Android NestedScrollView 不适用于 viewpager 布局
[英]Android NestedScrollView doesn't work in layout with viewpager
问题描述
This is my layout:
这是我的布局：
I want to be able to scroll upper parth of the layout (with name, image, textviews for followers/following...) when I scroll recyclerView in viewPager, so I read that I can use NestedScrollView to implement that, so I put NestedScrollView as my root layout:当我在 viewPager 中滚动 recyclerView 时，我希望能够滚动布局的上半部分（带有名称、图像、跟随者的文本视图...），所以我读到我可以使用 NestedScrollView 来实现它，所以我把 NestedScrollView作为我的根布局：
NestedScrollView:
-----------------ConstraintLayout:
---------------------------------rest of the views as in picture above
I also added android:fillViewport="true" in NEstedScrollView because that solves a broblem of missing view pager.我还在 NEstedScrollView 中添加了 android:fillViewport="true" 因为这解决了缺少视图寻呼机的问题。 So the problem is that scroll view doesn't work, everything is same as before uting nestedScrollView , bottom part of my layout doesn't scroll of the screen while I scroll recyclerView.所以问题是滚动视图不起作用，一切都与使用 nestedScrollView 之前相同，当我滚动 recyclerView 时，布局的底部不会滚动屏幕。 Doesn anyone know why, am I using nested scrollView wrong, I haven't found any example that can solve my problem and documentation is really bad.有谁知道为什么，我使用嵌套的滚动视图是否错误，我还没有找到任何可以解决我的问题的示例，而且文档非常糟糕。 XML code for my layout:我的布局的 XML 代码：
<androidx.core.widget.NestedScrollView
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:fillViewport="true">
<androidx.constraintlayout.widget.ConstraintLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.appcompat.widget.Toolbar
android:layout_width="0dp"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:theme="?attr/actionBarTheme"
android:minHeight="?attr/actionBarSize"
android:elevation="4dp"
android:id="@+id/title"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:title="UserName"
app:layout_constraintEnd_toEndOf="parent"/>
<de.hdodenhof.circleimageview.CircleImageView
android:id="@+id/profile_image"
android:layout_width="80dp"
android:layout_height="80dp"
android:layout_margin="8dp"
app:srcCompat="@drawable/ic_profile_24dp"
tools:src="@drawable/ic_profile_24dp"
app:civ_border_color="@color/primaryLightColor"
app:civ_border_width="1dp" android:layout_marginTop="8dp"
app:layout_constraintTop_toBottomOf="@+id/title" android:layout_marginStart="8dp"
app:layout_constraintStart_toStartOf="parent" android:layout_marginLeft="8dp"/>
<TextView
android:layout_width="0dp"
android:layout_height="0dp"
android:id="@+id/textView"
app:layout_constraintEnd_toEndOf="parent"
android:layout_marginEnd="8dp" android:layout_marginRight="8dp"
app:layout_constraintStart_toEndOf="@+id/profile_image" android:layout_marginLeft="8dp"
android:layout_marginStart="8dp"
app:layout_constraintBottom_toBottomOf="@+id/profile_image"
app:layout_constraintTop_toTopOf="@+id/profile_image"
tools:text="Short description "/>
<TextView
android:id="@+id/questions_label"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:gravity="center"
android:text="@string/questions"
android:layout_marginTop="8dp"
app:layout_constraintTop_toBottomOf="@+id/profile_image" app:layout_constraintStart_toStartOf="parent"
android:layout_marginLeft="8dp" android:layout_marginStart="8dp"
app:layout_constraintHorizontal_bias="0.5" app:layout_constraintEnd_toStartOf="@+id/followers_label"/>
<TextView
android:id="@+id/questions_number"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:textSize="18sp"
android:textStyle="bold"
tools:text="0"
app:layout_constraintTop_toBottomOf="@+id/questions_label"
app:layout_constraintEnd_toEndOf="@+id/questions_label"
app:layout_constraintStart_toStartOf="@+id/questions_label"/>
<TextView
android:id="@+id/followers_label"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:gravity="center"
android:text="@string/followers"
android:layout_marginTop="8dp"
app:layout_constraintTop_toBottomOf="@+id/profile_image"
app:layout_constraintStart_toEndOf="@+id/questions_label" android:layout_marginStart="8dp"
android:layout_marginLeft="8dp" android:layout_marginEnd="8dp"
app:layout_constraintEnd_toStartOf="@+id/following_label" android:layout_marginRight="8dp"
app:layout_constraintHorizontal_bias="0.5"/>
<TextView
android:id="@+id/following_label"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:gravity="center"
android:text="@string/following"
android:layout_marginTop="8dp"
app:layout_constraintTop_toBottomOf="@+id/profile_image" android:layout_marginEnd="8dp"
app:layout_constraintEnd_toEndOf="parent" android:layout_marginRight="8dp"
app:layout_constraintStart_toEndOf="@+id/followers_label" app:layout_constraintHorizontal_bias="0.5"/>
<TextView
android:id="@+id/followers_number"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:textSize="18sp"
android:textStyle="bold"
tools:text="0"
