error R.java No such file or directory found

My project shows error in r.java.It was working fine before,all of sudden it says R.java is not found.When I tried to delete gen,gen file is generated automatically in which R.java showed error,

I tried cleaning my project,build path,deleted debug.keys开发者_如何学Pythontore.But,of no use.

Could anyone help in resolving this issue.I am able to build new project,its all fine.The problem is only with one project

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I have somehow managed to fix it, but I don't know exactly what did it. Here are things I did.

• Deleted eclipse directory and reinstalled it and ADT.
• Deleted my original project that was the first to have the problem.'
• Created a new project with my original's project name.
• Manually copied all my class and res files into the new project and refreshed it.
• Pasted the text of the old manifest into the new manifest.

I did all this, because simply importing the original project again didn't solve anything.

After the above changes Your Project will be Fine.

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I have faced same problem. simply i delete my r.java file and restart eclipse then this problem is solved.