Android 蓝牙

参考文章：http://wear.techbrood.com/guide/topics/connectivity/bluetooth.html ，这是developer.android.com在中国的一个镜像，大家可以收藏。

蓝牙连接初识

下图是对Android蓝牙连接的一个通俗的认识，有雷同，实属巧合。

主要有下面几个步骤：

一、Setting Up Bluetooth

1. 验证设备是否支持蓝牙
2. 打开蓝牙

二、查找设备

1. 请求已配对的设备
2. 加入没有请求到，则发现新的设备

三、连接设备

1. 作为client连接设备
2. 作为server连接设备

四、管理连接

1. 写数据（写数据到设备上）
2. 读数据（从设备读取数据）

心得体会

1. 发现新朋友是需要耗费很多资源，一旦发现了设备，在连接设备之前需要取消发现，否则会占用带宽 。
2. 安卓也提供了专门用于连接健康可穿戴设备的profile，即Health Device Profile (HDP)，用于封装和简化蓝牙连接。
   这是步骤：
   Creating an HDP Application

Here are the basic steps involved in creating an Android HDP application:

Get a reference to the BluetoothHealth proxy object.
Similar to regular headset and A2DP profile devices, you must call getProfileProxy() with a BluetoothProfile.ServiceListener and the HEALTH profile type to establish a connection with the profile proxy object.
Create a BluetoothHealthCallback and register an application configuration (BluetoothHealthAppConfiguration) that acts as a health sink.
Establish a connection to a health device. Some devices will initiate the connection. It is unnecessary to carry out this step for those devices.
When connected successfully to a health device, read/write to the health device using the file descriptor.
The received data needs to be interpreted using a health manager which implements the IEEE 11073-xxxxx specifications.
When done, close the health channel and unregister the application. The channel also closes when there is extended inactivity.