blocks|key|590730|text|使用Gradles文件转到File+>+Sync项目。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|590731|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|$]]

Go to File > Sync Project with Gradles Files.

blocks|key|2629485|text|退出Android+Studio+(不关闭项目Quit+Android+Studio)，然后打开项目并转到Android+Studio+>+Build+>+Clean+Project|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2629486|然后Android+Studio+>+File+>+Sync+Project+with+Gradles+Files如下图所示|2629487|​|2629488|📷|atomic|2629489|2629490|如果您的问题仍然存在，请单击下面的图作为安装构建工具，然后单击Android+Studio+>+File+>+Sync+Project+with+Gradles+Files|2629491|2629492|2629493|2629494|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/242dea1b7a3b2e5a464da1f283434924.jpg|imageAlt|1|https://developer.qcloudimg.com/http-save/yehe-900000/7651b2ae49f43ec84537ed0270d9413a.jpg^0|2|E|N|4|S|E|1H|12|0|2|1J|0|0|0|1|0|0|0|V|1J|0|0|0|1|1|0|0^^$0|@$1|2|3|4|5|6|7|13|8|@$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|@$9|1D|A|1E|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|1F|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|1G|8|@]|D|@$9|1H|A|1I|1|1J]]|E|$]]|$1|M|3|I|5|6|7|1K|8|@]|D|@]|E|$]]|$1|N|3|O|5|6|7|1L|8|@$9|1M|A|1N|B|C]]|D|@]|E|$]]|$1|P|3|I|5|6|7|1O|8|@]|D|@]|E|$]]|$1|Q|3|K|5|L|7|1P|8|@]|D|@$9|1Q|A|1R|1|1S]]|E|$]]|$1|R|3|I|5|6|7|1T|8|@]|D|@]|E|$]]|$1|S|3|-4|5|6|7|1U|8|@]|D|@]|E|$]]]|T|$U|$5|V|W|X|E|$Y|Z|10|-4]]|11|$5|V|W|X|E|$Y|12|10|-4]]]]

Quit the <code>Android Studio</code> ( not close the project <code>Quit</code> the <code>Android Studio</code>) then open the project and go to <code>Android Studio &gt; Build &gt; Clean Project</code> 

Then 
<code>Android Studio &gt; File &gt; Sync Project with Gradles Files</code> as the pic below

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

If your problem still exists then click the Install build tool as the pic below and then 
<code>Android Studio &gt; File &gt; Sync Project with Gradles Files</code>

<a href="https://i.stack.imgur.com/xY1lD.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/xY1lD.jpg" alt="enter image description here"></a>

blocks|key|3298817|text|所有这些都不适合我。对我有用的是去File+->+Invalidate+Caches+/+Restart|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3298818|entityMap^0|H|Z|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

None of the above worked for me. what worked for me is to go to <code>File -&gt; Invalidate Caches / Restart</code>

blocks|key|590725|text|即使在多次成功地重建我的项目之后，我也面临着同样的问题。我结束了这个项目，重新开始，问题解决了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|590726|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 faced same issue even after rebuilding my project multiple times successfully. I closed the project and re-opened, issue resolved.

