blocks|key|2021096|text|尝试这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2021097|cd+android
gradlew+clean+
cd+..
react-native+run-android|code-block|syntax|javascript|2021098|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|$]]

Try to do this:

<pre><code>cd android
gradlew clean 
cd ..
react-native run-android
</code></pre>

blocks|key|1627441|text|我也遇到过类似的问题，./gradlew+clean也不能工作，但我从How+can+I+regenerate+ios+folder+in+React+Native+project?那里找到了hacky的解决方案|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1627442|删除安卓文件夹(可能也是ios+)，然后删除hacky+part+->：|1627443|react-native+upgrade+|code-block|syntax|javascript|1627444|(它会重新生成文件夹，但不应用于升级RN。)|1627445|然后|1627446|react-native+link
react-native+run-android|1627447|它对我很有效:)|1627448|编辑:观察到->+react-native有时会变得疯狂，无法运行某些命令。启动一个新的终端是有帮助的。怪异:)|1627449|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/42506068/how-can-i-regenerate-ios-folder-in-react-native-project^0|B|F|Z|1K|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@$9|15|A|16|B|C]]|D|@$9|17|A|18|1|19]]|E|$]]|$1|F|3|G|5|6|7|1A|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|1B|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1C|8|@]|D|@]|E|$]]|$1|O|3|P|5|6|7|1D|8|@]|D|@]|E|$]]|$1|Q|3|R|5|J|7|1E|8|@]|D|@]|E|$K|L]]|$1|S|3|T|5|6|7|1F|8|@]|D|@]|E|$]]|$1|U|3|V|5|6|7|1G|8|@]|D|@]|E|$]]|$1|W|3|-4|5|6|7|1H|8|@]|D|@]|E|$]]]|X|$Y|$5|Z|10|11|E|$12|13]]]]

I had similar problem, and <code>./gradlew clean</code> 
didn't work, but i found hacky solution from <a href="https://stackoverflow.com/questions/42506068/how-can-i-regenerate-ios-folder-in-react-native-project">How can I regenerate ios folder in React Native project?</a>

Delete android folder (probably ios too), and then hacky part ->:

<pre><code>react-native upgrade 
</code></pre>

(it regenerates folders, but it shouldn't be used to upgrade RN..) 

And then

<pre><code>react-native link
react-native run-android
</code></pre>

It worked for me :)

EDIT : one observation -> react-native sometimes goes crazy and cannot run some commands. Launching a new terminal helps. Bizarre :)

blocks|key|4131431|text|运行以下命令应该可以完成此任务：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4131432|sudo+rm+-rf+android/+ios/+#Delete+Android+and+ios+folders+first...
react-native+eject
react-native+upgrade+//rebuilds+android/ios+folders
react-native+link
react-native+run-android
react-native+run-ios|code-block|syntax|javascript|4131433|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|$]]

Running following commands should do the trick:

<pre><code>sudo rm -rf android/ ios/ #Delete Android and ios folders first...
react-native eject
react-native upgrade //rebuilds android/ios folders
react-native link
react-native run-android
react-native run-ios
</code></pre>

blocks|key|5549020|text|下面的命令将创建android和ios文件夹。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5549021|react-native+eject|code-block|syntax|javascript|5549022|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|$]]

Below command will create the android and ios folders.

<pre><code>react-native eject
</code></pre>

blocks|key|5549048|text|下面是我的解决方案：(我为android这样做)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5549049|第一个命令：(导航到react原生项目的Android文件夹)|5549050|cd+Android|code-block|syntax|javascript|5549051|第二条命令：|5549052|./gradlew+clean|5549053|第三个命令：|5549054|./gradlew+cleanBuildCache|5549055|我不喜欢删除android文件夹。(我认为这不是一个最好的方法)|5549056|生成用于生产的apk文件：(第一个来自/Android)(第二个来自根项目)|5549057|./gradlew+bundleRelease
react-native+run-android+--variant=release|5549058|编码快乐！|5549059|entityMap^0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|12|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|13|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|14|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|15|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|16|8|@]|9|@]|A|$G|H]]|$1|Q|3|R|5|6|7|17|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|18|8|@]|9|@]|A|$]]|$1|U|3|V|5|F|7|19|8|@]|9|@]|A|$G|H]]|$1|W|3|X|5|6|7|1A|8|@]|9|@]|A|$]]|$1|Y|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|Z|$]]

Here my solution: (I'm doing this for android)

First command:(Navigation to the Android folder of your react-native project)

<pre><code>cd Android
</code></pre>

Second command:

<pre><code>./gradlew clean
</code></pre>

Third commmand:

<pre><code>./gradlew cleanBuildCache
</code></pre>

I'm not fan of deleting android folder. (I think this not a best approaches)

To generate apk file for production: (First one from /Android)(second one from root project)

<pre><code>./gradlew bundleRelease
react-native run-android --variant=release
</code></pre>

Happy coding!!!

blocks|key|4131541|text|有趣的解决方案here创建一个新的react本机应用程序，复制新的android文件夹，然后运行$react-native+run-android|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4131542|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/facebook/react-native/issues/25526^0|7|4|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]]]]

