Android 设备蓝牙连接扫描枪获取扫描内容

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条形扫描枪主要可以扫描条形码和二维码等，扫描速度比手机扫描设备快得多，本文简单介绍android 通过蓝牙监听蓝牙连接，当扫描设备连接完成后，扫描设备相当于外接键盘，通过监听外接键盘输入事件，获取扫描出的内容。

其他参照文档:/czhpxl007/article/details/50363766

1.蓝牙配对

打开系统设置，蓝牙配对扫描枪， 一般扫描枪说明书都有写，配对完成后，显示已连接

2.AndroidManifest中配置权限

在中配置蓝牙连接所需要的权限

<!-- 蓝牙 --><uses-permission android:name="android.permission.BLUETOOTH" /><uses-permission android:name="android.permission.BLUETOOTH_ADMIN" /><uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /><uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

3.获取设备信息，判断是否连接

这里蓝牙设备返回的设备类型是BluetoothClass.Device.Major.PERIPHERAL

/*** 扫描枪是否连接* @return*/public boolean hasScanGun() {if (mBluetoothAdapter == null) {return false;}Set<BluetoothDevice> blueDevices = mBluetoothAdapter.getBondedDevices();if (blueDevices == null || blueDevices.size() <= 0) {return false;}for (Iterator<BluetoothDevice> iterator = blueDevices.iterator(); iterator.hasNext(); ) {BluetoothDevice bluetoothDevice = iterator.next();if (bluetoothDevice.getBluetoothClass().getMajorDeviceClass() == BluetoothClass.Device.Major.PERIPHERAL) {mDeviceName = bluetoothDevice.getName();return isInputDeviceExist(mDeviceName);}}return false;}/*** 输入设备是否存在* @param deviceName* @return*/private boolean isInputDeviceExist(String deviceName) {int[] deviceIds = InputDevice.getDeviceIds();for (int id : deviceIds) {if (InputDevice.getDevice(id).getName().equals(deviceName)) {return true;}}return false;}

4.构建扫描枪解析类ScanGunKeyEventHelper

使用扫描枪解析类需要在相关类中调用 analysisKeyEvent(KeyEvent event) ，传入监听事件，当解析相对应事件获得输入内容，通过OnScanSuccessListener 接口回调返回

