Android Studio中4个图像按钮的两个ConstraintLayout有什么不同?

我用 约束布局 在我的Android项目中,我在UI中放置了四个图像按钮,我希望四个图像按钮之间的距离相等,似乎两者都一样 布局A 和 布局B 图像AB

两者有什么不同 ?

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_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>

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_constraintBottom_toBottomOf="parent"
            app:layout_constraintHorizontal_chainStyle="spread_inside"
            app:layout_constraintLeft_toLeftOf="parent"
            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:srcCompat="@drawable/ic_menu" />



</androidx.constraintlayout.widget.ConstraintLayout>

图像AB