Unable to open/import existing project into Eclipse

I'm a beginner at Android and there's an existing Android project I'd like to import into Eclipse. From googling I found I should do this via File/Import/Existing project, which I did (there is a .project file in the root directory of the project I wish to open).

However after doing this Eclipse displayed an error message saying:

"ERROR: Unable to open class file C:\Users\ ..... \R.java: No such file or directory"

However the file R.java does exist at the location Eclipse 开发者_StackOverflow中文版is displaying in the error message. Why does it think the file isn't there when it is? How can I proceed to open the project?

TIA

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I was able to import the project but after I cleaned the project I wasn't able to import the same project back to the same workspace. I think some files got deleted from the cleaning process.

I ended up changing the workspace directory and was able to get it working again.

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Try to Clean your project and then Rebuild it. You could also try to manually delete the R.java file and Rebuild your project.