android - Urban Airship NPE

Question

我在安装我的应用程序时收到以下 NPE。请帮忙。

07-22 16:27:06.380: E/UA AP(6071): Unable to takeOff automatically
07-22 16:27:06.385: D/AndroidRuntime(6071): Shutting down VM
07-22 16:27:06.385: W/dalvikvm(6071): threadid=1: thread exiting with uncaught exception (group=0x415db2a0)
07-22 16:27:06.385: E/AndroidRuntime(6071): FATAL EXCEPTION: main
07-22 16:27:06.385: E/AndroidRuntime(6071): java.lang.RuntimeException: Unable to start receiver com.urbanairship.push.GCMPushReceiver: java.lang.NullPointerException
07-22 16:27:06.385: E/AndroidRuntime(6071): at android.app.ActivityThread.handleReceiver(ActivityThread.java:2277)
07-22 16:27:06.385: E/AndroidRuntime(6071): at android.app.ActivityThread.access$1500(ActivityThread.java:140)
07-22 16:27:06.385: E/AndroidRuntime(6071): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
07-22 16:27:06.385: E/AndroidRuntime(6071): at android.os.Handler.dispatchMessage(Handler.java:99)
07-22 16:27:06.385: E/AndroidRuntime(6071): at android.os.Looper.loop(Looper.java:137)
07-22 16:27:06.385: E/AndroidRuntime(6071): at android.app.ActivityThread.main(ActivityThread.java:4898)
07-22 16:27:06.385: E/AndroidRuntime(6071): at java.lang.reflect.Method.invokeNative(Native Method)
07-22 16:27:06.385: E/AndroidRuntime(6071): at java.lang.reflect.Method.invoke(Method.java:511)
07-22 16:27:06.385: E/AndroidRuntime(6071): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006)
07-22 16:27:06.385: E/AndroidRuntime(6071): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773)
07-22 16:27:06.385: E/AndroidRuntime(6071): at dalvik.system.NativeStart.main(Native Method)
07-22 16:27:06.385: E/AndroidRuntime(6071): Caused by: java.lang.NullPointerException
07-22 16:27:06.385: E/AndroidRuntime(6071): at com.urbanairship.UAirship.getPackageName(Unknown Source)
07-22 16:27:06.385: E/AndroidRuntime(6071): at com.urbanairship.push.GCMPushReceiver.onReceive(Unknown Source)
07-22 16:27:06.385: E/AndroidRuntime(6071): at android.app.ActivityThread.handleReceiver(ActivityThread.java:2270)
07-22 16:27:06.385: E/AndroidRuntime(6071): ... 10 more

尽管我得到了这个，但我能够启动该应用程序。运行时:

url -X POST -u "<app id>:<mastersecret>" -H "Content-Type: application/json" --data '{"android": {"alert": "TestPushtoAPID"}, "apids": ["****4"]}' https://go.urbanairship.com/api/push/

我收到以下回复:

{
    "push_id": "33e95250-f2b9-11e2-a8d0-14feb5d31f47"
}

尽管如此，我还是无法在我的设备上看到任何通知。

Part of Android Manifest 
<!-- REQUIRED for Urban Airship GCM--> 
<receiver android:name="com.urbanairship.CoreReceiver" /> 
<receiver android:name="com.urbanairship.push.GCMPushReceiver" android:permission="com.google.android.c2dm.permission.SEND"> 
    <intent-filter> 
        <action android:name="com.google.android.c2dm.intent.RECEIVE" /> 
        <action android:name="com.google.android.c2dm.intent.REGISTRATION" />
    </intent-filter>
</receiver>

MainActivity 的一部分:

UAirship.takeOff(this.getApplication(), options); 
PushManager.enablePush(); 
PushManager.shared().setIntentReceiver(IntentReceiver.class); 
String apid = PushManager.shared().getAPID();

Answer 1

实际上问题出在库的正确实现上。

takeOff 以及其他配置代码应该在 Application 的 OnCreate 中用于 maintaining global state of the application 的类.这是我们大多数人出错的地方。我们把它放在前台Activity的OnCreate。

接下来，您需要在应用程序标记内的 AndroidManifest.xml 中提及您正在使用的 Application 类的完全限定名称这样:

 <application
        android:name="com.popa.app.MyApplication"
        ..

This 是 original docs of UA 中提到的实现方式.