本文介绍了在 ConstraintLayout 中分组视图以将它们视为单个视图的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我需要对 约束布局.我想对这些视图进行分组并继续编辑，而 Android Studio 中的布局设计器将它们视为单个视图.有没有办法在不实际用 ViewGroup (另一种布局)包装视图的情况下做到这一点?如果需要这样的包装器，也许 ConstraintLayout 附带的包装器布局允许对对象进行分组，而无需创建像 RelativeLayout 这样的繁重布局?

I need to apply some constraints to a group of views in ConstraintLayout. I want to group these views and continue editing while the layout designer in Android studio treats them as a single view. Is there a way to do so without actually wrapping the views with a ViewGroup (another layout)? If such a wrapper is necessary, maybe there is a wrapper layout that comes with ConstraintLayout and allows to group objects without creating heavy layouts like RelativeLayout?

ConstraintLayout Chains

Android 开发者最近发布了新版本的 ConstraintLayout(1.0.2 截至今天).此版本包含一个新的主要功能 - Chains，其中允许我们在 ConstraintLayout.

`ConstraintLayout Chains`

Android developers recently released a new version of ConstraintLayout (1.0.2 as of today). This version contains a new major feature - Chains, which allows us to group views in ConstraintLayout.

链在单个轴(水平或垂直)上提供类似群体的行为.

如果一组小部件通过双向连接链接在一起，则将它们视为链

A set of widgets are considered a chain if they a linked together via a bi-directional connection

一旦链被创建，有两种可能:

Once a chain is created, there are two possibilities:

在可用空间中展开元素
链也可以打包"，在这种情况下，元素被组合在一起

目前，您需要使用以下 gradle 依赖项才能使用此功能(因为它是 alpha 版):

Currently, you need to use the following gradle dependency to use this feature (since it is an alpha):

 compile 'com.android.support.constraint:constraint-layout:1.0.0-alpha9'

这里你可以找到最新版本的ConstraintLayout 在您的项目中使用.

Here you may find the newest version of ConstraintLayout to use in your projects.

直到 Android Studio 2.3，Android Studio 用户界面设计师不支持创建链，因为您无法在其中添加双向约束.解决方案是在手动 XML 中创建这些约束，如 TranslucentCloud 所述.从 Android Studio 2.3(目前仅在 Canary 频道上)开始，UI 编辑器也支持链(如 GoRoS 中提到的评论).

Until Android Studio 2.3, Android Studio user interface designer did not support creating chains since you couldn't add bi-directional constraints in it. The solution was to create these constraints in manually XML, as mentioned by TranslucentCloud. From Android Studio 2.3 (currently only on canary channel), chains are supported in a UI editor as well (as GoRoS mentioned in comments).

以下是如何使用ConstraintLayout 和chains 将两个视图一起放置在屏幕中间的示例:

Following is an example of how to position two views together in the middle of a screen using ConstraintLayout and chains:

<?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">


    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="16dp"
        android:layout_marginStart="16dp"
        android:layout_marginTop="16dp"
        android:text="TextView"
        app:layout_constraintBottom_toTopOf="@+id/button"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.5"
        app:layout_constraintVertical_chainPacked="true"/>

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="16dp"
        android:layout_marginEnd="16dp"
        android:layout_marginStart="16dp"
        android:layout_marginTop="8dp"
        android:text="Button"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView"/>
</android.support.constraint.ConstraintLayout>

`更新(2018 年 1 月)由 @Mateus Gondim`

在最近的版本中，您应该使用 app:layout_constraintVertical_chainStyle=packed" 而不是 app:layout_constraintVertical_chainPacked=true"

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