- if (val.isEmpty())
- tvAmount.setKeyListener(DigitsKeyListener.getInstance(
- "0123456789+-" + decimalSeparator + decimalDot));
- else if (val.contains(decimalSeparator) || val.contains(decimalDot))
- tvAmount.setKeyListener(DigitsKeyListener.getInstance("0123456789"));
- else
- tvAmount.setKeyListener(DigitsKeyListener.getInstance(
- "0123456789" + decimalSeparator + decimalDot));
+ if (val.isEmpty() || (tvAmount.getSelectionStart() == 0))
+ allowed += "-";
+ if (!val.contains(decimalSeparator) && !val.contains(decimalDot))
+ allowed += decimalSeparator + decimalDot;
+
+ tvAmount.setKeyListener(DigitsKeyListener.getInstance(allowed));