blocks|key|2788075|text|在模块设置对话框中删除并重新添加Android和Android-Gradle+Facets后，我修复了这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2788076|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|$]]

It was fixed for me after removing and re-adding the Android and Android-Gradle Facets in the Module Settings dialog.

blocks|key|2788111|text|我有类似的问题，当我选择我的项目的父目录，我解决了关闭项目导入项目从Android+Studio+->导入项目通过选择正确的build.gradle文件。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2788112|确保在导入时选择正确的build.gradle文件。|2788113|entityMap^0|P|U|1Q|C|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|P|8|@]|D|@]|E|$]]]|I|$]]

I had similar issue when I selected parent directory of my project, I resolved by Close Project -> Delete Project from Android Studio -> Import Project by selecting right build.gradle file. 

Make sure you select right build.gradle file while import.

blocks|key|2788121|text|在你的模块build.gradle文件中，确保你有正确的插件设置。它应该是|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2788122|apply+plugin:+'android'|code-block|syntax|javascript|2788123|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|$]]

In your module build.gradle file make sure you have the correct plugin set. it should be 

<pre><code>apply plugin: 'android'
</code></pre>

blocks|key|2788144|text|我将这一行添加到我的app.iml文件中，它可以正常工作|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2788145|orderEntry+type=“库”exported="“name="appcompat-v7-19.1.0”level=“项目”/>|2788146|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|$]]

I added this line to my app.iml file and it works 

orderEntry type="library" exported="" name="appcompat-v7-19.1.0" level="project" />

blocks|key|180889|text|我通过在模块设置中添加facet修复了这个问题。他们失踪了。右键单击项目>打开模块设置>+Facets+>+Add+facets+(顶部的"%2B“符号)>Android<代码>E211。在添加facet之后，您将拥有模块。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|180890|更新：|180891|对于最新版本的gradle，Facets已经被移除了，你现在可以直接添加模块了。右键单击项目>打开模块设置>+Add+module+(顶部的"%2B“符号)>+Phone++Tablet+Application+(现在您可以创建一个新模块并对其进行配置)。|180892|entityMap^0|4|4|U|6|11|6|19|6|1I|A|24|Y|0|0|3|0|0|1A|1B|6|1J|A|26|1C|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]|$9|O|A|P|B|C]|$9|Q|A|R|B|C]|$9|S|A|T|B|C]|$9|U|A|V|B|C]|$9|W|A|X|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|11|8|@$9|12|A|13|B|C]|$9|14|A|15|B|C]|$9|16|A|17|B|C]|$9|18|A|19|B|C]]|D|@]|E|$]]|$1|J|3|-4|5|6|7|1A|8|@]|D|@]|E|$]]]|K|$]]

I fixed this by adding facets in Module settings. They were missing.
right click on project > open Module settings > Facets > Add facets ( "+" sign at the top ) > Android.
After adding facets you will have modules. 
UPDATE: 
For latest version of gradle, Facets have been removed, you can directly add modules now.
right click on project > open Module settings > Add module ( "+" sign at the top ) > Phone and Tablet Application (Now you can create a new module and configure it).

blocks|key|178314|text|这对我很有效：文件>项目结构...>模块>绿色加号>导入>然后选择项目|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|178315|entityMap^0|7|S|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|$]]

This worked for me: File > Project Structure... > Modules > Green Plus Symbol > Import > Then Select The Project

blocks|key|3000625|text|确保您的build.gradle是|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|3000626|apply+plugin:+'com.android.application'|code-block|syntax|javascript|3000627|不|3000628|apply+plugin:+'com.android.library'|3000629|更改后，请再次同步您的gradle。|3000630|​|3000631|📷|atomic|3000632|3000633|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/95b4febb4a3af52d2a6000826accc3d2.png|imageAlt^0|4|C|0|0|0|0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|15|8|@$9|16|A|17|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|18|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|19|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|1A|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|1B|8|@]|D|@]|E|$]]|$1|Q|3|R|5|6|7|1C|8|@]|D|@]|E|$]]|$1|S|3|T|5|U|7|1D|8|@]|D|@$9|1E|A|1F|1|1G]]|E|$]]|$1|V|3|R|5|6|7|1H|8|@]|D|@]|E|$]]|$1|W|3|-4|5|6|7|1I|8|@]|D|@]|E|$]]]|X|$Y|$5|Z|10|11|E|$12|13|14|-4]]]]

Make sure your build.gradle is

<pre><code>apply plugin: 'com.android.application'
</code></pre>

not 

<pre><code>apply plugin: 'com.android.library'
</code></pre>

After you have changed, please sync your gradle again.

