Android实现一对一蓝牙聊天APP

学习了,三天的Android 蓝牙开发,开始是一头雾水,看着别人讲的Google官方的demo感觉很容易,所有自己也尝试写一个很简单的聊天demo.可是想的很简单,自己做起来也花了,将近一天的时间才搞定这个基本的流程设计.下面是几点心得后面再贴代码

1）写一个简单的demo也好,记得一定需要有总体的流程,才开始抠代码
2）既然是demo毕竟就是新的知识,代码中间的log点一定\不能少,这是你快速调试的利器
3）还是thinking in java 里面的那句话,思考什么是可变的,什么是不可变的,然后分开,这样来实现代码的封装,感觉很不错了.只是现在感觉还是很难想明白
4）开始思考以面向对象的流程处理问题,需要怎么弄,也是封装代码的一种思想

蓝牙聊天的基本功能:

1.实现一对一蓝牙连接
2.实现一对一聊天

很简单的功能,思路看着也很清晰,可是深入去写,才知道,水还是深度的,java不熟的话.
此处基本的如何打开蓝牙不在复述,请自行百度.

思路:

1）初始化,打开手机的蓝牙,开始蓝牙服务器线程,等待连接
2）配对,获取某台手机的蓝牙address地址.
3）开启连接线程连接手机蓝牙
4）连接成功后,开启,蓝牙聊天的线程,进行聊天的通讯.

上面四步是主要思路,其中存在着几个细节的地方,就是在开发中某些逻辑问题,线程间的安全问题,也是需要好好处理的. 让我感受比较深的地方是,一对一聊天,相当于,首相每台机器都可能作为服务器在进行通讯,所以一开始开启了两个服务监听,一旦有一个接入进来,这里需要弄清楚哪个是接入对象,哪个是被接入对象, 没有作为服务端的,可以把服务端线程关闭掉。

下面贴点代码

/**
 * 客户端启动连接线程
 * 通过蓝牙的mac地址获取连接
 * @author Administrator
 *
 */
 private class ConnectThread extends Thread {

 private BluetoothDevice mDevice;
 private BluetoothSocket btSocket = null;

 public ConnectThread(String address) {
  // TODO Auto-generated constructor stub
  mDevice = mBluetoothAdapter.getRemoteDevice(address);
 }

 @Override
 public void run() {
  // TODO Auto-generated method stub
  connect(mDevice);
 }

 private void connect(BluetoothDevice btDev) {

  Method creMethod;
  try {
  creMethod = BluetoothDevice.class.getMethod("createBond");
  creMethod.invoke(btDev);

  } catch (Exception e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
  }
  try {
  btSocket = btDev.createRfcommSocketToServiceRecord(MYUUID);
  System.out.println("========" + "start connect");
  Log.d("BlueToothTestActivity", "开始连接...");
  btSocket.connect();
  mClientSocket = btSocket;
  isConnected=true;
  mHandler.sendEmptyMessage(SUCCESS_SERVICE_BEGIN_TALKING);

  // 作为客户端 关闭 服务端 等待的链接
  if (acceptThread != null) {
   acceptThread.close();
  }
  startTalk();
  } catch (IOException e) {
  // TODO Auto-generated catch block
  System.out.println("???????????????? close socket");
  close();
  System.out.println(e.toString());
  e.printStackTrace();
  }

 }

 private void close() {
  if (btSocket != null) {
  try {
   btSocket.close();
   mHandler.sendEmptyMessage(FAILED_SERVICE_SOCRCKET);
  } catch (IOException e1) {
   // TODO Auto-generated catch block
   e1.printStackTrace();
  }
  }
 }

}

/**
 * 服务端的设计
 * 每个蓝牙的客户端先要开启服务端等待接入
 * @author Administrator
 *
*/
 private class AcceptThread extends Thread {
 private final BluetoothServerSocket mmServerSocket;

 public AcceptThread() {
  // Use a temporary object that is later assigned to mmServerSocket,
  // because mmServerSocket is final
  BluetoothServerSocket tmp = null;
  try {
  // MY_UUID is the app's UUID string, also used by the client
  // code
  tmp = mBluetoothAdapter.listenUsingRfcommWithServiceRecord("Fisrt", MYUUID);
  } catch (IOException e) {
  mHandler.sendEmptyMessage(FAILED_SERVICE_SOCRCKET);

  }
  mmServerSocket = tmp;
 }

 public void run() {
  BluetoothSocket socket = null;
  // Keep listening until exception occurs or a socket is returned
  while (isRun) {
  try {
   socket = mmServerSocket.accept();
   mHandler.sendEmptyMessage(SUCCESS_SERVICE_SOCRCKET);

   Log.e("TAG", "========== server start ====");

  } catch (IOException e) {
   mHandler.sendEmptyMessage(FAILED_SERVICE_SOCRCKET);
   close();
  }

  // If a connection was accepted
  if (socket != null) {
   // 服务端连接成功,启动聊天线程,通过 同一个 socket 防止多线程赋值出现空值的问题
   isConnected=true;
   mClientSocket = socket;
   mTalkThread = new TalkThread();
   mTalkThread.start();

   // Do work to manage the connection (in a separate thread)
   // 多线程操作小心不安全性
   synchronized (BlueConnectService.this) {
   //close();
   }
  }

  }
 }

 public void close() {
  isRun = false;
  try {
  mmServerSocket.close();
  } catch (IOException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
  }
 }

}

/**
 *设计连接成功后的聊天线程 1.建立流,打通连接 2.发送和接收数据 3.显示数据
 *需要注意的是聊天的时候,需要同一个socket建立连接才能获取对应的输入输出流
 */

 private class TalkThread extends Thread {

 private final BluetoothSocket talkSocket;
 private final InputStream mIs;
 private final OutputStream mOs;
 private boolean isRunning = true;

 public TalkThread() {
  // TODO Auto-generated constructor stub
  talkSocket = mClientSocket;
  if (talkSocket == null) {
  System.out.println("================= talkThread erro ");
  // return;
  }

  InputStream is = null;
  OutputStream os = null;
  try {
  is = talkSocket.getInputStream();
  os = talkSocket.getOutputStream();
  } catch (IOException e) {
  // TODO Auto-generated catch block
  try {
   System.out.println("???????????????? close socket");
   talkSocket.close();
   CloseUtil.closeStream(is, os);
  } catch (IOException e1) {
   // TODO Auto-generated catch block
   e1.printStackTrace();
  }
  e.printStackTrace();
  }

  mIs = is;
  mOs = os;

 }

 @Override
 public void run() {
  // TODO Auto-generated method stub
  super.run();
  byte[] buffer = new byte[1024];
  int len;
  while (isRunning) {
  try {
   len = mIs.read(buffer);
   mHandler.obtainMessage(READ_MESSAGE, len, -1, buffer).sendToTarget();
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
   try {
   isRunning = false;
   isConnected=false;
   System.out.println("???????????????? close socket");
   talkSocket.close();
   // 需要重启服务器
   // 启动服务器

   } catch (IOException e1) {
   // TODO Auto-generated catch block
   e1.printStackTrace();
   }
   CloseUtil.closeStream(mIs, mOs);

  }
  }

 }

 public void write(byte[] bytes) {
  try {
  mOs.write(bytes);
  mHandler.obtainMessage(WRITE_MESSAGE, bytes.length, -1, bytes).sendToTarget();
  } catch (IOException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
  }
 }

}

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