android读取扫码模组数据
16lz
2021-01-23
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() { } };更多相关文章
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