private InputFilter mInputFilter;
private InputFilter mInputFilterLengh;
mInputFilter = new InputFilter() {
            @Override
            public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
                String stringSourse = source.toString();
                StringBuilder stringBuilder = new
 
 StringBuilder();
                for (int i = 0; i < stringSourse.length(); i++) {
                    char ch = stringSourse.charAt(i);
                    //只可以輸入數字、字母、漢字
                    String regEx = "[a-zA-Z0-9\u4E00-\u9FA5]";
                    Pattern p = Pattern.compile(regEx);
                    Matcher m = p.matcher(ch + ""
 
);
                    if (m.matches()) {
                        stringBuilder.append(ch);
                    }
                }
                return stringBuilder;
            }
        };
        mInputFilterLengh = new InputFilter.LengthFilter(30);
        mEditTextBranch.setFilters(new InputFilter[]{mInputFilter,mInputFilterLengh});