我正在尝试将外部JAR添加到我的项目中，并收到此错误：
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UNEXPECTED TOP-LEVEL EXCEPTION:
java.lang.IllegalArgumentException: already added: Lorg/codehaus/jackson/Base64Variant;
[2011-08-24 16:35:19 - MyProjApp] Dx at com.android.dx.dex.file.ClassDefsSection.add(ClassDefsSection.java:123)
[2011-08-24 16:35:19 - MyProjApp] Dx at com.android.dx.dex.file.DexFile.add(DexFile.java:143)
[2011-08-24 16:35:19 - MyProjApp] Dx at com.android.dx.command.dexer.Main.processClass(Main.java:372)
[2011-08-24 16:35:19 - MyProjApp] Dx at com.android.dx.command.dexer.Main.processFileBytes(Main.java:346)
[2011-08-24 16:35:19 - MyProjApp] Dx at com.android.dx.command.dexer.Main.access$400(Main.java:59)
[2011-08-24 16:35:19 - MyProjApp] Dx at com.android.dx.command.dexer.Main$1.processFileBytes(Main.java:294)
[2011-08-24 16:35:19 - MyProjApp] Dx at com.android.dx.cf.direct.ClassPathOpener.processArchive(ClassPathOpener.java:244)
[2011-08-24 16:35:19 - MyProjApp] Dx at com.android.dx.cf.direct.ClassPathOpener.processOne(ClassPathOpener.java:130)
[2011-08-24 16:35:19 - MyProjApp] Dx at com.android.dx.cf.direct.ClassPathOpener.process(ClassPathOpener.java:108)
[2011-08-24 16:35:19 - MyProjApp] Dx at com.android.dx.command.dexer.Main.processOne(Main.java:313)
[2011-08-24 16:35:19 - MyProjApp] Dx at com.android.dx.command.dexer.Main.processAllFiles(Main.java:233)
[2011-08-24 16:35:19 - MyProjApp] Dx at com.android.dx.command.dexer.Main.run(Main.java:185)
[2011-08-24 16:35:19 - MyProjApp] Dx at sun.reflect.GeneratedMethodAccessor8.invoke(Unknown Source)
[2011-08-24 16:35:19 - MyProjApp] Dx at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
[2011-08-24 16:35:19 - MyProjApp] Dx at java.lang.reflect.Method.invoke(Unknown Source)
[2011-08-24 16:35:19 - MyProjApp] Dx at com.android.ide.eclipse.adt.internal.build.DexWrapper.run(DexWrapper.java:179)
[2011-08-24 16:35:19 - MyProjApp] Dx at com.android.ide.eclipse.adt.internal.build.BuildHelper.executeDx(BuildHelper.java:652)
[2011-08-24 16:35:19 - MyProjApp] Dx at com.android.ide.eclipse.adt.internal.build.builders.PostCompilerBuilder.build(PostCompilerBuilder.java:510)
[2011-08-24 16:35:19 - MyProjApp] Dx at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:629)
[2011-08-24 16:35:19 - MyProjApp] Dx at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
[2011-08-24 16:35:19 - MyProjApp] Dx at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:172)
[2011-08-24 16:35:19 - MyProjApp] Dx at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:203)
[2011-08-24 16:35:19 - MyProjApp] Dx at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:255)
[2011-08-24 16:35:19 - MyProjApp] Dx at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
[2011-08-24 16:35:19 - MyProjApp] Dx at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:258)
[2011-08-24 16:35:19 - MyProjApp] Dx at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:311)
[2011-08-24 16:35:19 - MyProjApp] Dx at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:343)
[2011-08-24 16:35:19 - MyProjApp] Dx at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:144)
[2011-08-24 16:35:19 - MyProjApp] Dx at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:242)
[2011-08-24 16:35:19 - MyProjApp] Dx at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
[2011-08-24 16:35:19 - MyProjApp] Dx 1 error; aborting
[2011-08-24 16:35:19 - MyProjApp] **Conversion to Dalvik format failed with error 1**
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我知道jar和我添加的图书馆项目（Open-Feint库）存在冲突。
我的问题是，我能做些什么来解决这个问题吗？
答案 0 :(得分：3)
我在OpenFeint库中遇到了同样的问题，我想出来了。
如果您还在
中包含GameFeed项目项目＆gt;属性＆gt; Android＆gt;文库
部分，您可能会将OpenFeint API源包括两次，一次在OpenFeint库中，一次在GameFeed项目中作为依赖库。
我必须从GameFeed项目中删除OpenFeint API源链接，然后一切正常。
底线是某种程度上你有两次在你的项目中内置了一些源代码。
答案 1 :(得分：0)
一个不太好的解决方案是检查双类文件是否是完全相同的版本，如果是，请从其中一个罐子中删除它们... 这是一个解决方案，但不是一个非常安全的解决方案......只有在你必须的时候才这样做。