[Android] Android平台的蓝牙编程

2019-11-09 18:12:24

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前言

公司有个项目，是使用Android设备和嵌入式设备之间进行通讯，且通讯方式采用的是蓝牙连接的方式，蓝牙通讯相当于串口通讯，传输的都是字节流，所以需要自己设定通信协议，规定字节编解码的方法。本文主要说的是Android平台的蓝牙API使用方法。参考了百度上的文章，并且指出自己在使用Android蓝牙接口过程中遇到的困难。

使用

蓝牙编程和socket编程步骤很像。需要注意的是： * 服务端的Accept和客户端的connect操作都是阻塞的，所以需要在单开一个线程去操作，且两端的读写操作也都是阻塞的，也需要在独立的线程去操作。 * 必须使用Android的SSP（协议栈默认）的UUID： **00001101-0000-1000-8000-00805F9B34FB ** 才能正常和外部的，也是SSP串口的蓝牙设备去连接。

客户端主要函数（我是手动配对，然后连接的）

public class BluetoothClient extends Thread{ public BluetoothClient(ICallback callback) { super(callback); } PRivate BluetoothSocket mSocket; private BluetoothAdapter mAdapter; private BluetoothDevice mTargetServerDevice; protected InputStream mInStream; protected OutputStream mOutStream; public void init() { try{ mAdapter = BluetoothAdapter.getDefaultAdapter(); if (mAdapter == null){ mSocket = null; return;// Device does not support Bluetooth } if (!mAdapter.isEnabled()) { mAdapter.enable(); while(!mAdapter.isEnabled()){} } Set<BluetoothDevice> pairedDevices = mAdapter.getBondedDevices(); if (pairedDevices.size() > 0) { for (BluetoothDevice device : pairedDevices) { // Use a temporary object that is later assigned to mmSocket, because mmSocket is final if (device.getAddress().equals("00:04:3E:94:2C:FF")) { mTargetServerDevice = device; } } } mSocket = mTargetServerDevice.createRfcommSocketToServiceRecord (UUID.fromString("00001101-0000-1000-8000-00805F9B34FB")); }catch(Exception e){ throw new InitExecption(e); } } public void run() { if (mSocket == null){ return; } mAdapter.cancelDiscovery(); try { // Connect the device through the socket. This will block until it succeeds or throws an exception mSocket.connect(); mInStream = mSocket.getInputStream(); mOutStream = mSocket.getOutputStream(); } catch (IOException connectException) { if(mInStream != null){ try { mInStream.close(); } catch (IOException closeException) {} } if(mOutStream != null){ try { mOutStream.close(); } catch (IOException closeException) {} } if(mSocket != null){ try { mSocket.close(); } catch (IOException closeException) {} } throw new ConnectException(connectException); } // Do work to manage the connection (in a separate thread) }}

服务端主要代码

public class BluetoothServer extends Thread{ private final BluetoothServerSocket mServerSocket; private ManageThread mDataManager; public BluetoothServer() { // Use a temporary object that is later assigned to mmServerSocket,because mmServerSocket is final BluetoothServerSocket tmp = null; BluetoothAdapter mAdapter = BluetoothAdapter.getDefaultAdapter(); try { tmp = mAdapter.listenUsingRfcommWithServiceRecord ("server", UUID.fromString("00001101-0000-1000-8000-00805F9B34FB")); } catch (IOException e) { } mServerSocket = tmp; } public void run() { if (mServerSocket == null){ return; } BluetoothSocket socket = null; // Keep listening until exception occurs or a socket is returned while (true) { try { socket = mServerSocket.accept(); } catch (IOException e) { break; } // If a connection was accepted if (socket != null) { //todo 对socket进行操作（读和写都应该在各自独立的线程） break; } } }}

参考链接

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