應用場景：APP發送串口命令到打印機，打印相應數據小票

// 串口 implementation 'com.github.licheedev.Android-SerialPort-API:serialport:1.0.1'

?1、獲取全部串口地址devicePath

private String[] mDevices; public void getcuankou(){SerialPortFinder serialPortFinder = new SerialPortFinder();mDevices = serialPortFinder.getAllDevicesPath();for (int c = 0;c<mDevices.length;c++){Log.i("lgq","...... "+mDevices[c]);} }

2、連接串口，以及關閉串口

/*** 打開串口** @param devicePath* @param baudrateString* @return*/ public SerialPort open(String devicePath, String baudrateString) {if (mSerialPort != null) {close();}try {File device = new File(devicePath);int baurate = Integer.parseInt(baudrateString);mSerialPort = new SerialPort(device, baurate, 0);mReadThread = new SerialReadThread(mSerialPort.getInputStream());mReadThread.start();mOutputStream = mSerialPort.getOutputStream();mWriteThread = new HandlerThread("write-thread");mWriteThread.start();mSendScheduler = AndroidSchedulers.from(mWriteThread.getLooper());return mSerialPort;} catch (Throwable tr) {LogPlus.e(TAG, "打開串口失敗", tr);close();return null;} }/*** 關閉串口*/ public void close() {if (mReadThread != null) {mReadThread.close();}if (mOutputStream != null) {try {mOutputStream.close();} catch (IOException e) {e.printStackTrace();}}if (mWriteThread != null) {mWriteThread.quit();}if (mSerialPort != null) {mSerialPort.close();mSerialPort = null;} }

Android接收讀卡器以及掃碼器返回數據實現方法

?工具類

public class CardSwipingHelper {private static final String TAG = CardSwipingHelper.class.getSimpleName();private static class SingletonHolder {private static final CardSwipingHelper INSTANCE = new CardSwipingHelper();}private CardSwipingHelper() {}public static final CardSwipingHelper getInstance() {return SingletonHolder.INSTANCE;}private StringBuffer stringBuffer=null ;public boolean dispatchKeyEvent(KeyEvent event) {if (event.getAction() == KeyEvent.ACTION_DOWN) {char pressedKey = (char) event.getUnicodeChar();if(stringBuffer==null){stringBuffer=new StringBuffer();}if (event.getUnicodeChar()==0){return false;}stringBuffer.append(pressedKey);}if (event.getAction() == KeyEvent.ACTION_DOWN && event.getKeyCode() == KeyEvent.KEYCODE_ENTER) {if (mCardSwipingCallBack != null) {mCardSwipingCallBack.enterCardSwipingCont(replaceBlank(stringBuffer.toString()));}stringBuffer = null;return true;}return false;}private CardSwipingCallBack mCardSwipingCallBack;public void setCardSwipingCallBack(CardSwipingCallBack cardSwipingCallBack) {mCardSwipingCallBack = cardSwipingCallBack;}public interface CardSwipingCallBack {void enterCardSwipingCont(String cont);}public static String replaceBlank(String src) {String dest = "";if (src != null) {Pattern pattern = Pattern.compile("\t|\r|\n|\\s*");Matcher matcher = pattern.matcher(src);dest = matcher.replaceAll("");}return dest;} }

回調

private CardSwipingHelper.CardSwipingCallBack mCardSwipingCallBack = new CardSwipingHelper.CardSwipingCallBack() {@Overridepublic void enterCardSwipingCont(String cont) {try {String str2 = new String(cont.getBytes("utf-8"), "gbk");LgqLogutil.e("刷卡返回===== "+cont+"...."+str2);tologin(cont);//刷卡登錄}catch (Exception e){}} };//攔截刷卡的情況http://weixin.qq.com/r/Ti3s9NXE2oilrZGX93hchttp://weixin.qq.com/r/Ti3s9NXE2oilrZGX93hc @Override public boolean dispatchKeyEvent(KeyEvent event) {if (CardSwipingHelper.getInstance().dispatchKeyEvent(event)) {return true;}return super.dispatchKeyEvent(event); }

CardSwipingHelper.getInstance().setCardSwipingCallBack(mCardSwipingCallBack);//掃碼回調

注意：

EditText回攔截回調

USB連接?

action android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" android:resource="@xml/device_filter"

?

?在線回復bug：QQ1085220040

實現demo：https://download.csdn.net/download/meixi_android/12515052

demo云盤地址：https://pan.baidu.com/s/1lOun6ekdOrLoiuQH_WPxag

總結

以上是生活随笔為你收集整理的Android 串口开发，发送串口命令，读卡，反扫码，USB通讯，实现demo。——持续更新的全部內容，希望文章能夠幫你解決所遇到的問題。

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