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小編給大家分享一下Android設備藍牙連接掃描槍怎么獲取掃描內容，相信大部分人都還不怎么了解，因此分享這篇文章給大家參考一下，希望大家閱讀完這篇文章后大有收獲，下面讓我們一起去了解一下吧！
打開系統設置，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
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" />
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;
}使用掃描槍解析類需要在相關類中調用 analysisKeyEvent(KeyEvent event) ，傳入監聽事件，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
}
}Activity中重寫dispatchKeyEvent方法，截取Key事件。
/**
* 截獲按鍵事件.發給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);
}
...
}以上是“Android設備藍牙連接掃描槍怎么獲取掃描內容”這篇文章的所有內容，感謝各位的閱讀！相信大家都有了一定的了解，希望分享的內容對大家有所幫助，如果還想學習更多知識，歡迎關注億速云行業資訊頻道！
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