public void toggleSign() {
DecimalFormatSymbols symbols = ((DecimalFormat) formatter).getDecimalFormatSymbols();
char minus = symbols.getMinusSign();
String exp = symbols.getExponentSeparator();
String text = getText().toString();
int expPos = text.lastIndexOf(exp);
if (expPos == -1) {
if (text.charAt(0) == minus) {
text = text.substring(1);
} else {
text = minus + text;
}
} else { // Exponent entered
try {
if (text.charAt(expPos + exp.length()) == minus) {
text = text.substring(0, expPos) + exp + text.substring(expPos + exp.length() + 1);
} else {
text = text.substring(0, expPos) + exp + minus + text.substring(expPos + exp.length());
}
} catch (StringIndexOutOfBoundsException e) {
text = text + minus;
}
}
setText(text);
}
public static VerifyListener getNumberVerifyListener(Locale locale) {
DecimalFormatSymbols symbols = DecimalFormatSymbols.getInstance(locale);
final char[] allowedChars =
new char[] {
symbols.getDecimalSeparator(),
symbols.getGroupingSeparator(),
symbols.getMinusSign(),
symbols.getZeroDigit(),
symbols.getMonetaryDecimalSeparator(),
'+'
};
final String exponentSeparator = symbols.getExponentSeparator();
return new VerifyListener() {
@Override
public void verifyText(VerifyEvent e) {
for (int i = 0; i < e.text.length(); i++) {
char ch = e.text.charAt(i);
if (!Character.isDigit(ch)
&& !ArrayUtils.contains(allowedChars, ch)
&& exponentSeparator.indexOf(ch) == -1) {
e.doit = false;
return;
}
}
e.doit = true;
}
};
}