我正在为推送通知开发Android原生扩展。我已将gcm库添加到类路径，但找不到类GoogleCloudMessaging。即使认为谷歌的jar被添加到android项目的类路径，我仍然得到错误消息，所以在我导出jar之后我用Google gcm jar中的类进行更新。在此之后，一切看起来都在罐子级别，但问题仍然存在，我有以下错误：
W/dalvikvm(10513): VFY: unable to resolve static method 2592: Lcom/google/android/gms/gcm/GoogleCloudMessaging;.getInstance (Landroid/content/Context;)Lcom/google/android/gms/gcm/GoogleCloudMessaging;
08-17 19:32:10.328: W/dalvikvm(10513): threadid=16: thread exiting with uncaught exception (group=0x40adb9f0)
08-17 19:32:10.348: E/AndroidRuntime(10513): FATAL EXCEPTION: AsyncTask #1
08-17 19:32:10.348: E/AndroidRuntime(10513): java.lang.RuntimeException: An error occured while executing doInBackground()
08-17 19:32:10.348: E/AndroidRuntime(10513): at android.os.AsyncTask$3.done(AsyncTask.java:278)
08-17 19:32:10.348: E/AndroidRuntime(10513): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
08-17 19:32:10.348: E/AndroidRuntime(10513): at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
08-17 19:32:10.348: E/AndroidRuntime(10513): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
08-17 19:32:10.348: E/AndroidRuntime(10513): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
08-17 19:32:10.348: E/AndroidRuntime(10513): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
08-17 19:32:10.348: E/AndroidRuntime(10513): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
08-17 19:32:10.348: E/AndroidRuntime(10513): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
08-17 19:32:10.348: E/AndroidRuntime(10513): at java.lang.Thread.run(Thread.java:856)
08-17 19:32:10.348: E/AndroidRuntime(10513): Caused by: java.lang.NoClassDefFoundError: com.google.android.gms.gcm.GoogleCloudMessaging
08-17 19:32:10.348: E/AndroidRuntime(10513): at com.microsoft.windowsazure.notifications.NotificationsManager$1.doInBackground(NotificationsManager.java:43)
08-17 19:32:10.348: E/AndroidRuntime(10513): at com.microsoft.windowsazure.notifications.NotificationsManager$1.doInBackground(NotificationsManager.java:1)
08-17 19:32:10.348: E/AndroidRuntime(10513): at android.os.AsyncTask$2.call(AsyncTask.java:264)
08-17 19:32:10.348: E/AndroidRuntime(10513): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
08-17 19:32:10.348: E/AndroidRuntime(10513): ... 5 more