先看下结构目录
- ChatService.java —— 蓝牙连接
- DeviceList.java —— 设备显示
- MainActivity.java—— 主界面
1.权限
要获取蓝牙功能，先在AndroidManifest.xml中申请权限
<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
2.界面
先从比较直观的地方 弹 起吧。
主聊天界面：Listview显示对话，EditText编辑消息，Button发送消息
设备列表：2*ListView分别显示已配对和搜索到的设备。Button按钮开始查找。
下面讲讲如何实现其功能
3.代码
挑几个关键的地方，其它细节就不一一赘述了。
3.1 DeviceList —— 蓝牙搜索设备功能
蓝牙搜索主要是要实现一个BroadcastReceiver 广播接收者。
首先要注册广播，才能使用，添加蓝牙设备ACTION_FOUND等，如下
private IntentFilter filter = new IntentFilter();
…………………………………………………
filter.addAction(BluetoothDevice.ACTION_FOUND);
filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
this.registerReceiver(mReceiver,filter);其次就是这里广播接收
一旦开启广播搜索，并找到设备 接收到ACTION_FOUND的信息，则可以从BluetoothDevice.EXTRA_DEVICE中得到搜索到的设备信息，显示到屏幕上。
如果是DISCOVERY_FINISHED，即结束搜索。 下方代码为看起来方便，省略了一些不必要的。
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
@Override public void onReceive(Context context, Intent intent) {
String action=intent.getAction();
if(BluetoothDevice.ACTION_FOUND.equals(action)){
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE); // 得到设备信息
}else if(BluetoothAdapter.ACTION_DISCOVERY_FINISHED
.equals(action)){ //结束搜索了 }
}
}
};3.2 ChatService —— 蓝牙连接功能
通过3个线程来实现。
3.2.1 AcceptThread —— 被动等待连接的线程
使用BluetoothServerSocket accept函数，收到连接，则保持此连接传给 ConnectedThread
// 创建监听线程，准备接受新连接。使用阻塞方式，调用BluetoothServerSocket.accept()
private class AcceptThread extends Thread{
private final BluetoothServerSocket mmServerSocket;
public AcceptThread(){
BluetoothServerSocket tmp = null;
try{
tmp = mAdapter.listenUsingRfcommWithServiceRecord(NAME,MY_UUID);
}catch (IOException e){}
mmServerSocket = tmp;
}
public void run(){
BluetoothSocket socket= null;
while(mState != STATE_CONNECTED){
try{
socket = mmServerSocket.accept();
}catch (IOException e) {
break;
}
if(socket != null){
connected(socket,socket.getRemoteDevice());
try{
mmServerSocket.close();
}catch (IOException e){}
}
}
}
public void cancel(){
try{
mmServerSocket.close();
}catch (IOException e){}
}
}3.2.1 ConnectThread —— 主动发起连接的线程
createRfcommSocketToServiceRecord 根据UUID 发起连接，连接成功则将连接传入ConnectedThread
// 连接线程，专门用来对外发出连接对方蓝牙的请求并进行处理
// 构造函数里通过BluetoothDevice.createRfcommSocketToServiceRecord(),
// 从待连接的device产生BluetoothSocket，然后在run方法中connect
// 成功后调用 BluetoothChatService的connnected（）方法，定义cancel（）在关闭线程时能关闭socket
private class ConnectThread extends Thread{
private final BluetoothSocket mmSocket;
private final BluetoothDevice mmDevice;
public ConnectThread(BluetoothDevice device){
// Use a temporary object that is later assigned to mmSocket,
// because mmSocket is final
mmDevice=device;
BluetoothSocket tmp = null;
// Get a BluetoothSocket to connect with the given BluetoothDevice
try{
// MY_UUID is the app's UUID string, also used by the server code
tmp = device.createRfcommSocketToServiceRecord(MY_UUID);
}catch (IOException e){}
mmSocket = tmp;
}
public void run(){
// Cancel discovery because it will slow down the connection
mAdapter.cancelDiscovery();
try{
// Connect the device through the socket. This will block
// until it succeeds or throws an exception
mmSocket.connect();
}catch (IOException e){
connectionFailed();
// Unable to connect; close the socket and get out
try{
mmSocket.close();
}catch (IOException e2){}
//ChatService.this.start();
return;
}
synchronized(ChatService.this){
mConnectedThread = null;
}
connected(mmSocket,mmDevice);
}
public void cancel(){
/* try{
mmSocket.close();
}catch (IOException e){}*/
}
}3.2.1 ConnectedThread —— 管理连接的线程
管理连接好的双方，进行数据通信。输入输出流，接收数据，发送数据
// 双方蓝牙连接后一直运行的线程。构造函数中设置输入输出流。
// Run方法中使用阻塞模式的InputStream.read()循环读取输入流
// 然后psot到UI线程中更新聊天信息。也提供了write()将聊天消息写入输出流传输至对方，
// 传输成功后回写入UI线程。最后cancel()关闭连接的socket
private class ConnectedThread extends Thread{
private final BluetoothSocket mmSocket;
private final InputStream mmInStream;
private final OutputStream mmOutStream;
public ConnectedThread(BluetoothSocket socket){
mmSocket = socket;
InputStream tmpIn = null;
OutputStream tmpOut=null;
// Get the input and output streams, using temp objects because
// member streams are final
try{
tmpIn=mmSocket.getInputStream();
tmpOut=mmSocket.getOutputStream();
}catch (IOException e){}
mmInStream = tmpIn;
mmOutStream = tmpOut;
}
public void run(){
byte[]buffer=new byte[1024];
int bytes;
while (true){
try{
bytes = mmInStream.read(buffer);
mHandler.obtainMessage(MainActivity.MESSAGE_READ,bytes,-1,buffer).sendToTarget();
}catch (IOException e){
connectionLost();
break;
}
}
}
public void write(byte[]buffer){
try{
mmOutStream.write(buffer);
}catch (IOException e){
Log.d("MainActivity","Send Fail");
}
mHandler.obtainMessage(MainActivity.MESSAGE_WRITE,buffer).sendToTarget();
}
public void cancel(){
try{
mmSocket.close();
}catch (IOException e){}
}
}
3.3 MainActivity—— 主聊天界面
主要是将双方信息显示在上方，listview的操作，就不讲了。
最后，源码地址奉上：https://github.com/Zweo/Bluetooth