blocks|key|3672116|text|转到项目结构设置，并将源代码兼容性和目标兼容性设置为当前的java开发工具包版本：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3672117|​|3672118|📷|atomic|offset|length|3672119|3672120|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/e990daf65ec0cf8d5ca9ff842fac1ae6.png|imageAlt^0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@$G|V|H|W|1|X]]|A|$]]|$1|I|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q|R|-4]]]]

Go to project structure settings and set Source Compatibility and Target Compatibility to your current java development kit version:

<img src="https://i.stack.imgur.com/Ox0hw.png" alt="List item">

blocks|key|3672308|text|只需将项目文件与gradle文件同步即可。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3672309|File+->+Sync+Project+with+Gradle+Files|code-block|syntax|javascript|3672310|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|$]]

Just you need to sync your project file with your gradle file.

<pre><code>File -&gt; Sync Project with Gradle Files
</code></pre>

blocks|key|2681702|text|我试过了这篇文章中的每一个答案，但我的问题只有在我完成这些步骤之后才得到解决：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2681703|文件->关闭项目->删除项目->打开现有项目(相同项目)|blockquote|2681704|也许这能给另一个有同样错误的人留出一个早晨。|2681705|编辑|offset|length|style|BOLD|2681706|我在MacBook上经常遇到这种情况。在我贴出这个答案之后，它一直在发生，所以我所做的是：|2681707|从App卸载Android版本；|unordered-list-item|2681708|从Android网站下载桌面稳定版本；|2681709|开始使用桌面版的Android。|2681710|再也没发生过。|2681711|entityMap^0|0|0|0|0|2|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|10|8|@]|9|@]|A|$]]|$1|E|3|F|5|6|7|11|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|12|8|@$I|13|J|14|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|15|8|@]|9|@]|A|$]]|$1|O|3|P|5|Q|7|16|8|@]|9|@]|A|$]]|$1|R|3|S|5|Q|7|17|8|@]|9|@]|A|$]]|$1|T|3|U|5|Q|7|18|8|@]|9|@]|A|$]]|$1|V|3|W|5|6|7|19|8|@]|9|@]|A|$]]|$1|X|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|Y|$]]

I tried every answer in this post but my problem only got resolved when I made these steps: 

<blockquote>
 File -> Close project -> Remove project -> Open existing project (same
 project)
</blockquote>

Maybe this will save a morning to another person with the same bug.

EDIT

This happened to me a lot on a MacBook. After I posted this answer it just kept happening so what I did was: 

<ul>
<li>uninstall the Android Studio version I had from the App Store;</li>
<li>download the desktop stable version from Android Studio website; </li>
<li>start using the desktop version of Android Studio.</li>
</ul>

Never happened again.

blocks|key|3672045|text|有时SDK路径将被错误地配置。你得修好它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3672046|设置/首选项(命令%2B，在mac上)。|ordered-list-item|3672047|搜索SDK|3672048|在Android下，单击编辑并指向文件系统上SDK目录的根目录。(如果没有安装SDk，请从下面的列表中安装)。|3672049|📷|atomic|offset|length|3672050|​|3672051|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/f6ff54041b6606f3590555542470d716.png|imageAlt^0|0|0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Z|8|@]|9|@]|A|$]]|$1|E|3|F|5|D|7|10|8|@]|9|@]|A|$]]|$1|G|3|H|5|D|7|11|8|@]|9|@]|A|$]]|$1|I|3|J|5|K|7|12|8|@]|9|@$L|13|M|14|1|15]]|A|$]]|$1|N|3|O|5|6|7|16|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|Q|$R|$5|S|T|U|A|$V|W|X|-4]]]]

Sometimes the SDK path will be incorrectly configured. You would need to fix it.

<ol>
<li>To Settings/Preferences( command + , on mac).</li>
<li>Search for SDK</li>
<li>Under Android SDK, click on edit and point it the root of sdk directory on your file system. (If ther is no SDk installed then install in from the below list).