blocks|key|591739|text|首先，在项目中的所有模块中找到您的build.gradle，包括app/build.gradle。查找compileSdkVersion内部的android标记，在本例中，编译sdk版本为30：|type|ordered-list-item|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|591740|​|unstyled|591741|📷|atomic|591742|591743|接下来，打开SDK管理器>+SDK平台，检查是否有模块使用的安装SDK版本，然后应用于安装选定的平台。安装后，转到菜单文件>同步项目与Gradle文件.。|BOLD|591744|591745|591746|591747|这个问题经常出现在项目有很多模块时，每个模块使用不同的编译SDK版本，所以应用程序可能能够构建，但是IDE在处理资源时有一些问题。|591748|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/c943d4e20f8e53871188c5570621934f.png|imageAlt|1|https://developer.qcloudimg.com/http-save/yehe-900000/06625a710cd11559763ea1bb7c9b4122.png^0|H|C|W|G|1F|H|1Z|7|0|0|0|1|0|0|0|6|D|1N|H|0|0|0|1|1|0|0|0^^$0|@$1|2|3|4|5|6|7|15|8|@$9|16|A|17|B|C]|$9|18|A|19|B|C]|$9|1A|A|1B|B|C]|$9|1C|A|1D|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|1E|8|@]|D|@]|E|$]]|$1|I|3|J|5|K|7|1F|8|@]|D|@$9|1G|A|1H|1|1I]]|E|$]]|$1|L|3|G|5|H|7|1J|8|@]|D|@]|E|$]]|$1|M|3|N|5|6|7|1K|8|@$9|1L|A|1M|B|O]|$9|1N|A|1O|B|O]]|D|@]|E|$]]|$1|P|3|G|5|H|7|1P|8|@]|D|@]|E|$]]|$1|Q|3|J|5|K|7|1Q|8|@]|D|@$9|1R|A|1S|1|1T]]|E|$]]|$1|R|3|G|5|H|7|1U|8|@]|D|@]|E|$]]|$1|S|3|T|5|H|7|1V|8|@]|D|@]|E|$]]|$1|U|3|-4|5|H|7|1W|8|@]|D|@]|E|$]]]|V|$W|$5|X|Y|Z|E|$10|11|12|-4]]|13|$5|X|Y|Z|E|$10|14|12|-4]]]]

<ol>
<li>First, find your <code>build.gradle</code> in your all modules in project, include <code>app/build.gradle</code>. Find the <code>compileSdkVersion</code> inside <code>android</code> tag, in this case, compile sdk version is 30:</li>
</ol>
<a href="https://i.stack.imgur.com/7OrW3.png" rel="noreferrer"><img src="https://i.stack.imgur.com/7OrW3.png" alt="In this case, SDK version is 30" /></a>
<ol start="2">
<li>Next, open SDK Manager &gt; SDK Platforms, check for install SDK versions that there modules using, then apply to install selected platforms.
After installed, go to menu File &gt; Sync project with Gradle files....</li>
</ol>
<a href="https://i.stack.imgur.com/n4hEB.png" rel="noreferrer"><img src="https://i.stack.imgur.com/n4hEB.png" alt="Install the API version which module requires" /></a>
This issue often appear when project has many modules, each module use different compile SDK version, so app may be able to build but IDE have some issue while processing your resources.

blocks|key|2629204|text|只需重新启动Android即可。在我的例子中，在启动Android之前我是离线的，但是当我重新启动的时候我是在线的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2629205|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|$]]

Simply restart the Android Studio. In my case, I was offline before starting the Android Studio, but online when I did restart.

blocks|key|590538|text|做这个|type|unstyled|depth|inlineStyleRanges|entityRanges|data|590539|构建->重建项目|590540|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|$]]

Do this

Build -> Rebuild Project

blocks|key|3298337|text|安装缺少的平台和同步项目|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3298338|📷|atomic|offset|length|3298339|​|3298340|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/70c06e5f3979009bb2ffd4eb0d99913c.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]]]]

Install missing plataform and sync project
<a href="https://i.stack.imgur.com/HiRKw.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/HiRKw.png" alt="[press to install automatically]"></a>

blocks|key|2629069|text|在启动android工作室之前上网。然后按照屏幕上的步骤转到文件->New。然后等待，它将下载必要的文件通过互联网。这应该能解决问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2629070|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|$]]

Go online before starting android studio. Then go file->New project
Follow onscreen steps. Then wait It will download the necessary files over internet. And that should fix it.

blocks|key|3298365|text|在我的build.gradle文件中添加了一行之后，我就遇到了这个问题。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3298366|compile+'com.balysv:material-ripple:1.0.2'|code-block|syntax|javascript|3298367|解决方案：我将这一行更改为|BOLD|3298368|implementation+'com.balysv:material-ripple:1.0.2'|3298369|然后按下sync+again。|3298370|塔达！一切都恢复正常了。|3298371|entityMap^0|3|C|0|0|0|5|0|0|4|A|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@$9|W|A|X|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|Y|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Z|8|@$9|10|A|11|B|M]]|D|@]|E|$]]|$1|N|3|O|5|H|7|12|8|@]|D|@]|E|$I|J]]|$1|P|3|Q|5|6|7|13|8|@$9|14|A|15|B|C]]|D|@]|E|$]]|$1|R|3|S|5|6|7|16|8|@]|D|@]|E|$]]|$1|T|3|-4|5|6|7|17|8|@]|D|@]|E|$]]]|U|$]]

I got this problem after i added a line in my <code>build.gradle</code> file.

