Android 蓝牙4.0官方demo(android系统4.3以上，手机支持蓝牙4.0，搜索，配对，连接，发现服务及特征值，断开连接等功能)-Android bluetooth 4.0 official demo (Android 4.3 above, phone support bluetooth 4.0, search, matching, connection, found that service and characteristic value, disconnects, etc)