将Gradle项目导入Android项目

Question

我正在开发一个Android项目，我想导入另一个用gradle开发的现有项目。所以，我已经成功地在Eclipse中集成了gradle项目。我已经导入了gradle项目，我可以从gradle项目中看到并实例化类，但是当我启动android项目时，它会通过控制台抛出下一个日志：

 [2014-10-06 09:10:42 - Pdf2jpg-V3] Dx 
 UNEXPECTED TOP-LEVEL EXCEPTION:
com.android.dx.cf.iface.ParseException: bad class file magic (cafebabe) or version (0034.0000)
at com.android.dx.cf.direct.DirectClassFile.parse0(DirectClassFile.java:472)
at com.android.dx.cf.direct.DirectClassFile.parse(DirectClassFile.java:406)
at com.android.dx.cf.direct.DirectClassFile.parseToInterfacesIfNecessary(DirectClassFile.java:388)
at com.android.dx.cf.direct.DirectClassFile.getMagic(DirectClassFile.java:251)
at com.android.dx.command.dexer.Main.processClass(Main.java:665)
at com.android.dx.command.dexer.Main.processFileBytes(Main.java:634)
at com.android.dx.command.dexer.Main.access$600(Main.java:78)
at com.android.dx.command.dexer.Main$1.processFileBytes(Main.java:572)
at com.android.dx.cf.direct.ClassPathOpener.processArchive(ClassPathOpener.java:284)
at com.android.dx.cf.direct.ClassPathOpener.processOne(ClassPathOpener.java:166)
at com.android.dx.cf.direct.ClassPathOpener.process(ClassPathOpener.java:144)
at com.android.dx.command.dexer.Main.processOne(Main.java:596)
at com.android.dx.command.dexer.Main.processAllFiles(Main.java:498)
at com.android.dx.command.dexer.Main.runMonoDex(Main.java:264)
at com.android.dx.command.dexer.Main.run(Main.java:230)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.android.ide.eclipse.adt.internal.build.DexWrapper.run(DexWrapper.java:188)
at com.android.ide.eclipse.adt.internal.build.BuildHelper.executeDx(BuildHelper.java:786)
at com.android.ide.eclipse.adt.internal.build.builders.PostCompilerBuilder.build(PostCompilerBuilder.java:597)
at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:734)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:206)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:328)
at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:403)
at org.eclipse.core.internal.resources.Project$1.run(Project.java:618)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2313)
at org.eclipse.core.internal.resources.Project.internalBuild(Project.java:597)
at org.eclipse.core.internal.resources.Project.build(Project.java:124)
at com.android.ide.eclipse.adt.internal.project.ProjectHelper.doFullIncrementalDebugBuild(ProjectHelper.java:1143)
at com.android.ide.eclipse.adt.internal.launch.LaunchConfigDelegate.launch(LaunchConfigDelegate.java:155)
at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:883)
at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:739)
at org.eclipse.debug.internal.ui.DebugUIPlugin.buildAndLaunch(DebugUIPlugin.java:1039)
at org.eclipse.debug.internal.ui.DebugUIPlugin$8.run(DebugUIPlugin.java:1256)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
...while parsing simple/escp/Template.class

  [2014-10-06 09:10:43 - Pdf2jpg-V3] Dx 1 error; aborting
  [2014-10-06 09:10:43 - Pdf2jpg-V3] Conversion to Dalvik format failed with error 1

要将gradle项目导入我的android项目，我尝试了两种方式： 1-从gradle项目导出JAR并导入为外部jar并使用构建路径进行检查 2-将整个gradle项目添加到android项目的构建路径中。

两者都抛出相同的异常。

Answer 1

最后问题是Gradle项目（1.8）中的合规级别，因此，我将项目更新为1.6（就像我的android项目），并且还更新了仅在1.8中工作的实例，现在在1.6中工作。

我现在的问题是，gradle项目中包含的jar引用似乎不起作用，但事实上包括gradle引用如下：

因此，执行会抛出未找到类的异常：

   java.lang.NoClassDefFoundError: javax.json.JsonObject

...虽然包含了javax.json，但任何想法都是??