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

blocks|key|179026|text|似乎不同的解决方案对不同的人有效，对我来说，只是关闭项目并再次导入它就解决了问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|179027|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|$]]

It appears different solutions work for difference people, for me just closing the project and importing it again resolved the problem.

blocks|key|180979|text|转到安卓>>+Gradle+Scripts>>Build+Gradle(模块:app)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|180980|确保此文件的第一行如下所示。|180981|apply+plugin:+'com.android.application'|code-block|syntax|javascript|180982|不是这样的|180983|apply+plugin:+'com.android.library'|180984|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

goto Android >> Gradle Scripts>>Build Gradle(Module :app)

make sure the first line of this file is like this.

<pre><code>apply plugin: 'com.android.application'
</code></pre>

not like this

<pre><code>apply plugin: 'com.android.library'
</code></pre>

blocks|key|3000714|text|我在Android+Studio+1.3.1中通过执行以下操作成功修复了这个问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3000715|从File+->+New+->+New+Module|offset|length|style|CODE|3000716|Name+it+|unordered-list-item|3000717|创建一个不同的模块。‘by’|ordered-list-item|3000718|从现有库模块复制.iml文件并更改文件名称并重命名.iml文件中的引用|3000719|将模块名称添加到settings.gradle+|3000720|在应用程序的build.gradle文件中添加模块依赖项‘编译Libary并重新打开Android+Studio|3000721|Verify使Android+Studio将该模块识别为库(应该是粗体)|3000722|通过右键单击新创建的模块来重命名模块的目录和模块名称.|3000723|享受:)|3000724|3000725|3000726|entityMap^0|0|1|P|0|0|0|8|4|P|4|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|13|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|14|8|@$D|15|E|16|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|17|8|@]|9|@]|A|$]]|$1|K|3|L|5|M|7|18|8|@]|9|@]|A|$]]|$1|N|3|O|5|M|7|19|8|@$D|1A|E|1B|F|G]|$D|1C|E|1D|F|G]]|9|@]|A|$]]|$1|P|3|Q|5|M|7|1E|8|@]|9|@]|A|$]]|$1|R|3|S|5|M|7|1F|8|@]|9|@]|A|$]]|$1|T|3|U|5|M|7|1G|8|@]|9|@]|A|$]]|$1|V|3|W|5|M|7|1H|8|@]|9|@]|A|$]]|$1|X|3|Y|5|M|7|1I|8|@]|9|@]|A|$]]|$1|Z|3|-4|5|6|7|1J|8|@]|9|@]|A|$]]|$1|10|3|-4|5|6|7|1K|8|@]|9|@]|A|$]]|$1|11|3|-4|5|6|7|1L|8|@]|9|@]|A|$]]]|12|$]]

I managed to fix it in Android Studio 1.3.1 by doing the following:

<ol>
<li>Make a new module from <code>File -&gt; New -&gt; New Module</code></li>
<li>Name it something different, e.g. 'My Libary'</li>
<li>Copy an <code>.iml</code> file from an existing library module and change the name of the file and rename references in the <code>.iml</code> file</li>
<li>Add the module name to settings.gradle </li>
<li>Add the module dependency in your app's build.gradle file 'compile project(':mylibrary')'</li>
<li>Close and reopen Android Studio</li>
<li>Verify that Android Studio recognises the module as a library (should be bold)</li>
<li>Rename module's directory and module name by right clicking on the newly created module.</li>
<li>Enjoy :)</li>
</ol>

blocks|key|181004|text|我已经尝试了所有的选择，但都没有成功。因此，我最终得到了我的工作解决方案。只需执行以下步骤：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|181005|如果打开，请关闭|181006|。在当前的|ordered-list-item|181007|+studio中复制模块(项目)。|181008|您将在项目和include+':YOUR_MODULE_NAME'.|offset|length|style|CODE|181009|Sync+gradle的|181010|181011|+settings.gradle中看到已添加的模块，并且可以看到模块已成功添加到您的项目中。|181012|181013|entityMap^0|0|0|0|0|6|R|0|0|0|1|F|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|A|$]]|$1|G|3|H|5|F|7|Z|8|@]|9|@]|A|$]]|$1|I|3|J|5|F|7|10|8|@$K|11|L|12|M|N]]|9|@]|A|$]]|$1|O|3|P|5|F|7|13|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|F|7|14|8|@]|9|@]|A|$]]|$1|R|3|S|5|F|7|15|8|@$K|16|L|17|M|N]]|9|@]|A|$]]|$1|T|3|-4|5|6|7|18|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|19|8|@]|9|@]|A|$]]]|V|$]]

