android蓝牙学习 _android

愿君学长松，慎勿作桃李。这篇文章主要讲述android蓝牙学习相关的知识，希望能为你提供帮助。
学习路线
1 蓝牙权限

< uses-permission android:name="android.permission.BLUETOOTH" /> < uses-permission android:name="android.permission.BLUETOOTH_ADMIN" /> < uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/> //安卓6.0版本需要位置权限

2 打开蓝牙

public void onOpen(View v) { bluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); //获取蓝牙适配器if (!bluetoothAdapter.isEnabled()) {//如果蓝牙是关闭的，则打开 bluetoothAdapter.enable(); showMessage("Open bluetooth"); } else { showMessage("Bluetooth is already open"); } }

【android蓝牙学习】

3 扫描周围蓝牙（获取配对蓝牙）
扫描周围的蓝牙需要定义一个广播接收器

private BroadcastReceiver mReceiver=new BroadcastReceiver(){ @Override public void onReceive(Context context, Intent intent) { String action=intent.getAction(); Log.i("boye", action); if(action.equals(BluetoothDevice.ACTION_FOUND)) { BluetoothDevice device=intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE); //获取当前扫描到的设备if(device.getBondState()==BluetoothDevice.BOND_BONDED) {//显示已配对设备 textView.append("\n"+device.getName()+"==> "+device.getAddress()+"\n"); Toast.makeText(context, "发现已配对设备:" + device.getName(), Toast.LENGTH_LONG).show(); } else if(device.getBondState()!=BluetoothDevice.BOND_BONDED) { textView3.append("\n"+device.getName()+"==> "+device.getAddress()+"\n"); Toast.makeText(context, "发现未配对设备:" + device.getName(), Toast.LENGTH_LONG).show(); } } else if(action.equals(BluetoothAdapter.ACTION_DISCOVERY_FINISHED)){ textView2.setText("搜索完成..."); } } };

广播过滤器

IntentFilter filter=new IntentFilter(BluetoothDevice.ACTION_FOUND); //过滤出发现 registerReceiver(mReceiver,filter); //注册广播 IntentFilter filter2=new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED); //过滤出扫描结束 registerReceiver(mReceiver,filter2); //注册广播

4 蓝牙配对

public void createBond(BluetoothDevice btDev, Handler handler) { if (btDev.getBondState() == BluetoothDevice.BOND_NONE) { //如果这个设备取消了配对，则尝试配对 if (Build.VERSION.SDK_INT > = Build.VERSION_CODES.KITKAT) { //安卓版本大于等于4.3 btDev.createBond(); } } else if (btDev.getBondState() == BluetoothDevice.BOND_BONDED) { //如果这个设备已经配对完成，则尝试连接 connect(btDev, handler); } }

5 蓝牙的连接

private void connect(BluetoothDevice btDev, Handler handler) { try { //通过和服务器协商的uuid来进行连接 mBluetoothSocket = btDev.createRfcommSocketToServiceRecord(BltContant.SPP_UUID); if (mBluetoothSocket != null) //全局只有一个bluetooth，所以我们可以将这个socket对象保存在appliaction中 BltAppliaction.bluetoothSocket = mBluetoothSocket; Log.i("blueTooth", "开始连接..."); //在建立之前调用 if (getmBluetoothAdapter().isDiscovering()) //停止搜索 getmBluetoothAdapter().cancelDiscovery(); //如果当前socket处于非连接状态则调用连接 if (!getmBluetoothSocket().isConnected()) { //你应当确保在调用connect()时设备没有执行搜索设备的操作。 // 如果搜索设备也在同时进行，那么将会显著地降低连接速率，并很大程度上会连接失败。 getmBluetoothSocket().connect(); } Log.i("blueTooth", "已经连接"); if (handler == null) return; //结果回调 Message message = new Message(); message.what = 4; message.obj = btDev; handler.sendMessage(message); } catch (Exception e) { Log.i("blueTooth", "...连接失败"); try { getmBluetoothSocket().close(); } catch (IOException e1) { e1.printStackTrace(); } e.printStackTrace(); } }

6 蓝牙通信
（1）发送消息

public static void sendMessage(String message) { if (BltAppliaction.bluetoothSocket == null || TextUtils.isEmpty(message)) return; try { //message += "\n"; OutputStream outputStream = BltAppliaction.bluetoothSocket.getOutputStream(); outputStream.write(message.getBytes("utf-8")); outputStream.flush(); } catch (IOException e) { e.printStackTrace(); } }}

（2）接收消息

public static void receiveMessage(Handler handler) { if (BltAppliaction.bluetoothSocket == null || handler == null) return; try { InputStream inputStream = BltAppliaction.bluetoothSocket.getInputStream(); byte[] buffer = new byte[200]; inputStream.read(buffer); Log.i("boye收到的信息",new String(buffer)); Message message = new Message(); message.obj = new String(buffer); message.what = 1; handler.sendMessage(message); } catch (IOException e) { e.printStackTrace(); } }