在使用蚂蚁构建android应用程序时产生NullPointerException

使用蚂蚁构建android应用程序时，我得到以下异常。无法弄清楚为什么会抛出这些异常！在使用蚂蚁构建android应用程序时产生NullPointerException

Execute:Java13CommandLauncher: Executing 'D:\Android-2.0\android-sdk-windows\platforms\android-1.5\tools\aapt.exe' with arguments: 
'package' 
'-f' 
'-M' 
'E:\manish_test\timetrack\client\static\android\AndroidManifest.xml' 
'-S' 
'E:\manish_test\timetrack\client\static\android\res' 
'-A' 
'E:\manish_test\timetrack\client\static\android\assets' 
'-I' 
'D:\Android-2.0\android-sdk-windows\platforms\android-1.5\android.jar' 
'-F' 
'C:\CLIENT_BUILDS\QA\3.0.9\Android\11-Feb-2010_b1\XoraTimeTrack.ap_'

周围可执行文件和参数的'字符是不是命令的一部分。

 [null]  (skipping index file 'E:\manish_test\timetrack\client\static\android\res\drawable\Thumbs.db') 
Class org.apache.tools.ant.Project loaded from parent loader (parentFirst) 
Finding class com.android.sdklib.internal.project.ProjectProperties$PropertyType 
Loaded from D:\Android-2.0\android-sdk-windows\tools\lib\sdklib.jar com/android/sdklib/internal/project/ProjectProperties$PropertyType.class 
Class java.lang.Enum loaded from parent loader (parentFirst) 
Class com.android.sdklib.internal.project.ProjectProperties$PropertyType loaded from ant loader (parentFirst) 
Finding class com.android.sdklib.internal.project.ProjectProperties 
Loaded from D:\Android-2.0\android-sdk-windows\tools\lib\sdklib.jar com/android/sdklib/internal/project/ProjectProperties.class 
Class com.android.sdklib.internal.project.ProjectProperties loaded from ant loader (parentFirst) 
Class java.util.Map loaded from parent loader (parentFirst) 
Class java.io.OutputStream loaded from parent loader (parentFirst) 
Class java.io.FileOutputStream loaded from parent loader (parentFirst) 
Class java.lang.Throwable loaded from parent loader (parentFirst) 
Class java.lang.AssertionError loaded from parent loader (parentFirst) 
Class java.lang.Class loaded from parent loader (parentFirst) 
Class java.util.HashMap loaded from parent loader (parentFirst) 
Finding class com.android.sdklib.internal.project.ApkConfigurationHelper 
Loaded from D:\Android-2.0\android-sdk-windows\tools\lib\sdklib.jar com/android/sdklib/internal/project/ApkConfigurationHelper.class 
Class com.android.sdklib.internal.project.ApkConfigurationHelper loaded from ant loader (parentFirst) 
Finding class com.android.sdklib.internal.project.ApkSettings 
Loaded from D:\Android-2.0\android-sdk-windows\tools\lib\sdklib.jar com/android/sdklib/internal/project/ApkSettings.class 
Class com.android.sdklib.internal.project.ApkSettings loaded from ant loader (parentFirst) 
    [antcall] Exiting E:\manish_test\timetrack\build\build-Android-1.0.xml. 