I have tried all the options with no luck. So I have ended up with my working solution. Just make following steps:

<ol>
<li>Close android studio if open.</li>
<li>Copy module(project) in your current workspace.</li>
<li>Start android studio.</li>
<li>You will see added module in project structure.</li>
<li>Open <code>settings.gradle</code> of your project and <code>include ':YOUR_MODULE_NAME'</code>.</li>
<li>Sync gradle and you can see module is successfully added to your project.</li>
</ol>

blocks|key|2788430|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2788431|有时在Android-manifest中会出现错误，因为在运行/调试配置上有一个类似十字的图像，所以为了以防万一，请尝试检查Android-manifest中是否有任何错误。|blockquote|2788432|2788433|entityMap^0|0|0|0^^$0|@$1|2|3|-4|4|5|6|G|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|H|7|@]|8|@]|9|$]]|$1|D|3|-4|4|5|6|I|7|@]|8|@]|9|$]]|$1|E|3|-4|4|5|6|J|7|@]|8|@]|9|$]]]|F|$]]

<blockquote>
 Sometimes the errors exists in Android-manifest because of that there
 is cross like image over run/debug configuration hence try to look
 over if Android-manifest has any errors in just case.
</blockquote>

blocks|key|2788440|text|这些类型的问题与AndroidManifest.xml相关，因此请检查AndroidManifest文件中的错误。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2788441|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|$]]

These types of problems are related to AndroidManifest.xml,
so check the bugs thats are in AndroidManifest file.

blocks|key|2788443|text|就我的情况而言，一个新手我搞砸了我的项目，不知道怎么做，但它不能再运行了，并抱怨清单，R，所有的东西。我意识到我的settings.gradle中有些东西没有include+':app'一旦我添加了这个，我又回到了我的路上。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2788444|entityMap^0|27|E|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|$]]

For my case, a newbie I boogered up my project, not sure how but it would not longer run and complained about the manifest, the R, everything. I realized that some how in my settings.gradle did not have <code>include ':app'</code> once I added this, I was back on my way.

blocks|key|2788454|text|这主要发生在您复制库项目并尝试构建它时。解决方案是添加|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2788455|apply+plugin:+'com.android.application'|code-block|syntax|javascript|2788456|在build.gradle文件中，而不是|2788457|apply+plugin:+'com.android.library'|2788458|然后执行gradle同步|2788459|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

This mainly happens when you copy a library project and try to build it. The solution would be to add 

<pre><code>apply plugin: 'com.android.application'
</code></pre>

in the build.gradle file, instead of 

<pre><code>apply plugin: 'com.android.library'
</code></pre>

Then do a gradle sync

blocks|key|3000808|text|下面的方法对我很有效：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3000809|3000810|编辑整个项目的'settings.gradle‘文件，并在底部添加一行以包含新模块(包括':myNewModule')+-例如：|unordered-list-item|3000811|3000812|include+':myNewModule'|code-block|syntax|javascript|3000813|3000814|同步gradle。|3000815|将build.gradle文件添加到您的新模块目录中。你需要确保第一行写着‘应用插件：'com.android.application’。如果您有其他模块，只需从项目中的另一个模块复制一个同步似乎就可以了。|3000816|Synch+Gradle|3000817|您的模块现在应该会显示在'Edit+Gradle|3000818|3000819|entityMap^0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|Z|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|10|8|@]|9|@]|A|$]]|$1|G|3|H|5|I|7|11|8|@]|9|@]|A|$J|K]]|$1|L|3|-4|5|6|7|12|8|@]|9|@]|A|$]]|$1|M|3|N|5|E|7|13|8|@]|9|@]|A|$]]|$1|O|3|P|5|E|7|14|8|@]|9|@]|A|$]]|$1|Q|3|R|5|E|7|15|8|@]|9|@]|A|$]]|$1|S|3|T|5|E|7|16|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|17|8|@]|9|@]|A|$]]|$1|V|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|W|$]]

