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Notice that we have declared the notifyIncomingMessage method to process the message. Again, a real application should receive the message on a separate thread.
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So far, this all works well as long as our app is running. But what if it isn t running If we expect to receive messages on port 4000, and the phone receives a message for that port while the app isn t running, the message is simply discarded. It will not be presented to the user, and the app will not be notified. For BlackBerry CLDC applications, the simplest way to handle this is to have your application automatically start on boot-up. It can then use the above approaches to open a MessageConnection and either register as a listener or create a thread that calls receive(). Once a message arrives, you can process it, calling UiApplication.requestForeground() to bring up your UI if so desired. MIDlets, however, cannot automatically start on boot-up. If you are writing a MIDlet, you must register with the push registry. The push registry is a component of the device AMS that is responsible for starting up apps when certain circumstances occur. In our particular case, we want to register to handle incoming messages. Push registry can take one of two forms: dynamic or static. Dynamic registration is done through application code. Imagine that someone is playing a mobile version of chess. They will start the game and start playing. The game notifies the push registry that it wants to handle incoming messages to port 6060. During a particularly long wait, the player exits the app so they can listen to some music. When the other player finally moves, their device sends your player a message to port 6060. The AMS notices the port number and automatically starts your chess game app back up again. At this point you can retrieve the incoming message and show the latest move. When registering with the push registry, you provide these three pieces of data: The connection URL describes the protocol and address of incoming connections; this is equivalent to the string that will be passed to Connector.open(). The MIDlet class name is the fully qualified MIDlet class that should be started when the message is received. The allowed sender indicates that the app should be started only if the connection came from this source. To register for all incoming SMS messages to a particular port, use something like this:
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PushRegistry.registerConnection ("sms://:4000", "com.apress.king.chess.ChessGame", "*");
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If you only want to receive from one specific sender, specify it in the last parameter.
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PushRegistry.registerConnection("sms://:4000", "com.apress.king.chess.ChessGame", "+14155550133");
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This method will throw a ClassNotFoundException if the class cannot be found, and an IOException if these is some other problem, such as another application already reserving the same port. You can call this method from a different class than the one that will be invoked. Dynamic registration can be handy. Among other advantages, it allows you to decide on the fly what port you want to use, perhaps based on what s available and what a server wants to use. It s also tougher for hackers to exploit a known port number and send your app data it isn t expecting. On the other hand, you cannot dynamically register an app until it is already running. That works fine for a chess game, but it means your app will no longer be started after the user reboots their phone, until they remember to start the app themselves. To get around this issue, consider using static registration. A static registration is declared in your application JAD or MANIFEST.MF file, and is registered with the AMS at the time the app is first installed. From that time on, your app will always be invoked whenever a matching message is received, even if it has never run before. As the example below shows, you provide the same information in static registration that you would use in dynamic registration, just as a standard name-value pair.
MIDlet-Push-1: sms://:4000, com.apress.king.chess.ChessGame, *
If your app registers for multiple types of incoming messages, or for other types of push notification, just keep incrementing the number after MIDlet-Push to MIDlet-Push-2, MIDletPush-3, and so on. Caution: Using static registration carries its own pitfalls. Your app must be guaranteed to start when an appropriate message is sent, so it can be installed only if the user has not already installed another app that registers for the same port number. To be as safe as possible, pick a random number that is high in the available range, and stay away from well-known port numbers.
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