<pre><code>compile 'com.balysv:material-ripple:1.0.2'
</code></pre>

Solution:
I changed this line to 

<pre><code>implementation 'com.balysv:material-ripple:1.0.2'
</code></pre>

and then pressed <code>sync again</code>.

Tada! all was working again.

blocks|key|2629514|text|在我的例子中，这是因为我不喜欢把minSDK和targeSdk留在清单中。去想一想。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2629515|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|$]]

In my case, it was because it didn't like that I left the minSDK and targeSdk in the manifest. Go figure.

blocks|key|3298854|text|只需单击android工作室中的文件，然后单击带有Gradle文件的同步项目。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3298855|如果不能工作，请单击“生成”，单击“清洁项目”。|3298856|它总是对我起作用|3298857|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|$]]

just click file in your android studio
then click Sync Project with Gradle Files..

if it won't work,
click Build
click Clean Project.

it always work for me

blocks|key|3299512|text|项目对targetSdkVersion所需的Android级别可能不存在。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3299513|检查IDE的事件日志选项卡的控制台，以查看任何错误，例如。以下类型：|BOLD|3299514|Gradle+sync+failed:
com.android.tools.idea.gradle.project.sync.idea.issues.SdkPlatformNotFoundException:
Module:+'common'+platform+'android-29'+not+found.|code-block|syntax|javascript|3299515|然后在SDK管理器->+SDK平台中安装一些API级别(29)，最后再安装同步。|3299516|entityMap^0|3|G|0|6|4|0|0|3|E|0^^$0|@$1|2|3|4|5|6|7|R|8|@$9|S|A|T|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|U|8|@$9|V|A|W|B|H]]|D|@]|E|$]]|$1|I|3|J|5|K|7|X|8|@]|D|@]|E|$L|M]]|$1|N|3|O|5|6|7|Y|8|@$9|Z|A|10|B|H]]|D|@]|E|$]]|$1|P|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|Q|$]]

The Android SDK Platform API Level that the project requires for <code>targetSdkVersion</code> may not exist.
Check the console of the Event Log tab of the IDE to see any errors eg. of the following type:
<pre><code>Gradle sync failed:
com.android.tools.idea.gradle.project.sync.idea.issues.SdkPlatformNotFoundException:
Module: 'common' platform 'android-29' not found.
</code></pre>
Then install some API Level (29) in SDK Manager -&gt; SDK Platforms and finally Sync again.

blocks|key|590524|text|在Notepad%2B%2B中编辑xml文件并重新构建它。这是我的工作|type|unstyled|depth|inlineStyleRanges|entityRanges|data|590525|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|$]]

