Android通报及receiver

Android通知及receiver

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1. BroadcastReceiver

BroadcastReceiver用来接收如电量低、信号弱等即时广播通知，发送侧调用Context.sendBroadcast(Intent)或Context.sendOrderedBroadcast(Intent)可发送这类广播通知，而BroadcastReceiver则用onReceive (Context, Intent)方法来处理到接受到的广播通知。一个BroadcastReceiver的生命周期和onReceive()一致，其宿主进程和Activity、Service的一样，因此在onReceive不能有长时间的循环处理，不能显示Dialog的UI。

一个BroadcastReceiver可以在AndroidManifest.xml中静态声明和在程序动态注册，其可处理的通知由在声明或注册时定义的IntentFilter决定。

notification.defaults |= Notification.DEFAULT_SOUND;notification.sound = Uri.parse("file:///sdcard/notification/ringer.mp3");   notification.defaults |= Notification.DEFAULT_VIBRATE;long[] vibrate = {0,100,200,300};notification.vibrate = vibrate;notification.defaults |= Notification.DEFAULT_LIGHTS;notification.ledARGB = 0xff00ff00;notification.ledOnMS = 300;   notification.ledOffMS = 1000;notification.flags |= Notification.FLAG_SHOW_LIGHTS; NotificationManager用来管理Notification，用Context.getSystemService(String)可从系统中获获取。NotificationManager的方法notify(int id, Notification)可以显示一个Notification到StatusBar上，方法cancel(int id)可删除一个Notification。参数ID用来标识Notification，在一个程序中必须唯一。String ns = Context.NOTIFICATION_SERVICE;NotificationManager mNotificationManager = (NotificationManager) getSystemService(ns);Notification notification = ...           // Notification设置mNotificationManager.notify(1, notification);

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