The following worked for me:

<ul>
<li>edit the overall project's 'settings.gradle' file and add a line at the bottom to include your new module (include ':myNewModule') - e.g:</li>
</ul>

<pre class="lang-js prettyprint-override"><code>include ':myNewModule'
</code></pre>

<ul>
<li>Synch gradle.</li>
<li>Add a build.gradle file into your new module directory. You need to make sure the first line says 'apply plugin: 'com.android.application'. Simply copying a build.gradle from another module in your project, if you have one, seems to work.</li>
<li>Synch Gradle</li>
<li>Your module should now show up in 'Edit Configurations'</li>
</ul>

blocks|key|3000821|text|当我为com.android.library模块添加AndroidTests的配置时，我终于明白了为什么没有显示该模块。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3000822|如果您将库模块包含在应用程序的build.gradle中，如下所示：|3000823|compile+project(':yourlibrary')|code-block|syntax|javascript|3000824|因为对于库模块，默认情况下它是用release模式编译的，所以你不能对它运行Android+Tests，这就是为什么它不会显示在模块列表中。我通过以下修改修复了它：|3000825|将以下配置添加到库模块的build.gradle中：|3000826|+++++publishNonDefault+true|3000827|通过进行以下更改，您可以通过编辑应用程序模块的build.gradle来debug编译库，如下所示：|3000828|-++++compile+project(':yourlibrary')
%2B++++debugCompile+project(path:+':yourlibrary',+configuration:+'debug')
%2B++++releaseCompile+project(path:+':yourlibrary',+configuration:+'release')|3000829|然后同步它，你会发现它显示在列表中。|3000830|entityMap^0|3|J|0|F|C|0|0|G|7|12|D|0|C|C|0|0|N|C|10|5|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@$9|11|A|12|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|13|8|@$9|14|A|15|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|16|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|17|8|@$9|18|A|19|B|C]|$9|1A|A|1B|B|C]]|D|@]|E|$]]|$1|O|3|P|5|6|7|1C|8|@$9|1D|A|1E|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|J|7|1F|8|@]|D|@]|E|$K|L]]|$1|S|3|T|5|6|7|1G|8|@$9|1H|A|1I|B|C]|$9|1J|A|1K|B|C]]|D|@]|E|$]]|$1|U|3|V|5|J|7|1L|8|@]|D|@]|E|$K|L]]|$1|W|3|X|5|6|7|1M|8|@]|D|@]|E|$]]|$1|Y|3|-4|5|6|7|1N|8|@]|D|@]|E|$]]]|Z|$]]

I finally figure out why the module is not showed up when I add configuration for AndroidTests for a <code>com.android.library</code> module.

If you include your library module in your application's <code>build.gradle</code> like this:

<pre><code>compile project(':yourlibrary')
</code></pre>

Since for library module it is compiled with <code>release</code> mode by default, you can't run <code>Android Tests</code> for it, that's why it won't show up in the module list.
I fixed it with following modification:

Add following configuration to the <code>build.gradle</code> of your library module:

<pre><code> publishNonDefault true
</code></pre>

By make following changes, you can <code>debug</code> compile your library by editing the <code>build.gradle</code> of your application module like following:

<pre><code>- compile project(':yourlibrary')
+ debugCompile project(path: ':yourlibrary', configuration: 'debug')
+ releaseCompile project(path: ':yourlibrary', configuration: 'release')
</code></pre>

Then sync it and you'll find it shows in the list.

blocks|key|2788487|text|对我来说，只需重新启动Android+Studio就可以解决这个问题。就像Eclipse的好日子一样|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2788488|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|$]]

For me it was fixed by simply restarting Android Studio.. Like the good old days of Eclipse

blocks|key|178444|text|将模块添加到应用程序的.iml文件中，如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|178445|orderEntry+type="module"+module-name="yourmoudlename"+exported=""+|code-block|syntax|javascript|178446|这对我很管用。|178447|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Add your module in your applications .iml file like:

<pre><code>orderEntry type="module" module-name="yourmoudlename" exported="" 
</code></pre>

It works for me.

