当我在Android Studio的constraintlayout中使用spread_inside时，还有一个静态空间吗？

我使用带有布局a的土地布局，我为4个图像按钮设置了

app:layout\u constraintvertic\u chainStyle=“spread\u inside”

但我发现有一个静止的空间，你可以看到图像a

顺便说一句，当我使用

app:layout\u constraintvertic\u chainStyle=“spread”

还有更多：

如果我使用布局B的垂直布局，我发现没有空间，你可以看到图像B

使用布局A时如何删除空间

布局A

<androidx.constraintlayout.widget.ConstraintLayout
        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:id="@+id/camera_ui_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent">


    <ImageButton
            android:id="@+id/btnFlash"
            android:layout_width="@dimen/round_button_medium"
            android:layout_height="@dimen/round_button_medium"
            android:layout_marginBottom="@dimen/margin_xsmall"
            android:layout_marginRight="@dimen/margin_medium"
            android:background="@android:color/transparent"
            android:scaleType="fitCenter"

            app:layout_constraintVertical_chainStyle="spread_inside"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/btnVideo"
            app:srcCompat="@drawable/ic_flash_on" />

    <ImageButton
            android:id="@+id/btnVideo"
            android:layout_width="@dimen/round_button_medium"
            android:layout_height="@dimen/round_button_medium"
            android:layout_marginRight="@dimen/margin_medium"
            android:background="@android:color/transparent"
            android:scaleType="fitCenter"

            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintBottom_toTopOf="@+id/btnFlash"
            app:layout_constraintTop_toBottomOf="@+id/btnPicture"
            app:srcCompat="@drawable/ic_menu" />


    <ImageButton
            android:id="@+id/btnPicture"
            android:layout_width="@dimen/round_button_medium"
            android:layout_height="@dimen/round_button_medium"
            android:layout_marginRight="@dimen/margin_medium"
            android:background="@android:color/transparent"
            android:scaleType="fitCenter"

            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintBottom_toTopOf="@+id/btnVideo"
            app:layout_constraintTop_toBottomOf="@+id/btnAction"
            app:srcCompat="@drawable/ic_menu" />

    <ImageButton
            android:id="@+id/btnAction"
            android:layout_width="@dimen/round_button_medium"
            android:layout_height="@dimen/round_button_medium"

            android:layout_marginTop="@dimen/margin_xsmall"
            android:layout_marginRight="@dimen/margin_medium"
            android:background="@android:color/transparent"
            android:scaleType="fitCenter"

            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintBottom_toTopOf="@+id/btnPicture"

            app:srcCompat="@drawable/ic_menu" />

</androidx.constraintlayout.widget.ConstraintLayout>

布局B

<androidx.constraintlayout.widget.ConstraintLayout
        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:id="@+id/camera_ui_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    <ImageButton
            android:id="@+id/btnFlash"
            android:layout_width="@dimen/round_button_medium"
            android:layout_height="@dimen/round_button_medium"
            android:layout_marginLeft="@dimen/margin_xsmall"
            android:layout_marginBottom="@dimen/margin_medium"
            android:background="@android:color/transparent"
            android:scaleType="fitCenter"

            app:layout_constraintHorizontal_chainStyle="spread_inside"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toLeftOf="@+id/btnVideo"
            app:srcCompat="@drawable/ic_flash_on" />

    <ImageButton
            android:id="@+id/btnVideo"
            android:layout_width="@dimen/round_button_medium"
            android:layout_height="@dimen/round_button_medium"
            android:layout_marginBottom="@dimen/margin_medium"
            android:background="@android:color/transparent"
            android:scaleType="fitCenter"

            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintLeft_toRightOf="@+id/btnFlash"
            app:layout_constraintRight_toLeftOf="@+id/btnPicture"
            app:srcCompat="@drawable/ic_menu" />


    <ImageButton
            android:id="@+id/btnPicture"
            android:layout_width="@dimen/round_button_medium"
            android:layout_height="@dimen/round_button_medium"
            android:layout_marginBottom="@dimen/margin_medium"
            android:background="@android:color/transparent"
            android:scaleType="fitCenter"

            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintLeft_toRightOf="@+id/btnVideo"
            app:layout_constraintRight_toLeftOf="@+id/btnAction"
            app:srcCompat="@drawable/ic_menu" />

    <ImageButton
            android:id="@+id/btnAction"
            android:layout_width="@dimen/round_button_medium"
            android:layout_height="@dimen/round_button_medium"
            android:layout_marginRight="@dimen/margin_xsmall"
            android:layout_marginBottom="@dimen/margin_medium"
            android:background="@android:color/transparent"
            android:scaleType="fitCenter"

            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintLeft_toRightOf="@+id/btnPicture"
            app:srcCompat="@drawable/ic_menu" />

</androidx.constraintlayout.widget.ConstraintLayout>


从顶部和底部删除页边距


应在链的第一个元素上设置
app:layout\u constraintvertic\u chainStyle
属性。在垂直链中，它是从顶部开始的第一个元素，因此应该将“链样式”属性从
btnFlash
移动到
btnAction

在布局B中，它按预期工作，因为您已正确设置了左侧第一个链接视图的属性。
谢谢！但我在land layout中放置了类似的代码，效果很好。而且，当我将代码中的
app:layout\u constraintVertical\u chainStyle=“spread\u inside”
替换为
app:layou constraintVertical\u chainStyle=“packed”
时，UI是相同的。
 <?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/camera_ui_container"
    android:layout_width="match_parent"
    android:layout_height="match_parent">


    <ImageButton
        android:id="@+id/btnFlash"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_marginEnd="@dimen/margin_medium"
        android:background="@android:color/transparent"
        android:scaleType="fitCenter"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/btnVideo"
        app:layout_constraintVertical_chainStyle="spread_inside"
        app:srcCompat="@drawable/ic_need_it" />

    <ImageButton
        android:id="@+id/btnVideo"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_marginEnd="@dimen/margin_medium"
        android:background="@android:color/transparent"
        android:scaleType="fitCenter"
        app:layout_constraintBottom_toTopOf="@+id/btnFlash"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/btnPicture"
        app:srcCompat="@drawable/ic_like_gray" />


    <ImageButton
        android:id="@+id/btnPicture"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_marginEnd="@dimen/margin_medium"
        android:background="@android:color/transparent"
        android:scaleType="fitCenter"
        app:layout_constraintBottom_toTopOf="@+id/btnVideo"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/btnAction"
        app:srcCompat="@drawable/ic_in_love" />

    <ImageButton
        android:id="@+id/btnAction"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_marginEnd="@dimen/margin_medium"
        android:background="@android:color/transparent"
        android:scaleType="fitCenter"
        app:layout_constraintBottom_toTopOf="@+id/btnPicture"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:srcCompat="@drawable/ic_got_it" />

</androidx.constraintlayout.widget.ConstraintLayout>