package com.example.app_10p5;
  
  import android.text.InputFilter;
  import android.text.Spanned;
  
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  /**
   * Created by beaus on 02/05/2016.
   */
  public class DecimalDigitsInputFilter implements InputFilter {
  
      Pattern mPattern;
  
      public DecimalDigitsInputFilter(int digitsBeforeZero,int digitsAfterZero) {

          mPattern = Pattern.compile("(0|[1-9][0-9]{0,2})?([,.][0-9]{0,2})?");
  

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

          String result =
                  dest.subSequence(0, dstart)
                          + source.toString()
                          + dest.subSequence(dend, dest.length());
  
          Matcher matcher = mPattern.matcher(result);
  
          if (!matcher.matches()) return dest.subSequence(dstart, dend);
  

          return null;
      }
  
  }