blocks|key|547584|text|检查您的XML资源(特别是最近编辑的资源)中是否有错误和sytax错误。当其中一个文件出现错误时，R类自动生成将中止。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|547585|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|$]]

Check your XML resources (especially these recently edited) for mistakes and sytax errors. When you have an error inside one of these files, the R class autogeneration will abort.

blocks|key|764378|text|当您的某个xml文件中有错误时(例如，找不到资源)，就会发生这种情况。这也可能因为使用菜单而发生(我因为菜单而遇到过这个问题，我必须删除它们，清理它们，然后重新添加它们)。另一个可能的原因是，您最初不希望将R类放在创建它的默认位置，而是放在自己的包中。因此，有可能R是在它的默认位置创建的，而你的程序在其他地方寻找它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|764379|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|$]]

This can happen when you have an error in one of your xml files (for example, a resource cannot be found). This can also happen because of using menus (I have had this problem because of menus, and I had to remove them, clean and add them again). And another possible reason is that you initially wanted to have your R class not in the default place where it is created but in your own package. So it is possible that R is created in its default location and your program is looking for it somewhere else.

blocks|key|547681|text|检查您是否意外导入了android.R，这也会给出一个资源错误。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|547682|entityMap^0|A|9|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|$]]

Check if you accidentally imported <code>android.R</code>, this gives an error with resources as well.

blocks|key|764479|text|当无法构建项目时，会发生这种情况，因为项目名称可能不足以构建项目。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|764480|您需要创建另一个没有任何不可接受符号的项目，并复制所有代码文件(.java、xml文件等)并将其粘贴到新创建的项目中。然后清除您的项目(项目->+clean)并选择build+automatically选项。|764481|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|$]]

That happens when the project cannot be build, because the project name may not be sufficient for building.

You need to create another project without any unacceptable symbols and copy all code files (.java, xml files, etc) and paste it to newly created project. Then clear your project (project -> clean) and select the build automatically option.

blocks|key|764607|text|这发生在我身上是因为一个错误的资源名称(一些音频文件在名称中有“-”)，我通过重命名该文件来修复它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|764608|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|$]]

This happened to me because of a bad resource name (some audio file had " - " in a name), I fixed it by renaming the file.

blocks|key|547831|text|这在我的例子中发生了，因为res/drawable-hdpi中的一个图像有一个大写字符，我把它变小了，然后它就起作用了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|547832|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|$]]

This happened in my case as a image that was present in res/drawable-hdpi had a capital character, I made it small then it worked.

blocks|key|764749|text|你绝对应该检查一下你的XML文件，因为这里的大多数人都在发帖。这是因为这个问题很可能是因为您的资源中的某些东西不正确，可能是由于调试。但是，如果不是这样，您可能需要检查包含任何大写字母的资源的文件夹。此外，您还希望确保使用罗马字母表正确地命名资源。这让我有点抓狂，因为我的很多文件夹和设置都是中文的。我将一些项目保存到Dropbox中名为麥思樂的安卓計劃的文件夹中的工作区中。我更改了文件夹的名称并解决了问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|764750|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|$]]

You should definitely check your XML files as most people here post. This is because this problem is most likely because of something in your resources not being right, possibly due to debugging. HOWEVER, if this is not the case you may want to check for folders with any resources that have any CAPITAL LETTERS. also you want to make sure you are using the roman alphabet to name resources properly. This made me scratch my head a little bit because a lot of my folders and settings are in Chinese. I saved some projects to a workspace in a folder in Dropbox named 麥思樂的安卓計劃. I changed the name of the folder and problem solved.

blocks|key|764819|text|我找到了解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|764820|检查是否有您在从外部复制文件时忘记在string.xml中定义的<string>+</string>。|offset|length|style|CODE|764821|entityMap^0|0|I|A|W|I|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@$D|L|E|M|F|G]|$D|N|E|O|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|P|8|@]|9|@]|A|$]]]|I|$]]

I found solution:

Check is there any <code>&lt;string&gt; &lt;/string&gt;</code> is that you forgot to define in <code>string.xml</code> while copying file from outside.

blocks|key|548035|text|如果您在创建Android项目时没有看到生成R.java文件，那么您可能错过了在Android+SDK+Manager中下载Android+SDK工具。在eclipse中，进入window+-->选择Android+SDK+Manager一旦Android+SDKManager窗口打开，检查Tools文件夹并安装。安装完成后，重新启动eclipse+IDE。构建你的项目，你可以看到在你的Android项目的gen文件夹下生成的R.java文件。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|548036|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 you do not see R.java file generation upon creating an Android project, then you probably have missed downloading Android SDK Tools in the Android SDK Manager.
In eclipse, go to Window-->select Android SDK Manager
Once the Android SDKManager window opens, check the Tools folder and install. Once the installation is completed, restart the eclipse IDE.
Build your project and you can see the R.java file generated under the gen folder of your Android project.

Every time in code that I have an R, I get an error R cannot be resolved to a variable.

The R.java file appears to be missing.

I have tried cleaning the project.

Missing R.java file even though project cleaned

Android

每次在代码中我有一个R，我得到一个错误R不能被解析为一个变量。R.java文件似乎已丢失。我试过清理这个项目。

问即使清除了项目，也缺少R.java文件
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问即使清除了项目，也缺少R.java文件
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