Android 约束布局在底部有额外的空间

我正在实现一个在滚动视图内部使用约束布局的视图。我正在尝试使用

app:layout\u constraint bottom\u toBottomOf=“parent

将视图与父视图底部对齐，但是正如您在图片中所看到的，我的视图下方有额外的空白。蓝色视图下方的空白。有人可以指导我如何删除底部的额外空白。提前感谢

这是密码

<android.support.constraint.ConstraintLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ScrollView
        android:id="@+id/scrollView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:requiresFadingEdge="vertical"
        android:fadingEdgeLength="90dp"
        android:fadingEdge="vertical"
        android:fillViewport="true"
        >

        <android.support.constraint.ConstraintLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            >

            <ImageView
                android:id="@+id/image"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:minHeight="275dp"
                android:scaleType="center"
                android:src="@drawable/bubble_exclaimation"
                app:layout_constraintBottom_toTopOf="@id/content_layout"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintRight_toRightOf="parent"
                app:layout_constraintTop_toTopOf="parent" />

            <android.support.constraint.ConstraintLayout
                android:id="@+id/content_layout"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintTop_toBottomOf="@+id/image"
                android:background="@android:color/holo_blue_dark"
                android:paddingBottom="15dp"
                >

                <TextView
                    android:id="@+id/title"
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:text="@string/title"
                    android:textSize="17sp"
                    app:layout_constraintBottom_toTopOf="@+id/body"
                    app:layout_constraintLeft_toLeftOf="@+id/left_guideline"
                    app:layout_constraintRight_toLeftOf="@+id/right_guideline"
                    app:layout_constraintTop_toBottomOf="parent" />

                <TextView
                    android:id="@+id/body"
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="13dp"
                    android:text="@string/content_small"
                    android:textSize="12sp"
                    app:layout_constraintLeft_toLeftOf="@+id/left_guideline"
                    app:layout_constraintRight_toLeftOf="@+id/right_guideline"
                    app:layout_constraintTop_toBottomOf="@+id/title" />

                <android.support.constraint.Guideline
                    android:id="@+id/left_guideline"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:orientation="vertical"
                    app:layout_constraintGuide_percent="0.11" />

                <android.support.constraint.Guideline
                    android:id="@+id/right_guideline"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:orientation="vertical"
                    app:layout_constraintGuide_percent="0.89" />
            </android.support.constraint.ConstraintLayout>

        </android.support.constraint.ConstraintLayout>


    </ScrollView>

    <View
        android:id="@+id/block"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_marginTop="10dp"
        android:background="@android:color/holo_blue_dark"
        app:layout_constraintTop_toBottomOf="@id/scrollView"
        app:layout_constraintBottom_toBottomOf="parent"
        />

</android.support.constraint.ConstraintLayout>

从
android:id=“@+id/content\u layout”中删除
app:layout\u constrainttoop\u toBottomOf=“@+id/image”


为什么在编写
layout\u constraintBottom\u toBottomOf=“parent
或
layout\u constrainttoop\u tototopof=“parent
”时会发生这种情况？@mj使用这两个属性，将内容对齐到中心，就像相对布局一样，对齐\u botton和对齐\u顶部是视图，将内容包裹到屏幕中心对齐
 <?xml version="1.0" encoding="utf-8"?>
    <android.support.constraint.ConstraintLayout 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">


        <ScrollView
            android:id="@+id/scrollView"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:fadingEdge="vertical"
            android:fadingEdgeLength="90dp"
            android:fillViewport="true"
            android:requiresFadingEdge="vertical">

            <android.support.constraint.ConstraintLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content">

                <ImageView
                    android:id="@+id/image"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:minHeight="275dp"
                    android:scaleType="center"
                    android:src="@drawable/bubble_exclaimation"
                    app:layout_constraintBottom_toTopOf="@id/content_layout"
                    app:layout_constraintLeft_toLeftOf="parent"
                    app:layout_constraintRight_toRightOf="parent"
                    app:layout_constraintTop_toTopOf="parent" />

                <android.support.constraint.ConstraintLayout
                    android:id="@+id/content_layout"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:background="@android:color/holo_blue_dark"
                    android:paddingBottom="15dp"
                    app:layout_constraintBottom_toBottomOf="parent">

                    <TextView
                        android:id="@+id/title"
                        android:layout_width="0dp"
                        android:layout_height="wrap_content"
                        android:text="@string/title"
                        android:textSize="17sp"
                        app:layout_constraintBottom_toTopOf="@+id/body"
                        app:layout_constraintLeft_toLeftOf="@+id/left_guideline"
                        app:layout_constraintRight_toLeftOf="@+id/right_guideline"
                        app:layout_constraintTop_toBottomOf="parent" />

                    <TextView
                        android:id="@+id/body"
                        android:layout_width="0dp"
                        android:layout_height="wrap_content"
                        android:layout_marginTop="13dp"
                        android:text="@string/content_small"
                        android:textSize="12sp"
                        app:layout_constraintLeft_toLeftOf="@+id/left_guideline"
                        app:layout_constraintRight_toLeftOf="@+id/right_guideline"
                        app:layout_constraintTop_toBottomOf="@+id/title" />

                    <android.support.constraint.Guideline
                        android:id="@+id/left_guideline"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:orientation="vertical"
                        app:layout_constraintGuide_percent="0.11" />

                    <android.support.constraint.Guideline
                        android:id="@+id/right_guideline"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:orientation="vertical"
                        app:layout_constraintGuide_percent="0.89" />
                </android.support.constraint.ConstraintLayout>

            </android.support.constraint.ConstraintLayout>


        </ScrollView>

        <View
            android:id="@+id/block"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_marginTop="10dp"
            android:background="@android:color/holo_blue_dark"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintTop_toBottomOf="@id/scrollView" />


    </android.support.constraint.ConstraintLayout>