blocks|key|178449|text|好吧，所有的答案对我来说都不起作用。最后，单击Edit+Run>+Configuration。在左边，你可以选择一个新的主模块，并删除删除的模块。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|178450|entityMap^0|W|E|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|$]]

Well, nothing worked for me from all the answers. Finally, I clicked Run > Edit Configuration. On the left, u can choose a new main module and remove to deleted ones.

blocks|key|177045|text|在Android+Studio+3.1.2中，我也遇到了同样的问题。我通过点击“文件->与Gradle文件同步项目”解决了这个问题，.This为我工作。:)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|177046|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 Android Studio 3.1.2 I have faced the same issue. I resolved this issue by click on "File->Sync Project with Gradle Files".This works for me. :)

blocks|key|3000899|text|试一下，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3000900|文件>与Gradle文件同步项目或文件>与文件系统同步应该可以做到这一点。|3000901|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|$]]

Try,

Files > Sync Project with Gradle Files
or
Files > Sync with File System
Should do the trick.

blocks|key|181088|text|通过单击"File->Sync+Project+with+Gradle+Files“解决了此问题|type|unstyled|depth|inlineStyleRanges|entityRanges|data|181089|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|$]]

resolved this issue by clicking on "File->Sync Project with Gradle Files"

blocks|key|3000931|text|如果以上所有方法都不起作用。尝试更新您的Android+studio版本。步骤:+1.在Android+Studio中，选择File+>+Settings+(或者在Mac上选择Android+Studio+>+Preference+)。2.在左窗格中，选择外观和行为>系统设置>更新。3.确保选中自动检查更新，然后从下拉列表中选择一个频道。4.单击确定。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3000932|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|$]]

If all the above doesn't work. Try to update your Android studio version.
Steps:
1. In Android Studio, select File > Settings (or Android Studio > Preference on Mac).
2. In the left pane, select Appearance &amp; Behavior > System Settings > Updates.
3. Be sure that Automatically check for updates is checked, and then select a channel from the drop-down list.
4. Click OK.

blocks|key|179173|text|对我来说是这样的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|179174|OK|offset|length|style|CODE|179175|Right+|unordered-list-item|179176|
|179177|右键点击app项目文件夹，选择Load/Unload+Modules...|179178|179179|Select+app模块，点击Unload+>，点击Load/Unload+Modules...|179180|179181|Select，再次点击|179182|179183|，选择appapp模块，点击<+Load，点击Load/Unload+Modules...|179184|179185|Select|179186|179187|然后，app再次出现在配置列表中。|179188|entityMap^0|0|0|2|0|0|0|4|3|F|M|0|0|7|3|F|8|Q|M|0|0|0|0|3|6|E|6|N|M|0|0|0|0|3|3|0^^$0|@$1|2|3|4|5|6|7|15|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|16|8|@$D|17|E|18|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|19|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|1A|8|@]|9|@]|A|$]]|$1|M|3|N|5|J|7|1B|8|@$D|1C|E|1D|F|G]|$D|1E|E|1F|F|G]]|9|@]|A|$]]|$1|O|3|L|5|6|7|1G|8|@]|9|@]|A|$]]|$1|P|3|Q|5|J|7|1H|8|@$D|1I|E|1J|F|G]|$D|1K|E|1L|F|G]|$D|1M|E|1N|F|G]]|9|@]|A|$]]|$1|R|3|L|5|6|7|1O|8|@]|9|@]|A|$]]|$1|S|3|T|5|J|7|1P|8|@]|9|@]|A|$]]|$1|U|3|L|5|6|7|1Q|8|@]|9|@]|A|$]]|$1|V|3|W|5|J|7|1R|8|@$D|1S|E|1T|F|G]|$D|1U|E|1V|F|G]|$D|1W|E|1X|F|G]]|9|@]|A|$]]|$1|X|3|L|5|6|7|1Y|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|J|7|1Z|8|@]|9|@]|A|$]]|$1|10|3|-4|5|6|7|20|8|@]|9|@]|A|$]]|$1|11|3|12|5|6|7|21|8|@$D|22|E|23|F|G]]|9|@]|A|$]]|$1|13|3|-4|5|6|7|24|8|@]|9|@]|A|$]]]|14|$]]

For me it was:

