Android：无法实例化C2DMBaseReceiver

Question

我直接从Google Code的ChomeToPhone扩展（http://code.google.com/p/chrometophone/.../c2dm）将所有三个C2DM类复制到我的项目中，然后根据Android Cloud to Device Messaging Framework页面上的说明修改我的Manifest。当我运行我的程序时，出现以下错误。我想不通这是怎么回事，或者为什么：

06-12 18:50:43.243: ERROR/AndroidRuntime(923): FATAL EXCEPTION: main 
06-12 18:50:43.243: ERROR/AndroidRuntime(923): java.lang.RuntimeException: Unable to instantiate receiver com.name.asdf.C2DMBaseReceiver: java.lang.InstantiationException: com.name.asdf.C2DMBaseReceiver 
06-12 18:50:43.243: ERROR/AndroidRuntime(923):  at android.app.ActivityThread.handleReceiver(ActivityThread.java:2789) 
06-12 18:50:43.243: ERROR/AndroidRuntime(923):  at android.app.ActivityThread.access$3200(ActivityThread.java:125) 
06-12 18:50:43.243: ERROR/AndroidRuntime(923):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2083) 
06-12 18:50:43.243: ERROR/AndroidRuntime(923):  at android.os.Handler.dispatchMessage(Handler.java:99) 
06-12 18:50:43.243: ERROR/AndroidRuntime(923):  at android.os.Looper.loop(Looper.java:123) 
06-12 18:50:43.243: ERROR/AndroidRuntime(923):  at android.app.ActivityThread.main(ActivityThread.java:4627) 
06-12 18:50:43.243: ERROR/AndroidRuntime(923):  at java.lang.reflect.Method.invokeNative(Native Method) 
06-12 18:50:43.243: ERROR/AndroidRuntime(923):  at java.lang.reflect.Method.invoke(Method.java:521) 
06-12 18:50:43.243: ERROR/AndroidRuntime(923):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
06-12 18:50:43.243: ERROR/AndroidRuntime(923):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
06-12 18:50:43.243: ERROR/AndroidRuntime(923):  at dalvik.system.NativeStart.main(Native Method) 
06-12 18:50:43.243: ERROR/AndroidRuntime(923): Caused by: java.lang.InstantiationException: com.name.asdf.C2DMBaseReceiver 
06-12 18:50:43.243: ERROR/AndroidRuntime(923):  at java.lang.Class.newInstanceImpl(Native Method) 
06-12 18:50:43.243: ERROR/AndroidRuntime(923):  at java.lang.Class.newInstance(Class.java:1429) 
06-12 18:50:43.243: ERROR/AndroidRuntime(923):  at android.app.ActivityThread.handleReceiver(ActivityThread.java:2780) 
06-12 18:50:43.243: ERROR/AndroidRuntime(923):  ... 10 more 

Answer 1

C2DMBaseReceiver是一个抽象类，不能实例化。您应该子类C2DMBaseReceiver并提供您自己的实现。然后在清单中注册该类。请注意，您应该将该类放在包的根目录下。

Answer 2

C2DMBaseReceiver是抽象类： 公共抽象类C2DMBaseReceiver扩展IntentService {...}

抽象类不能被实例化，但它们可以被继承。