android蓝牙通信

 

一 蓝牙开启

首先需要获取系统的蓝牙适配器，如果适配器不为空且没有开启的话，通过intent进行开启操作，相关代码如下：

BluetoothAdapter blueadapter = BluetoothAdapter.getDefaultAdapter(); if (blueadapter != null) {  //Device support Bluetooth     //确认开启蓝牙     if (!blueadapter.isEnabled()) {         //请求用户开启         Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);         startActivityForResult(intent, RESULT_FIRST_USER);         //使蓝牙设备可见，方便配对         Intent in = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);         in.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 200);         startActivity(in);         //直接开启，不经过提示    //     blueadapter.enable();     } }

 

二   设备搜索

主动发起搜索：

blueadapter.startDiscovery()

获取配对过的蓝牙设备：

Set<BluetoothDevice> device = blueadapter.getBondedDevices(); data.clear(); if (blueadapter != null && blueadapter.isDiscovering()) {     adapter.notifyDataSetChanged(); } if (device.size() > 0) { //存在已经配对过的蓝牙设备     for (Iterator<BluetoothDevice> it = device.iterator(); it.hasNext(); ) {         BluetoothDevice btd = it.next();         blueadapter.getProfileConnectionState(BluetoothProfile.A2DP);         data.add(btd);     } } else {  //不存在已经配对过的蓝牙设备 }

需要注意的是服务端的蓝牙设备类型要与BluetoothProfile.A2DP统一

三  状态监听

首先先注册广播：

IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND); filter.addAction(ACTION_STATE_CHANGED); filter.addAction(ACTION_DISCOVERY_FINISHED); registerReceiver(receiver, filter);

编写广播类：

private DeviceReceiver receiver = new DeviceReceiver(); private class DeviceReceiver extends BroadcastReceiver {     @Override     public void onReceive(Context context, Intent intent) {         String action = intent.getAction();         Logd("-----------DeviceReceiver:"+action);         if (BluetoothDevice.ACTION_FOUND.equals(action)) {    //搜索到新设备            // data.clear();             BluetoothDevice btd = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);             //搜索没有配过对的蓝牙设备             if (btd.getBondState() != BluetoothDevice.BOND_BONDED) {                 data.add(btd);                 adapter.notifyDataSetChanged();             }         } else if (ACTION_DISCOVERY_FINISHED.equals(action)) {   //搜索结束             if (binding.listview.getCount() == 0) {                 adapter.notifyDataSetChanged();             }         }         else if (action.equals(ACTION_STATE_CHANGED)) {             int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE,                     BluetoothAdapter.ERROR);             switch (state) {                 case BluetoothAdapter.STATE_OFF:                     Log.d("aaa", "STATE_OFF 手机蓝牙关闭");                     binding.tvState.setText(R.string.tip_bluetooth_close);                     break;                 case BluetoothAdapter.STATE_TURNING_OFF:                     Log.d("aaa", "STATE_TURNING_OFF 手机蓝牙正在关闭");                     break;                 case BluetoothAdapter.STATE_ON:                     Log.d("aaa", "STATE_ON 手机蓝牙开启");                     binding.tvState.setText(R.string.tip_bluetooth_open);                     search(null);                     break;                 case BluetoothAdapter.STATE_TURNING_ON:                     Log.d("aaa", "STATE_TURNING_ON 手机蓝牙正在开启");                     findAvalibleDevice();                     break;             }         }     } }

 

四  蓝牙通信

服务端

蓝牙Server端就是通过线程来注册一个具有名称和唯一识别的UUID号的BluetoothServerSocket, 然后就一直监听Client端(BluetoothSocket)的请求，并对这些请求做出相应的处理。

// 注册蓝牙Server

    /* 创建一个蓝牙服务器      * 参数分别：服务器名称、UUID   */ mserverSocket = mBluetoothAdapter.listenUsingRfcommWithServiceRecord(PROTOCOL_SCHEME_RFCOMM,         UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"));

 

参数PROTOCOL_SCHEME_RFCOMM是一个String类型的常量，表示蓝牙Server的名称，而UUID.fromString()表示蓝牙Server的唯一标识UUID。

在Client连接到Server时需要使用该UUID号。

// 接收Client的连接请求

socket = mserverSocket.accept();

// 处理接收内容

//读取数据 private class readThread extends Thread {     @Override     public void run() {         byte[] buffer = new byte[1024];         int bytes;         InputStream mmInStream = null;         try {             mmInStream = socket.getInputStream();         } catch (IOException e1) {             // TODO Auto-generated catch block             e1.printStackTrace();         }         while (true) {             try {                 // Read from the InputStream                 if( (bytes = mmInStream.read(buffer)) > 0 )                 {                     byte[] buf_data = new byte[bytes];                     for(int i=0; i<bytes; i++)                     {                         buf_data[i] = buffer[i];                     }                     String s = new String(buf_data);                     Message msg = new Message();                     msg.obj = s;                     msg.what = 1;                     LinkDetectedHandler.sendMessage(msg);                 }             } catch (IOException e) {                 try {                     mmInStream.close();                 } catch (IOException e1) {                     // TODO Auto-generated catch block                     e1.printStackTrace();                 }                 break;             }         }     } }

 

客户端

客户端连接时需要知道服务端的UUID号，代码如下：

socket = device.createRfcommSocketToServiceRecord(UUID.fromString("00001101-0000-1000-8000-00805F9B34FB")); socket.connect();

发送数据

if (socket == null) {     Toast.makeText(mContext, "没有连接", Toast.LENGTH_SHORT).show();     return; } try {     OutputStream os = socket.getOutputStream();     os.write(msg.getBytes()); } catch (IOException e) {     e.printStackTrace(); }