bluetoothDraw的实时绘制心电图Demo，集合了蓝牙连接，搜索，扫描。自定义SurfaceView，背景画布网格绘制。自需要换UUID就能实时连接获取数据。-bluetoothDraw real-time rendering electrocardiogram Demo, a collection of Bluetooth connectivity, searching, scanning. Custom SurfaceView, background canvas draw grid