android读取扫码模组数据的方法
作者：虾皮条
这篇文章主要为大家详细介绍了android读取扫码模组数据的方法，文中示例代码介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们可以参考一下
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();
@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() {
}
};
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。