android读取扫码模组数据的方法 android读取扫码模组数据的方法

本文实例为大家分享了android读取扫码模组数据的具体代码，供大家参考，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(); @Overridepublic 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