Android 测试仪器期间出现 ClassNotFoundException
我见过很多处理此错误的主题,但找不到有效的解决方案。所以我会尝试完整地描述这个问题。
我有一个项目和一个项目测试。我的项目清单:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.toto.app"
android:versionCode="3"
android:versionName="0.3.1">
...
<application android:icon="@drawable/icon" android:label="@string/app_name">
...
</application>
</manifest>
和我的测试项目清单:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.toto.app.test"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="4" />
<instrumentation android:targetPackage="com.toto.app" android:name="android.test.InstrumentationTestRunner" />
<application android:icon="@drawable/icon" android:label="@string/app_name">
<uses-library android:name="android.test.runner" />
</application>
</manifest>
这是我要测试的活动:src/com/toto/app/activity/ListActivity,我有一个启动此活动的 LaunchActivity (在清单中声明为启动活动)。
在测试中,我的ListActivityTest位于同一路径(src/com/toto/app/activity)。我也尝试过 src/com/toto/app/test。来源是:
public class ListActivityTest extends ActivityInstrumentationTestCase2<LaunchActivity>{
private Solo solo;
public ListActivityTest() {
super(LaunchActivity.class);
}
public void setUp() throws Exception {
solo = new Solo(getInstrumentation(), getActivity());
solo.wait(2000);
}
}
似乎找到了 LaunchActivity,但是当它启动 ListActivity 时,我收到错误:
% adb shell am Instrument -w com.toto.app.test/android.test.InstrumentationTestRunner
com.toto.app.activity.ListActivityTest:INSTRUMENTATION_RESULT:shortMsg = java.lang.ClassNotFoundException INSTRUMENTATION_RESULT:longMsg = java.lang.ClassNotFoundException:加载器dalvik.system.PathClassLoader中的com.toto.app.activity.ListActivity [/system/framework/android.test.runner.jar:/data/app/com.toto.app .test-2.apk:/data/app/com.toto.app-2.apk]
我不明白为什么找到一个类而另一个没有找到......在 Eclipse 中也以同样的方式失败。我尝试在测试用例中直接使用 ListActivity 但出现同样的错误。它如何构建这个 apk 以避免某些类?
这是使用 adb 时的完整堆栈。
eclipse logcat 中的完整堆栈:
java.lang.NoClassDefFoundError: com.toto.app.activity.ListActivity
at com.toto.app.activity.LaunchActivity.onCreate(LaunchActivity.java:19)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1072)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1794)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1851)
at android.app.ActivityThread.access$1500(ActivityThread.java:132)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1038)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:143)
at android.app.ActivityThread.main(ActivityThread.java:4293)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.ClassNotFoundException: com.toto.app.activity.ListActivity in loader dalvik.system.PathClassLoader[/system/framework/android.test.runner.jar:/data/app/com.toto.app.test-2.apk:/data/app/com.toto.app-1.apk]
at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:240)
at java.lang.ClassLoader.loadClass(ClassLoader.java:551)
at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
... 14 more
I've seen many topics dealing with this error but could not found a working solution. So I'll try to describe the problem completely.
I've got a project and a project test. My project manifest :
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.toto.app"
android:versionCode="3"
android:versionName="0.3.1">
...
<application android:icon="@drawable/icon" android:label="@string/app_name">
...
</application>
</manifest>
And my test project manifest :
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.toto.app.test"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="4" />
<instrumentation android:targetPackage="com.toto.app" android:name="android.test.InstrumentationTestRunner" />
<application android:icon="@drawable/icon" android:label="@string/app_name">
<uses-library android:name="android.test.runner" />
</application>
</manifest>
Here is the activity i want to test : src/com/toto/app/activity/ListActivity, I've got a LaunchActivity (declared as start activity in manifest) that launch this activity.
And in the test, my ListActivityTest is in the same path (src/com/toto/app/activity). I've also tried with src/com/toto/app/test. The source is :
public class ListActivityTest extends ActivityInstrumentationTestCase2<LaunchActivity>{
private Solo solo;
public ListActivityTest() {
super(LaunchActivity.class);
}
public void setUp() throws Exception {
solo = new Solo(getInstrumentation(), getActivity());
solo.wait(2000);
}
}
The LaunchActivity seems to be found but when it launch the ListActivity, i've got the error :
% adb shell am instrument -w com.toto.app.test/android.test.InstrumentationTestRunner
com.toto.app.activity.ListActivityTest:INSTRUMENTATION_RESULT: shortMsg=java.lang.ClassNotFoundException
INSTRUMENTATION_RESULT: longMsg=java.lang.ClassNotFoundException: com.toto.app.activity.ListActivity in loader dalvik.system.PathClassLoader[/system/framework/android.test.runner.jar:/data/app/com.toto.app.test-2.apk:/data/app/com.toto.app-2.apk]
I don't understand why one class is found and the other is not... It fails in the same way in Eclipse. I tried to use directly ListActivity in the testcase but same error. How does it build this apk to avoid some class ?
This is the full stack when using adb.
The full stack in eclipse logcat :
java.lang.NoClassDefFoundError: com.toto.app.activity.ListActivity
at com.toto.app.activity.LaunchActivity.onCreate(LaunchActivity.java:19)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1072)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1794)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1851)
at android.app.ActivityThread.access$1500(ActivityThread.java:132)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1038)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:143)
at android.app.ActivityThread.main(ActivityThread.java:4293)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.ClassNotFoundException: com.toto.app.activity.ListActivity in loader dalvik.system.PathClassLoader[/system/framework/android.test.runner.jar:/data/app/com.toto.app.test-2.apk:/data/app/com.toto.app-1.apk]
at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:240)
at java.lang.ClassLoader.loadClass(ClassLoader.java:551)
at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
... 14 more
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这是因为我的Activity扩展了一个FragmentActivity,而不是一个简单的Activity。
为了解决这个问题,我必须在主项目中导出 android-support-v4.jar 。
希望能帮助其他人...
It is because my activity extends a FragmentActivity, not a simple Activity.
To resolve the problem, I had to export android-support-v4.jar in the main project.
Hope that will help others...