我要，我还没有找到答案的问题，对不起，如果反复 我升级到SDK和ADT 17，然后每次都因为我打开了通向一个项目，例如，广告AdMob的谷歌给我的错误：

I have a question to which I have not found an answer, sorry if repeated I upgraded to sdk and ADT 17 and since then every time I open a project leading, for example, advertising admob google gives me error:

找不到类的com.google.ads.AdView......

Could not find class 'com.google.ads.AdView' ...

这令我在包括库（罐）所有项目

This strikes me in all projects that include libraries (jars)

我在此SDK读到已经改变了一些事情，但我的英语不是很好（使用谷歌翻译），我知道我做错了。

I have read about in this SDK has changed something about it, but my English is not very good (use google translator) and I understand that I am doing wrong.

我AP preciate任何帮助。

I appreciate any help.

最好的问候

推荐答案

报价XAV 的：

如果您在更新至R17后有ClassDefNotFoundError，请务必阅读以下链接：

If you have ClassDefNotFoundError after updating to r17, make sure to read the following links:   

http://android.foxykeep.com/dev/how-to-fix-the-classdefnotfounderror-with-adt-17显示了如何用固定的项目应该是什么样子漂亮的照片的问题。

http://android.foxykeep.com/dev/how-to-fix-the-classdefnotfounderror-with-adt-17 shows how to fix the problem with nice pictures of what the project should look like.

http://tools.android.com/recent/dealingwithdependenciesinandroidprojects   （这是从博客文章，并从发行说明链接）详细解释了新的依赖系统是如何工作的。

http://tools.android.com/recent/dealingwithdependenciesinandroidprojects (this was linked from the blog post and from the release notes) explains in detail how the new dependency system works.