<ol>
<li>Right click on <code>app</code> project folder &amp; select <code>Load/Unload Modules...</code></li>
<li>Select <code>app</code> module, click <code>Unload &gt;</code>, &amp; click <code>OK</code></li>
<li>Right click on <code>app</code> again &amp; select <code>Load/Unload Modules...</code></li>
<li>Select <code>app</code> module, click <code>&lt; Load</code>, &amp; click <code>OK</code></li>
</ol>

<code>app</code> then appeared for me in the configurations list again.

blocks|key|3000987|text|新项目。通过单击"File->Sync+Project+with+Gradle+Files“修复了此问题|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3000988|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|$]]

New project. Fixed this issue by clicking on "File->Sync Project with Gradle Files"

blocks|key|181125|text|以下是帮助您的方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|181126|181127|再次关闭并打开项目|ordered-list-item|181128|关闭并打开Android+Studio|181129|清理Project|181130|Rebuild+Project|181131|Instantiate并重新启动|181132|确保已包含项目|181133|<+:app|offset|length|style|CODE|181134|Import+>G216>|181135|181136|entityMap^0|0|0|0|0|0|0|0|0|2|4|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|11|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|12|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|13|8|@]|9|@]|A|$]]|$1|H|3|I|5|E|7|14|8|@]|9|@]|A|$]]|$1|J|3|K|5|E|7|15|8|@]|9|@]|A|$]]|$1|L|3|M|5|E|7|16|8|@]|9|@]|A|$]]|$1|N|3|O|5|E|7|17|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|18|8|@$R|19|S|1A|T|U]]|9|@]|A|$]]|$1|V|3|W|5|E|7|1B|8|@]|9|@]|A|$]]|$1|X|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]|$1|Y|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]]|Z|$]]

The following are methods to help you:

<ol>
<li>Close and Open Project again </li>
<li>Close and Open Android Studio</li>
<li>Clean Project</li>
<li>Rebuild Project</li>
<li>Instantiate and Restart</li>
<li>Make sure you have included <code>:app</code></li>
<li>Import the Project</li>
</ol>

blocks|key|3001034|text|使用导入选项(+projects|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3001035|Remove+project-+Gradle，Eclipse，|unordered-list-item|3001036|-Gradle，Eclipse等)从Android+Studio向导中最近的项目中重新启动Android+Studio+|ordered-list-item|3001037|使用导入选项(+project+-Gradle，Eclipse等)。不是打开existing|3001038|Project+AS项目|3001039|文件->同步项目与gradle文件|3001040|3001041|3001042|3001043|entityMap^0|0|0|0|1|1|1|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$]]|$1|E|3|F|5|G|7|U|8|@]|9|@]|A|$]]|$1|H|3|I|5|G|7|V|8|@]|9|@]|A|$]]|$1|J|3|K|5|G|7|W|8|@]|9|@]|A|$]]|$1|L|3|M|5|G|7|X|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|10|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|R|$]]

<ol>
<li>Close all Android Studio projects</li>
<li>Remove the project from the recent projects in Android Studio wizard</li>
<li>Restart Android Studio</li>
<li>Use import option (Import project- Gradle, Eclipse ADT, etc.) instead of open an existing</li>
<li>Project AS project</li>
<li>File -> Sync project with gradle files</li>
</ol>

blocks|key|177138|text|在我的例子中，问题来自build.gradle(应用程序)中更高的(或未下载的)+compileSdkVersion和targetSdkVersion。这是因为在另一台未下载sdk镜像的pc上克隆项目时发生的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|177139|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 problem was from a higher (or not downloaded) compileSdkVersion and targetSdkVersion in build.gradle(app).
This was happened because of cloning project in another pc that not downloaded that sdk image.

blocks|key|2788719|text|之前的答案对我都不起作用，所以我删除并重新安装了Android+Studio。就像一个护身符。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2788720|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|$]]

None of the previous answers worked for me, so I deleted and reinstalled Android Studio. Worked like a charm.

blocks|key|178525|text|在我的例子中，问题出在SDK许可证的接受上。通过下载正确的SDK版本并通过SDK管理器接受许可，解决了此问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|178526|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 the problem was with SDK license acceptance.
The problem was solved by downloading proper SDK version and license acceptance via SDK Manager.

