Android Studio预览混乱，视图的边距不一致

Question

为什么Android Studio Preview与实际应用相比如此混乱？尽管在各个方面都受到限制，但其中一种观点仍然飞到角落。

我的问题的第二部分/第三部分是：为什么在我的应用程序中，第二个分隔符“ divider2”与单元1名称的底部之间有很大的空白？而且，为什么单元2设置和第二个分频器之间会有很大的余量？那里以前有30像素的边距，但现在不存在，因此不应该存在。

更多诊断信息：如果同时从unit2SpecialMod和unit2ShieldsUps元素中删除app：layout_constraintHeight_max =“ 40dp”，则预览将看起来像实际的应用程序。

还有，第四部分，为什么在预览中尽管视图被扔到了角落，但边距实际上仍然是正确的，至少在删除此行之前，为什么它们会变得不正确，就像显示实际的应用程序一样，一旦删除这条线？

屏幕截图：

This is a screenshot of the actual app, and you can see the weird margins

This is a screenshot of the android studio preview and you can see the weird view in the corner, which is Unit 2 Special Mod, "unit2SpecialMod"

这是有问题的xml文件，有点长：

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:tools="http://schemas.android.com/tools"
    tools:context="com.Icantbelievedefaultisexample.nistic.starcraft2unitcollider.UnitVUnit"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <include
        android:id="@+id/activity_main_include"
        layout="@layout/activity_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/battlePreview"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:text="Battle Preview"
        android:padding="4dp"
        android:textAlignment="center"
        android:textSize="19dp"
        android:textStyle="italic|bold"
        android:background="@color/deepPurple"
        app:layout_constraintHeight_percent="0.05"
        android:textColor="@color/white"
        app:layout_constraintTop_toTopOf="parent"
        />

    <ImageButton
        android:id="@+id/iconButton1"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginTop="8dp"
        android:layout_marginStart="4dp"
        android:layout_marginLeft="4dp"
        android:text="Unit 1"
        android:background="@drawable/ic_zoom_in_black_24dp"
        android:backgroundTint="@color/grayGreen"
        app:layout_constraintTop_toBottomOf="@id/battlePreview"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintWidth_percent="0.1"
        app:layout_constraintDimensionRatio="1:1"
        app:layout_constraintHeight_max="60dp"
        app:layout_constraintBottom_toTopOf="@id/iconButton2"
        app:layout_constraintEnd_toStartOf="@id/instructions"
        app:layout_constraintVertical_bias="0"
        app:layout_constraintHorizontal_bias=".5"
        app:layout_constraintWidth_max="60dp"/>

    <TextView
        android:id="@+id/instructions"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:background="@drawable/text_view_corners"
        android:gravity="center"
        android:text=" Unit 1"
        android:textAlignment="center"
        android:textColor="@color/white"
        android:textSize="14sp"
        android:textStyle="bold"
        android:maxWidth="315dp"
        android:paddingStart="8dp"
        android:paddingLeft="8dp"
        app:layout_constraintVertical_bias="0.0"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/battlePreview"
        app:layout_constraintWidth_percent=".73"
        app:layout_constraintHeight_percent=".06" />

    <TextView
        android:id="@+id/Vs"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginTop="0dp"
        android:layout_marginBottom="0dp"
        android:background="@drawable/text_view_corners"
        android:gravity="center_vertical"
        android:padding="8dp"
        android:text="Vs"
        android:textAlignment="center"
        android:textColor="@color/white"
        android:textSize="18sp"
        android:textStyle="bold"
        app:layout_constraintBottom_toTopOf="@+id/unit1SpecialMod"
        app:layout_constraintDimensionRatio="1:1"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHeight_max="70dp"
        app:layout_constraintHorizontal_bias=".5"
        app:layout_constraintVertical_bias=".5"
        app:layout_constraintStart_toEndOf="@+id/instructions"
        app:layout_constraintTop_toBottomOf="@id/battlePreview"
        app:layout_constraintWidth_percent=".11"
        app:layout_constraintWidth_max="70dp"/>

    <ImageButton
        android:id="@+id/iconButton2"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginTop="4dp"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:text="Unit 2"
        android:background="@drawable/ic_zoom_in_black_24dp"
        android:backgroundTint="@color/grayGreen"
        app:layout_constraintTop_toBottomOf="@id/iconButton1"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toStartOf="@id/instructions"
        app:layout_constraintWidth_percent="0.1"
        app:layout_constraintDimensionRatio="1:1"
        app:layout_constraintHeight_max="60dp"
        app:layout_constraintVertical_bias="0"
        app:layout_constraintBottom_toTopOf="@id/divider1"
        app:layout_constraintWidth_max="60dp"/>

