blocks|key|313394|text|无法安装/更新ConstraintLayout的支持库。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|313395|只需打开Preferences+>+Appearance+&+Behavior+>+System+Settings+>+Android并移动到SDK+Tools选项卡即可。检查以下字段并安装。|313396|​|313397|📷|atomic|313398|313399|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/68db522725501df9e1adbf8b8f6eda2b.png|imageAlt^0|7|G|0|4|B|I|L|16|F|1O|7|1Z|9|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Z|8|@$9|10|A|11|B|C]|$9|12|A|13|B|C]|$9|14|A|15|B|C]|$9|16|A|17|B|C]|$9|18|A|19|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|1A|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|1B|8|@]|D|@$9|1C|A|1D|1|1E]]|E|$]]|$1|M|3|I|5|6|7|1F|8|@]|D|@]|E|$]]|$1|N|3|-4|5|6|7|1G|8|@]|D|@]|E|$]]]|O|$P|$5|Q|R|S|E|$T|U|V|-4]]]]

Support libraries for <code>ConstraintLayout</code> could not be installed/updated. 

Just open <code>Preferences</code> > <code>Appearance &amp; Behavior</code> > <code>System Settings</code> > <code>Android</code> and move to <code>SDK Tools</code> tab. Check the following fields and install.

<a href="https://i.stack.imgur.com/xD8tl.png" rel="noreferrer"><img src="https://i.stack.imgur.com/xD8tl.png" alt="Preferences"></a>

blocks|key|3653000|text|在我的例子中，安装了对ConstraintLayout的支持库，但我在ConstraintLayout文件中添加了不正确的ConstraintLayout库版本。为了查看您安装了哪个版本，请转到Preferences+>+Appearance+&+Behavior+>+System+Settings+>+Android+SDK。现在，单击右侧窗格中的SDK+Tools选项卡。检查显示包的详细信息，并注意版本。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3653001|​|3653002|📷|atomic|3653003|3653004|最后，您可以在build.gradle文件中添加正确的版本。|3653005|dependencies+{
++++compile+fileTree(dir:+'libs',+include:+['*.jar'])
++++compile+'com.android.support.constraint:constraint-layout:1.0.0-alpha9'
++++testCompile+'junit:junit:4.12'
}|code-block|syntax|javascript|3653006|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/0f37c97b0ba74c5fdfb64c302b3958e9.png|imageAlt^0|2P|B|33|L|3R|F|49|B|4W|9|0|0|0|1|0|0|0|7|C|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@$9|12|A|13|B|C]|$9|14|A|15|B|C]|$9|16|A|17|B|C]|$9|18|A|19|B|C]|$9|1A|A|1B|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1C|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|1D|8|@]|D|@$9|1E|A|1F|1|1G]]|E|$]]|$1|K|3|G|5|6|7|1H|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|1I|8|@$9|1J|A|1K|B|C]]|D|@]|E|$]]|$1|N|3|O|5|P|7|1L|8|@]|D|@]|E|$Q|R]]|$1|S|3|-4|5|6|7|1M|8|@]|D|@]|E|$]]]|T|$U|$5|V|W|X|E|$Y|Z|10|-4]]]]

In my case, that support libraries for ConstraintLayout were installed, but I was adding the incorrect version of ConstraintLayout Library in my build.gradle file. In order to see what version have you installed, go to <code>Preferences</code> > <code>Appearance &amp; Behavior</code> > <code>System Settings</code> > <code>Android SDK</code>. Now, click on <code>SDK Tools</code> tab in right pane. Check Show Package Details and take note of the version.

<a href="https://i.stack.imgur.com/sksVj.png" rel="noreferrer"><img src="https://i.stack.imgur.com/sksVj.png" alt="enter image description here"></a>

Finally you can add the correct version in the <code>build.gradle</code> file

<pre><code>dependencies {
 compile fileTree(dir: 'libs', include: ['*.jar'])
 compile 'com.android.support.constraint:constraint-layout:1.0.0-alpha9'
 testCompile 'junit:junit:4.12'
}
</code></pre>

blocks|key|313306|text|修复方法是更新build.gradle中的android插件。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|313307|这应该是可行的:+classpath+'com.android.tools.build:gradle:2.2.0-alpha2‘2’|313308|或者您也可以使用最新的:+classpath+'com.android.tools.build:gradle:2.2.0-alpha3‘3’|313309|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

The fix is to update the android gradle plugin in your build.gradle.

