EditText 限制输入为中文，个数为6个

et_real_name.setFilters(new InputFilter[]{new InputChineseFilter(6)});


class InputChineseFilter implements InputFilter {

        private final int mMax;

        public InputChineseFilter(int max) {
            mMax = max;
        }

        /**
         *
         * @param source 新输入的字符串
         * @param start　新输入的字符串起始下标，一般为0
         * @param end　新输入的字符串终点下标，一般为source长度-1
         * @param dest　输入之前文本框内容
         * @param dstart　原内容起始坐标，一般为0
         * @param dend　原内容终点坐标，一般为dest长度-1
         * @return
         */
        @Override
        public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {

            int newSize = source.length();
            if(!StringUtil.checkNameChese(source.toString())){
                ToastUtil.show("姓名必须为中文");
                return "";
            }

            int destSize = dest.length();

            if(destSize >= mMax){
                return "";
            } else if(newSize + destSize > mMax){
                return source.subSequence(0, mMax - destSize);
            } else {
                return null;//为source源数据
            }
        }
    }

工具类

/**
     * 检测String是否全是中文
     *
     * @param name
     */
    public static boolean checkNameChese(String name) {
        boolean res = true;
        char[] cTemp = name.toCharArray();

        for (int i = 0; i < name.length(); i++) {
            if (!isChinese(cTemp[i])) {
                res = false;
                break;
            }
        }
        return res;
    }


    /* 判定输入的是否是汉字
     *
     * @param c 被校验的字符
     * @return true代表是汉字
     */
    public static boolean isChinese(char c) {
        Character.UnicodeBlock ub = Character.UnicodeBlock.of(c);
        if (ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS
                || ub == Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS
                || ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A
                || ub == Character.UnicodeBlock.GENERAL_PUNCTUATION
                || ub == Character.UnicodeBlock.CJK_SYMBOLS_AND_PUNCTUATION
                || ub == Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS) {
            return true;
        }
        return false;
    }