我有使用 WelcomeActivity 延伸 FragmentActivity 的项目。我用的是支持库，因此 Android的支持 - v4.jar 是库文件夹。当我运行这个程序，不存在任何问题。

I have a project which uses a WelcomeActivity which extends FragmentActivity. I use the support library, so android-support-v4.jar is in the libs folder. When I run this app, there are no problems.

不过，我想增加ActionBarSherlock到项目中。在ABS项目中，我使用 actionbarsherlock-插件 - 地图 - 4.1.0.jar 和 Android的支持-V4-R6-googlemaps.jar 在库文件夹。在我的应用程序的项目我添加了ABS库，当我尝试运行应用程序时，会出现此错误：

However, I want to add ActionBarSherlock to the project. In the ABS project I use actionbarsherlock-plugin-maps-4.1.0.jar and android-support-v4-r6-googlemaps.jar in the libs folder. In my app project I add the ABS library, and when I try to run the app, this error occurs:

UNEXPECTED TOP-LEVEL EXCEPTION:
java.lang.IllegalArgumentException: already added: Landroid/support/v4/accessibilityservice/AccessibilityServiceInfoCompat$AccessibilityServiceInfoStubImpl;

要解决这个问题，我删除了 Android的支持 - v4.jar 从我的应用程序的库文件夹。当我现在开始我的应用程序，该应用程序崩溃与此logcat的：

To solve this, I removed the android-support-v4.jar from my app's libs folder. When I now start my app, the app crashes with this logcat:

08-01 18:59:11.182: W/dalvikvm(13338): Unable to resolve superclass of Landroid/support/v4/app/FragmentActivity; (620)
08-01 18:59:11.182: W/dalvikvm(13338): Link of class 'Landroid/support/v4/app/FragmentActivity;' failed
08-01 18:59:11.182: W/dalvikvm(13338): Unable to resolve superclass of Lcom/myapp/welcome/WelcomeActivity; (109)
08-01 18:59:11.182: W/dalvikvm(13338): Link of class 'Lcom/myapp/welcome/WelcomeActivity;' failed
08-01 18:59:11.182: E/dalvikvm(13338): Could not find class 'com.myapp.welcome.WelcomeActivity', referenced from method com.myapp.MainDispatcherActivity.startWelcomeActivity
08-01 18:59:11.182: W/dalvikvm(13338): VFY: unable to resolve const-class 690 (Lcom/myapp/welcome/WelcomeActivity;) in Lcom/myapp/MainDispatcherActivity;
08-01 18:59:11.182: D/dalvikvm(13338): VFY: replacing opcode 0x1c at 0x0002
08-01 18:59:11.182: D/dalvikvm(13338): VFY: dead code 0x0004-000b in Lcom/myapp/MainDispatcherActivity;.startWelcomeActivity ()V
08-01 18:59:11.182: D/AndroidRuntime(13338): Shutting down VM
08-01 18:59:11.182: W/dalvikvm(13338): threadid=1: thread exiting with uncaught exception (group=0x40015560)
08-01 18:59:11.182: E/AndroidRuntime(13338): FATAL EXCEPTION: main
08-01 18:59:11.182: E/AndroidRuntime(13338): java.lang.NoClassDefFoundError: com.myapp.welcome.WelcomeActivity
08-01 18:59:11.182: E/AndroidRuntime(13338):    at com.myapp.MainDispatcherActivity.startWelcomeActivity(MainDispatcherActivity.java:33)
08-01 18:59:11.182: E/AndroidRuntime(13338):    at com.myapp.MainDispatcherActivity.startProperActivity(MainDispatcherActivity.java:26)
08-01 18:59:11.182: E/AndroidRuntime(13338):    at com.myapp.MainDispatcherActivity.onCreate(MainDispatcherActivity.java:19)
08-01 18:59:11.182: E/AndroidRuntime(13338):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
08-01 18:59:11.182: E/AndroidRuntime(13338):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
08-01 18:59:11.182: E/AndroidRuntime(13338):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
08-01 18:59:11.182: E/AndroidRuntime(13338):    at android.app.ActivityThread.access$1500(ActivityThread.java:117)
08-01 18:59:11.182: E/AndroidRuntime(13338):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
08-01 18:59:11.182: E/AndroidRuntime(13338):    at android.os.Handler.dispatchMessage(Handler.java:99)
08-01 18:59:11.182: E/AndroidRuntime(13338):    at android.os.Looper.loop(Looper.java:130)
08-01 18:59:11.182: E/AndroidRuntime(13338):    at android.app.ActivityThread.main(ActivityThread.java:3683)
08-01 18:59:11.182: E/AndroidRuntime(13338):    at java.lang.reflect.Method.invokeNative(Native Method)
08-01 18:59:11.182: E/AndroidRuntime(13338):    at java.lang.reflect.Method.invoke(Method.java:507)
08-01 18:59:11.182: E/AndroidRuntime(13338):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:862)
08-01 18:59:11.182: E/AndroidRuntime(13338):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:620)
08-01 18:59:11.182: E/AndroidRuntime(13338):    at dalvik.system.NativeStart.main(Native Method)

我该如何解决这个问题？

How can I fix this?

修改 我有另外一个项目，它使用相同的ABS库，并运行良好。我不知道我做了什么不同，或者是设置错了。

Edit I have another project which uses the same ABS library, and runs fine. I have no idea what I've done differently, or which settings are wrong.

推荐答案

这似乎发生了这个错误，因为我没有这条线在AndroidManifest.xml文件，在＆lt;应用＆GT; 标签：

It seems this error occurred because I didn't have this line in the AndroidManifest.xml file, in the <application> tag:

<uses-library android:name="com.google.android.maps" />