What can I do with R cannot be resolved problem?

If I make a new Android project in Ecplipse and I try, to open one of the samples from android SDK, I have got an error, l开发者_Python百科ook like this:

R cannot be resolved

What can I do, to be able, to run these files? I tried to delete import android.R; but nothing changed.

Thanks

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First thing you might try is "clean" your project (option in the menu). If it persists:

There should be an error that stops R from being generated. Check the "problems" tab (?) in eclipse to see what that problem is, and solve that. It could be missing libs, or various other stuff.

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You possibly got error in building resources. Possible fixes:

-refresh your project (F5)

-clean you project and refresh

-see "Console" tab, sometimes the problem is shown there

-reload the Android SDK

-restart the Eclipse IDE

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Check your XML-Layout files. The problem come here half a time.

If you are sure it is note your layout file, check in your java build path if the google librarys are well set. (Google APIs)

(sorry for my bad english)