利用InputFilter限制输入的类型以及字数

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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);                    //只可以输入数字、字母、汉字                    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});

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