Edit you xml file in Notepad++ and build it again. It's work for me

blocks|key|591234|text|我有最新的AndroidStudio3.6.1，但无法构建一个简单的'Hello‘应用程序，如这里所记录的"https://codelabs.developers.google.com/codelabs/android-training-hello-world/index.html?index=..%252F..%252Fandroid-training#3“。我应用了上面讨论过的各种步骤，包括两个最可行的方案，它们应该真正解决这个问题，|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|591235|‘文件->具有分级文件的同步项目’和|ordered-list-item|style|BOLD|591236|“文件->使缓存无效/重新启动”，但没有效果。|591237|尽管如此，我怀疑标准答案应该是这2种选项中的一种，但对于我来说，只有在我进入'File->Project+Structure‘并检查了我的SDK版本配置后，我才能获得分辨率！Android和Gradle使用不同的JDK版本和位置。|591238|Android：+C:\Program+Files\Java\jdk1.8.0_241|unordered-list-item|591239|级：+C:\Program+\JavaJDK-13.0.2|591240|我以前通过从ORACLE下载最新的JAVA来定义我的JAVA_HOME环境变量。Gradle使用的是%25JAVA_HOME%25+JAVA版本和Android，这是随着Android而来的内置SDK。|591241|有一次，我把这两个版本都换成了JDK1.8。*(只要是JDK1.8，任何版本都可以。那么简单的‘文件->同步.’选择对我来说很好！|591242|祝您好运--只有当您陷入困境时，解决方案才会处于这两个选项之间，只需确保您验证了所引用的JDK版本！|591243|entityMap|0|LINK|mutability|MUTABLE|url|https://codelabs.developers.google.com/codelabs/android-training-hello-world/index.html?index=..%252F..%252Fandroid-training#3^0|1I|3E|0|0|1|F|0|1|E|0|0|0|8|0|0|2|0|0|0|0^^$0|@$1|2|3|4|5|6|7|15|8|@]|9|@$A|16|B|17|1|18]]|C|$]]|$1|D|3|E|5|F|7|19|8|@$A|1A|B|1B|G|H]]|9|@]|C|$]]|$1|I|3|J|5|F|7|1C|8|@$A|1D|B|1E|G|H]]|9|@]|C|$]]|$1|K|3|L|5|6|7|1F|8|@]|9|@]|C|$]]|$1|M|3|N|5|O|7|1G|8|@$A|1H|B|1I|G|H]]|9|@]|C|$]]|$1|P|3|Q|5|O|7|1J|8|@$A|1K|B|1L|G|H]]|9|@]|C|$]]|$1|R|3|S|5|6|7|1M|8|@]|9|@]|C|$]]|$1|T|3|U|5|6|7|1N|8|@]|9|@]|C|$]]|$1|V|3|W|5|6|7|1O|8|@]|9|@]|C|$]]|$1|X|3|-4|5|6|7|1P|8|@]|9|@]|C|$]]]|Y|$Z|$5|10|11|12|C|$13|14]]]]

I have the latest Android Studio 3.6.1 and yet couldn't build a simple 'Hello World' app as documented here "<a href="https://codelabs.developers.google.com/codelabs/android-training-hello-world/index.html?index=..%2F..%2Fandroid-training#3" rel="nofollow noreferrer">https://codelabs.developers.google.com/codelabs/android-training-hello-world/index.html?index=..%2F..%2Fandroid-training#3</a>". 
I applied various steps discussed above including the 2 most viable options which should have really solved this issue, 

<ol>
<li>'File->Sync Project with Gradle Files' and </li>
<li>'File->Invalidate Caches/Restart' but to no avail.</li>
</ol>

Even though, I suspect standard answer should be one of these 2 options only for most, but for me the resolution came only after I went inside the 'File->Project Structure' and checked my SDK versions configured!
Android Studio and Gradle were using different JDK versions and locations.

<ul>
<li>Android Studio: C:\Program Files\Java\jdk1.8.0_241</li>
<li>Gradle: C:\Program Files\Java\jdk-13.0.2</li>
</ul>

I had previously defined my JAVA_HOME environment variable by downloading latest JAVA SDK on my own from ORACLE website. Where Gradle was using the %JAVA_HOME% JAVA SDK version and Android Studio the built in SDK which came along with Android Studio. 

Once I switched both to versions JDK 1.8.* (Any version as long as it is JDK 1.8. for that matter*) then simple 'File->Synch...' option worked perfectly fine for me! 

Good luck the solution is in between one of these 2 options only if you are stuck, just ensure you validate JDK versions being referred to!

blocks|key|3298954|text|这个问题有不同的解决方案，但我首先必须检查(build.gradle)，也许它是空的。这尤其是如果您下载了代码，而不是创建了|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3298955|您会发现这一行"//顶级构建文件，您可以在其中添加所有子项目/模块共有的配置选项。“在这种情况下，您需要打开一个新项目并制作副本-paste.然后检查SDK和其他必须同步的settings.finally。|3298956|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|$]]

there are different solutions to this problem but I at the first u have to check to (build.gradle) maybe it empty. this especially if u downloaded code, not u created 
and u will find just this line "// Top-level build file where you can add configuration options common to all sub-projects/modules."
 in this case, u need to open a new project and make copy-paste.then check the SDK and other settings.finally u have to sync

blocks|key|2629709|text|在我的例子中，Windows+Firewall阻止Android+(即Android的jre/bin文件夹中的java.exe+)连接到站点和下载数据。在Windows问我是否想让应用程序通过防火墙后，我不得不手动同步File+->+Sync+project+with+gradle+files。在那之后，事情仍然不正常，需要从Tools+->+SDK+Manager手动下载SDK+28。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2629710|entityMap^0|7|G|17|7|1J|8|31|12|4K|K|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]|$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|G|$]]