    <TextView
        android:id="@+id/instructions2"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginTop="4dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:background="@drawable/text_view_corners"
        android:gravity="center"
        android:text=" Unit 2"
        android:textAlignment="center"
        android:textSize="14sp"
        android:textStyle="bold"
        android:textColor="@color/white"
        android:paddingStart="8dp"
        android:paddingLeft="8dp"
        app:layout_constraintBottom_toTopOf="@id/divider1"
        app:layout_constraintEnd_toEndOf="@+id/activity_main_include"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintStart_toStartOf="@+id/activity_main_include"
        app:layout_constraintTop_toBottomOf="@+id/instructions"
        app:layout_constraintHorizontal_bias=".5"
        app:layout_constraintWidth_percent=".73"
        app:layout_constraintHeight_percent=".06"
        app:layout_constraintVertical_bias="0.0"/>

    <View
        android:id="@+id/divider1"
        style="@style/Divider"
        android:layout_marginTop="8dp"
        android:layout_marginLeft="4dp"
        android:layout_marginStart="4dp"
        android:layout_marginRight="4dp"
        android:layout_marginEnd="4dp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/instructions2"
        app:layout_constraintBottom_toTopOf="@id/unit1RaceFilter"/>

    <TextView
        android:id="@+id/unit1RaceFilter"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginTop="8dp"
        android:text="------  Unit 1 Settings  ------"
        android:textAlignment="center"
        android:textColor="@color/grayGreen"
        android:textSize="16sp"
        android:textStyle="bold|italic"
        app:layout_constraintHeight_percent=".03"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/divider1"
        app:layout_constraintBottom_toTopOf="@id/unit1Group"
        app:layout_constraintVertical_chainStyle="packed"
        app:layout_constraintWidth_max="240dp"
        app:layout_constraintWidth_percent=".5" />

    <Spinner
        android:id="@+id/unit1SpecialMod"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:background="@drawable/gradient_spinner"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHeight_percent=".055"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/divider1"
        app:layout_constraintWidth_percent=".35"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintWidth_max="240dp"
        app:layout_constraintHeight_max="40dp"/>

    <RadioGroup
        android:id="@+id/unit1Group"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginStart="4dp"
        android:layout_marginLeft="4dp"
        android:layout_marginEnd="2dp"
        android:layout_marginRight="8dp"
        android:layout_marginTop="8dp"
        android:orientation="horizontal"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/unit1RaceFilter"
        app:layout_constraintWidth_percent=".62"
        app:layout_constraintHeight_percent=".055"
        app:layout_constraintHeight_max="40dp">


        <RadioButton
            android:id="@+id/Protoss"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_marginStart="2dp"
            android:layout_marginLeft="2dp"
            android:layout_marginTop="2dp"
            android:textSize="14sp"
            android:buttonTint="@color/deepPurple"
            android:gravity="center_vertical"
            android:text="Protoss" />

        <RadioButton
            android:id="@+id/Terran"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_marginStart="2dp"
            android:layout_marginLeft="2dp"
            android:layout_marginTop="2dp"
            android:layout_marginEnd="0dp"
            android:layout_marginRight="0dp"
            android:textSize="14sp"
            android:gravity="center_vertical"
            android:buttonTint="@color/deepPurple"
            android:text="Terran" />

        <RadioButton
            android:id="@+id/Zerg"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_marginStart="2dp"
            android:layout_marginLeft="2dp"
            android:layout_marginTop="2dp"
            android:layout_marginEnd="2dp"
            android:layout_marginRight="2dp"
            android:textSize="14sp"
            android:gravity="center_vertical"
            android:buttonTint="@color/deepPurple"
            android:text="Zerg" />

    </RadioGroup>

    <Spinner
        android:id="@+id/unit1ShieldsUps"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginTop="4dp"
        android:background="@drawable/gradient_spinner"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHeight_percent="0.055"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/unit1SpecialMod"
        app:layout_constraintWidth_max="240dp"
        app:layout_constraintHeight_max="40dp"
        app:layout_constraintWidth_percent=".35" />

    <Spinner
        android:id="@+id/unit1Name"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginTop="4dp"
        android:background="@drawable/gradient_spinner"
        app:layout_constraintEnd_toStartOf="@+id/unit1AttackUps"
        app:layout_constraintHeight_max="40dp"
        app:layout_constraintHeight_percent=".055"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/unit1ShieldsUps"
        app:layout_constraintWidth_max="350dp"
        app:layout_constraintWidth_percent=".5" />

