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2. •Google Cloud Messaging for Android (GCM) is a free
service that helps developers send data from servers to
their Android applications on Android devices.
•Message containing up to 4kb of payload data.
•The GCM service handles all aspects of queuing of
messages and delivery to the target Android application
running on the target device.
•It doesn’t necessary that your application in running state
24X7.

3. 1. Application Server.
2. Google Account.
3. Android Phone/ emulator(Google API).

4. 1. Registration ID- An ID issued by the GCM servers to the Android application
that allows it to receive messages. Once the Android application has the registration
ID, it sends it to the 3rd-party application server, which uses it to identify each
device that has registered to receive messages for a given Android application. In
other words, a registration ID is tied to a particular Android application running on a
particular device.
2. Sender Auth Token- An API key that is saved on the 3rd-party application
server that gives the application server authorized access to Google services. The
API key is included in the header of POST requests that send messages.
3. Sender ID- A project ID you acquire from the API console The sender ID is used
in the registration process to identify an Android application that is permitted to
send messages to the device.
4. Pay Load – your data.

5. 1.Client will send activation
request, via our application
2.Client will receive
response with unique
Registration ID.
5. GCM server push the
data with GCM technology
3.Client need to send this
Registration ID, to our app
server. This registration ID
is used to send data to the
phone.
4.When ever server have any
message for a particular
device , it send the request to
the GCM server using
Registration ID.

6. You need to create a Google API project open the following link
https://code.google.com/apis/console/
and
activate GCM API service to your project
Note down:
1. Project Number(SENDER ID)
2. API key(Sender Auth Token)

7. Permission:
<manifest package=“in.seriousandroiddeveloper.gcm" ...>
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" />
<permission android:name=“in.seriousandroiddeveloper.gcm.permission.C2D_MESSAGE"
android:protectionLevel="signature" />
<uses-permission android:name="in.seriousandroiddeveloper.gcm.permission.C2D_MESSAGE" />
<receiver android:name=".SeriousBroadcastReceiver"
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" />
<category android:name="in.seriousandroiddeveloper.gcm" />
</intent-filter>
</receiver>

8. Registration :
Intent registrationIntent = new
Intent("com.google.android.c2dm.intent.REGISTER");
registrationIntent.putExtra("app", PendingIntent.getBroadcast(v.getContext(), 0,
new Intent(), 0));
registrationIntent.putExtra("sender", SenderID);
startService(registrationIntent);
Deactivation:
Intent unregIntent = new Intent("com.google.android.c2dm.intent.UNREGISTER");
unregIntent.putExtra("app", PendingIntent.getBroadcast(v.getContext(), 0, new
Intent(), 0));
startService(unregIntent);

9. Create a Broadcaster Receiver class:
SeriousBroadcastReceiver
public class SeriousBroadcastReceiver extends BroadcastReceiver {
public void onReceive(Context context, Intent intent) {
try {
String action = intent.getAction();
if (action.equals("com.google.android.c2dm.intent.REGISTRATION")) {
String registrationId = intent.getStringExtra("registration_id");
String error = intent.getStringExtra("error");
String unregistered = intent.getStringExtra("unregistered");
}
else if (action.equals("com.google.android.c2dm.intent.RECEIVE")) {
String data1 = intent.getStringExtra(“data1");
String data2 = intent.getStringExtra(“data2");
}
} finally {
}}}

10. Processing (action.equals("com.google.android.c2dm.intent.REGISTRATION"))
String error = intent.getStringExtra("error")
If (error.equals.(“~~~~~~~~~”))
SERVICE_NOT_AVAILABLE The device can't read the response, or there was a 500/503
from the server that can be retried later. The Android application should use
exponential back-off and retry.
•ACCOUNT_MISSING-There is no Google account on the phone. The Android
application should ask the user to open the account manager and add a Google
account. Fix on the device side.
•AUTHENTICATION_FAILED-Bad Google Account password. The Android application
should ask the user to enter his/her Google Account password, and let the user retry
manually later. Fix on the device side.
•INVALID_SENDER-The sender account is not recognized. This must be fixed on the
Android application side. The developer must fix the application to provide the
right sender extra in thecom.google.android.c2dm.intent.REGISTER intent.
PHONE_REGISTRATION_ERROR-Incorrect phone registration with Google. This phone
doesn't currently support
GCM.INVALID_PARAMETERS-The request sent by the phone does not contain the
expected parameters. This phone doesn't currently support GCM.

11. Server implementation is via HTTP request :
To send a message, the application server issues a POST request to
https://android.googleapis.com/gcm/send.
A message request is made of 2 parts:
HTTP header and HTTP body.
The HTTP header
1.Authorization: key=YOUR_API_KEY
2. Content-Type: application/json for JSON; application/x-www-formurlencoded;charset=UTF-8 for plain text.
HTTP Body:
1. registration_id
2. data.<key>

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