Question

I am trying to retrieve my GCM registration ID from my android emulator but when i debug the program crashes.
This is my MainActivity code:

  try {
       GCMRegistrar.checkDevice(this);       //  <-- Crashes here
       GCMRegistrar.checkManifest(this);
       final String regId = GCMRegistrar.getRegistrationId(this);
       if (regId.equals("")) 
       {
         GCMRegistrar.register(this,Sender_ID);
       }
       else
       {
         Log.v("Registrationnnnnn", "Already registered");
       }
   }
   catch(Exception e)
   {
       Log.e("ErrorHAi",e.getMessage());
   }

I’ve read that this line checks if the device support GCM.But I’ve installed Google Cloud Messaging from SDK Manager extras. I’ve also installed

Android SDK Tools : rev 20
Android SDK Platform Tools : rev 12
Android 4.1 Api 16

When I mention

<uses-sdk android:minSdkVersion="8" android:targetSdkVersion="16" />

this in my manifest file it runs but crashes as I’ve mentioned in the above code.But if I change the targetSdkVersion to xx as mentioned here it says Install_Failed_OLDER_SDK.

I am currently running this application on Android 4.1 API level 16.

Update:

My Logcat:

07-03 20:34:25.878: E/Trace(906): error opening trace file: No such file or directory (2)
07-03 22:30:57.748: E/Trace(1016): error opening trace file: No such file or directory (2)
07-03 22:31:01.998: E/AndroidRuntime(1016): FATAL EXCEPTION: main
07-03 22:31:01.998: E/AndroidRuntime(1016): java.lang.RuntimeException: Unable to instantiate receiver com.pack.gcm.MyBroadcastReceiver: java.lang.ClassNotFoundException: com.pack.gcm.MyBroadcastReceiver
07-03 22:31:01.998: E/AndroidRuntime(1016):     at android.app.ActivityThread.handleReceiver(ActivityThread.java:2210)
07-03 22:31:01.998: E/AndroidRuntime(1016):     at android.app.ActivityThread.access$1500(ActivityThread.java:130)
07-03 22:31:01.998: E/AndroidRuntime(1016):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1271)
07-03 22:31:01.998: E/AndroidRuntime(1016):     at android.os.Handler.dispatchMessage(Handler.java:99)
07-03 22:31:01.998: E/AndroidRuntime(1016):     at android.os.Looper.loop(Looper.java:137)
07-03 22:31:01.998: E/AndroidRuntime(1016):     at android.app.ActivityThread.main(ActivityThread.java:4745)
07-03 22:31:01.998: E/AndroidRuntime(1016):     at java.lang.reflect.Method.invokeNative(Native Method)
07-03 22:31:01.998: E/AndroidRuntime(1016):     at java.lang.reflect.Method.invoke(Method.java:511)
07-03 22:31:01.998: E/AndroidRuntime(1016):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
07-03 22:31:01.998: E/AndroidRuntime(1016):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
07-03 22:31:01.998: E/AndroidRuntime(1016):     at dalvik.system.NativeStart.main(Native Method)
07-03 22:31:01.998: E/AndroidRuntime(1016): Caused by: java.lang.ClassNotFoundException: com.pack.gcm.MyBroadcastReceiver
07-03 22:31:01.998: E/AndroidRuntime(1016):     at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
07-03 22:31:01.998: E/AndroidRuntime(1016):     at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
07-03 22:31:01.998: E/AndroidRuntime(1016):     at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
07-03 22:31:01.998: E/AndroidRuntime(1016):     at android.app.ActivityThread.handleReceiver(ActivityThread.java:2205)
07-03 22:31:01.998: E/AndroidRuntime(1016):     ... 10 more

Now I don’t know why it is giving such errors although I’ve installed all the prerequisites.

Answer 1

Mostly Android G2DM not supporting Android emulator because it is basically depends on that the device has a google account , and the android emulators doesn’t have such an account so when it try to register the device , it doesn’t find the required google account to complete registration take a look at c2dm-only-registered-google-account-receives-messages-from-server