    <Spinner
        android:id="@+id/unit1AttackUps"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginTop="4dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:background="@drawable/gradient_spinner"
        app:layout_constraintWidth_max="120dp"
        app:layout_constraintHeight_max="40dp"
        app:layout_constraintBottom_toTopOf="@id/divider2"
        app:layout_constraintEnd_toStartOf="@+id/unit1ArmorUps"
        app:layout_constraintHeight_percent="0.055"
        app:layout_constraintTop_toBottomOf="@+id/unit1ShieldsUps"
        app:layout_constraintVertical_bias="0.0"
        app:layout_constraintWidth_percent=".20" />

    <Spinner
        android:id="@+id/unit1ArmorUps"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginTop="4dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:background="@drawable/gradient_spinner"
        app:layout_constraintBottom_toTopOf="@id/divider2"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHeight_max="40dp"
        app:layout_constraintHeight_percent="0.055"
        app:layout_constraintTop_toBottomOf="@+id/unit1ShieldsUps"
        app:layout_constraintWidth_max="120dp"
        app:layout_constraintVertical_bias="0.0"
        app:layout_constraintWidth_percent=".20" />

    <View
        android:id="@+id/divider2"
        style="@style/Divider"
        android:layout_marginTop="12dp"
        android:layout_marginLeft="4dp"
        android:layout_marginStart="4dp"
        android:layout_marginRight="4dp"
        android:layout_marginEnd="4dp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/unit1Name"
        app:layout_constraintBottom_toTopOf="@id/unit2RaceFilter"/>

    <TextView
        android:id="@+id/unit2RaceFilter"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginTop="8dp"
        android:text="------  Unit 2 Settings  ------"
        android:textAlignment="center"
        android:textColor="@color/grayGreen"
        android:textSize="16sp"
        android:textStyle="bold|italic"
        app:layout_constraintBottom_toTopOf="@id/unit2Name"
        app:layout_constraintHeight_percent=".03"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/divider2"
        app:layout_constraintVertical_bias="0.0"
        app:layout_constraintVertical_chainStyle="packed"
        app:layout_constraintWidth_max="240dp"
        app:layout_constraintWidth_percent=".5" />

    <Spinner
        android:id="@+id/unit2SpecialMod"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:background="@drawable/gradient_spinner"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHeight_percent=".055"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/divider2"
        app:layout_constraintWidth_percent=".35"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintWidth_max="240dp"
        app:layout_constraintHeight_max="40dp"
        />

    <RadioGroup
        android:id="@+id/unit2Group"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginStart="4dp"
        android:layout_marginLeft="4dp"
        android:layout_marginEnd="2dp"
        android:layout_marginRight="8dp"
        android:layout_marginTop="8dp"
        android:orientation="horizontal"
        app:layout_constraintBottom_toTopOf="@+id/unit2Name"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHeight_max="40dp"
        app:layout_constraintHeight_percent=".055"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/unit2RaceFilter"
        app:layout_constraintVertical_chainStyle="packed"
        app:layout_constraintWidth_percent=".62"
        app:layout_constraintVertical_bias="0.0">

        <RadioButton
            android:id="@+id/protoss"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_marginStart="2dp"
            android:layout_marginLeft="2dp"
            android:layout_marginTop="2dp"
            android:buttonTint="@color/deepPurple"
            android:text="Protoss"
            android:textSize="14sp" />

        <RadioButton
            android:id="@+id/terran"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_marginStart="2dp"
            android:layout_marginLeft="2dp"
            android:layout_marginTop="2dp"
            android:buttonTint="@color/deepPurple"
            android:text="Terran"
            android:textSize="14sp" />

        <RadioButton
            android:id="@+id/zerg"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_marginStart="2dp"
            android:layout_marginLeft="2dp"
            android:layout_marginTop="2dp"
            android:layout_marginEnd="2dp"
            android:layout_marginRight="2dp"
            android:buttonTint="@color/deepPurple"
            android:text="Zerg"
            android:textSize="14sp" />

    </RadioGroup>

    <Spinner
        android:id="@+id/unit2ShieldsUps"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginTop="4dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:background="@drawable/gradient_spinner"
        app:layout_constraintWidth_max="240dp"
        app:layout_constraintHeight_max="40dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHeight_percent="0.055"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintTop_toBottomOf="@id/unit2SpecialMod"
        app:layout_constraintWidth_percent=".35" />

