Eclipse + Android + JUnit测试引用android.os class = NoClassDefFoundError [英] Eclipse + Android + JUnit test references android.os class = NoClassDefFoundError

问题描述

我有一个自定义的定时器来扩展android.os.CountDownTimer。我在测试项目（标准Android / Eclipse项目配置）中测试自定义Timer。当我运行这个测试，我得到：

java.lang.NoClassDefFoundError：android / os / CountDownTimer

  ;在java.lang.ClassLoader.defineClass1（本机方法）

 在java.lang.ClassLoader.defineClass（ClassLoader.java:698）

你会得到想法。我可以不运行引用android代码的代码在junit测试？

解决方案

你不能这样做，因为它不是可以使用JUnit测试Android的资源，无需进一步的指示。你必须首先调整你的项目。本教程和以下内容很好地描述了这个过程：

http://mylifewithandroid.blogspot.com/2008/11/controlling-instrumentation.html

http://mylifewithandroid.blogspot.com/2008/11/junit-in-android.html

这是另一个测试项目的解释代码snipplet：
http://marakana.com/tutorials/android/junit-test-example.html

在这里你可以在Stack Overflow上找到答案：
https：// stackoverflow。 com / questions / 522312 / for-unit-testing-android-apps的最佳做法

I have a custom timer that extends android.os.CountDownTimer. I have a test in the test project (standard Android/Eclipse project config) that tests the custom Timer. When I run this test, I get:

java.lang.NoClassDefFoundError: android/os/CountDownTimer
  at java.lang.ClassLoader.defineClass1(Native Method)
  at java.lang.ClassLoader.defineClass(ClassLoader.java:698)

You get the idea. Can I not run code that references android code code in junit test?

解决方案

You can't do that because it isn't possible to test Android's resources with JUnit without further instructions. You have to instrument your project first. This tutorials and the following describes this procedure very well:

http://mylifewithandroid.blogspot.com/2008/11/controlling-instrumentation.html
http://mylifewithandroid.blogspot.com/2008/11/junit-in-android.html

Here is an explained code snipplet of another test project: http://marakana.com/tutorials/android/junit-test-example.html

And here you can find the answer on Stack Overflow: https://stackoverflow.com/questions/522312/best-practices-for-unit-testing-android-apps

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