Android設備藍牙連接掃描槍獲取掃描內容
條形掃描槍主要可以掃描條形碼和二維碼等,掃描速度比手機掃描設備快得多,本文簡單介紹android 通過藍牙監(jiān)聽藍牙連接,當掃描設備連接完成后,掃描設備相當于外接鍵盤,通過監(jiān)聽外接鍵盤輸入事件,獲取掃描出的內容。
其他參照文檔:Android設備獲取掃碼槍掃描內容
1.藍牙配對
打開系統(tǒng)設置,藍牙配對掃描槍, 一般掃描槍說明書都有寫,配對完成后,顯示已連接
2.AndroidManifest中配置權限
在中配置藍牙連接所需要的權限
<!-- 藍牙 --> <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.獲取設備信息,判斷是否連接
這里藍牙設備返回的設備類型是BluetoothClass.Device.Major.PERIPHERAL
/** * 掃描槍是否連接 * @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; } /** * 輸入設備是否存在 * @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.構建掃描槍解析類ScanGunKeyEventHelper
使用掃描槍解析類需要在相關類中調用 analysisKeyEvent(KeyEvent event) ,傳入監(jiān)聽事件,當解析相對應事件獲得輸入內容,通過OnScanSuccessListener 接口回調返回
/** * 掃碼槍事件解析類 by chen */ public class ScanGunKeyEventHelper { private final static long MESSAGE_DELAY = 500;//延遲500ms,判斷掃碼是否完成。 private StringBuffer mStringBufferResult;//掃碼內容 private boolean mCaps;//大小寫區(qū)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 ; //獲取系統(tǒng)藍牙適配器管理類 mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); // BluetoothDevice printerdevice = mBluetoothAdapter.getRemoteDevice("ssss"); // BluetoothSocket btSocket = printerdevice.createRfcommSocketToServiceRecord("ssss"); mStringBufferResult = new StringBuffer(); mHandler = new Handler(); mScanningFishedRunnable = new Runnable() { @Override public void run() { performScanSuccess(); } }; } /** * 返回掃碼成功后的結果 */ private void performScanSuccess() { String barcode = mStringBufferResult.toString(); if (mOnScanSuccessListener != null) mOnScanSuccessListener.onScanSuccess(barcode); mStringBufferResult.setLength(0); } /** * 掃碼槍事件解析 * @param event */ public void analysisKeyEvent(KeyEvent event) { int keyCode = event.getKeyCode(); //字母大小寫判斷 checkLetterStatus(event); if (event.getAction() == KeyEvent.ACTION_DOWN) { char aChar = getInputCode(event);; if (aChar != 0) { mStringBufferResult.append(aChar); } if (keyCode == KeyEvent.KEYCODE_ENTER) { //若為回車鍵,直接返回 mHandler.removeCallbacks(mScanningFishedRunnable); mHandler.post(mScanningFishedRunnable); } else { //延遲post,若500ms內,有其他事件 mHandler.removeCallbacks(mScanningFishedRunnable); mHandler.postDelayed(mScanningFishedRunnable, MESSAGE_DELAY); } } } //檢查shift鍵 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) { //按著shift鍵,表示大寫 mCaps = true; } else { //松開shift鍵,表示小寫 mCaps = false; } } } //獲取掃描內容 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) { //數字 aChar = (char) ('0' + keyCode - KeyEvent.KEYCODE_0); } else { //其他符號 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; } //部分手機如三星,無法使用該方法 // private void hasScanGun() { // Configuration cfg = getResources().getConfiguration(); // return cfg.keyboard != Configuration.KEYBOARD_NOKEYS; // } /** * 掃描槍是否連接 * @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; } /** * 輸入設備是否存在 * @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; } /** * 是否為掃碼槍事件(部分機型KeyEvent獲取的名字錯誤) * @param event * @return */ @Deprecated public boolean isScanGunEvent(KeyEvent event) { return event.getDevice().getName().equals(mDeviceName); } /** * 檢測藍牙是否開啟 */ public int checkBluetoothValid() { if(mBluetoothAdapter == null) {//你的設備不具備藍牙功能! return 1; } if(!mBluetoothAdapter.isEnabled()) {//藍牙設備未打開,請開啟此功能后重試! return 2; } return 3;//藍牙正常工作 } }
5.在Activity中使用解析類ScanGunKeyEventHelper
Activity中重寫dispatchKeyEvent方法,截取Key事件。
/** * 截獲按鍵事件.發(fā)給ScanGunKeyEventHelper * * @param event * @return */ @Override public boolean dispatchKeyEvent(KeyEvent event) { if (mScanGunKeyEventHelper.isScanGunEvent(event)) { mScanGunKeyEventHelper.analysisKeyEvent(event); return true; } return super.dispatchKeyEvent(event); }
獲取掃描結果回調,詳細代碼請查看TestScanner
/** * @author Wu JianCheng * @date on 2018/12/18 14:44 * 測試藍牙連接掃描槍功能 */ public class BleAct extends Activity implements ScanGunKeyEventHelper.OnScanSuccessListener { ... /** * 掃描結果回調 * @param barcode */ @Override public void onScanSuccess(String barcode) { showToast(barcode); } ... }
以上就是本文的全部內容,希望對大家的學習有所幫助,也希望大家多多支持腳本之家。
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