Wednesday, October 24, 2012

Java : Push notifications for iOS and Android

This post gives a small idea about the push notification of iOS and Android.
Life Cycle of Push notification looks as follows

Push Notification overview of APN and GCM Server as follows

IPhone / IPad
Login into developer console
Login into Google API console,
1. Creating the SSL certificate
1.1. Generating a Certificate Request
    Launch the Keychain Access application on your Mac.
    Select the menu item Keychain Access > Certificate Assistant > Request a Certificate From a Certificate Authority…
    Enter you name and email address (leave CA Email Address blank).
    Select "Saved to disk" to download the .certSigningRequest file to your desktop.

1.2 Creating and Configuring an AppID
                Navigate to the Apple Developer Member Center website, and enter the iOS Provisioning Portal.
                Select App IDs from the menu on the left.
                Select the "New App ID" button and create a new App ID. Make sure you do not enter the wildcard character ("*") in the "Bundle Identifier" field.
                Select "Configure" beside your newly created App ID.
                Check "Enable for Apple Push Notification service". Then, Click "Configure" beside the "Development Push SSL Certificate". The "Apple Push Notification service SSL Certificate Assistant" wizard should be displayed.
                Select "Continue", then select "Choose File" and locate the .certSigningRequest file you created in the previous step.
                Select "Generate" and download the generated SSL certificate.
                Double click on the downloaded SSL certificate to install it in your Keychain.
                In your keychain, under "My Certificates", find the certificate you just added. It should be called "Apple Development IOS Push Services: xxx".
                Right-click on it, select "Export Apple…", and save it as a .p12 file. Do not enter an export password when you prompted!

2. Creating the Provisioning Profile
    Select the "Provisioning" tab in the iOS Provisioning Portal.
    Create a new profile by selecting "New Profile".
    Fill in the information. Make sure you select your developer certificate, the App ID you just created, and the devices you'll be testing with.
    Download the generated Provisioning Profile by clicking the "Download" button under the "Actions" column.
    Install the profile by double-clicking on the downloaded file. This should open the iPhone Configuration Utility App.
3. Configuring the Parse App
                If you want your users to be able to send push notifications, you will need to toggle the "Client push enabled?" option to "on" under the "Push Notification Settings" header. This is useful for applications like chat clients, where users need to send push messages. For this tutorial, select toggle the option to "on".
If you haven't created an API project yet, this page will prompt you to do so:
Click Create project. Your browser URL will change to something like:

Note: #project: (4815162342 in this example). This is your project ID,
To enable the GCM service:
  1. In the main Google APIs Console page, select Services.
  2. Turn the Google Cloud Messaging toggle to ON.
Use bundle identifier in the project
Use the project ID (4815162342) in the project
P12 key is generated for the above bundle identifier, Use the p12 key and respective pwd to send push notification from your server to apple server
Create new Server key, which looks like
AIzaxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx and used to send push notification from your server to GCM server

Client Side Code
// Register for push notifications

[application registerForRemoteNotificationTypes:
UIRemoteNotificationTypeBadge |
UIRemoteNotificationTypeAlert |
// Register for push notifications
Handling Remote Notifications
public class GCMIntentService extends GCMBaseIntentService {
public GCMIntentService() {
// Here PRODUCT_ID is 4815162342
protected void onError(Context arg0, String arg1) {

protected void onMessage(Context arg0, Intent arg1) {

protected void onRegistered(Context arg0, String arg1) {

protected void onUnregistered(Context arg0, String arg1) {

for more details visit Android Guide GCM
Tells the delegate that the application successfully registered with Apple Push Service (APS).
Device Token is generated
Length of the device token is 64 bit.
Send Device Token to server, so it can use it to send push notification
onRegistered(Context context, String regId):
Called after a registration intent is received, passes the registration ID assigned by GCM to that device/application pair as parameter. Typically, you should send the regid to your server so it can use it to send messages to this device.
Java Server Side Code
Add jar file : JavaPNS_2.2.jar
Add Jar file : gcm-server.jar

Thanks for reading :).
Whether this post is helpful? Please leave a comment.


  1. Great info. Your post is so nice. I like your job. Thanks for sharing. desktop alerting software

  2. Hi,
    i am getting the below error 401, can u pls help me,

    Attempt #1 to send message Message(data: {message=2014/02/10 18:43}) to regIds APA91bE1C8nSrSUVmiDNIBp5bQavalDG_o0T4yC2ZN8bM_1kKvbp_Oj591ewJHE803HRHu7rPU2x_ZBISPEWuUwtPJF_WlSvIT7WtN-EguVcUHaUJ_R_GalpTK3TMeDjuMuGI0KPnmZYVUZtlINIK72fqAMd6SIWq-YNUauLOILfEWxfHP2q2lE
    Request body: registration_id=APA91bE1C8nSrSUVmiDNIBp5bQavalDG_o0T4yC2ZN8bM_1kKvbp_Oj591ewJHE803HRHu7rPU2x_ZBISPEWuUwtPJF_WlSvIT7WtN-EguVcUHaUJ_R_GalpTK3TMeDjuMuGI0KPnmZYVUZtlINIK72fqAMd6SIWq-YNUauLOILfEWxfHP2q2lE&data.message=2014%2F02%2F10+18%3A43
    Status inside sender class ------->401

    1. 401 is Authentication Error.
      1. Please check your API key. When API key is not valid then you will be getting 401 error.
      2. Invalid project number sent as key.
      3. Check your GCM service is enabled or not, Key valid but with GCM service disabled.

  3. KeystoreException

  4. can i use gcm-server.jar for ios also ?

  5. Nice Article, Blog theme is also very user friendly. Tech information is also good on this blog. Also checkout - Push Notifications with Delivery App