android edittext 限制小数点后最多只能输入两位数字

android:inputType="numberDecimal"

private InputFilter lengthFilter = new InputFilter() {
    @Override
    public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
        // source:当前输入的字符
        // start:输入字符的开始位置
        // end:输入字符的结束位置
        // dest：当前已显示的内容
        // dstart:当前光标开始位置
        // dent:当前光标结束位置
        LogUtil.i("", "source=" + source + ",start=" + start + ",end=" + end + ",dest=" + dest.toString() + ",dstart=" + dstart + ",dend=" + dend);
        if (dest.length() == 0 && source.equals(".")) {
            return "0.";
        }
        String dValue = dest.toString();
        String[] splitArray = dValue.split("\\.");
        if (splitArray.length > 1) {
            String dotValue = splitArray[1];
            if (dotValue.length() == 2) {//输入框小数的位数
                return "";
            }
        }
        return null;
    }
};

edit.setFilters(new InputFilter[]{lengthFilter});

class   MyInputFilter implements InputFilter{
   public MyInputFilter(int dotLength) {
      this.dotLength = dotLength;
   }

   int   dotLength ;

   @Override
   public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
      // source:当前输入的字符
      // start:输入字符的开始位置
      // end:输入字符的结束位置
      // dest：当前已显示的内容
      // dstart:当前光标开始位置
      // dent:当前光标结束位置
      LogUtil.i("", "source=" + source + ",start=" + start + ",end=" + end + ",dest=" + dest.toString() + ",dstart=" + dstart + ",dend=" + dend);
      if (dest.length() == 0 && source.equals(".")) {
         return "0.";
      }
      String dValue = dest.toString();
      String[] splitArray = dValue.split("\\.");
      if (splitArray.length > 1) {
         String dotValue = splitArray[1];
         if (dotValue.length() == dotLength) {//输入框小数的位数
            return "";
         }
      }
      return null;
   }
}