在索尼愛立信JP7平台上自動啟動MIDlet

開機就能自動啟動MIDlet一直是J2ME開發者的夢想，這一夢想在索尼愛立信的JP7平台上實現了。不過需要注意的是早期的幾款機型不支持，比如K790等。具體請參考索尼愛立信的手冊。

開機自啟動功能是通過Push注冊來完成的，因此可以使用兩種方式來注冊。第一種通過在jad文件注明PUSH注冊的方式即可，如下。

//MIDlet-Push-<n>: <ConnectionURL>, <MIDletClassName>, <AllowedSender>
MIDlet-Push-1: autostart://:, AutoStartStatic, *

請注意URL的寫法是autostart://: 

如果想動態注冊，可以通過下面的方法。

//Registers the pushRegistry
public void Register(){
        // List of registered push connections.
        String connections[];
        // Check to see if the connection has been registered.
        // This is a dynamic connection allocated on first
        // time execution of this MIDlet.
        connections = PushRegistry.listConnections(false);
        if (connections.length == 0) {
                try {
                        //Register so the MIDlet will wake up when phone is started.
                        PushRegistry.registerConnection("autostart://:", "AutoStartDyn", "*");
                        sDisplayString = "MIDlet is registered";
                } catch (Exception ex) {
                        System.out.println("Exception: " + ex);
                        sDisplayString = "Fail: " + ex;
                }
        } else {
                sDisplayString = "Already registered";
        }
        displayForm.deleteAll();
        displayForm.append(sDisplayString);
}

//Unregisters the pushRegistry
public void Unregister(){
        if (PushRegistry.unregisterConnection("autostart://:")){
                System.out.println("The pushRegistry is unregistered");
                sDisplayString = "MIDlet is unregistered.";
        }else{
                System.out.println("There is no pushRegistry to unregister");
                sDisplayString = "No MIDlet to unregister or failed to unregister";
        }
        displayForm.deleteAll();
        displayForm.append(sDisplayString);
}

由於手頭沒有SonyEriCSSon JP7平台的手機，因此沒有辦法測試開機自動啟動功能。有條件的可以自己測試一下。