This should work:
classpath 'com.android.tools.build:gradle:2.2.0-alpha2'

Or you can use the latest:
classpath 'com.android.tools.build:gradle:2.2.0-alpha3'

blocks|key|3653084|text|我的问题是，SDK工具将其更新为最新版本，在我的示例中是1.0.0-alpha9+9，但在我的gradle依赖项中设置为|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3653085|编译'com.android.support.constraint:constraint-layout:1.0.0-alpha8‘以便您可以将gradle构建文件更改为|3653086|编译'com.android.support.constraint:constraint-layout:1.0.0-alpha9‘或检查中的“显示包详细信息”，然后安装所需的版本。请看下面的剧本。SDK工具图像|3653087|​|3653088|📷|atomic|offset|length|3653089|3653090|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/667d2b69da1f4c04874522b881565d63.png|imageAlt^0|0|0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Y|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|Z|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|10|8|@]|9|@$K|11|L|12|1|13]]|A|$]]|$1|M|3|G|5|6|7|14|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|O|$P|$5|Q|R|S|A|$T|U|V|-4]]]]

My problem was, that the SDK Tools updated it to the latest version, in my case it was 1.0.0-alpha9, but in my gradle dependency was set to

compile 'com.android.support.constraint:constraint-layout:1.0.0-alpha8'
So, you can change your gradle build file to

compile 'com.android.support.constraint:constraint-layout:1.0.0-alpha9'
Or you check "Show package details" in the SDK Tools Editor and install your needed version. See screenshow below. Image of SDK Tools

<a href="https://i.stack.imgur.com/dZ96H.png" rel="noreferrer"><img src="https://i.stack.imgur.com/dZ96H.png" alt="enter image description here"></a>

blocks|key|3653214|text|确保在模块级的maven.google.com文件中声明了build.gradle存储库。
repositories+{+++++++++++maven+{+++++++++++++++++url+'https://maven.google.com'+++++++++++}+++++}|type|ordered-list-item|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3653215|2.将库作为依赖项添加到同一个build.gradle文件中：|unstyled|3653216|dependencies+{
++++++compile+'com.android.support.constraint:constraint-layout:1.0.2'
}|code-block|syntax|javascript|3653217|entityMap^0|1A|2P|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|S|8|@]|D|@]|E|$]]|$1|I|3|J|5|K|7|T|8|@]|D|@]|E|$L|M]]|$1|N|3|-4|5|H|7|U|8|@]|D|@]|E|$]]]|O|$]]

<ol>
<li>Ensure you have the maven.google.com repository declared in your module-level build.gradle file

<code>repositories {
 maven {
 url 'https://maven.google.com'
 }
 }</code></li>
</ol>

2.Add the library as a dependency in the same build.gradle file:

<pre><code>dependencies {
 compile 'com.android.support.constraint:constraint-layout:1.0.2'
}
</code></pre>

blocks|key|3652783|text|我将我的android插件更新为2.2.0-alpha4，并将约束布局依赖于1.0.0-alpha3，它现在似乎正在工作。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3652784|entityMap^0|G|C|12|C|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

I updated my android gradle plugin to <code>2.2.0-alpha4</code> and constraint layout dependency to <code>1.0.0-alpha3</code> and it seems to be working now

blocks|key|217871|text|首先，我尝试了我在stackoverflow...from上读到的所有东西--将gradle升级到XY版本，将ConstraintLayout更新为XY版本……我甚至将我的SDK和Android更新到了最新的version...but上--什么都不起作用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|217872|唯一对我有效的解决方案是从gradle和SDK中删除ConstraintLayout库，然后打开随机xml布局，并在设计视图中的选项板节中搜索如果您已经成功地从项目中删除了库，那么如果您双击ConstraintLayout元素，就可以从那里安装库。|offset|length|style|BOLD|217873|它在我的应用程序build.gradle中创建了下一行：|217874|'com.android.support.constraint:constraint-layout:1.0.0-beta1'|code-block|syntax|javascript|217875|在我的项目build.gradle中，我有以下内容：|217876|classpath+'com.android.tools.build:gradle:2.2.2'|217877|Android版本2.2.2|217878|entityMap^0|0|1M|D|2N|G|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@$D|Y|E|Z|F|G]|$D|10|E|11|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|12|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|13|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|14|8|@]|9|@]|A|$]]|$1|Q|3|R|5|L|7|15|8|@]|9|@]|A|$M|N]]|$1|S|3|T|5|6|7|16|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|V|$]]

First I tried everything that I have read on stackoverflow...from updating gradle to XY version, to updating ConstraintLayout to XY version...I even update my SDK tools and Android Studio to the latest version...but nothing was working.

