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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