ConstraintLayout的使用

首先需要引入我们的ConstraintLayout，在build.gradle中加入：

compile ‘com.android.support.constraint:constraint-layout:1.0.2’

常用的属性:

layout_constraintLeft_toLeftOf
layout_constraintLeft_toRightOf
layout_constraintRight_toLeftOf
layout_constraintRight_toRightOf
layout_constraintTop_toTopOf
layout_constraintTop_toBottomOf
layout_constraintBottom_toTopOf
layout_constraintBottom_toBottomOf

• 即文章的baseline对齐

layout_constraintBaseline_toBaselineOf

• 与left,right类似

layout_constraintStart_toEndOf
layout_constraintStart_toStartOf
layout_constraintEnd_toStartOf
layout_constraintEnd_toEndOf

• margin不需要解释

android:layout_marginStart
android:layout_marginEnd
android:layout_marginLeft
android:layout_marginTop
android:layout_marginRight
android:layout_marginBottom

layout_constraintHorizontal_bias
layout_constraintVertical_bias

layout_constraintHorizontal_chainStyle
layout_constraintVertical_chainStyle

layout_constraintVertical_weight

Guideline

这里是代码
<?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"
    android:background="#11ff0000"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/banner"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginLeft="10dp"
        android:layout_marginTop="10dp"
        android:layout_marginRight="10dp"
        android:background="#765"
        android:text="banner"
        app:layout_constraintDimensionRatio="16:6"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/tv1"
        android:layout_width="140dp"
        android:layout_height="120dp"
        android:layout_marginLeft="10dp"
        android:layout_marginTop="10dp"
        android:background="#fd3"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toBottomOf="@id/banner" />

    <TextView
        android:id="@+id/tv2"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dp"
        android:layout_marginRight="10dp"
        android:background="@color/colorPrimary"
        android:text="一入编程深似海,一望无际,一入编程深似海,一入编程深似海,一入编程深似海,一望无际"
        app:layout_constraintLeft_toRightOf="@id/tv1"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="@id/tv1" />

    <TextView
        android:id="@+id/tv3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dp"
        android:text="8分钟前"
        android:textColor="#333"
        android:textSize="12dp"
        app:layout_constraintBottom_toBottomOf="@id/tv1"
        app:layout_constraintLeft_toRightOf="@id/tv1" />

    <TextView
        android:id="@+id/tab1"
        android:layout_width="0dp"
        android:layout_height="30dp"
        android:background="#f67"
        android:gravity="center"
        android:text="Tab1"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toLeftOf="@+id/tab2"/>
    <TextView
        android:id="@+id/tab2"
        android:layout_width="0dp"
        android:layout_height="30dp"
        android:background="#a67"
        android:gravity="center"
        android:text="Tab2"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toRightOf="@id/tab1"
        app:layout_constraintRight_toLeftOf="@+id/tab3"/>
    <TextView
        android:id="@+id/tab3"
        android:layout_width="0dp"
        android:layout_height="30dp"
        android:background="#767"
        android:gravity="center"
        android:text="Tab3"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toRightOf="@id/tab2"
        app:layout_constraintRight_toRightOf="parent"/>


    <TextView
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:background="#612"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_bias="0.9"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.9" />
</android.support.constraint.ConstraintLayout>

参考:

个人认为还是使用手写布局会好些
ConstraintLayout的使用手写布局属性自鸿洋的https://blog.csdn.net/lmj623565791/article/details/78011599
ConstraintLayout的使用拖拽布局属性自郭霖的https://blog.csdn.net/guolin_blog/article/details/53122387
ConstraintLayout （约束布局）属性详情https://blog.csdn.net/u010897392/article/details/62423724