Android：无法实例化 C2DMBaseReceiver

Question

我直接将所有三个 C2DM 类从 Google Code 的 ChomeToPhone 扩展复制到我的项目中 (http://code.google.com/p/chrometophone/.../c2dm），然后修改我的按照 Android 云到设备消息传递框架页面上的说明进行清单。当我运行我的程序时，出现以下错误。我不明白发生了什么或为什么：

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，您无法实例化它。您应该子类化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中。

Answer 2

C2DMBaseReceiver是抽象类：
public Abstract class C2DMBaseReceiver extends IntentService{...}

抽象类无法实例化，但可以进行子类化。