/*** 扫码枪事件解析类 by chen*/public class ScanGunKeyEventHelper {private final static long MESSAGE_DELAY = 500;//延迟500ms，判断扫码是否完成。private StringBuffer mStringBufferResult;//扫码内容private boolean mCaps;//大小写区分private final Handler mHandler;private final BluetoothAdapter mBluetoothAdapter;private final Runnable mScanningFishedRunnable;private OnScanSuccessListener mOnScanSuccessListener;private String mDeviceName;public ScanGunKeyEventHelper(OnScanSuccessListener onScanSuccessListener) {mOnScanSuccessListener = onScanSuccessListener ;//获取系统蓝牙适配器管理类mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();// BluetoothDevice printerdevice = mBluetoothAdapter.getRemoteDevice("ssss");// BluetoothSocket btSocket = printerdevice.createRfcommSocketToServiceRecord("ssss");mStringBufferResult = new StringBuffer();mHandler = new Handler();mScanningFishedRunnable = new Runnable() {@Overridepublic void run() {performScanSuccess();}};}/*** 返回扫码成功后的结果*/private void performScanSuccess() {String barcode = mStringBufferResult.toString();if (mOnScanSuccessListener != null)mOnScanSuccessListener.onScanSuccess(barcode);mStringBufferResult.setLength(0);}/*** 扫码枪事件解析* @param event*/public void analysisKeyEvent(KeyEvent event) {int keyCode = event.getKeyCode();//字母大小写判断checkLetterStatus(event);if (event.getAction() == KeyEvent.ACTION_DOWN) {char aChar = getInputCode(event);;if (aChar != 0) {mStringBufferResult.append(aChar);}if (keyCode == KeyEvent.KEYCODE_ENTER) {//若为回车键，直接返回mHandler.removeCallbacks(mScanningFishedRunnable);mHandler.post(mScanningFishedRunnable);} else {//延迟post，若500ms内，有其他事件mHandler.removeCallbacks(mScanningFishedRunnable);mHandler.postDelayed(mScanningFishedRunnable, MESSAGE_DELAY);}}}//检查shift键private void checkLetterStatus(KeyEvent event) {int keyCode = event.getKeyCode();if (keyCode == KeyEvent.KEYCODE_SHIFT_RIGHT || keyCode == KeyEvent.KEYCODE_SHIFT_LEFT) {if (event.getAction() == KeyEvent.ACTION_DOWN) {//按着shift键，表示大写mCaps = true;} else {//松开shift键，表示小写mCaps = false;}}}//获取扫描内容private char getInputCode(KeyEvent event) {int keyCode = event.getKeyCode();char aChar;if (keyCode >= KeyEvent.KEYCODE_A && keyCode <= KeyEvent.KEYCODE_Z) {//字母aChar = (char) ((mCaps ? 'A' : 'a') + keyCode - KeyEvent.KEYCODE_A);} else if (keyCode >= KeyEvent.KEYCODE_0 && keyCode <= KeyEvent.KEYCODE_9) {//数字aChar = (char) ('0' + keyCode - KeyEvent.KEYCODE_0);} else {//其他符号switch (keyCode) {case KeyEvent.KEYCODE_PERIOD:aChar = '.';break;case KeyEvent.KEYCODE_MINUS:aChar = mCaps ? '_' : '-';break;case KeyEvent.KEYCODE_SLASH:aChar = '/';break;case KeyEvent.KEYCODE_BACKSLASH:aChar = mCaps ? '|' : '\\';break;default:aChar = 0;break;}}return aChar;}public interface OnScanSuccessListener {void onScanSuccess(String barcode);}public void onDestroy() {mHandler.removeCallbacks(mScanningFishedRunnable);mOnScanSuccessListener = null;}//部分手机如三星，无法使用该方法// private void hasScanGun() {// Configuration cfg = getResources().getConfiguration();// return cfg.keyboard != Configuration.KEYBOARD_NOKEYS;// }/*** 扫描枪是否连接* @return*/public boolean hasScanGun() {if (mBluetoothAdapter == null) {return false;}Set<BluetoothDevice> blueDevices = mBluetoothAdapter.getBondedDevices();if (blueDevices == null || blueDevices.size() <= 0) {return false;}for (Iterator<BluetoothDevice> iterator = blueDevices.iterator(); iterator.hasNext(); ) {BluetoothDevice bluetoothDevice = iterator.next();if (bluetoothDevice.getBluetoothClass().getMajorDeviceClass() == BluetoothClass.Device.Major.PERIPHERAL) {mDeviceName = bluetoothDevice.getName();return isInputDeviceExist(mDeviceName);}}return false;}/*** 输入设备是否存在* @param deviceName* @return*/private boolean isInputDeviceExist(String deviceName) {int[] deviceIds = InputDevice.getDeviceIds();for (int id : deviceIds) {if (InputDevice.getDevice(id).getName().equals(deviceName)) {return true;}}return false;}/*** 是否为扫码枪事件(部分机型KeyEvent获取的名字错误)* @param event* @return*/@Deprecatedpublic boolean isScanGunEvent(KeyEvent event) {return event.getDevice().getName().equals(mDeviceName);}/*** 检测蓝牙是否开启*/public int checkBluetoothValid() {if(mBluetoothAdapter == null) {//你的设备不具备蓝牙功能!return 1;}if(!mBluetoothAdapter.isEnabled()) {//蓝牙设备未打开,请开启此功能后重试!return 2;}return 3;//蓝牙正常工作}}

5.在Activity中使用解析类ScanGunKeyEventHelper

Activity中重写dispatchKeyEvent方法，截取Key事件。

/*** 截获按键事件.发给ScanGunKeyEventHelper** @param event* @return*/@Overridepublic boolean dispatchKeyEvent(KeyEvent event) {if (mScanGunKeyEventHelper.isScanGunEvent(event)) {mScanGunKeyEventHelper.analysisKeyEvent(event);return true;}return super.dispatchKeyEvent(event);}

获取扫描结果回调,详细代码请查看TestScanner

/*** @author Wu JianCheng* @date on /12/18 14:44* 测试蓝牙连接扫描枪功能*/public class BleAct extends Activity implements ScanGunKeyEventHelper.OnScanSuccessListener {.../*** 扫描结果回调* @param barcode*/@Overridepublic void onScanSuccess(String barcode) {showToast(barcode);}...}