任何视图可以正常工作）。

在我的情况下，要求如下：

  <androidx.coordinatorlayout.widget.CoordinatorLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:fitsSystemWindows="true"
        app:layout_constraintTop_toTopOf="parent">

        <!-- Scrollable view here -->

        <com.google.android.material.appbar.AppBarLayout
            ....   >

            <com.google.android.material.appbar.CollapsingToolbarLayout
                ....>

                <androidx.appcompat.widget.Toolbar
                    ....>

                    <include
                        android:id="@+id/toolbar_header_view"
                        .... />
                </androidx.appcompat.widget.Toolbar>

                <include layout="@layout/widget_header" />
            </com.google.android.material.appbar.CollapsingToolbarLayout>
        </com.google.android.material.appbar.AppBarLayout>

        <androidx.swiperefreshlayout.widget.SwipeRefreshLayout
            ....>
            <LinearLayout orientation="vertical" ....>
                <View .../>  <!-- I needed to have these two views along with recyclerview and i wanted them to do nestedscroll along with recyclerview -->
                <View .../>
                <androidx.recyclerview.widget.RecyclerView
                .... />
        </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>
    </androidx.coordinatorlayout.widget.CoordinatorLayout>
</androidx.constraintlayout.widget.ConstraintLayout>

我需要在recyclerview之前有两个视图，我希望它们与recyclerview一起进行嵌套滚动。唯一有效的方法是将它们删除到视图中并将它们添加为recyclerview的前两项，然后添加

app:layout_behavior="@string/appbar_scrolling_view_behavior"

转到swipetorefresh布局

希望这对某人有帮助。如果需要，我将添加更多信息。

如何将RecyclerView放入NestedScrollView中？

4 个答案: