blocks|key|3110736|text|你需要读一下这个--+Dealing+with+dependencies+in+Android+projects。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3110737|此链接也很有用-+ClassDefNotFoundError+with+ADT+17|3110738|基本上，创建一个名为libs的文件夹，并将所有jar文件放入其中。最近的更新将自动为您处理其余部分。您不再需要编辑路径。|style|CODE|3110739|entityMap|0|LINK|mutability|MUTABLE|url|http://tools.android.com/recent/dealingwithdependenciesinandroidprojects|1|http://android.foxykeep.com/dev/how-to-fix-the-classdefnotfounderror-with-adt-17^0|B|19|0|0|9|X|1|0|A|4|N|3|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@$A|U|B|V|1|W]]|C|$]]|$1|D|3|E|5|6|7|X|8|@]|9|@$A|Y|B|Z|1|10]]|C|$]]|$1|F|3|G|5|6|7|11|8|@$A|12|B|13|H|I]|$A|14|B|15|H|I]]|9|@]|C|$]]|$1|J|3|-4|5|6|7|16|8|@]|9|@]|C|$]]]|K|$L|$5|M|N|O|C|$P|Q]]|R|$5|M|N|O|C|$P|S]]]]

You need to read this - <a href="http://tools.android.com/recent/dealingwithdependenciesinandroidprojects">Dealing with dependencies in Android projects</a>.

This link is also useful - <a href="http://android.foxykeep.com/dev/how-to-fix-the-classdefnotfounderror-with-adt-17">ClassDefNotFoundError with ADT 17</a>

Basically, create a folder called <code>libs</code> and place all of your <code>jar</code> files inside. The recent update will automatically take care of the rest for you. You don't need to edit your path anymore.

blocks|key|3110894|text|Android目前还不支持Java1.7。兼容级别为1.7的Jars不能在Android应用程序中使用。在导出jar文件之前，使用遵从性级别5.0或6.0重新构建Java项目。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3110895|我通过谷歌找到了这篇文章，上面的答案并没有解决我的问题。希望我说的话能对别人有所帮助。|3110896|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Android does not support Java1.7 up to now. Jars built with compliance level 1.7 cannot be used in Android Applications. Rebuild your Java project with compliance level 5.0 or 6.0 before exporting the jar file.

I found this post via google and answers above didn't solve my problem. Hope what I say will be helpful to others.

blocks|key|2896881|text|如果您在升级到EclipseAdt22后看到NoClassDefFoundError，请在中尝试：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|BOLD|entityRanges|data|2896882|2896883|转到项目属性和Java+Build+Path→Order→Export选项卡。|unordered-list-item|2896884|检查Android私有库选项。|2896885|2896886|​|2896887|📷|atomic|2896888|2896889|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/bb3186d5d9757c3a8409ef3ada32e4f9.png|imageAlt^0|M|K|19|4|0|0|0|13|0|0|F|0|0|0|1|0|0|1|0|1|0|0|0|1|0^^$0|@$1|2|3|4|5|6|7|12|8|@$9|13|A|14|B|C]|$9|15|A|16|B|D]]|E|@]|F|$]]|$1|G|3|-4|5|6|7|17|8|@]|E|@]|F|$]]|$1|H|3|I|5|J|7|18|8|@$9|19|A|1A|B|D]]|E|@]|F|$]]|$1|K|3|L|5|J|7|1B|8|@$9|1C|A|1D|B|D]]|E|@]|F|$]]|$1|M|3|-4|5|6|7|1E|8|@]|E|@]|F|$]]|$1|N|3|O|5|6|7|1F|8|@$9|1G|A|1H|B|D]]|E|@]|F|$]]|$1|P|3|Q|5|R|7|1I|8|@$9|1J|A|1K|B|D]]|E|@$9|1L|A|1M|1|1N]]|F|$]]|$1|S|3|O|5|6|7|1O|8|@$9|1P|A|1Q|B|D]]|E|@]|F|$]]|$1|T|3|-4|5|6|7|1R|8|@]|E|@]|F|$]]]|U|$V|$5|W|X|Y|F|$Z|10|11|-4]]]]

If you see <code>NoClassDefFoundError</code> after upgrading to ADT 22, try this in Eclipse:

<ul>
<li>Go to Project Properties → Java Build Path → Order and Export tab.</li>
<li>Check the Android Private Libraries option.</li>
</ul>

<img src="https://i.stack.imgur.com/Sl8qD.png" alt="Android Private Libraries option">

blocks|key|231373|text|这也是对其他已经更新到具有许多依赖项的r17的人的警告。我在构建路径上有另一个参考项目，在遵循了互联网上关于这个r17问题的所有说明后，它仍然不起作用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|231374|一个小时后，我发现我引用的项目使用的外部Jar版本比我的主项目使用的旧版本。当尝试编译主项目时，Eclipse会因为这个jar版本差异而放弃，并且我从未注意到控制台中的警告消息。|231375|解决方案是将较新版本的外部jar文件复制到引用项目的libs目录中。|231376|哇--如此高效的杀手……|231377|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

Also a warning to others who have updated to r17 with many dependencies. I had a another referenced project on my build path and it still did not work after following ALL the directions on this r17 issue on the internet.

Found out after an hour that my referenced project used an older version of an external Jar than my main project did. When trying to compile the main project, Eclipse would give up due to this jar version difference and I never noticed the warning message in Console.

Solution was to copy the newer version external jar file to the referenced project's libs directory.

Wow - such a productivity killer.....

blocks|key|231365|text|我今天也遇到了这个错误，因为更新到了Android+SDK，r17。@aneal指出的链接没有讨论的是如何处理外部运行时库(比如在它们自己的标题下导入的库-而不是导入的用户库)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|231366|解决此问题的最简单方法是更改构建路径中的构建顺序。只需右键单击您的项目并选择Properties。在这里，选择Java+Build+Path。在屏幕顶部，选择tab键顺序，然后导出GoogleAdMobAdsSdk-4.3.1.jar并将其移动到Android+X上方(用您正在使用的版本替换x)。接下来，清理您的项目并运行它。你应该可以走了！|offset|length|style|BOLD|231367|entityMap^0|0|2I|R|3F|9|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@$D|L|E|M|F|G]|$D|N|E|O|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|P|8|@]|9|@]|A|$]]]|I|$]]

I ran into this error today too, because of updating to the Android SDK, r17. What the links that @aneal pointed out do not discuss is how to handle external runtime libraries (such as those imported under their own heading - not an imported user library). 

The easiest way to solve this problem is to change the build order in the build path. Simply right click on your project and select Properties. From here, select Java Build Path. At the top of the display, choose the tab order and export and move GoogleAdMobAdsSdk-4.3.1.jar above Android X (replacing x with the version you are using). Next, clean your project and run it. You should be good to go!

blocks|key|3110906|text|我解决这个问题的方法是:右键单击项目并选择build+path。在出现的选项中选择configure+build+path。之后，查看您的库是否在libraries文件夹中，然后选择order+and+export选项卡，并在那里选择所有jar文件。然后选择ok并运行您的项目。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3110907|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

The way I solved it was by : Right clicking on the project and selecting build path. Select configure build path in the selections that appear. After that see if your libraries are there in the libraries folder and then select the order and export tab and over there select all your jar files. Then select ok and run your project.

blocks|key|235257|text|如果您正在使用Eclipse+with+Maven+IDE+(m2e)，请转到"Java+Build+Path“，然后转到"Order+and+Export”，最后选中"Maven+Dependencies“项并将其拉到列表的底部。您应该对同一工作区中的项目引用执行相同的操作。每次我在一台新计算机上设置项目时，都会发生这种情况。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|235258|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

If you're using Eclipse with Maven IDE (m2e) go to "Java Build Path" then "Order and Export" and finally check the item "Maven Dependencies" and pull it down to the BOTTOM of the list. You should do the same with project references in the same workspace.
Every time I setup the project in a new computer that happens.

I have come across a strange error. I have an Android project that uses external libraries, in particular:

<ul>
<li>android-support-v4.jar (for Fragment support in Android 1.6)</li>
<li>GoogleAdMobAdsSdk-4.3.1.jar (for ads)</li>
</ul>

The project ran fine until I updated some aspects of the plugin (can't recall the specifics as I did not pay too much attention to it) and after that, whenever I try to use any class from the above .jar files (or any of its subclasses, even ones defined by me), I would get a java.lang.NoClassDefFoundError. I could not find the answer after much searching, so I am really stumped.

I believe this problem is related to how my IDE is set up and it has little to do with actual code, so I will not post any unless if it's absolutely necessary.

Android Eclipse NoClassDefFoundError for external .jar files

Android

Eclipse

Java

我遇到了一个奇怪的错误。我有一个使用外部库的Android项目，特别是：android-support-v4.jar (用于安卓系统中的片段支持) 1.6)GoogleAdMobAdsSdk-4.3.1.jar (用于广告)这个项目运行得很好，直到我更新了插件的某些方面(我记不起细节了，因为我没有太注意它)，在那之后，每当我试图使用上述.jar文件中的任何类(或者它的任何子类，甚至是我定义的那些)

问用于外部.jar文件的Android Eclipse NoClassDefFoundError
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