app:layout_constraintEnd_toEndOf="@+id/followers_label"
app:layout_constraintStart_toStartOf="@+id/followers_label"
app:layout_constraintTop_toBottomOf="@+id/followers_label"/>
<TextView
android:id="@+id/following_number"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:textSize="18sp"
android:textStyle="bold"
tools:text="0"
app:layout_constraintEnd_toEndOf="@+id/following_label"
app:layout_constraintStart_toStartOf="@+id/following_label"
app:layout_constraintTop_toBottomOf="@+id/following_label"/>
<com.google.android.material.tabs.TabLayout
android:id="@+id/sliding_tabs"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:background="@color/primaryLightColor"
app:tabMode="fixed" app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
android:layout_marginTop="8dp"
app:layout_constraintTop_toBottomOf="@+id/followers_number"/>
<androidx.viewpager.widget.ViewPager
android:id="@+id/view_pager"
android:layout_width="0dp"
android:layout_height="0dp"
android:background="@android:color/white"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/sliding_tabs" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.core.widget.NestedScrollView>
EDIT: code after suggestion:编辑：建议后的代码：
<?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">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<androidx.appcompat.widget.Toolbar
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:theme="?attr/actionBarTheme"
android:minHeight="?attr/actionBarSize"
android:id="@+id/title"
tools:title="UserName"/>
</com.google.android.material.appbar.AppBarLayout>
<androidx.core.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
<androidx.constraintlayout.widget.ConstraintLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<de.hdodenhof.circleimageview.CircleImageView
android:id="@+id/profile_image"
android:layout_width="80dp"
android:layout_height="80dp"
android:layout_marginStart="@dimen/spacing_normal"
android:layout_marginLeft="@dimen/spacing_normal"
android:layout_marginTop="@dimen/spacing_normal"
app:civ_border_color="@color/secondaryDarkColor"
app:civ_border_width="1dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="@drawable/ic_profile_24dp"
tools:src="@drawable/ic_profile_24dp" />
<com.google.android.material.textview.MaterialTextView
android:layout_width="0dp"
android:layout_height="0dp"
android:id="@+id/description"
android:layout_marginEnd="@dimen/spacing_normal"
android:layout_marginRight="@dimen/spacing_normal"
android:layout_marginLeft="@dimen/spacing_normal"
android:layout_marginStart="@dimen/spacing_normal"
app:layout_constraintStart_toEndOf="@+id/profile_image"
app:layout_constraintEnd_toEndOf="parent" app:layout_constraintBottom_toBottomOf="@+id/profile_image"
app:layout_constraintTop_toTopOf="@+id/profile_image"
tools:text="Short description "/>
<include
layout="@layout/qff_layout"
android:id="@+id/qff_layout"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/spacing_small"
app:layout_constraintTop_toBottomOf="@+id/profile_image"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"/>
<com.google.android.material.tabs.TabLayout
android:id="@+id/sliding_tabs"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:background="@color/primaryLightColor"
app:tabMode="fixed"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/qff_layout"/>
<androidx.viewpager.widget.ViewPager
android:id="@+id/view_pager"
android:layout_width="0dp"
android:layout_height="0dp"
android:background="@android:color/white"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/sliding_tabs" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.core.widget.NestedScrollView>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
What is wrong here, It doesn't make any sense, nothing scrolls except ViewPager这里有什么问题，没有任何意义，除了 ViewPager 没有任何滚动
4 个解决方案
解决方案1
2 已采纳 2019-09-15 08:42:50
As you know NestedScrollView has one child and the height of his child must be wrap_content if you want scroll behavior for your layout. 如您所知，NestedScrollView有一个孩子，如果您想要布局的滚动行为，则其孩子的身高必须为wrap_content 。
In your first layout, you must set the height of your ConstraintLayout to wrap_content but if you want your layout to be match_parent for whatever reason (such as you want to bound your ViewPager in the bottom of your layout) you must use suggested answer(it means you must use CoordinatorLayout ) but with the following consideration: 在第一个布局中，必须将ConstraintLayout的高度设置为wrap_content但是如果出于某种原因（例如，要将ViewPager绑定到布局的底部）希望使布局成为match_parent ，则必须使用建议的答案（表示您必须使用CoordinatorLayout ），但要考虑以下因素：
1- You should put all your stuff you want to scroll in the AppbarLayout .This layout extended from LinearLayout so you can easily put your stuff into it. 1-您应该将要滚动的所有内容放入AppbarLayout 。此布局是从LinearLayout扩展而来的，因此您可以轻松地将其放入其中。 from your question, I think you want to scroll all stuff above your ViewPager but you may change it as you want. 从您的问题来看，我认为您想将所有内容滚动到ViewPager但是您可以根据需要进行更改。
