Question

I am trying to use the GCM service in my android app.

For that, I used the android documentation from http://developer.android.com/guide/google/gcm/gcm.html

I created the client side registration process with the sender id etc and the server side application where I am using the registration id and the sender id to send messages.

When I am installing the app in my phone through Eclipse, the push notifications works fine, so the sender id i have is right.

Then, when i export the apk file with Eclipse and install it in my phone, I am getting the error message that the SenderId is wrong

MissmatchedSenderId

Anyone has an idea whyI am getting this.

I have read those topics:

Why do I get "MismatchSenderId" from GCM server side?

When sending messages using GCM, I keep getting the response 'MismatchSenderId'

But the strange thing in my case is that everything works fine before exporting the app as apk and then I have this problem.

Any idea is mostly wellcome.

Answer 1

I actually had the same problem, and was researching more than 10 hours.

I finally found out the problem!
Nothing related to the Server API key or Browser API Key or SenderID.
The problem was the Google documentation:

final String regId = GCMRegistrar.getRegistrationId(this);
if (regId.equals("")) {
  GCMRegistrar.register(this, SENDER_ID);
} else {
  Log.v(TAG, "Already registered");
}

Google says that you have to call the getRegistrationId function and only if the id is empty call register!
Which did not work for me at all… when I did that I always got back MismatchSenderId when sending to this regId.

My solution was:
Always call

GCMRegistrar.register(this, SENDER_ID);

and when the function

protected void onRegistered( Context c, String regId )

is called save the regId in my server database.

if I do it this way, all works fine!