本文介绍了解决Eclipse开发环境中创建Android应用时遇到的“无法打开R.java文件”错误的方法。通过调整Eclipse中Java环境的构建路径设置，确保项目的源文件和输出文件夹配置正确。
You’ve just installed Eclipse , and attempted to create your first Android Application. When clicking create, you see an error similar to this: "Error: Unable to open class file R.java "
如果出现 “Error: Unable to open class file R.java No such file or directory”。
Solution:解决方法：
The “Build Path” for your Java environment is not setup correctly in Eclipse. To fix this, follow these steps:
1) Open the Preferences Window by clicking “Window -> Preferences”
2) Find the “Java” section and expand it
3) Select “Build Path ”
4) Change the value of Source and output folder from Folders to “Project”
5) Click Apply and then “OK ”
Your problem should be resolved!
勾选“Project” ，即可。
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