    <Spinner
        android:id="@+id/unit2Name"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginTop="4dp"
        android:background="@drawable/gradient_spinner"
        app:layout_constraintEnd_toStartOf="@id/unit2AttackUps"
        app:layout_constraintHeight_max="40dp"
        app:layout_constraintHeight_percent="0.055"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/unit2ShieldsUps"
        app:layout_constraintWidth_max="350dp"
        app:layout_constraintWidth_percent=".5" />


    <Spinner
        android:id="@+id/unit2AttackUps"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginTop="4dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginBottom="8dp"
        android:background="@drawable/gradient_spinner"
        app:layout_constraintBottom_toTopOf="@+id/calculate"
        app:layout_constraintEnd_toStartOf="@+id/unit2ArmorUps"
        app:layout_constraintHeight_max="40dp"
        app:layout_constraintHeight_percent="0.055"
        app:layout_constraintTop_toBottomOf="@+id/unit2ShieldsUps"
        app:layout_constraintWidth_max="120dp"
        app:layout_constraintVertical_bias="0.0"
        app:layout_constraintWidth_percent=".20" />

    <Spinner
        android:id="@+id/unit2ArmorUps"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginTop="4dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginBottom="8dp"
        android:background="@drawable/gradient_spinner"
        app:layout_constraintBottom_toTopOf="@+id/calculate"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHeight_max="40dp"
        app:layout_constraintHeight_percent="0.055"
        app:layout_constraintTop_toBottomOf="@+id/unit2ShieldsUps"
        app:layout_constraintWidth_max="120dp"
        app:layout_constraintVertical_bias="0.0"
        app:layout_constraintWidth_percent=".20" />

    <Button
        android:id="@+id/calculate"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginBottom="8dp"
        android:background="@drawable/button_background"
        android:gravity="center"
        android:text="Collide Units"
        android:textAllCaps="false"
        android:textSize="16sp"
        app:layout_constraintBottom_toBottomOf="@+id/resultsView"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHeight_max="80dp"
        app:layout_constraintHeight_percent="0.055"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/unit2Name"
        app:layout_constraintVertical_bias="0.0"
        app:layout_constraintWidth_max="500dp"
        app:layout_constraintWidth_percent="0.5"
        app:layout_constraintHorizontal_bias="0.0"/>

    <Button
        android:id="@+id/clear"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:background="@drawable/button_background"
        android:gravity="center"
        android:text="Clear"
        android:textAllCaps="false"
        android:textSize="16sp"
        app:layout_constraintEnd_toStartOf="@id/home"
        app:layout_constraintHeight_max="80dp"
        app:layout_constraintHeight_percent="0.055"
        app:layout_constraintTop_toBottomOf="@id/unit2AttackUps"
        app:layout_constraintWidth_max="120dp"
        app:layout_constraintWidth_percent=".20" />


    <Button
        android:id="@+id/home"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:background="@drawable/button_background"
        android:text="Home"
        android:textAllCaps="false"
        android:textSize="16sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHeight_max="80dp"
        app:layout_constraintHeight_percent="0.055"
        app:layout_constraintTop_toBottomOf="@+id/unit2ArmorUps"
        app:layout_constraintWidth_max="120dp"
        app:layout_constraintWidth_percent=".20" />

    <TextView
        android:id="@+id/resultsView"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginStart="2dp"
        android:layout_marginLeft="2dp"
        android:layout_marginTop="4dp"
        android:layout_marginEnd="2dp"
        android:layout_marginRight="2dp"
        android:layout_marginBottom="68dp"
        android:paddingLeft="8dp"
        android:paddingRight="8dp"
        android:paddingTop="8dp"
        android:paddingBottom="4dp"
        android:text="-------------------- R E S U L T S --------------------"
        android:textAlignment="center"
        android:textSize="15sp"
        android:scrollbars="vertical"
        android:scrollbarStyle="outsideInset"
        android:fadeScrollbars="false"
        android:scrollbarSize="6dp"
        android:textColor="@color/deepPurple"
        android:background="@drawable/textview_basic_border"
        app:layout_constraintBottom_toBottomOf="@+id/activity_main_include"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.50"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/calculate"
        app:layout_constraintVertical_bias="0.0"
        app:layout_constraintHeight_max="400dp"
        app:layout_constraintWidth_max="1200dp"
        app:layout_constraintWidth_percent=".96"
        app:layout_constraintHeight_min="60dp"/>

</android.support.constraint.ConstraintLayout>

Answer 1

我刚刚解决了这个问题，答案是....从除法器2中删除“ app：layout_constraintBottom_toTopOf =“ @ id / unit2RaceFilter”，因为unit2RaceFilter已经对除法器2施加了约束。即使无法直接键入，也无法被Android Studio发现。