BUILD FAILED 
E:\manish_test\timetrack\build\build-Android-1.0.xml:371: The following error occurred while executing this line: 
E:\manish_test\timetrack\build\build-Android-1.0.xml:302: java.lang.NullPointerException 
    at org.apache.tools.ant.ProjectHelper.addLocationToBuildException(ProjectHelper.java:508) 
    at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:418) 
    at org.apache.tools.ant.taskdefs.CallTarget.execute(CallTarget.java:105) 
    at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288) 
    at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
    at java.lang.reflect.Method.invoke(Method.java:597) 
    at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106) 
    at org.apache.tools.ant.Task.perform(Task.java:348) 
    at org.apache.tools.ant.Target.execute(Target.java:357) 
    at org.apache.tools.ant.Target.performTasks(Target.java:385) 
    at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337) 
    at org.apache.tools.ant.Project.executeTarget(Project.java:1306) 
    at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41) 
    at org.apache.tools.ant.Project.executeTargets(Project.java:1189) 
    at org.apache.tools.ant.Main.runBuild(Main.java:758) 
    at org.apache.tools.ant.Main.startAnt(Main.java:217) 
    at org.apache.tools.ant.launch.Launcher.run(Launcher.java:257) 
    at org.apache.tools.ant.launch.Launcher.main(Launcher.java:104) 
Caused by: E:\manish_test\timetrack\build\build-Android-1.0.xml:302: java.lang.NullPointerException 
    at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:116) 
    at org.apache.tools.ant.Task.perform(Task.java:348) 
    at org.apache.tools.ant.Target.execute(Target.java:357) 
    at org.apache.tools.ant.Target.performTasks(Target.java:385) 
    at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337) 
    at org.apache.tools.ant.helper.SingleCheckExecutor.executeTargets(SingleCheckExecutor.java:38) 
    at org.apache.tools.ant.Project.executeTargets(Project.java:1189) 
    at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:416) 
    ... 17 more 
Caused by: java.lang.NullPointerException 
    at com.android.sdklib.internal.project.ApkConfigurationHelper.getSettings(ApkConfigurationHelper.java:31) 
    at com.android.ant.AaptExecLoopTask.execute(AaptExecLoopTask.java:137) 
    at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288) 
    at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
    at java.lang.reflect.Method.invoke(Method.java:597) 
    at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106) 
    ... 24 more 
--- Nested Exception --- 
E:\manish_test\timetrack\build\build-Android-1.0.xml:302: java.lang.NullPointerException 
    at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:116) 
    at org.apache.tools.ant.Task.perform(Task.java:348) 
    at org.apache.tools.ant.Target.execute(Target.java:357) 
    at org.apache.tools.ant.Target.performTasks(Target.java:385) 
    at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337) 
    at org.apache.tools.ant.helper.SingleCheckExecutor.executeTargets(SingleCheckExecutor.java:38) 
    at org.apache.tools.ant.Project.executeTargets(Project.java:1189) 
    at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:416) 
    at org.apache.tools.ant.taskdefs.CallTarget.execute(CallTarget.java:105) 
    at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288) 
    at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
    at java.lang.reflect.Method.invoke(Method.java:597) 
    at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106) 
    at org.apache.tools.ant.Task.perform(Task.java:348) 
    at org.apache.tools.ant.Target.execute(Target.java:357) 
    at org.apache.tools.ant.Target.performTasks(Target.java:385) 
    at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337) 
    at org.apache.tools.ant.Project.executeTarget(Project.java:1306) 
    at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41) 
    at org.apache.tools.ant.Project.executeTargets(Project.java:1189) 
    at org.apache.tools.ant.Main.runBuild(Main.java:758) 
    at org.apache.tools.ant.Main.startAnt(Main.java:217) 
    at org.apache.tools.ant.launch.Launcher.run(Launcher.java:257) 
    at org.apache.tools.ant.launch.Launcher.main(Launcher.java:104) 
Caused by: java.lang.NullPointerException 
    at com.android.sdklib.internal.project.ApkConfigurationHelper.getSettings(ApkConfigurationHelper.java:31) 
    at com.android.ant.AaptExecLoopTask.execute(AaptExecLoopTask.java:137) 
    at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288) 
    at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
    at java.lang.reflect.Method.invoke(Method.java:597) 
    at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106) 
    ... 24 more 
--- Nested Exception --- 
java.lang.NullPointerException 
    at com.android.sdklib.internal.project.ApkConfigurationHelper.getSettings(ApkConfigurationHelper.java:31) 
    at com.android.ant.AaptExecLoopTask.execute(AaptExecLoopTask.java:137) 
    at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288) 
    at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
    at java.lang.reflect.Method.invoke(Method.java:597) 
    at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106) 
    at org.apache.tools.ant.Task.perform(Task.java:348) 
    at org.apache.tools.ant.Target.execute(Target.java:357) 
    at org.apache.tools.ant.Target.performTasks(Target.java:385) 
    at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337) 
    at org.apache.tools.ant.helper.SingleCheckExecutor.executeTargets(SingleCheckExecutor.java:38) 
    at org.apache.tools.ant.Project.executeTargets(Project.java:1189) 
    at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:416) 
    at org.apache.tools.ant.taskdefs.CallTarget.execute(CallTarget.java:105) 
    at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288) 
    at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
    at java.lang.reflect.Method.invoke(Method.java:597) 
    at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106) 
    at org.apache.tools.ant.Task.perform(Task.java:348) 
    at org.apache.tools.ant.Target.execute(Target.java:357) 
    at org.apache.tools.ant.Target.performTasks(Target.java:385) 
    at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337) 
    at org.apache.tools.ant.Project.executeTarget(Project.java:1306) 
    at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41) 
    at org.apache.tools.ant.Project.executeTargets(Project.java:1189) 
    at org.apache.tools.ant.Main.runBuild(Main.java:758) 
    at org.apache.tools.ant.Main.startAnt(Main.java:217) 
    at org.apache.tools.ant.launch.Launcher.run(Launcher.java:257) 
    at org.apache.tools.ant.launch.Launcher.main(Launcher.java:104)

来源

2010-02-11 Manish

发现解决方案异常是由于属性文件名和位置的硬编码而引发的。 ApkConfigurationHelper需要ant项目基础目录中的default.properties文件，并且应在此文件中设置属性split.density。它现在像一个魅力工作。

感谢所有为你所有的帮助..

- 马尼什

来源

2010-02-11 20:09:00 Manish

最后：

Caused by: java.lang.NullPointerException 
    at com.android.sdklib.internal.project.ApkConfigurationHelper.getSettings(ApkConfigurationHelper.java:31)

是这里最重要的一个。
你需要检查ApkConfigurationHelper源代码，看看它为什么会在这里抛出一个NPE。

来源

2010-02-11 08:46:58 VonC

第31行是这个布尔splitByDensity = Boolean.parseBoolean（properties.getProperty（ ProjectProperties.PROPERTY_SPLIT_BY_DENSITY））; 我很无知在哪里设置此属性。 – Manish 2010-02-11 09:05:08

尝试设置在属性这个属性文件，但仍然得到同样的错误 – Manish 2010-02-11 09:52:50

@Manish：也许'properties'实际上是空...意为'PROPERTY_SPLIT_BY_DENSITY'是不是一个问题，但它的容器（'properties'）未能正确初始化。 – VonC 2010-02-11 12:27:40

在使用蚂蚁构建android应用程序时产生NullPointerException

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