The only solution that worked for me was that I delete ConstraintLayout library from gradle and SDK, then I opened random xml layout and in Design view under Palette section search for ConstraintLayout. If you have successfully deleted library from your project then you will be able to install the library from there if you double clicked on ConstraintLayout element.

That has create next line in my app build.gradle:

<pre><code>'com.android.support.constraint:constraint-layout:1.0.0-beta1'
</code></pre>

In my project build.gradle I have this:

<pre><code>classpath 'com.android.tools.build:gradle:2.2.2'
</code></pre>

Android studio version 2.2.2

blocks|key|313851|text|阿尔法版本不再可用！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|313852|implementation+'com.android.support.constraint:constraint-layout:1.1.3'|code-block|syntax|javascript|313853|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Alpha version is no longer available ! 

<pre class="lang-java prettyprint-override"><code>implementation 'com.android.support.constraint:constraint-layout:1.1.3'
</code></pre>

blocks|key|3653188|text|为了确保在studio版本2.3中，您不会看到sdk工具中的下拉列表接近约束布局，它将默认安装最新版本。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3653189|要获得所需的版本，请选中“显示软件包详细信息和繁荣”框，现在您可以选择要安装的所需版本。|3653190|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Just to make sure that in studio version 2.3 you won't see a dropdown near constraint-layout in sdk tools, it will by default install the latest version

To get the desired version check the box saying show package details and boom you can now choose the desired version you want to install

blocks|key|215882|text|分级com.android.tools.build:gradle:2.2.0-alpha6|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|215883|约束布局依赖com.android.support.constraint:constraint-layout:1.0.0-alpha4|215884|为我工作|215885|entityMap^0|2|17|0|6|1P|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|R|8|@]|D|@]|E|$]]|$1|J|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|K|$]]

gradle <code>com.android.tools.build:gradle:2.2.0-alpha6</code> 

constraint layout dependency <code>com.android.support.constraint:constraint-layout:1.0.0-alpha4</code> 

works for me

blocks|key|313429|text|对我来说，这是一个完全不同的问题。当我在SDK工具中安装约束依赖时，这些工具不知怎么地将它们写入错误的目录。那是|type|unstyled|depth|inlineStyleRanges|entityRanges|data|313430|/home/${USER}/Android/Sdk/extras/%2Bm2repository%2B/com/.../constraint|offset|length|style|CODE|313431|而不是|BOLD|313432|/home/${USER}/Android/Sdk/extras/%2Bandroid%2B/%2Bm2repository%2B/com/.../constraint|313433|​|313434|补救措施：|313435|只需将1.0.0-alpha*目录复制到后一条路径即可|313436|entityMap^0|0|0|1U|0|0|3|0|0|24|0|0|0|5|0|3|C|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@$D|W|E|X|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|Y|8|@$D|Z|E|10|F|J]]|9|@]|A|$]]|$1|K|3|L|5|6|7|11|8|@$D|12|E|13|F|G]]|9|@]|A|$]]|$1|M|3|N|5|6|7|14|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|15|8|@$D|16|E|17|F|J]]|9|@]|A|$]]|$1|Q|3|R|5|6|7|18|8|@$D|19|E|1A|F|G]]|9|@]|A|$]]|$1|S|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|T|$]]

For me it was a completely different issue. When I installed constraint dependancy in SDK tools, the tools somehow wrote them into the wrong directory. That is
<code>/home/${USER}/Android/Sdk/extras/+m2repository+/com/.../constraint</code>
instead of
<code>/home/${USER}/Android/Sdk/extras/+android+/+m2repository+/com/.../constraint</code>
<h3></h3>
Remedy:
Just copy the <code>1.0.0-alpha*</code> directories into the latter path

blocks|key|313694|text|在我的例子中，我必须先删除以前的版本，然后下载最新的版本。v1.0稳定版于2月23日发布。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|313695|📷|atomic|offset|length|313696|​|313697|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/b0e8354588b639edcf6b14807dd52e0e.png|imageAlt^0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|S|8|@]|9|@$E|T|F|U|1|V]]|A|$]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|J|$K|$5|L|M|N|A|$O|P|Q|-4]]]]