(Note: actually, I recommend using CollapsingToolbar as a child of your AppbarLAyout and then put your stuff into it but for your question, this is work perfectly too) （注意：实际上，我建议将CollapsingToolbar用作AppbarLAyout的子AppbarLAyout ，然后将其放入其中，但是对于您的问题，这也很好用）
2- Add app:layout_scrollFlags="scroll" attribute in the root of your stuff within your AppbarLayout 2-在AppbarLayout内容根目录中添加app:layout_scrollFlags="scroll"属性
3- Add app:layout_behavior="@string/appbar_scrolling_view_behavior" attribute to the sibling of your AppbarLayout . 3-添加app:layout_behavior="@string/appbar_scrolling_view_behavior"属性到你的兄弟姐妹AppbarLayout 。 In your question, you use this attribute in your NestedScrollView . 在您的问题中，可以在NestedScrollView使用此属性。
This is my code: 这是我的代码：
<?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">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<androidx.appcompat.widget.Toolbar
app:layout_scrollFlags="scroll"//I forget too add this, so I edit my answer
android:id="@+id/title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:minHeight="?attr/actionBarSize"
android:theme="?attr/actionBarTheme" />
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_scrollFlags="scroll"
android:orientation="vertical">
<View
android:id="@+id/profile_image"
android:layout_width="80dp"
android:layout_height="80dp"
android:layout_marginStart="10dp"
android:layout_marginLeft="10dp"
android:layout_marginTop="10dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<com.google.android.material.textview.MaterialTextView
android:id="@+id/description"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginStart="@dimen/spacing_normal"
android:layout_marginLeft="@dimen/spacing_normal"
android:layout_marginEnd="@dimen/spacing_normal"
android:layout_marginRight="@dimen/spacing_normal"
app:layout_constraintBottom_toBottomOf="@+id/profile_image"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="@+id/profile_image"
app:layout_constraintTop_toTopOf="@+id/profile_image"
tools:text="Short description " />
<include
layout="@layout/qff_layout"
android:id="@+id/qff_layout"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/profile_image" />
<com.google.android.material.tabs.TabLayout
android:id="@+id/sliding_tabs"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:background="#559735"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/qff_layout"
app:tabMode="fixed" />
</androidx.constraintlayout.widget.ConstraintLayout>
</com.google.android.material.appbar.AppBarLayout>
<androidx.core.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
<androidx.viewpager.widget.ViewPager
android:id="@+id/view_pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/white"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/sliding_tabs" />
</androidx.core.widget.NestedScrollView>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
I didn't try this code but I'm pretty sure this is work for you :) 我没有尝试过这段代码，但是我很确定这对您有用:)
解决方案2
0 2019-09-06 09:54:44
在NestedScrollView中放
app:layout_behavior="@string/appbar_scrolling_view_behavior"
解决方案3
0 2019-09-11 04:28:27
Have you tried this one : 您是否尝试过这个：
<CoordinatorLayout>
...<AppbarLayout>
......<Toolbar/>
...</AppbarLayout>
...<NestedScrollView> (set height and weight to match parent, then set fillViewPort="true" and for the last give layout_behavior="@string/appbar_scrolling_view_behavior")
......<ConstraintLayout> (change height to wrap_content because you don't need to set match parent, its already handled by nestedscrollview as a parent)
.........(All Child Components)
......</ConstraintLayout>
...</NestedScrollView>
</CoordinatorLayout>
From official documentation FillViewPort as an NestedScrollView Attributes is to stretch content's height to the viewport boundaries. 根据官方文档，FillViewPort作为NestedScrollView的属性是将内容的高度扩展到视口边界。 Please check official document for better explanation : NestedScrollView - FillViewPort 请检查官方文档以获取更好的解释： NestedScrollView-FillViewPort
UPDATE : Based on your current code I make some change, please check it. 更新：根据您当前的代码，我进行了一些更改，请检查一下。
<?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">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<androidx.appcompat.widget.Toolbar
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:theme="?attr/actionBarTheme"
android:minHeight="?attr/actionBarSize"
android:id="@+id/title"
tools:title="UserName"/>
</com.google.android.material.appbar.AppBarLayout>
<androidx.core.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<de.hdodenhof.circleimageview.CircleImageView
android:id="@+id/profile_image"
android:layout_width="80dp"
android:layout_height="80dp"
android:layout_marginStart="@dimen/spacing_normal"
