Android设备蓝牙连接扫描枪获取扫描内容
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
<!-- 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() {
@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);
}
/**
* 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
*/
@Override
public 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 2018/12/18 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
*/
@Override
public void onScanSuccess(String barcode) {
showToast(barcode);
}
...
}
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