Android Google Cloud Messaging Server Side Code

GCM Server Side Application:

To create server side application, follow these steps:

1. Create a new java project as:

2. Enter name for new java project e.g. NotificationServer

3. Click on Next button. Add gcm-server.jar library and json-simple-1.1.1.jar library to this project by clicking on Add External JARs button. Specify your path of libraries to add to project.Then click on Finish button.

4. New java project is created now and available in Project Explorer.

5. Now create a package, by right click on src->new->package as:

6. Enter name of package and click on Finish button.

7. Now after creating package, add a class GCMServer to package and click on Finish button.

8. Finally, write the actual code to java project i.e. server side code. Here is complete code for server side implementation on java.


package com.push.notification.server;

import java.util.ArrayList;

import com.google.android.gcm.server.Message;
import com.google.android.gcm.server.MulticastResult;
import com.google.android.gcm.server.Result;
import com.google.android.gcm.server.Sender;

public class GCMServer {

    public static void main(String args[]) {

        new Thread(){

            public void run(){
    
                try {
                    //Please add here your project API key: "Key for browser apps (with referers)".
                    //If you added "API key Key for server apps (with IP locking)" or "Key for Android apps (with certificates)" here
                    //then you may get error responses.
                    Sender sender = new  Sender("AIzaSyB7Ej255tpTaemk_-Ljmn4GcklldT14Hp4");

                    // use this to send message with payload data
                    Message message = new Message.Builder()
                    .collapseKey("message")
                    .timeToLive(3)
                    .delayWhileIdle(true)
                    .addData("message", "Welcome to Push Notifications") //you can get this message on client side app
                    .build(); 
 
                    //Use this code to send notification message to a single device
                    Result result = sender.send(message,
                            "APA91bEbKqwTbvvRuc24vAYljcrhslOw-jXBqozgH8C2OB3H8R7U00NbIf1xp151ptweX9VkZXyHMik022cNrEETm7eM0Z2JnFksWEw1niJ2sQfU3BjQGiGMq8KsaQ7E0jpz8YKJNbzkTYotLfmertE3K7RsJ1_hAA",
                            1);
                    System.out.println("Message Result: "+result.toString()); //Print message result on console

                    //Use this code to send notification message to multiple devices
                    ArrayList<String> devicesList = new ArrayList<String>();
                    //add your devices RegisterationID, one for each device               
                    devicesList.add("APA91bEbKqwTbvvRuc24vAYljcrhslOw-jXBqozgH8C2OB3H8R7U00NbIf1xp151ptweX9VkZXyHMik022cNrEETm7eM0Z2JnFksWEw1niJ2sQfU3BjQGiGMq8KsaQ7E0jpz8YKJNbzkTYotLfmertE3K7RsJ1_hAA");   
                    devicesList.add("APA91bEVcqKmPnESzgnGpEstHHymcpOwv52THv6u6u2Rl-PaMI4mU3Wkb9bZtuHp4NLs4snBl7aXXVkNn-IPEInGO2jEBnBI_oKEdrEoTo9BpY0i6a0QHeq8LDZd_XRzGRSv_R0rjzzZ1b6jXY60QqAI4P3PL79hMg");   

                    //Use this code for multicast messages   
                    MulticastResult multicastResult = sender.send(message, devicesList, 0);
                    System.out.println("Message Result: "+multicastResult.toString());//Print multicast message result on console

                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }.start();   
    }
}

9. Copy this code to your project and then click on Run button to execute this java project.

This is all what you need to do on server side.For client end code please refer to "Google Cloud Messaging (GCM) Client Code".

In case of any query please don't hesitate to contact.
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