led分析（app->framework->jni->hal）

从上往下分析

1.notification的使用(app)

/**    * 发送通知    */   public void setNotification(){       /**  start */       //1.得到NotificationManager：       mNotificationManager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);       // 创建一个新的Notification对象，并添加图标       notification = new Notification();       // 通知显示的图标       notification.icon = R.drawable.icon_bao;       // 在状态栏(Status Bar)显示的通知文本提示，如：       notification.tickerText = "收到一个新的通知";       //发出提示音，如：       notification.defaults |= Notification.DEFAULT_SOUND;//或//       notification.sound =Uri.parse("file:///sdcard/notification/ringer.mp3");//或//       notification.sound = Uri.withAppendedPath(MediaStore.Audio.Media.INTERNAL_CONTENT_URI,"6");       //填充Notification的各个属性：       Context context = getApplicationContext();       CharSequence contentTitle = "通知标题";       CharSequence contentText = "通知内容";       //点击通知跳转到哪里       Intent notificationIntent = new Intent(this,CreateMemberActivity.class);       PendingIntent contentIntent = PendingIntent.getActivity(this, 0,notificationIntent, 0);       notification.setLatestEventInfo(context, contentTitle, contentText, contentIntent);       //在通知栏上点击此通知后自动清除此通知       notification.flags |= Notification.FLAG_AUTO_CANCEL;       //LED灯闪烁       notification.defaults |= Notification.DEFAULT_LIGHTS;//       或者可以自己的LED提醒模式://       notification.ledARGB = 0xff00ff00;//       notification.ledOnMS = 300; //亮的时间//       notification.ledOffMS = 1000; //灭的时间//       notification.flags |= Notification.FLAG_SHOW_LIGHTS;       //手机振动       notification.defaults |= Notification.DEFAULT_VIBRATE;//       或//       long[] vibrate = {0,100,200,300};//       notification.vibrate = vibrate;       //发送通知       mNotificationManager.notify(1,notification);       /**  end */}

NotificationManager.java(framework)

NotificationManagerService.java(framework)

mNotificationLight是一个Light对象，Light是一个抽象类，LightsService中定义了继承该类的实现类LightImpl

com_android_server_lights_LightsService.cpp(JNI)

HAL层

vendor/mediatek/proprietary/hardware/liblights/lights.c

这里可以控制各种通知对led控制的优先级

其他博客参考http://blog.csdn.net/u011630458/article/details/22280841