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Anyone doing C2DM on Android

Posted by: admin May 14, 2020 Leave a comment


I need to implement c2dm in my app. Is there anyone who is also doing this? Please help..some tutorials will be very helpful OR if you have completed your c2dm implementation then a tutorial is more than appreciated.

Please help.

How to&Answers:

I went ahead and downloaded the Chrome2Phone source code for android and understood how it works through that example, I had the most trouble implementing the server side of the App.

Download it from:

or svn it:

svn checkout http://chrometophone.googlecode.com/svn/trunk/ chrometophone-read-only

Basic things you should understand.

In the C2DMBaseReciever class you have:

    public final void onHandleIntent(Intent intent) {
        try {
            Context context = getApplicationContext();
            if (intent.getAction().equals(REGISTRATION_CALLBACK_INTENT)) {
                handleRegistration(context, intent);
            } else if (intent.getAction().equals(C2DM_INTENT)) {
                onMessage(context, intent);
            } else if (intent.getAction().equals(C2DM_RETRY)) {
                C2DMessaging.register(context, senderId);
        } finally {
            //  Release the power lock, so phone can get back to sleep.
            // The lock is reference counted by default, so multiple 
            // messages are ok.

            // If the onMessage() needs to spawn a thread or do something else,
            // it should use it's own lock.

This method recieves the intents from the C2DM service and handles them.

In the handleRegistration method you will see some code that looks like:

} else {
            try {
                onRegistrered(context, registrationId);
                C2DMessaging.setRegistrationId(context, registrationId);
                //Add some code here to send your server the registration ID for this phone.
            } catch (IOException ex) {
                Log.e(TAG, "Registration error " + ex.getMessage());

You then have to use the google oAuth login service to register your server to the service, once that is done you can send a message. When I was testing I was using curl to send http post requests to the server.

To register from the server:

curl https://www.google.com/accounts/ClientLogin -d Email=theEmailYouWhitelisted -d Passwd=pass****word -d accountType=HOSTED_OR_GOOGLE -d source=Google-cURL-Example -d service=ac2dm

You will get a message with an auth id. You then use that to send the messages. To send a message use:

curl --header "Authorization: GoogleLogin auth=**authFromRegistrationAbove**" "https://android.apis.google.com/c2dm/send" -d registration_id=**phoneRegistrationId(reciever)** -d "data.message=StringToPass" -d collapse_key=something -k

Download curl from:

Hope this helps.


a tutorial about c2dm client/server registration and sending/receiving of messages.


  • intent to request a registration id
  • receiver to receive registration id
  • url to call for registering the server
  • url to call for sending a message
  • broadcast receiver to receive the message