Funny solution <a href="https://github.com/facebook/react-native/issues/25526" rel="nofollow noreferrer">here</a>
Create a new react native app and copy the new android folder over and then run $react-native run-android

blocks|key|2021299|text|是的，删除Android和IOS文件夹是安全的，您可以通过以下步骤再次删除：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2021300|1.第一种方法：react-native+eject+<=0.59.0|offset|length|style|BOLD|2021301|React-native在以前的版本中有这个命令。运行此命令将检查ios和android目录是否存在，然后重新构建缺少的目录。|2021302|sudo+rm+-rf+android/+ios/|2021303|react-native+eject+//将创建新的Android和IOS文件夹。|2021304|react-本机链接|2021305|react-原生运行-android|2021306|2.第二种方法：react-native+upgrade+--传统true>=0.60.0|2021307|现在你应该使用react-native+upgrade+--legacy+true命令来备份你的android文件夹或ios，因为这个命令将替换你的文件。|2021308|entityMap^0|0|8|R|0|0|0|0|0|0|8|11|0|7|Y|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Y|8|@$D|Z|E|10|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|11|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|12|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|13|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|14|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|15|8|@]|9|@]|A|$]]|$1|R|3|S|5|6|7|16|8|@$D|17|E|18|F|G]]|9|@]|A|$]]|$1|T|3|U|5|6|7|19|8|@$D|1A|E|1B|F|G]]|9|@]|A|$]]|$1|V|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]]|W|$]]

Yes, it is safe to delete the Android and IOS folder and you can make it again by following steps:

1.First Method:
react-native eject &lt;=0.59.0

React-native had this command in the previous version. Running this command will check if the ios and android directories exist and then rebuild whichever one is missing.

sudo rm -rf android/ ios/ 

react-native eject // Will create new Android and IOS folder.

react-native link

react-native run-android

2.Second Method: 
react-native upgrade --legacy true>=0.60.0 

Now you should use the react-native upgrade --legacy true command to back up your android folders or ios as the case may be as this command will replace your files.

blocks|key|5549157|text|如果您的react-native+>=+0.61.0版本：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|5549158|5549159|blockquote|5549160|5549161|5549162|sudo+rm+-rf+android/+ios/|ordered-list-item|5549163|5549164|添加react-native-eject的|5549165|yarn|5549166|5549167|5549168|npx+react-native+eject|5549169|5549170|享受吧！|5549171|entityMap^0|H|9|0|0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@$9|12|A|13|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|14|8|@]|D|@]|E|$]]|$1|G|3|-4|5|H|7|15|8|@]|D|@]|E|$]]|$1|I|3|-4|5|6|7|16|8|@]|D|@]|E|$]]|$1|J|3|-4|5|6|7|17|8|@]|D|@]|E|$]]|$1|K|3|L|5|M|7|18|8|@]|D|@]|E|$]]|$1|N|3|-4|5|6|7|19|8|@]|D|@]|E|$]]|$1|O|3|P|5|6|7|1A|8|@]|D|@]|E|$]]|$1|Q|3|R|5|M|7|1B|8|@]|D|@]|E|$]]|$1|S|3|-4|5|6|7|1C|8|@]|D|@]|E|$]]|$1|T|3|-4|5|6|7|1D|8|@]|D|@]|E|$]]|$1|U|3|V|5|M|7|1E|8|@]|D|@]|E|$]]|$1|W|3|-4|5|6|7|1F|8|@]|D|@]|E|$]]|$1|X|3|Y|5|6|7|1G|8|@]|D|@]|E|$]]|$1|Z|3|-4|5|6|7|1H|8|@]|D|@]|E|$]]]|10|$]]

The solution if ur version of react-native &gt;= 0.61.0 :
<blockquote>
<ol>
<li>sudo rm -rf android/ ios/
</li>
<li>yarn add react-native-eject
</li>
<li>npx react-native eject
</li>
</ol>
</blockquote>
enjoy !

blocks|key|2021351|text|EXPO用户：如果你使用过Expo，那么你可以运行expo+run:android|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|CODE|entityRanges|data|2021352|如果文件夹格式错误(或不存在)，它将被清除并重建。|2021353|entityMap^0|0|6|P|G|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@$9|L|A|M|B|C]|$9|N|A|O|B|D]]|E|@]|F|$]]|$1|G|3|H|5|6|7|P|8|@]|E|@]|F|$]]|$1|I|3|-4|5|6|7|Q|8|@]|E|@]|F|$]]]|J|$]]

EXPO users: If you've used Expo then you can run <code>expo run:android</code>
If the folder is malformed (or not present) it will clear and rebuild.

blocks|key|1627577|text|2022年1月:我正在使用windows。在我的VS代码终端中：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1627578|rm+android/+++|code-block|syntax|javascript|1627579|但要删除安卓和ios文件夹，首先你要做"rm+android/+ios/"，它可能会警告你的行动，接受。|offset|length|style|CODE|1627580|接下来：|1627581|npm+run+android+//rebuilds+android/ios+folders
npm+run+ios+//rebuilds+android/ios+folders|1627582|entityMap^0|0|0|J|I|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@$I|V|J|W|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|D|7|Y|8|@]|9|@]|A|$E|F]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

In 2022 January:
I am using windows.
Inside my VS code terminal:
<pre><code>rm android/ 
</code></pre>
But to delete Android and ios folders first you do <code>&quot;rm android/ ios/&quot;</code>
It may warn you of your action, accept.
Next:
<pre><code>npm run android //rebuilds android/ios folders
npm run ios //rebuilds android/ios folders
</code></pre>

I have messed the files up in the Android folder and would like to rebuild the Android project inside of the Android folder. How do I do this? 

Is it safe to delete the Android folder and then run <code>react-native run-android</code>, will that make it again?

Everything I've coded was wrote in <code>index.android.js</code>.

How to rebuild the entire Android folder?

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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我已经弄乱了Android文件夹中的文件，并希望在Android文件夹中重建Android项目。我该怎么做呢？删除Android文件夹然后运行react-native run-android安全吗，这会再次发生吗？我编写的所有代码都是用index.android.js编写的。

问如何重建整个Android文件夹？
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问如何重建整个Android文件夹？EN