Android Studio 3.0的布局编辑器工具栏和上下文菜单中缺少添加（垂直/水平）障碍

Question

I was referring a guide on using Constraint layout at https://developer.android.com/training/constraint-layout/index.html#constrain-to-a-barrier to get hands on with Barriers.

The step says,

To create a barrier, follow these steps:

Click Guidelines in the toolbar, and then click Add Vertical Barrier or Add >Horizontal Barrier.

Whereas when I clicked on Guidelines icon, it displayed only two options ie,

1. Add Vertical Guideline
2. Add Horizontal Guideline

Even the context menu does not display option to add Barrier.

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Already there is a question with same context Add Constratint Layout Barriers Missing In Context Menu of Android Android Studio but for Android Studio 2.3.3 which is answered by CommonsWare.

Had a discussion with CommonsWare through comments where he suggested to use beta of ConstraintLayout 1.1 .

But as per the training guide for using ConstraintLayout the constraintLayout version is 1.0.2

dependencies { compile 'com.android.support.constraint:constraint-layout:1.0.2' }

Even Android Studio 3.0 release notes says create barriers option is now supported (with an exception for Add Group, which requires ConstraintLayout 1.1.0 beta 2 or higher).

Environment details :

Android Studio 3.0.1
Build #AI-171.4443003, built on November 9, 2017
JRE: 1.8.0_152-release-915-b01 amd64
JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
Windows 8.1 6.3

Constraint Layout :1.0.2
Graddle wrapper : gradle-4.1
buildToolsVersion : 26.0.2

Answer 1

Per this documentation barriers were introduced in version 1.1.0-beta1 of ConstraintLayout . (Emphasis is mine)

Bugfixes related to wrap_content

New features: barriers , placeholder, percent dimensions

Since barriers were introduced in 1.1.0-beta1, you will not see them in any earlier releases.

I am currently running Android Studio 3.0.1 with ConstraintLayout 1.1.0-beta3 and this is what I see when I press the guidelines button in the designer:

The context menu also shows barriers as an option.

So, in short, you need Android Studio 3.0+ and ConstraintLayout version 1.1.0-beta1 or later to see these options.