In my case, I had to remove the previous versions first and download the latest one instead. v1.0 stable was released on Feb 23rd. <a href="https://i.stack.imgur.com/0INcf.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/0INcf.png" alt="enter image description here"></a>

blocks|key|216142|text|在我的例子中，我有一个名为"app“和"sdk”的多模块项目。"sdk“模块是我添加约束布局库的模块。当我试图将"sdk“合并到一个名为"app2”的新的多模块项目时，我遇到了错误。解决方案是确保我将Google添加到"app2“的项目级别的app2文件中。可以通过将"+Google+()“放在allprojects.repositories下的项目级build.gradle文件中添加google：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|216143|allprojects+{
++++repositories+{
++++++++jcenter()
++++++++google()
++++}
}|code-block|syntax|javascript|216144|entityMap^0|44|O|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

In my case, I had a multi-module project called "app" and "sdk". The "sdk" module is the one where I had added the constraint layout library. I got the error when I tried to incorporate "sdk" into a new multi-module project called "app2". The solution was to ensure I had added the Google Maven Repository to the project-level build.gradle file for "app2". The Google Maven Repository can be added by putting "google()" under <code>allprojects.repositories</code> in the project-level build.gradle file:

<pre><code>allprojects {
 repositories {
 jcenter()
 google()
 }
}
</code></pre>

blocks|key|3653277|text|在我的例子中，我使用的是2.3，我想使用当前最新的ConstraintLayout+1.1.3，但是我的首选项>外观&行为>系统设置>安卓中的最新版本是1.0.2。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3653278|为了使用ConstraintLayout+1.1.3，我更新了my从2.3到当前最新的3.2.1，com.android.tools.build:gradle从2.2.2到3.2.1，gradle从3.3到4.6，buildToolsVersion从25.0.0到28.0.3。|3653279|我还将maven+{+url+'https://maven.google.com‘}添加到项目级build.gradle文件中的Maven存储库中，这解决了我的问题。|offset|length|3653280|entityMap|0|LINK|mutability|MUTABLE|url|https://maven.google.com/^0|0|0|G|O|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@$F|S|G|T|1|U]]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

In my case, I was using AS 2.3 and I wanted to use the currently latest ConstraintLayout 1.1.3, but the latest version in my Preferences > Appearance &amp; Behavior > System Settings > Android was 1.0.2.

To use ConstraintLayout 1.1.3, I updated my AS from 2.3 to currently latest 3.2.1, com.android.tools.build:gradle from 2.2.2 to 3.2.1, gradle from 3.3 to 4.6 and buildToolsVersion from 25.0.0 to 28.0.3. 

I also added maven { url '<a href="https://maven.google.com" rel="nofollow noreferrer">https://maven.google.com</a>' } to the Maven repositories in the project-level build.gradle file and that solved my problem.

blocks|key|313859|text|就像那些还在找这个的人一样。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|313860|ConstraintLayout+1.0.1及更低版本已被maven否决。|313861|有关可下载的可用约束布局的列表，请参见下面：|313862|https://maven.google.com/web/index.html?q=Constrain#com.android.support.constraint:constraint-layout|offset|length|313863|目前最简单的解决办法是改变|313864|implementation+'com.android.support.constraint:constraint-layout:1.0.0-beta1'|style|CODE|313865|至|313866|implementation+'com.android.support.constraint:constraint-layout:1.0.2'|313867|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|0|2S|0|0|0|0|25|0|0|0|1Z|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|12|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|13|8|@]|9|@$H|14|I|15|1|16]]|A|$]]|$1|J|3|K|5|6|7|17|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|18|8|@$H|19|I|1A|N|O]]|9|@]|A|$]]|$1|P|3|Q|5|6|7|1B|8|@]|9|@]|A|$]]|$1|R|3|S|5|6|7|1C|8|@$H|1D|I|1E|N|O]]|9|@]|A|$]]|$1|T|3|-4|5|6|7|1F|8|@]|9|@]|A|$]]]|U|$V|$5|W|X|Y|A|$Z|G]]]]

