Android bluetooth

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在SystemServer启动的时候，会生成一个BluetoothDeviceService的实例

//skip bluetooth if we have an emulator kernel

//TODO:Use a more reliable check to see if this product should
// support Bluetooth
if(SystemProperties.get("ro.kernel.qemu").equals("1")){
   Log.i(TAG, "Registering null Bluetooth Service(Emulator)");
   ServiceManager.addService(Context.BLUETOOTH_SERVICE,null);
} else if(factoryTest == SystemServer.FACTORY_TEST_LOW_LEVEL) {
   Log.i(TAG, "Registering null Bluetooth Service(factory test)");
   ServiceManager.addService(Context.BLUETOOTH_SERVICE,null);
} else {
   Log.i(TAG, "Starting Bluetooth Service");
   bluetooth = new BluetoothDeviceService(context);
   bluetooth.init();
   ServiceManager.addService(Context.BLUETOOTH_SERVICE,bluetooth);

   int bluetoothOn = Settings.System.getInt(mContentResolver,Settings.System.BLUETOOTH_ON, 0);
   if( bluetoothOn > 0){
       bluetooth.enable(null);
   }
}

BluetoothDeviceService会生成一个BluetoothEventLoop的实例，它们两者均通过DBUS来和
BlusZ通信。BluetoothDeviceService是通过DBUS向BlueZ发送命令，儿命令的返回结果则是
由BlueZ通过DBUS传回给BluetoothEventLoop的（具体交互请参加BlueZ的dbus_api.txt）,
BlueZ也会通过DBUS向BluetoothEventLoop发送一些事件通知。BluetoothEventLoop和外部
的接口是通过预先定义的Intent,
初始的时候蓝牙是没有使能的，是通过BluetoothSettings或者WirelessSettings来打开蓝牙设备
，然后通过BluetoothSettings去查找附近的其他蓝牙设备，找到后可以建立RFCOMM连接和配对。