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1、判断金额的正则式
^([1-9]\d{0,9}|0)([.]?|(\.\d{1,2})?)$

  mItem4TypeTextInput.setFilters(new InputFilter[]{new FilterUtil(4)});
  
  /**
 * 作者：小胖
 * 创建时间 2018/8/27
 * 功能描述：根据正则式过滤
 */

public class FilterUtil implements InputFilter {
    //小数点后个数
    private int num;

    public FilterUtil(int num) {
        this.num = num;
    }

    @Override
    public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
        String sourceText = source.toString();
        String destText = dest.toString();

        //验证删除等按键
        if (TextUtils.isEmpty(sourceText)) {
            return "";
        }
        if (!regularPhone(destText + sourceText)) {
            return "";
        }
        return sourceText;
    }


    private boolean match(String regex, String str) {
        if (TextUtils.isEmpty(str))
            return false;
        Pattern pattern = Pattern.compile(regex);
        Matcher matcher = pattern.matcher(str);
        return matcher.matches();
    }

    /**
     * 电话号码正则表达式
     *
     * @param phoneNumber
     * @return
     */
    public boolean regularPhone(String phoneNumber) {
        String regular = "^([1-9]\\d{0,9}|0)([.]?|(\\.\\d{1," + num + "})?)$";
        return match(regular, phoneNumber);
    }
}