Limiting the range of numbers in EditTexts

gistfile1.txt

public class NumberRangeInputFilter implements InputFilter {
    private final int min;
    private final int max;

    public NumberRangeInputFilter(int min, int max) {
      this.min = min;
      this.max = max;
    }

    @Override
    public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart,
        int dend) {

      String text = buildString(source.toString(), dest.toString(), dstart, dend);

      try {
        int value = Integer.valueOf(text);

        if (value > max) {
          return String.valueOf(max);
        } else if (value < min) {
          return String.valueOf(min);
        } else {
          return null;
        }
      } catch (NumberFormatException e) {
        return String.valueOf(min);
      }
    }

    private String buildString(String source, String dest, int dstart, int dend) {
      String previousPart = dest.substring(0, dstart);
      String nextPart = dest.substring(dend);

      return previousPart + source + nextPart;
    }
  }