eclipse编程中，包代码提示button1 cannot be resolved，怎样在xml去说明？ eclipse中导包出现这种情况改如何处理？
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2 ，右键工程 - properties -java build path ，检查jar包和其他配置是否勾选
3 ，project - lean 将工程clean一下
4 ，关闭工程 ， 再打开
5 ，如果是导入的其他源码工程 ， 可以 new --android project --create project from existing sample
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