Android设备蓝牙连接扫描枪获取扫描内容 Android设备蓝牙连接扫描枪获取

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：Android设备获取扫码枪扫描内容
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

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 blueDevices = mBluetoothAdapter.getBondedDevices(); if (blueDevices == null || blueDevices.size() <= 0) {return false; }for (Iterator 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 blueDevices = mBluetoothAdapter.getBondedDevices(); if (blueDevices == null || blueDevices.size() <= 0) {return false; }for (Iterator 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 【Android设备蓝牙连接扫描枪获取扫描内容】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 on2018/12/18 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); }...}

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