这个是内容呢显示相对

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/cons">
    <TextView
        android:id="@+id/txt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="我是小牧"
        android:layout_marginTop="200dp"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toLeftOf="@+id/txt1"/>
    <TextView
        android:id="@+id/txt1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="我是小牧"
        android:layout_marginTop="200dp"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintLeft_toRightOf="@+id/txt"/>
</android.support.constraint.ConstraintLayout>

权重显示如下

把2者的宽度设置为0dp 然后添加widght

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/cons">
    <TextView
        android:id="@+id/txt"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="我是小牧"
        android:layout_marginTop="200dp"
        android:gravity="center"
        app:layout_constraintHorizontal_weight="1"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toLeftOf="@+id/txt1"/>
    <TextView
        android:id="@+id/txt1"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="我是小牧"
        android:layout_marginTop="200dp"
        android:gravity="center"
        app:layout_constraintHorizontal_weight="1"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintLeft_toRightOf="@+id/txt"/>
</android.support.constraint.ConstraintLayout>