This article shares the specific code for Android reading scan code module data for your reference. The specific content is as follows
Android reads scan code module data**Receive the read data in the dispatchKeyEvent method**
Receive the read data in the dispatchKeyEvent method
private StringBuilder mScanCodeBuilder = new StringBuilder();
@Override
public boolean dispatchKeyEvent(@NonNull KeyEvent event) {
(TAG, "dispatchKeyEvent " + () + ", " + ());
checkLetterStatus(event);//Judge uppercase and uppercase letters if (() == KeyEvent.ACTION_DOWN) {
(getInputCode(event));
if (() == KeyEvent.KEYCODE_ENTER) {
//If it is the Enter key, return directly String scanResult = ();
(0);
(TAG, "dispatchKeyEvent, " + scanResult);
String scanResults = (" ", "");
} else {
//Delay post, if there are other events within 500ms (mScanningFishedRunnable);
(mScanningFishedRunnable, 500);
}
return true;
}
return (event);
}
Determine uppercase and uppercase letters
private void checkLetterStatus(KeyEvent event) {
int keyCode = ();
if (keyCode == KeyEvent.KEYCODE_SHIFT_RIGHT || keyCode == KeyEvent.KEYCODE_SHIFT_LEFT) {
if (() == KeyEvent.ACTION_DOWN) {
//Press shift key to indicate capitalization mCaps = true;
} else {
//Release shift key to lowercase mCaps = false;
}
}
}
Reading characters
private char getInputCode(KeyEvent event) {
int keyCode = ();
char aChar;
if (keyCode >= KeyEvent.KEYCODE_A && keyCode <= KeyEvent.KEYCODE_Z) {
//letter aChar = (char) ((mCaps ? 'A' : 'a') + keyCode - KeyEvent.KEYCODE_A);
} else if (keyCode >= KeyEvent.KEYCODE_0 && keyCode <= KeyEvent.KEYCODE_9) {
//number aChar = (char) ('0' + keyCode - KeyEvent.KEYCODE_0);
} else {
//symbol 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;
}
}
(TAG, "char" + aChar);
return aChar;
}
Delay 500ms related
private Handler mHandler = new Handler(this);
private final Runnable mScanningFishedRunnable=new Runnable() {
@Override
public void run() {
}
};
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