如何获得Android项目和标准的Java项目打好？

Question

我现在可以让我们的Android项目与我们的非Android项目交谈。但仍然有一个问题：

• 我试图让Android类调用非Android的Hello World类。

• 我试着在单独的Eclipse工作区中编译我们的非Android Hello World类。然后我将它打包成一个罐子。我将该jar导入到我们的Android Hello World类中。

然后我在非Android Hello World类中调用了其中一个方法。

当我将Android Hello World类作为Android应用程序运行时，发生以下运行时错误。下面是Android的调试日志：

08-11 09:07:56.764: ERROR/AndroidRuntime(333): FATAL EXCEPTION: main 
08-11 09:07:56.764: ERROR/AndroidRuntime(333): java.lang.ExceptionInInitializerError 
08-11 09:07:56.764: ERROR/AndroidRuntime(333): at com.hello2.hello2.onCreate(hello2.java:27) 
08-11 09:07:56.764: ERROR/AndroidRuntime(333): at android.app.Instrumentation.callActivityOnCreate(I nstrumentation.java:1047) 
08-11 09:07:56.764: ERROR/AndroidRuntime(333): at android.app.ActivityThread.performLaunchActivity(A ctivityThread.java:2627) 
08-11 09:07:56.764: ERROR/AndroidRuntime(333): at android.app.ActivityThread.handleLaunchActivity(Ac tivityThread.java:2679) 
08-11 09:07:56.764: ERROR/AndroidRuntime(333): at android.app.ActivityThread.access$2300(ActivityThr ead.java:125) 
08-11 09:07:56.764: ERROR/AndroidRuntime(333): at android.app.ActivityThread$H.handleMessage(Activit yThread.java:2033) 
08-11 09:07:56.764: ERROR/AndroidRuntime(333): at android.os.Handler.dispatchMessage(Handler.java:99) 
08-11 09:07:56.764: ERROR/AndroidRuntime(333): at android.os.Looper.loop(Looper.java:123) 
08-11 09:07:56.764: ERROR/AndroidRuntime(333): at android.app.ActivityThread.main(ActivityThread.jav a:4627) 
08-11 09:07:56.764: ERROR/AndroidRuntime(333): at java.lang.reflect.Method.invokeNative(Native Method) 
08-11 09:07:56.764: ERROR/AndroidRuntime(333): at java.lang.reflect.Method.invoke(Method.java:521) 
08-11 09:07:56.764: ERROR/AndroidRuntime(333): at com.android.internal.os.ZygoteInit$MethodAndArgsCa ller.run(ZygoteInit.java:868) 
08-11 09:07:56.764: ERROR/AndroidRuntime(333): at com.android.internal.os.ZygoteInit.main(ZygoteInit .java:626) 
08-11 09:07:56.764: ERROR/AndroidRuntime(333): at dalvik.system.NativeStart.main(Native Method) 
08-11 09:07:56.764: ERROR/AndroidRuntime(333): Caused by: java.lang.ExceptionInInitializerError 
08-11 09:07:56.764: ERROR/AndroidRuntime(333): at org.apache.log4j.Logger.getLogger(Logger.java:118) 
08-11 09:07:56.764: ERROR/AndroidRuntime(333): at helloArtifactJarTest.seconddirectory.TestJar.Hello PleasePleasePrint.<clinit>(HelloPleasePleasePrint. java:7) 
08-11 09:07:56.764: ERROR/AndroidRuntime(333): ... 14 more 
08-11 09:07:56.764: ERROR/AndroidRuntime(333): Caused by: java.lang.VerifyError: org.apache.log4j.config.PropertySetter 
08-11 09:07:56.764: ERROR/AndroidRuntime(333): at org.apache.log4j.PropertyConfigurator.parseAppende r(PropertyConfigurator.java:684) 
08-11 09:07:56.764: ERROR/AndroidRuntime(333): at org.apache.log4j.PropertyConfigurator.parseCategor y(PropertyConfigurator.java:647) 
08-11 09:07:56.764: ERROR/AndroidRuntime(333): at org.apache.log4j.PropertyConfigurator.configureRoo tCategory(PropertyConfigurator.java:544) 
08-11 09:07:56.764: ERROR/AndroidRuntime(333): at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:440) 
08-11 09:07:56.764: ERROR/AndroidRuntime(333): at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:476) 
08-11 09:07:56.764: ERROR/AndroidRuntime(333): at org.apache.log4j.helpers.OptionConverter.selectAnd Configure(OptionConverter.java:471) 
08-11 09:07:56.764: ERROR/AndroidRuntime(333): at org.apache.log4j.LogManager.<clinit>(LogManager.ja va:125) 
08-11 09:07:56.764: ERROR/AndroidRuntime(333): ... 16 more 

看来，我可以用它正确地使用log4j的记录器运行HelloPleasePleasePrint作为一个Java应用罚款。但是当我们尝试从hello2 Android类的HelloPleasePleasePrint中调用方法时，它会抱怨log4j。

任何帮助或援助将不胜感激。

Answer 1

要摆脱log4j错误，您可以尝试使用android-logging-log4j。见log4j support in android。未使用类路径中的log4j.properties或log4j.xml文件配置log4j系统非常重要。