android商户扫码枪读取手机二维码
扫码抢实现读取二维码信息,本地扫码枪是外接写入设备,本质是监控读写输入,下面介绍下扫码设备读取支付二维码。
1.引入扫码设备辅助类
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 ; mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); mStringBufferResult = new StringBuffer(); mHandler = new Handler(); mScanningFishedRunnable = new Runnable() { @Override public 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 */ @Deprecated public boolean isScanGunEvent(KeyEvent event) { return event.getDevice().getName().equals(mDeviceName); } }
2. active里面实现代理方法
//实现上述类接口‘ public class MainActivity extends AppCompatActivity implements ScanGunKeyEventHelper.OnScanSuccessListener //重写扫码枪识别返回数据 @Override public void onScanSuccess(String barcode) { barCode = barcode; if (barcode != null && recordPrice > 0 && payString.equals ("readyPay")) { payDishs(); } } //重写捕捉到扫码枪事件 @Override public boolean dispatchKeyEvent(KeyEvent event) { mScanGunKeyEventHelper.analysisKeyEvent(event); return true; }
dispatchKeyEvent里面分发事件一定设置 return true,否则扫码枪事件传递到屏幕其他按钮上
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