AndroidStudio_android蓝牙开发总结_连接硬件设备_测量_血压

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关于硬件设备的蓝牙连接一般都有给的demo,一般情况下按照demo去写就可以了,但是实际情况下,

有时候,实际应用,要比demo要复杂一些,比如设备使用过程中,直接就断开,断电等异常情况比较多.

我看网上处理蓝牙操作,有主动连接硬件设备的,这样的连接方式应该稳定一些,因为我这边用,蓝牙扫描的方式,实现了

所以我就没有再去改代码,看了一下网上的代码,也没有太难,记录一下自己的实现方式,以后可以复制粘贴使用.

实现方式:蓝牙要先开启,然后,程序去扫描附近蓝牙设备,如果找到的蓝牙设备中,发现有和自己提前设置的mac地址

一样的就主动去连接这个设备,就相当于找到这个设备了,然后就可以去操作设备了.

android中使用蓝牙的时候,需要引入蓝牙使用权限:

 需要在AndroidManifest.xml 文件中添加蓝牙权限 <!--蓝牙权限--> <uses-permission android:name="android.permission.BLUETOOTH" /> <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />

然后,如果对接的硬件,还需要其他权限,会有说明文档,也需要添加上

然后需要定义些,蓝牙需要的变量

0.定义蓝牙相关变量

 private String mac_address=""; private BluetoothAdapter bluetoothAdapter; private BluetoothGatt mBluetoothGatt; private BluetoothGattService bluetoothGattService; private BluetoothGattCharacteristic writeCharacteristic; private BluetoothGattCharacteristic notifyCharacteristic; private ReentrantLock commLock =new ReentrantLock(); private BluetoothDevice currentDevice;

1.然后,去初始化蓝牙,这个在onCreate方法中调用,就可以了.

 private void lk_xyj_initBloodPressure() { bluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); if (bluetoothAdapter == null) { Toast.makeText(this, "说明此设备不支持蓝牙操作", Toast.LENGTH_LONG).show(); return; } }

2.然后再去,搜索设备

 //1.搜索乐康血压计 private void lk_xyj_searchDevice() { // 注册Receiver来获取蓝牙设备相关的结果 IntentFilter intent = new IntentFilter("android.bluetooth.device.action.UUID"); intent.addAction(BluetoothDevice.ACTION_FOUND); // 用BroadcastReceiver来取得搜索结果 intent.addAction(BluetoothDevice.EXTRA_UUID); intent.addAction(BluetoothDevice.ACTION_UUID); intent.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED); intent.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED); intent.addAction(BluetoothA2dp.ACTION_CONNECTION_STATE_CHANGED); intent.addAction(BluetoothAdapter.ACTION_STATE_CHANGED); registerReceiver(lk_xyj_searchDevices, intent); bluetoothAdapter.startDiscovery(); BaseApplication.context().showDialog(FaceBodyCheckActivity.this, "正在连接设备..."); }

可以看到上面,注册了一个广播接收器,来接收蓝牙的信息

注册完蓝牙广播接收器,以后然后bluetoothAdapter,startDiscovery() 这个是开启蓝牙扫描

3.然后看到蓝牙扫描中

 //2.乐康血压计搜索,广播类 private BroadcastReceiver lk_xyj_searchDevices = new BroadcastReceiver() { public void onReceive(Context context, Intent intent) { String action = intent.getAction(); if (action.equals(BluetoothDevice.ACTION_FOUND)) { //found device currentDevice = intent .getParcelableExtra(BluetoothDevice.EXTRA_DEVICE); // BluetoothDevice device = intent // .getParcelableExtra(BluetoothDevice.EXTRA_DEVICE); if (mac_address.equals(currentDevice.getAddress())) { bluetoothAdapter.cancelDiscovery(); mBluetoothGatt = currentDevice.connectGatt(FaceBodyCheckActivity.this, false, lk_xyj_GattCallback); } } else if (BluetoothDevice.ACTION_UUID.equals(action)) { currentDevice = intent .getParcelableExtra(BluetoothDevice.EXTRA_DEVICE); // BluetoothDevice device = intent // .getParcelableExtra(BluetoothDevice.EXTRA_DEVICE); if (mac_address.equals(currentDevice.getAddress())) { bluetoothAdapter.cancelDiscovery(); mBluetoothGatt = currentDevice.connectGatt(FaceBodyCheckActivity.this, false, lk_xyj_GattCallback); } } } }; 

这个方法,是只要收到蓝牙的广播信息就走这个方法,并且,会把当前扫描的蓝牙设备赋值给currentDevice 然后获取currentDevice的mac地址

然后判断这个扫描到的设备的mac和我们要连接的设备的mac是否一样,如果一样,就取消bluetoothAdapter.cancelDiscovery() 取消蓝牙继续扫描

然后,去连接这个设备currentDevice.connectGatt(FaceBodyCheckActivity.this,false,lk_xyj_GattCallback);

这个是去连接,扫描到的这个蓝牙设备,连接以后,去回调,lk_xyj_GattCallback这个对象.

