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运行alipay支付，结果一直报这个错，最终，在stackoverflow中找到了答案，alipay_lib需要以lib项目引入，而不是把jar引入。都怪没好好看文档。。。

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NoClassDeffoundError:com.alipay.android.app.sdk.R$String 错误

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Referring library project .. gives NoClassDeffoundError for R files

http://stackoverflow.com/questions/11407190/referring-library-project-gives-noclassdeffounderror-for-r-files

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You're probably not importing it the right way. There are two ways of importing android code into a project

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Jar file: Should not have any kind of resource, as of right know you will not be allowed to access it.

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Library project: You import the project into the workspace as a standalone app, and in the project that needs the library, reference it at Properties->Android->Library->Add.

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Jar files are just zipped code. You can copy&paste into lib, and add them at the BUILD_PATH. But library projects are reference. Is not gonna work if you just copy&paste the project into the libs folder, as you said.

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It seems you're mixing both.

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