android:layout_marginLeft="@dimen/spacing_normal"
android:layout_marginTop="@dimen/spacing_normal"
app:civ_border_color="@color/secondaryDarkColor"
app:civ_border_width="1dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="@drawable/ic_profile_24dp"
tools:src="@drawable/ic_profile_24dp" />
<com.google.android.material.textview.MaterialTextView
android:layout_width="0dp"
android:layout_height="0dp"
android:id="@+id/description"
android:layout_marginEnd="@dimen/spacing_normal"
android:layout_marginRight="@dimen/spacing_normal"
android:layout_marginLeft="@dimen/spacing_normal"
android:layout_marginStart="@dimen/spacing_normal"
app:layout_constraintStart_toEndOf="@+id/profile_image"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintBottom_toBottomOf="@+id/profile_image"
app:layout_constraintTop_toTopOf="@+id/profile_image"
tools:text="Short description "/>
<include
layout="@layout/qff_layout"
android:id="@+id/qff_layout"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/spacing_small"
app:layout_constraintTop_toBottomOf="@+id/profile_image"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"/>
<com.google.android.material.tabs.TabLayout
android:id="@+id/sliding_tabs"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:background="@color/primaryLightColor"
app:tabMode="fixed"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/qff_layout"/>
<androidx.viewpager.widget.ViewPager
android:id="@+id/view_pager"
android:layout_width="0dp"
android:layout_height="0dp"
android:background="@android:color/white"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/sliding_tabs" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.core.widget.NestedScrollView>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
解决方案4
0 2019-09-12 05:00:50
Your content fit in your display area. 您的内容适合您的显示区域。 that's why it happened. 这就是它发生的原因。 For that, you have to set fix height of your ViewPager. 为此，您必须设置ViewPager的固定高度。 After that your whole layout scroll. 之后，整个布局滚动。 But this is not a proper solution. 但这不是一个适当的解决方案。
Example 例
set ViewPager height 500dp and check it.
解决方案5
0 2019-09-13 00:11:36
I used HorizontalScrollView as a container for the upper layout: 我将HorizontalScrollView用作上部布局的容器：
<ConstraintLayout>
<Toolbar/>
<HorizontalScrollView>
<ConstraintLayout android:id="@+id/top_container">
<!-- your upper widgets here -->
</ConstraintLayout>
</HorizontalScrollView>
<TabLayout/>
<ViewPager/>
</ConstraintLayout>
When the user scrolls the ViewPager , it callbacks the ViewPager.OnPageChangeListener.onPageScrolled() . 当用户滚动ViewPager ，它将回调ViewPager.OnPageChangeListener.onPageScrolled（） 。 You can override it to programmatically scroll the upper layout by HorizontalScrollView.setScrollX() method, inherited from the base View class: 您可以重写它，以通过HorizontalScrollView.setScrollX（）方法以编程方式滚动上部布局，该方法继承自基本View类：
class ScrollListener implements ViewPager.OnPageChangeListener {
private ViewGroup scrollView;
ScrollListener(ViewGroup scrollView) {
this.scrollView = scrollView;
}
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
scrollView.setScrollX(scrollView.getWidth() * position + positionOffsetPixels);
}
// the interface requires to override 2 more methods:
@Override
public void onPageSelected(int position) {}
@Override
public void onPageScrollStateChanged(int state) {}
}
Then in the MainActivity you have to set this Listener to the ViewPager by ViewPager.addOnPageChangeListener() : 然后在MainActivity ，必须通过ViewPager.addOnPageChangeListener（）将此侦听器设置为ViewPager ：
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ViewGroup scrollView = findViewById(R.id.top_scroll);
ViewPager viewPager = findViewById(R.id.view_pager);
viewPager.addOnPageChangeListener(new ScrollListener(scrollView));
viewPager.setAdapter(new MyAdapter(getApplicationContext(), 3));
}
Notice: This code will compact the upper layout, because HorizontalScrollView don't use screen bounds to measure and to layout. 注意：此代码将压缩上部布局，因为HorizontalScrollView不使用屏幕边界进行度量和布局。 Thus, it allows you to put widgets off the screen ( screenshot ) and gives the ability to scroll. 因此，它允许您将小部件置于屏幕之外（ 屏幕截图 ），并具有滚动功能。
In your case there are no widgets off the screen, so you won't see the result, because there's nothing to scroll. 在您的情况下，屏幕上没有小部件，因此您不会看到结果，因为没有任何可滚动的内容。 For the test, I added a couple of lines in MainActivity to stretch the upper layout: 为了进行测试，我在MainActivity添加了几行以拉伸上部布局：
Point size = new Point();
getWindowManager().getDefaultDisplay().getSize(size);
ConstraintLayout upperLayout = findViewById(R.id.top_container);
upperLayout .setMinWidth(size.x + 400);
My git source code example : link (there I removed scroll by touch for upper layout) 我的git源代码示例 ： 链接 （我通过触摸移除了滚动的上部布局）
Hope this helps, good luck! 希望这有帮助，祝你好运！
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