ConstraintLayout 中的 CardView 不包含高度

Question

ConstraintLayout 中的 CardView 没有环绕高度。

用稳定的 CL 库面对similar issue：

compile 'com.android.support.constraint:constraint-layout:1.0.2'

Android Studio：2.3.2

观察：

1. 设置硬编码 cardview-height 可解决此问题。
2. 使用 RelativeLayout 修复更改 CardView。

Cardview 中是否还有 issue 难以应对 ConstraintLayout。

XML：

<?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:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:layout_editor_absoluteX="0dp"
    tools:layout_editor_absoluteY="25dp">


    <android.support.v7.widget.CardView
        android:id="@+id/cardView"
        android:layout_width="0dp"
        android:layout_height="122dp"
        android:layout_marginBottom="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginStart="8dp"
        app:cardBackgroundColor="@color/io15_blue_grey_100"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHeight_default="wrap"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintWidth_default="spread">

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

            <ImageView
                android:id="@+id/mobLeftIcon"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginBottom="8dp"
                android:layout_marginLeft="16dp"
                android:layout_marginRight="16dp"
                android:layout_marginTop="8dp"
                app:layout_constraintBottom_toBottomOf="@+id/mobInputLayout"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintRight_toLeftOf="@+id/mobInputLayout"
                app:layout_constraintTop_toTopOf="@+id/mobInputLayout"
                app:srcCompat="@drawable/ic_up" />

            <android.support.design.widget.TextInputLayout
                android:id="@+id/mobInputLayout"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginTop="8dp"
                app:layout_constraintLeft_toRightOf="@+id/mobLeftIcon"
                app:layout_constraintRight_toRightOf="parent"
                app:layout_constraintTop_toTopOf="parent">

                <EditText
                    android:id="@+id/editText4"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:hint="Mobile Number"
                    android:text="123123123" />
            </android.support.design.widget.TextInputLayout>

            <ImageView
                android:id="@+id/phoneLeftIcon"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginBottom="8dp"
                android:layout_marginLeft="16dp"
                android:layout_marginRight="16dp"
                android:layout_marginTop="8dp"
                app:layout_constraintBottom_toBottomOf="@+id/phoneInputLayout"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintRight_toLeftOf="@+id/phoneInputLayout"
                app:layout_constraintTop_toTopOf="@+id/phoneInputLayout"
                app:srcCompat="@drawable/ic_up" />

            <android.support.design.widget.TextInputLayout
                android:id="@+id/phoneInputLayout"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginTop="8dp"
                app:layout_constraintLeft_toRightOf="@+id/phoneLeftIcon"
                app:layout_constraintRight_toRightOf="parent"
                app:layout_constraintTop_toBottomOf="@id/mobInputLayout">

                <EditText
                    android:id="@+id/editText5"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:hint="Telphone Number"
                    android:text="123123123" />
            </android.support.design.widget.TextInputLayout>

        </android.support.constraint.ConstraintLayout>

    </android.support.v7.widget.CardView>

</android.support.constraint.ConstraintLayout>

截图：

Answer 1

要让 CardView 包装 ConstraintLayout 所代表的内容，你必须在 ConstraintLayout 内部的视图中添加 3 个链：

1. mobLeftIcon 和 mobInputLayout 之间的水平扩展链
2. phoneLeftIcon 和 phoneInputLayout 之间的水平扩展链
3. mobInputLayout 和 phoneInputLayout 之间的垂直传播链

查看布局编辑器的截图：

---

这是您的布局的最终源代码：

<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">

    <android.support.v7.widget.CardView
        android:id="@+id/cardView"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginBottom="8dp"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintBottom_toBottomOf="parent">

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

            <ImageView
                android:id="@+id/mobLeftIcon"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="8dp"
                android:layout_marginStart="16dp"
                android:layout_marginBottom="8dp"
                app:srcCompat="@drawable/ic_up"
                app:layout_constraintTop_toTopOf="@+id/mobInputLayout"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintBottom_toBottomOf="@+id/mobInputLayout"
                app:layout_constraintEnd_toStartOf="@+id/mobInputLayout"
                app:layout_constraintHorizontal_chainStyle="spread" />

            <android.support.design.widget.TextInputLayout
                android:id="@+id/mobInputLayout"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginTop="8dp"
                android:layout_marginStart="16dp"
                android:layout_marginEnd="8dp"
                app:layout_constraintTop_toTopOf="parent"
                app:layout_constraintStart_toEndOf="@+id/mobLeftIcon"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintBottom_toTopOf="@+id/phoneInputLayout"
                app:layout_constraintVertical_chainStyle="spread">

                <EditText
                    android:id="@+id/editText4"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:hint="Mobile Number"
                    android:text="123123123" />
            </android.support.design.widget.TextInputLayout>

            <ImageView
                android:id="@+id/phoneLeftIcon"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="8dp"
                android:layout_marginStart="16dp"
                android:layout_marginBottom="8dp"
                app:srcCompat="@drawable/ic_up"
                app:layout_constraintTop_toTopOf="@+id/phoneInputLayout"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintBottom_toBottomOf="@+id/phoneInputLayout"
                app:layout_constraintEnd_toStartOf="@+id/phoneInputLayout"
                app:layout_constraintHorizontal_chainStyle="spread" />

            <android.support.design.widget.TextInputLayout
                android:id="@+id/phoneInputLayout"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginTop="8dp"
                android:layout_marginStart="16dp"
                android:layout_marginEnd="8dp"
                app:layout_constraintTop_toBottomOf="@+id/mobInputLayout"
                app:layout_constraintStart_toEndOf="@+id/phoneLeftIcon"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintBottom_toBottomOf="parent">

                <EditText
                    android:id="@+id/editText5"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:hint="Telphone Number"
                    android:text="123123123" />

            </android.support.design.widget.TextInputLayout>

        </android.support.constraint.ConstraintLayout>

    </android.support.v7.widget.CardView>

</android.support.constraint.ConstraintLayout>

作为结果，您会得到如下结果：

Answer 2

 <android.support.v7.widget.CardView
        android:id="@+id/cardView"
        android:layout_width="0dp"
        android:layout_height="122dp"

可以使用高度为0dp，使用直线

        app:layout_constraintHeight_default="wrap"