Android EditText 限制输入字符

　　今天为简单的登录界面的输入框（用户名、密码框，验证码），均为EditText框，做输入限制，不能有空格，不能有一些特殊字符，不多说，直接上代码；

    /**
     * 禁止EditText输入空格
     *
     * @param editText
     */
    public static void setEditTextInhibitInputSpaChat(EditText editText) {
        InputFilter filter_space = new InputFilter() {
            @Override
            public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
                if (source.equals(" "))
                    return "";
                else
                    return null;
            }
        };
        InputFilter filter_speChat = new InputFilter() {
            @Override
            public CharSequence filter(CharSequence charSequence, int i, int i1, Spanned spanned, int i2, int i3) {
                String speChat = "[`~!@#_$%^&*()+=|{}':;',\[\].<>/?~！@#￥%……&*（）— +|{}【】‘；：”“’。，、？]";
                Pattern pattern = Pattern.compile(speChat);
                Matcher matcher = pattern.matcher(charSequence.toString());
                if (matcher.find()) return "";
                else return null;
            }
        };
        editText.setFilters(new InputFilter[]{filter_space, filter_speChat});
    }