android - R cannot be resolved to a variable, but R.java is generated -

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i've created android application project , getting error "r cannot resolved variable." i've checked directory, , r.java present, xml files don't seem have errors, names don't have capital letters, spaces, or special characters, deleted "import java.r" line, cleaned, , rebuilt project, i've still been getting error. according sdk manager, android sdk tools date. there i've missed?

fix errors first clean , run.check api right click project> properties > android >check api 17


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