开机就能自动启动MIDlet一直是J2ME开发者的梦想,这一梦想在索尼爱立信的JP7平台上实现了。不过需要注意的是早期的几款机型不支持,比如K790等。具体请参考索尼爱立信的手册。
开机自启动功能是通过Push注册来完成的,因此可以使用两种方式来注册。第一种通过在jad文件注明PUSH注册的方式即可,如下。
//MIDlet-Push-: , , MIDlet-Push-1: autostart://:, AutoStartStatic, *
请注意URL的写法是autostart://:
如果想动态注册,可以通过下面的方法。
//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); }
由于手头没有SonyEricsson JP7平台的手机,因此没有办法测试开机自动启动功能。有条件的可以自己测试一下。