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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