how to sign up Android Cloud to Device Messaging
Saturday, June 25, 2011 by big big
what is Android Cloud to Device Messaging ? Android Cloud to Device Messaging (C2DM) is a service that helps developers send data from servers to their applications on Android devices. The service provides a simple, lightweight mechanism that servers can use to tell mobile applications to contact the server directly, to fetch updated application or user data. The C2DM service handles all aspects of queueing of messages and delivery to the target application running on the target device.
Note: Android C2DM will ultimately be available to all developers. However, it is currently launched in Labs, and not universally available. If you're interested in using C2DM with your Android applications, go to the signup page to request access. Google will contact you when you've been granted access.
Here are the primary characteristics of Android Cloud to Device Messaging (C2DM):
It allows third-party application servers to send lightweight messages to their Android applications. The messaging service is not designed for sending a lot of user content via the messages. Rather, it should be used to tell the application that there is new data on the server, so that the application can fetch it.
C2DM makes no guarantees about delivery or the order of messages. So, for example, while you might use this feature to tell an instant messaging application that the user has new messages, you probably would not use it to pass the actual messages.
An application on an Android device doesn’t need to be running to receive messages. The system will wake up the application via Intent broadcast when the the message arrives, as long as the application is set up with the proper broadcast receiver and permissions.
It does not provide any built-in user interface or other handling for message data. C2DM simply passes raw message data received straight to the application, which has full control of how to handle it. For example, the application might post a notification, display a custom user interface, or silently sync data.
It requires devices running Android 2.2 or higher that also have the Market application installed. However, you are not limited to deploying your applications through Market.
It uses an existing connection for Google services. This requires users to set up their Google account on their mobile devices.
source :http://code.google.com/android/c2dm/index.html
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