android library projects cannot be launched

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在Eclipse中运行应用一个刚导入进来的工程程序出现对话框“android library projects cannot be launched”所示

把is library 前的对勾去掉，如下图2

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引用下http://jingyan.baidu.com/album/636f38bb3df187d6b9461048.html?picindex=3

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Hello World Android App, Error: workspace\appcompat_v7\res\values-v21\styles_base.xml No resource found that matches the given name

1.不多说，直接上图，如图1（由此可见，你的API应该勾选5.0.1的）

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2.the problem is that the new project created contains into the /libs folder, the library "android-support-v4.jar" too!, just delete this .jar from your new project ( that is already contained into the appcompat_v7 library)

don´t forget to clean and build your project

意思是有了appcompat_v7（appcompat_v7包含android-support-v4.jar），就把android-support-v4.jar删掉，

说的有点乱，但是这些都是自己遇到的解决方法！！

来自：http://stackoverflow.com/questions/26518144/hello-world-android-app-error-workspace-appcompat-v7-res-values-v21-styles-bas

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