blocks|key|3001101|text|未检测到任何配置，因为集成开发环境无法检测compileSdkVersion的模块(<no+module>)，并且buildToolsVersion+in+28in+build.gradle+(app模块)|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|CODE|entityRanges|data|3001102|++android+{
++++++++.
++++++++.
++++++++compileSdkVersion+28
++++++++buildToolsVersion+28
++++++++.
++++++++.
++}|code-block|syntax|javascript|3001103|但未安装SDK。因此，我首先安装了它，它为我工作！|3001104|​|3001105|📷|atomic|3001106|3001107|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/fdfb4b246a6a74d6ffda61ac24e8143d.png|imageAlt^0|L|H|1L|H|26|2|2B|C|16|B|0|0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@$9|13|A|14|B|C]|$9|15|A|16|B|C]|$9|17|A|18|B|C]|$9|19|A|1A|B|C]|$9|1B|A|1C|B|D]]|E|@]|F|$]]|$1|G|3|H|5|I|7|1D|8|@]|E|@]|F|$J|K]]|$1|L|3|M|5|6|7|1E|8|@]|E|@]|F|$]]|$1|N|3|O|5|6|7|1F|8|@]|E|@]|F|$]]|$1|P|3|Q|5|R|7|1G|8|@]|E|@$9|1H|A|1I|1|1J]]|F|$]]|$1|S|3|O|5|6|7|1K|8|@]|E|@]|F|$]]|$1|T|3|-4|5|6|7|1L|8|@]|E|@]|F|$]]]|U|$V|$5|W|X|Y|F|$Z|10|11|-4]]]]

No configuration was deteched because IDE was unable to detech modules (<code>&lt;no module&gt;</code>).My compileSdkVersion and buildToolsVersion was 28 in build.gradle (app module)
<pre><code> android {
 .
 .
 compileSdkVersion 28
 buildToolsVersion 28
 .
 .
 }
</code></pre>
But SDK was not installed. So then I installed it first and it worked for me !!!
<a href="https://i.stack.imgur.com/v0Aru.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/v0Aru.png" alt="enter image description here" /></a>

blocks|key|179298|text|Android+Studio+4%2B|type|unstyled|depth|inlineStyleRanges|entityRanges|data|179299|1-文件->关闭项目|179300|2-删除.idea文件夹|179301|3-再次打开项目|179302|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

Android Studio 4+
1- File -&gt; Close project
2- Delete .idea folder
3- Open project again

blocks|key|2788786|text|上面的解决方案对我来说都不起作用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2788787|我刚刚将build.gradles中的com.android.tools.build:gradle:7.0.0版本升级到了最新版本(目前是7.0.2)，并且它起作用了！|offset|length|style|CODE|2788788|​|2788789|📷|atomic|2788790|2788791|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/88fabb6ac4da44ac55e00181193133af.png|imageAlt^0|0|J|10|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]]|9|@]|A|$]]|$1|H|3|I|5|6|7|10|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|11|8|@]|9|@$D|12|E|13|1|14]]|A|$]]|$1|M|3|I|5|6|7|15|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|16|8|@]|9|@]|A|$]]]|O|$P|$5|Q|R|S|A|$T|U|V|-4]]]]

None of the above solutions worked for me.
I just upgraded the version of <code>com.android.tools.build:gradle:7.0.0</code> in build.gradles to the latest version (currently 7.0.2) and it worked!
<a href="https://i.stack.imgur.com/WNBmD.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/WNBmD.png" alt="upgrading gradle dependency" /></a>

I've imported a project to Android Studio with several subprojects. 

I want to run a subproject.

I successfully made this subproject's build.gradle as a module. 

In order to run it, I went to Run > edit configurations > + > Android Application. 

Problem: When I try to select a module, none show up in the drop down list. 

Why is this? 

EDIT: it shows up as a module under Groovy but not showing under Android Application. How do I get it to show up under Android Application?

Android Studio: Module won't show up in "Edit Configuration"

集成开发环境

Android Studio

文件系统

Android

Eclipse

我已经将一个项目导入到Android Studio中，其中包含几个子项目。我想运行一个子项目。我成功地将这个子项目的build.gradle作为一个模块。为了运行它，我选择了运行>编辑配置>+> Android应用程序。问题:当我尝试选择一个模块时，下拉列表中没有显示。为什么会这样呢？编辑:它在Groovy下显示为一个...

问Android Studio:模块不会在“编辑配置”中显示
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问Android Studio:模块不会在“编辑配置”中显示
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