android 蓝牙SPP协议通信

登山则情满于山，观海则意溢于海。这篇文章主要讲述android 蓝牙SPP协议通信相关的知识，希望能为你提供帮助。
准备1.蓝牙串行端口基于SPP协议（Serial Port Profile），能在蓝牙设备之间创建串口进行数据传输
2.SPP的UUID：00001101-0000-1000-8000-00805F9B34FB
3.android手机一般以客户端的角色主动连接SPP协议设备
连接流程1.检测蓝牙状态
若蓝牙未打开，则打开蓝牙~

bluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); @Override protected void onResume() { super.onResume(); if (!bluetoothAdapter.isEnabled()) { // open blueTooth Intent enableBtIntent = new Intent( BluetoothAdapter.ACTION_REQUEST_ENABLE); startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT); } }@Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (requestCode == REQUEST_ENABLE_BT & & resultCode == Activity.RESULT_CANCELED) { finish(); return; } }

2.注册设备搜索广播信息
使用registerReceiver注册broadcastReceiver来获取搜索设备等消息

IntentFilter intentFilter = new IntentFilter(); intentFilter.addAction(BluetoothDevice.ACTION_FOUND); intentFilter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED); registerReceiver(receiver, intentFilter); // receiver private final BroadcastReceiver receiver = new BroadcastReceiver(){ @Override public void onReceive(Context context, Intent intent) { String action = intent.getAction(); if (BluetoothDevice.ACTION_FOUND.equals(action)) { // find a device BluetoothDevice device = intent .getParcelableExtra(BluetoothDevice.EXTRA_DEVICE); if (device.getBondState() != BluetoothDevice.BOND_BONDED) { //未配对设备 newDeviceArrayAdapter.add(device.getName() + "\n" + device.getAddress()); }else { //已经配对过的设备 TextView tvPaired = (TextView)findViewById(R.id.tv_paired); tvPaired.setVisibility(View.VISIBLE); lvPairedDevices.setVisibility(View.VISIBLE); pairedDeviceArrayAdapter.add(device.getName() + "\n" + device.getAddress()); } Log.i(TAG,"name:" + device.getName() + " address"+ device.getAddress()); } else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action){ // search finish Log.i(TAG, "search finish!"); } } };

3.使用BlueAdatper搜索
使用bluetoothAdapter搜索设备，bluetoothAdapter.startDiscovery()在搜索过程中，系统会发出三个广播信息:
ACTION_DISCOVERY_START：开始搜索
ACTION_DISCOVERY_FINISHED：搜索结束
ACTION_FOUND：找到设备

@Override public void onClick(View v) { if (bluetoothAdapter.isDiscovering()) { bluetoothAdapter.cancelDiscovery(); } bluetoothAdapter.startDiscovery(); }

4.获取搜索到的蓝牙设备信息
在BroadcastReceiver的onReceive()里取得搜索到的蓝牙设备信息(如名称，MAC，RSSI)
5.通过蓝牙设备的MAC地址来建立一个BluetoothDevice对象：

BluetoothDevice romoteDevice = bluetoothAdapter.getRemoteDevice(mDeviceAddress);

6.由BluetoothDevice衍生BluetoothSocket
通过BluetoothSocket的createRfcommSocketToServiceRecord()方法来选择连接的协议/服务，这里用的是SPP(UUID:00001101-0000-1000-8000-00805F9B34FB)

try { bluetoothSocket = romoteDevice.createRfcommSocketToServiceRecord(UUID.fromString(SPP_UUID)); } catch (IOException e) { e.printStackTrace(); Toast.makeText(this, "socket init failed", Toast.LENGTH_SHORT).show(); }

7.使用BluetoothSocket来连接、读写蓝牙设备
读写可以归到一个独立线程去实现~

try { bluetoothSocket.connect(); Toast.makeText(this, "connect success", Toast.LENGTH_SHORT).show(); } catch (IOException e2) { e2.printStackTrace(); Toast.makeText(this, "connect failed", Toast.LENGTH_SHORT).show(); try { bluetoothSocket.close(); bluetoothSocket = null; } catch (IOException e) { e.printStackTrace(); Toast.makeText(this, "socket close failed", Toast.LENGTH_SHORT).show(); } return; }try { inputStream = bluetoothSocket.getInputStream(); } catch (IOException e2) { e2.printStackTrace(); Toast.makeText(this, "get inputstream failed", Toast.LENGTH_SHORT).show(); return; }try { OutputStream os = bluetoothSocket.getOutputStream(); byte[] osBytes = etInput.getText().toString().getBytes(); for (int i = 0; i < osBytes.length; i++) { if (osBytes[i] == 0x0a) n++; } byte[] osBytesNew = new byte[osBytes.length+n]; n = 0; for (int i = 0; i < osBytesNew.length; i++) { //mobile "\n"is 0a,modify 0d 0a then send if (osBytesNew[i] == 0x0a) { osBytesNew[n] = 0x0d; n++; osBytesNew[n] = 0x0a; }else { osBytesNew[n] = osBytes[i]; } n++; } os.write(osBytesNew); } catch (Exception e) { e.printStackTrace(); }

【android 蓝牙SPP协议通信】