无法解析FragmentActivity的超类

Question

我在之前的机器上安装了我的环境，而且我在不同的MacBook上。由于一些奇怪的原因，我不断遇到一个问题FragmentActivity的问题。它一直说它找不到FragmentActivity类，虽然我的类路径中有支持jar，如图所示：

我看到的详细错误消息在这里：

10-23 23:10:16.300  26062-26062/com.testapp W/dalvikvm﹕ Unable to resolve superclass of Lcom/testapp/views/loginregistration/LoginView; (92)
10-23 23:10:16.300  26062-26062/com.testapp W/dalvikvm﹕ Link of class 'Lcom/testapp/views/loginregistration/LoginView;' failed
10-23 23:10:16.300  26062-26062/com.testapp D/AndroidRuntime﹕ Shutting down VM
10-23 23:10:16.300  26062-26062/com.testapp W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0x414f8700)
10-23 23:10:16.330  26062-26062/com.testapp E/AndroidRuntime﹕ FATAL EXCEPTION: main
    java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.testapp/com.testapp.views.loginregistration.LoginView}: java.lang.ClassNotFoundException: Didn't find class "com.testapp.views.loginregistration.LoginView" on path: DexPathList[[zip file "/system/framework/com.google.android.maps.jar", zip file "/data/app/com.testapp-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.testapp-1, /vendor/lib, /system/lib]]
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2137)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
            at android.app.ActivityThread.access$600(ActivityThread.java:141)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:5103)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:525)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: java.lang.ClassNotFoundException: Didn't find class "com.testapp.views.loginregistration.LoginView" on path: DexPathList[[zip file "/system/framework/com.google.android.maps.jar", zip file "/data/app/com.testapp-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.testapp-1, /vendor/lib, /system/lib]]
            at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:53)
            at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
            at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
            at android.app.Instrumentation.newActivity(Instrumentation.java:1061)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2128)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
            at android.app.ActivityThread.access$600(ActivityThread.java:141)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:5103)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:525)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
            at dalvik.system.NativeStart.main(Native Method)

我还缺少其他什么吗？

Answer 1

在IDE中（如屏幕截图所示），选中包含缺失类的类路径条目旁边的“导出”框。

我在Android支持库中遇到类似的问题（无法解析Lcom的超类... PagerAdapter）。事实证明，需要导出的.classpath中引用了一个库：

自：

<classpathentry 

要：

<classpathentry exported="true" ...

对于Eclipse用户，我通过在Java Build Path菜单中导出Android私有库来解决问题。