<a href="https://i.stack.imgur.com/I81UX.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/I81UX.png" alt="enter image description here"></a></li>
</ol>

blocks|key|2681604|text|我建议你去build.gradle并再次同步。或工具->+Android+->同步项目与Gradle文件(Android+3%2B)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2681605|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 suggest you go to build.gradle and sync again.
Or Tools -> Android -> Sync Project with Gradle Files (Android 3+)

blocks|key|3672407|text|您需要19检查这个。https://developer.android.com/studio/releases/platforms|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3672408|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.android.com/studio/releases/platforms^0|A|1J|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]]]]

You need to insall SDK api 19 check this out.
<a href="https://developer.android.com/studio/releases/platforms" rel="nofollow noreferrer">https://developer.android.com/studio/releases/platforms</a>

blocks|key|3671838|text|转到sdk管理器并根据设备安装sdk，并检查设备api。如果您的设备是jellybean，那么就安装API19SDK。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3671839|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 sdk manager and install sdk according to your device and check your device api. Example if your device is jellybean then install api 19 sdk.

blocks|key|3671933|text|转到Tools>+Android+>+Setting，并确保您在系统设置下选择了默认设置。在这个映像中，我选择了Android7.1.1作为默认SDK|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3671934|​|3671935|📷|atomic|offset|length|3671936|3671937|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/ef24876626a8cdaf8e37b145301d8ff8.png|imageAlt^0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@$G|V|H|W|1|X]]|A|$]]|$1|I|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q|R|-4]]]]

Go to Tools> Android > SDK Manager and make sure you have selected default Setting under System Setting. In this image I have selected Android 7.1.1 as default SDK

<a href="https://i.stack.imgur.com/vHXG4.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/vHXG4.png" alt="enter image description here"></a>

blocks|key|3672195|text|我也有同样的问题，它对我起作用的只是和gradle同步。我只是做了我在这个类似的问题中发现的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3672196|How+do+I+"select+Android+SDK"+in+Android+Studio?|offset|length|3672197|最初的答案是：|3672198|转到build.gradle，现在单击同步。然后起作用了。最新情况：
使用Gradle文件创建->同步项目(AndroidStudio3.1.1)
Tools+->+Android+->+Gradle+Files+(AndroidStudio3.0.1)，也可以单击工具栏中的图标。
同步项目图标
当Android+studio团队致力于使这个工具更好的时候，这个答案可能对以后的版本没有帮助，同步的方法可能是
与下一个版本的Android不同。
常见的方法可能是尝试同步项目，然后使缓存失效并重新启动Android。
Android+3.1.2的解决方案|blockquote|3672199|在此之前，顺便说一句，我已经使缓存失效并重新启动，但是它没有工作。拜托，试着让我们知道。|3672200|在从Git导入一个项目之后，我遇到了这个问题，以防有人想要复制。|3672201|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/34353220/android-studio-please-select-android-sdk^0|0|0|1C|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@$D|Y|E|Z|1|10]]|A|$]]|$1|F|3|G|5|6|7|11|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|12|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|13|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|14|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

I had the same problem and what it worked for me was just sync with gradle.
I just did what I've found in this similar question:

<a href="https://stackoverflow.com/questions/34353220/android-studio-please-select-android-sdk">How do I &quot;select Android SDK&quot; in Android Studio?</a>

The original answer:

<blockquote>
 <blockquote>
 go to build.gradle and click sync now. Then it worked.
 </blockquote>
 
 Update :
 
 File -> Sync Project with Gradle Files (Android Studio 3.1.1)
 
 Tools -> Android -> Sync Project with Gradle Files (Android Studio
 3.0.1) Or You can click on the icon from the toolbar.
 
 Sync Project Icon

<pre><code>This answer may not help works for later version as Android studio Team work on making the tool more better, the way to sync may be
</code></pre>
 
 different in the next version of Android Studio.
 
 COMMON WAY that may helps is try to sync project and then Invalidate
 Caches and Restart Android Studio.
 
 Solution for Android Studio 3.1.2
</blockquote>

Before that, by the way, I had invalidated cache and restarted too, but it didn't work.
Please, try and let us know.

P.S.
I had this problem after I imported a project from Git, just in case someone would like to replicate.

blocks|key|3260787|text|​|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3260788|📷|atomic|offset|length|3260789|3260790|只需单击按钮.“带有gradle文件的同步项目”错误将被删除|3260791|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/e37f3e5fcef942fcd081a62e18f7e0b8.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]]]]

<img src="https://i.stack.imgur.com/j71Rg.png" alt="enter image description here">

Just click on the button ..."Sync Project with gradle file"
Error will be remove

Today I've installed Android Studio Canary 1

Now I cannot run my app. This following dialog appears.

I've already set the right SDK location through File-> Project Structure-> Android SDK location.

Expecting your help to solve this problem.

Warning Dialog image:

<a href="https://i.stack.imgur.com/Mh7OC.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Mh7OC.png" alt="enter image description here"></a>

Cannot run my app, asking to select Android SDK

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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今天我安装了安卓工作室金丝雀1现在我不能运行我的应用程序了。出现下面的对话框。我已经通过File-> > Android位置设置了正确的SDK位置。期待你的帮助来解决这个问题。警告对话框图像：​​

问无法运行我的应用程序，请求选择Android。
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