Just as a heads up to those still searching for this.
ConstraintLayout 1.0.1 and lower have been deprecated by maven.
For a list of available constraint layouts that can be downloaded, see below:
<a href="https://maven.google.com/web/index.html?q=Constrain#com.android.support.constraint:constraint-layout" rel="nofollow noreferrer">https://maven.google.com/web/index.html?q=Constrain#com.android.support.constraint:constraint-layout</a>
The easiest solution at the moment, is to change
<code>implementation 'com.android.support.constraint:constraint-layout:1.0.0-beta1'</code>
to
<code>implementation 'com.android.support.constraint:constraint-layout:1.0.2'</code>

blocks|key|3652823|text|我在classpath+'com.android.tools.build:gradle:2.1.0‘中使用了com.android.support.constraint:constraint-layout:1.0.0-alpha2，它运行起来很有魅力。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3652824|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I used com.android.support.constraint:constraint-layout:1.0.0-alpha2 with classpath 'com.android.tools.build:gradle:2.1.0', it worked like charm.

blocks|key|313462|text|不确定是否为时已晚，但如果在更新ConstraintLayout和Solver工具后仍有错误，这个解决方案可能会有所帮助：Error:(30,+13)+Failed+to+resolve:+com.android.support.constraint:constraint-layout:1.0.0-alpha4|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|313463|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/38450414/error30-13-failed-to-resolve-com-android-support-constraintconstraint-layo/39815613#39815613^0|1P|2N|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

Not sure if I'm too late, but in case someone has still the error after an update of ConstraintLayout and Solver over the SDK Tools, maybe this solution could help: <a href="https://stackoverflow.com/questions/38450414/error30-13-failed-to-resolve-com-android-support-constraintconstraint-layo/39815613#39815613">Error:(30, 13) Failed to resolve: com.android.support.constraint:constraint-layout:1.0.0-alpha4</a>

blocks|key|218042|text|它可以在雄激素中使用，如下所示|type|unstyled|depth|inlineStyleRanges|entityRanges|data|218043|implementation+"androidx.constraintlayout:constraintlayout:2.0.0-alpha1"|code-block|syntax|javascript|218044|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Its available in androidx as following package

<pre><code>implementation "androidx.constraintlayout:constraintlayout:2.0.0-alpha1"
</code></pre>

blocks|key|218060|text|将约束布局依赖项从“1.0.0-字母2”更新为相关版本。在我的例子中，我更改为以下内容。编译'com.android.support.constraint:constraint-layout:2.0.0-alpha5‘|type|unstyled|depth|inlineStyleRanges|entityRanges|data|218061|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Update your constraint layout dependency to the relevant version from '1.0.0-alpha2'. In my case, I changed to the following.
compile 'com.android.support.constraint:constraint-layout:2.0.0-alpha5'

blocks|key|3653401|text|我在build.gradle(app)中在android下添加了以下脚本&我能够编译。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|3653402|compileOptions+{
++++sourceCompatibility+1.8
++++targetCompatibility+1.8
}|code-block|syntax|javascript|3653403|entityMap^0|2|H|L|7|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

I added the following script in build.gradle(app) under android &amp; I was able to compile.
<pre><code>compileOptions {
 sourceCompatibility 1.8
 targetCompatibility 1.8
}
</code></pre>

blocks|key|3653350|text|通过重新安装Android解决了类似的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3653351|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Similar issue solved by Reinstalling Android Studio.

blocks|key|3652935|text|​|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3652936|📷|atomic|offset|length|3652937|3652938|我正在尝试约束布局依赖更新1，插件级alpha-6，它起作用了|3652939|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/518c8325767dc5eda0afdec0291fde49.png|imageAlt^0|0|0|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@$E|U|F|V|1|W]]|A|$]]|$1|G|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q|R|-4]]]]

<a href="https://i.stack.imgur.com/e51gR.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/e51gR.png" alt="enter image description here"></a>

i'm try constraint layout dependency update available 1,and plugin gradle alpha-6,it worked

Problem :

<pre><code>Error:Could not find com.android.support.constraint:constraint-layout:1.0.0-alpha2.
Required by:
myapp:app:unspecified
</code></pre>

Background :
Android Studio 2.2 P 1

Gradle Sync failed could not find constraint-layout:1.0.0-alpha2

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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问题:Error:Could not find com.android.support.constraint:constraint-layout:1.0.0-alpha2.Required by:myapp:app:unspecified背景: AndroidStudio2.2P1

问Gradle同步失败找不到约束-布局:1.0.0-字母2
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问Gradle同步失败找不到约束-布局:1.0.0-字母2
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