Android ConstraintLayout app:layout_constraintHorizontal_weight

<?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"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/tv1"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:background="@android:color/holo_red_light"
        android:gravity="center"
        android:text="1"
        android:textSize="100dp"
        app:layout_constraintHorizontal_weight="1"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toLeftOf="@id/tv2"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/tv2"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:background="@android:color/holo_green_light"
        android:gravity="center"
        android:text="2"
        android:textSize="100dp"
        app:layout_constraintHorizontal_weight="1"
        app:layout_constraintLeft_toRightOf="@id/tv1"
        app:layout_constraintRight_toLeftOf="@id/tv3"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/tv3"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:background="@android:color/holo_blue_light"
        android:gravity="center"
        android:text="3"
        android:textSize="100dp"
        app:layout_constraintHorizontal_weight="1"
        app:layout_constraintLeft_toRightOf="@id/tv2"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

Android ConstraintLayout约束布局的居中_android constraintlayout 两个图片并排水平居中-CSDN博客Android ConstraintLayout约束布局的居中xml代码：https://blog.csdn.net/zhangphil/article/details/79927845

Android约束布局ConstraintLayout-CSDN博客https://blog.csdn.net/zhangphil/article/details/78217322

Android ConstraintLayout按比例缩放View_constraintlayout 比例-CSDN博客Android ConstraintLayout按比例缩放View关键点有两个，第一，使用Android ConstraintLayout的layout_constraintDimensionRatio属性，设置宽高比缩放比例，宽:高。第二，恒定宽和高，另外一个方向就会按照比例缩放。https://blog.csdn.net/zhangphil/article/details/79937497