一般在我們初始化的時候，給需要限制的edittext直接設定 

//禁止輸入空格
setEditTextInhibitInputSpeChat(et_nickname);

//禁止輸入空格
    private void setEditTextInhibitInputSpeChat(EditText et_names) {
        InputFilter filter=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;
            }
        };
        et_names.setFilters(new InputFilter[]{filter});
    }
//禁止輸入字元
setEditTextInhibitInputSpeChats(et_username);
//禁止新增非法字元
    private void setEditTextInhibitInputSpeChats(EditText et_name) {
        InputFilter filter=new InputFilter() {
            @Override
            public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
                String speChat="[`
 
[email protected]#$%^&*()+=|{}':;',\\[\\].<>/?~！@#￥%……&*（）——+|{}【】‘；：”“’。，、？]";
                Pattern pattern = Pattern.compile(speChat);
                Matcher matcher = pattern.matcher(source.toString());
                if(matcher.find())
                    return "";
                else return null;
            }
        };

        et_name.setFilters(new InputFilter[]{filter});

    }