Android 约束布局:ConstraintLayout chain LinearLayout的一些特点

像普通得LinearLayout 可以通过weight 权重得方式来分割大小。

约束布局也可以

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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:context=".MainActivity">

    <TextView
        android:id="@+id/tvA"
        android:layout_width="wrap_content"
        android:layout_height="50dp"
        android:background="@android:color/holo_red_dark"
        android:gravity="center"
        android:minWidth="60dp"
        android:text="A"
        android:textColor="@color/white"
        app:layout_constraintEnd_toStartOf="@id/tvB"
        app:layout_constraintHorizontal_chainStyle="spread"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/tvB"
        android:layout_width="wrap_content"
        android:layout_height="50dp"
        android:background="@android:color/holo_red_dark"
        android:gravity="center"
        android:minWidth="80dp"
        android:text="B"
        android:textColor="@color/white"
        app:layout_constraintEnd_toStartOf="@id/tvC"
      
        app:layout_constraintStart_toEndOf="@id/tvA"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/tvC"
        android:layout_width="wrap_content"
        android:layout_height="50dp"
        android:background="@android:color/holo_red_dark"
        android:gravity="center"
        android:minWidth="100dp"
        android:text="C"
        android:textColor="@color/white"
        app:layout_constraintEnd_toEndOf="parent"
       
        app:layout_constraintStart_toEndOf="@id/tvB"
        app:layout_constraintTop_toTopOf="parent" />


</androidx.constraintlayout.widget.ConstraintLayout>

但是这里需要注意得是左右约束必须写完整 然后使用

app:layout_constraintHorizontal_chainStyle="spread"

就可以十七分为三等分并间隔相同距离

还有其他得属性

换成：

app:layout_constraintHorizontal_chainStyle="spread_inside"

app:layout_constraintHorizontal_chainStyle="packed"

 非常的时尚。

 我们还可以不用chain 使用权重 width =0 and weight=1这样

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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:context=".MainActivity">

    <TextView
        android:id="@+id/tvA"
        android:layout_width="0dp"
        android:layout_height="50dp"
        android:background="@android:color/holo_red_dark"
        android:gravity="center"
        android:text="A"
        app:layout_constraintHorizontal_weight="1"
        android:textColor="@color/white"
        app:layout_constraintEnd_toStartOf="@id/tvB"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/tvB"
        android:layout_width="0dp"
        android:layout_height="50dp"
        app:layout_constraintHorizontal_weight="2"
        android:background="@android:color/holo_red_dark"
        android:gravity="center"
        android:text="B"
        android:textColor="@color/white"
        app:layout_constraintEnd_toStartOf="@id/tvC"
        app:layout_constraintStart_toEndOf="@id/tvA"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        app:layout_constraintHorizontal_weight="3"
        android:id="@+id/tvC"
        android:layout_width="0dp"
        android:layout_height="50dp"
        android:background="@android:color/holo_red_dark"
        android:gravity="center"
        android:text="C"
        android:textColor="@color/white"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@id/tvB"
        app:layout_constraintTop_toTopOf="parent" />


</androidx.constraintlayout.widget.ConstraintLayout>

将布局1：2：3分割