In my case, the <code>Windows Firewall</code> was blocking Android Studio (i.e. <code>java.exe</code> from Android Studio's <code>jre/bin</code> folder) from connecting to sites and downloading data. After Windows asked me if I wanted to allow the app through the firewall, I had to do a manual sync <code>File -&gt; Sync project with gradle files</code>. After that, things were still disfunctional, a manual download of an SDK version 28 was necessary from <code>Tools -&gt; SDK Manager</code>.

blocks|key|2629748|text|如果您在有代理服务器的公司设置中，请再次检查代理设置。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2629749|Go文件->设置|ordered-list-item|2629750|寻找代理。|2629751|填写批准书。|2629752|测试连接。|2629753|如果你认为你的密码是胖手指的，你可以点击一个清晰的密码按钮，在那里你可以重新输入你的信用卡。HTH|2629754|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$]]|$1|E|3|F|5|D|7|Q|8|@]|9|@]|A|$]]|$1|G|3|H|5|D|7|R|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|S|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|T|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|U|8|@]|9|@]|A|$]]]|N|$]]

If you are in corporate setting where there is a proxy server, double check your proxy settings. 

<ol>
<li>Go File -> Settings</li>
<li>Search for Proxy. </li>
<li>Fill out as appropreate. </li>
<li>Test connection. </li>
</ol>

If you think you fat-fingered the password, there is a Clear passwords button you can click to where you can re-enter your creds. HTH

blocks|key|2629231|text|我试图更改SDK版本：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2629232|查看下面的图片:我将27从安卓P改为|offset|length|style|BOLD|2629233|​|2629234|📷|atomic|2629235|2629236|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/3f7680c99a9526e0e8d3b38bdaeb2b48.png|imageAlt^0|0|A|2|D|3|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@$D|Y|E|Z|F|G]|$D|10|E|11|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|12|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|13|8|@]|9|@$D|14|E|15|1|16]]|A|$]]|$1|M|3|I|5|6|7|17|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|O|$P|$5|Q|R|S|A|$T|U|V|-4]]]]

I had tried to change SDK Version:

Check below image: In that I changed 27 from Android P

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

I started to learn Android Studio. I try to echo out simple &quot;Hello World&quot;:
<pre><code>&lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
&lt;RelativeLayout
 android:id=&quot;@+id/activity_main&quot;
 xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
 xmlns:tools=&quot;http://schemas.android.com/tools&quot;
 android:layout_width=&quot;match_parent&quot;
 android:layout_height=&quot;match_parent&quot;
 android:paddingLeft=&quot;16dp&quot;
 android:paddingRight=&quot;16dp&quot;
 android:paddingTop=&quot;16dp&quot;
 android:paddingBottom=&quot;16dp&quot;
 tools:context=&quot;.MainActivity&quot;&gt;

 &lt;TextView
 android:layout_width=&quot;wrap_content&quot;
 android:layout_height=&quot;wrap_content&quot;
 android:text=&quot;Hello World!&quot; /&gt;

&lt;/RelativeLayout&gt;
</code></pre>
but when I clicked &quot;design&quot; view, this error is showing?
<blockquote>
Design editor is unavailable until a successful build
</blockquote>
How can I fix this error.
<a href="https://i.stack.imgur.com/mf1cP.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/mf1cP.png" alt="enter image description here" /></a>
<a href="https://i.stack.imgur.com/5CfeX.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/5CfeX.png" alt="enter image description here" /></a>
I just noticed that my xml code is causing error. Is that why this may be not working?

How can I fix "Design editor is unavailable until a successful build" error?

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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我开始学习安卓工作室。我试着重复简单的“你好世界”：<?xml version="1.0" encoding="utf-8"?><RelativeLayout android:id="@+id/activity_main" xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://

问如何修复“设计编辑器在成功构建之前不可用”错误？
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