我在布局文件中有ConstraintLayout，当我将height的{{1}}设置为 0dp 并设置其他约束时，我可以看到布局大小与我想要的大小相同（here），但是，当我在布局中放置另一个ConstraintLayout时（在本例中为View），它不会调整大小它的MapView 高度（here）！这是我的整个XML文件：
parent任何人都可以向我解释这种行为并帮助我获得<?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"
xmlns:mapbox="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/dialogContainer"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageButton
android:id="@+id/closeDialogButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="16dp"
android:layout_marginTop="8dp"
android:background="@drawable/ic_close_workorder"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/dialogInfo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="24dp"
android:layout_marginStart="24dp"
android:layout_marginTop="8dp"
android:fontFamily="@font/open_sans_semibold"
android:text="TextView"
android:textColor="@color/textTint"
android:textSize="15sp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/dialogTitle"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginEnd="16dp"
android:layout_marginStart="24dp"
android:layout_marginTop="8dp"
android:fontFamily="@font/gotham_medium"
android:text="TextView"
android:textColor="@color/primaryDark"
android:textSize="20sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toBottomOf="@+id/dialogInfo" />
<android.support.constraint.ConstraintLayout
android:id="@+id/constraintLayout6"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="@+id/dialogTitle">
<ImageView
android:id="@+id/imageView6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="24dp"
android:layout_marginLeft="16dp"
android:layout_marginStart="16dp"
android:layout_marginTop="24dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="@drawable/ic_description" />
<TextView
android:id="@+id/descriptionText"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="16dp"
android:layout_marginStart="16dp"
android:layout_marginTop="8dp"
android:fontFamily="@font/open_sans_light"
android:text="TextView"
android:textColor="@color/primaryDark"
android:textSize="14dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintLeft_toRightOf="@+id/imageView6"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
<android.support.constraint.ConstraintLayout
android:id="@+id/divider1"
android:layout_width="0dp"
android:layout_height="1dp"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:layout_marginTop="4dp"
android:background="@color/dividerColor"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="@+id/constraintLayout6">
</android.support.constraint.ConstraintLayout>
<android.support.constraint.ConstraintLayout
android:id="@+id/constraintLayout7"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="4dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="@+id/divider1">
<ImageView
android:id="@+id/imageView7"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="24dp"
android:layout_marginLeft="16dp"
android:layout_marginStart="16dp"
android:layout_marginTop="24dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="@drawable/ic_materials" />
<TextView
android:id="@+id/materialsText"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="16dp"
android:layout_marginStart="16dp"
android:layout_marginTop="8dp"
android:fontFamily="@font/open_sans_light"
android:text="TextView"
android:textColor="@color/primaryDark"
android:textSize="14dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintLeft_toRightOf="@+id/imageView7"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
<android.support.constraint.ConstraintLayout
android:id="@+id/divider2"
android:layout_width="0dp"
android:layout_height="1dp"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:layout_marginTop="4dp"
android:background="@color/dividerColor"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="@+id/constraintLayout7">
</android.support.constraint.ConstraintLayout>
<android.support.constraint.ConstraintLayout
android:id="@+id/constraintLayout9"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="4dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="@+id/divider2">
<ImageView
android:id="@+id/imageView8"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="24dp"
android:layout_marginLeft="16dp"
android:layout_marginStart="16dp"
android:layout_marginTop="24dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="@drawable/ic_contact" />
<TextView
android:id="@+id/contactText"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="16dp"
android:layout_marginStart="16dp"
android:layout_marginTop="8dp"
android:fontFamily="@font/open_sans_light"
android:text="TextView"
android:textColor="@color/primaryDark"
android:textSize="14dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintLeft_toRightOf="@+id/imageView8"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
<TextView
android:id="@+id/noMapInstruction"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Geen kaart beschikbaar"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="@+id/constraintLayout9" />
<android.support.constraint.ConstraintLayout
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="@+id/constraintLayout9">
<com.mapbox.mapboxsdk.maps.MapView
android:id="@+id/locationMap"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
mapbox:mapbox_cameraZoom="11"
mapbox:mapbox_renderTextureMode="true"
mapbox:mapbox_styleUrl="mapbox://styles/mapbox/streets-v10" />
</android.support.constraint.ConstraintLayout>
<android.support.constraint.ConstraintLayout
android:id="@+id/constraintLayout10"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:background="@color/fadedWhite"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="@+id/constraintLayout9">
<TextView
android:id="@+id/locationText"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginBottom="24dp"
android:layout_marginEnd="16dp"
android:layout_marginStart="16dp"
android:layout_marginTop="24dp"
android:fontFamily="@font/open_sans_light"
android:text="TextView"
android:textColor="@color/primaryDark"
android:textSize="14dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintLeft_toRightOf="@+id/imageView10"
app:layout_constraintTop_toTopOf="parent" />
<ImageView
android:id="@+id/imageView10"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="24dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="24dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="@drawable/ic_location" />
</android.support.constraint.ConstraintLayout>
<ImageView
android:id="@+id/openWorkOrder"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
android:cropToPadding="false"
android:src="@drawable/button_open_workorder"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent" />
</android.support.constraint.ConstraintLayout>
的全高吗？ This是我尝试实现的目标，但没有中间视图（联系人图标）的信息。基本上，ConstraintLayout应在后面显示位置文字。
答案 0 :(得分：0)
为0dp及其容器更改wrap_content MapView。也可能用于其他布局。
另外，我发现你使用了很多ConstraintLayout s。例如，分隔符（divider1和divider2）是ConstraintLayout，但可能只是View s，这会提高性能。
答案 1 :(得分：0)
这些限制：
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
忽略layout_width中设置的宽度，并将此视图的左侧连接到父级的左侧，右侧的右侧，结果将是match_parent的宽度。
类似地，你可以做Top_topTopOf =“parent”和Bottom_toBottomOf =“parent”但是因为如果你想要线性放置你在屏幕上有更多的视图你可以使用Top_toBottomOf =“@ id / other”