4.然后连接设备以后的回调

 //3.乐康血压计,handler类 Handler lk_xyj_mainHandler = new Handler(); private BluetoothGattCallback lk_xyj_GattCallback = new BluetoothGattCallback() { // 这里有9个要实现的方法，看情况要实现那些，用到那些就实现那些 //当连接状态发生改变的时候 @Override public void onConnectionStateChange(BluetoothGatt gatt, int status, final int newState) { mBluetoothGatt.discoverServices(); lk_xyj_mainHandler.post(new Runnable() { @Override public void run() { if (newState == BluetoothProfile.STATE_CONNECTED) { BaseApplication.context().closeDialog(); ToastUtils.toast(FaceBodyCheckActivity.this,"设备启动成功"); } else { Toast.makeText(FaceBodyCheckActivity.this, "设备连接已断开", Toast.LENGTH_SHORT).show(); } } }); }; //回调响应特征写操作的结果。 @Override public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) { System.out.println(); } ; //回调响应特征读操作的结果。 @Override public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) { System.out.println(); } //当服务被发现的时候回调的结果 @Override public void onServicesDiscovered(BluetoothGatt gatt, int status) { try { //设置serviceUUID,原型是：BluetoothGattService bluetoothGattService = bluetoothGatt.getService(UUID.fromString(SERVICESUUID)); bluetoothGattService = mBluetoothGatt.getService(UUID.fromString(DeviceFinal.LK_XYJ_SERVICESUUID)); //设置写入特征UUID,原型是：BluetoothGattCharacteristic writeCharacteristic = bluetoothGattService.getCharacteristic(UUID.fromString(WRITEUUID)); writeCharacteristic = bluetoothGattService.getCharacteristic(UUID.fromString(DeviceFinal.LK_XYJ_WRITEUUID)); //设置监听特征UUID,原型是：BluetoothGattCharacteristic notifyCharacteristic = bluetoothGattService.getCharacteristic(UUID.fromString(NOTIFYUUID)); notifyCharacteristic = bluetoothGattService.getCharacteristic(UUID.fromString(DeviceFinal.LK_XYJ_NOTIFYUUID)); //开启监听 boolean re = gatt.setCharacteristicNotification(notifyCharacteristic, true); System.out.println(re); } catch (Exception e) { e.printStackTrace(); lk_xyj_mainHandler.post(new Runnable() { @Override public void run() { ToastUtils.toast(FaceBodyCheckActivity.this,"所选设备不是血压计，请确认后再试！"); // xyj_start.setVisibility(View.GONE); // xyj_sub.setVisibility(View.GONE); // lk_xyj_msg.setText("所选设备不是血压计，请确认后再试！"); } }); } } //接受数据回调 @Override public void onCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic) { byte[] value = characteristic.getValue(); final String str = lk_xyj_bytesToHex(value); System.out.println(lk_xyj_bytesToHex(value)); lk_xyj_mainHandler.post(new Runnable() { @Override public void run() { if (str.indexOf("0240dd0200") != -1) { BigInteger amount = new BigInteger(String.valueOf(str.charAt(10)) + String.valueOf(str.charAt(11)), 16); // lk_xyj_msg.setText(amount + ""); lk_xyj_subTempData(amount.intValue()); } else if (str.indexOf("0240dd0c") != -1) { String sb = String.valueOf(str.charAt(12)) + String.valueOf(str.charAt(13)); String db = String.valueOf(str.charAt(16)) + String.valueOf(str.charAt(17)); String pr = String.valueOf(str.charAt(24)) + String.valueOf(str.charAt(25)); BigInteger SBPvalue = new BigInteger(sb, 16); BigInteger DBPvalue = new BigInteger(db, 16); BigInteger PRPvalue = new BigInteger(pr, 16); if (!sb.equals("ff")) { lk_xyj_spvalue=SBPvalue + ""; lk_xyj_dpvalue=DBPvalue + ""; lk_xyj_prvalue=PRPvalue + ""; // lk_xyj_sp.setText(SBPvalue + ""); // lk_xyj_dp.setText(DBPvalue + ""); // lk_xyj_pr.setText(PRPvalue + ""); //xyj_sub.setVisibility(View.VISIBLE); //发送血压数据 lk_xyj_subData(); } else { String err = String.valueOf(str.charAt(24)) + String.valueOf(str.charAt(25)); String errStr = ""; switch (new BigInteger(err, 16).intValue()) { case 1: errStr = "传感器震荡异常"; break; case 2: errStr = "检测不到足够的心跳或算不出血压"; break; case 3: errStr = "测量结果异常"; break; case 4: errStr = "袖带过松或漏气(10 秒内加压不到 30mmHg)"; break; case 5: errStr = "气管被堵住"; break; case 6: errStr = "测量时压力波动大"; break; case 7: errStr = "压力超过上限"; break; case 8: errStr = "标定数据异常或未标定"; break; default: errStr = "血压计异常"; } Toast.makeText(FaceBodyCheckActivity.this, errStr, Toast.LENGTH_LONG).show(); Toast.makeText(FaceBodyCheckActivity.this, "请重新测量", Toast.LENGTH_LONG).show(); // lk_xyj_msg.setText(errStr); } } } }); // System.out.println("ReceiveSuccess" + new BytesHexStrTranslate().bytesToHexFun1(value)); } //当连接能被被读的操作 @Override public void onDescriptorRead(BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status) { super.onDescriptorRead(gatt, descriptor, status); System.out.println(); } };

可以看到上面回调函数就可以判断设备连接成功还是连接失败.

并且连接成功以后,如果收到蓝牙的测量数据会回调对应的方法.