android如何读取扫码模组数据

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具体内容如下

android读取扫码模组数据 **在dispatchKeyEvent方法中承接读取的数据**

在dispatchKeyEvent方法中承接读取的数据

private StringBuilder mScanCodeBuilder = new StringBuilder();   @Override    public boolean dispatchKeyEvent(@NonNull KeyEvent event) {        LogUtil.d(TAG, "dispatchKeyEvent " + event.getAction() + ",   " + event.getKeyCode());           checkLetterStatus(event);//判断大小写字母        if (event.getAction() == KeyEvent.ACTION_DOWN) {             mScanCodeBuilder.append(getInputCode(event));            if (event.getKeyCode() == KeyEvent.KEYCODE_ENTER) {                //若为回车键，直接返回                String scanResult = mScanCodeBuilder.toString();                mScanCodeBuilder.setLength(0);                LogUtil.d(TAG, "dispatchKeyEvent, " + scanResult);                String scanResults = scanResult.replace(" ", "");            } else {                //延迟post，若500ms内，有其他事件                mHandler.removeCallbacks(mScanningFishedRunnable);                mHandler.postDelayed(mScanningFishedRunnable, 500);            }            return true;        }        return super.dispatchKeyEvent(event);    }

判断大小写字母

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;            }        }    }

读取字符方法

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 {        //符号        switch (keyCode) {            case KeyEvent.KEYCODE_GRAVE:                aChar = '`';                break;            case KeyEvent.KEYCODE_COMMA:                aChar = ',';                break;            case KeyEvent.KEYCODE_APOSTROPHE:                aChar = '\'';                break;            case KeyEvent.KEYCODE_POUND:                aChar = '#';                break;            case KeyEvent.KEYCODE_STAR:                aChar = '*';                break;            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;            case KeyEvent.KEYCODE_EQUALS:                aChar = '=';                break;            case KeyEvent.KEYCODE_SEMICOLON:                aChar = ';';                break;            case KeyEvent.KEYCODE_PLUS:                aChar = '+';                break;            case KeyEvent.KEYCODE_AT:                aChar = '@';                break;            case KeyEvent.KEYCODE_LEFT_BRACKET:                aChar = '[';                break;            case KeyEvent.KEYCODE_RIGHT_BRACKET:                aChar = ']';                break;            default:                aChar = ' ';                break;        }    }    Log.d(TAG, "char" + aChar);    return aChar;}

延迟500毫秒相关

private Handler mHandler = new Handler(this);    private final Runnable mScanningFishedRunnable=new Runnable() {        @Override        public void run() {        }    };

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