ConstraintLayout - 水平使用权重1，垂直比例

Question

我正在尝试将2个视图水平链接，因此它们都采用50%屏幕并使其高度与宽度相同，因此它们是方形的。目前我有这个，似乎不起作用：

<?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">

    <View
        android:id="@+id/a"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="#F00"
        app:layout_constraintDimensionRatio="H,1:1"
        app:layout_constraintEnd_toStartOf="@+id/b"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <View
        android:id="@+id/b"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="#0F0"
        app:layout_constraintDimensionRatio="H,1:1"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@id/a"
        app:layout_constraintTop_toTopOf="parent" />


</android.support.constraint.ConstraintLayout>

Answer 1

试试这个......

<?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">


<android.support.constraint.Guideline
    android:id="@+id/guideline1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_alignParentEnd="true"
    android:orientation="vertical"
    app:layout_constraintGuide_percent="0.50" />

<View
    android:id="@+id/view2"
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:layout_marginBottom="8dp"
    android:layout_marginEnd="8dp"
    android:layout_marginStart="8dp"
    android:layout_marginTop="8dp"
    android:background="#F00"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toStartOf="@+id/guideline1"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<View
    android:id="@+id/view1"
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:layout_marginBottom="8dp"
    android:layout_marginEnd="8dp"
    android:layout_marginStart="8dp"
    android:layout_marginTop="8dp"
    android:background="#0F0"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="@+id/guideline1"
    app:layout_constraintTop_toTopOf="parent" />

，结果布局将是......

快乐的编码......

Answer 2

Silambarasan的答案实际上没有做我想做的事，但他对Guideline的使用帮助我提示帮助我得到了正确的答案

<?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">

    <android.support.constraint.Guideline
        android:id="@+id/mid_guide"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_constraintGuide_percent="0.50" />

    <View
        android:id="@+id/a"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="#F00"
        app:layout_constraintDimensionRatio="H,1:1"
        app:layout_constraintEnd_toEndOf="@id/mid_guide"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <View
        android:id="@+id/b"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="#0F0"
        app:layout_constraintDimensionRatio="H,1:1"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="@id/mid_guide"
        app:layout_constraintTop_toTopOf="parent" />


</android.support.constraint.ConstraintLayout>