使用Android上先进的XML [英] Use advanced xml on android

问题描述

我有这样一个XML文件：

i have a xml file like:

<xml>
    <userlist sub='A'>
        <user id='1'>Daan</user>
        <user id='2'>Maarten</user>
        <user id='3'>Wannes</user>
        <user id='4'>Kobe</user>
        ...
    </userlist>
    <userlist sub='B'>
        <user id='5'>Fien</user>
        <user id='6'>Lisa</user>
        <user id='7'>Charlot</user>
        <user id='8'>Agnes</user>
        ...
    </userlist>
    <userdata>
        <userd id='1'>
            <phone>0123498519</phone>
            <genre>M</genre>
            ...
        </userd>
        <userd id='2'>
            <phone>0123958519</phone>
            <genre>M</genre>
            ...
        </userd>
        <userd id='3'>
            <phone>0143488569</phone>
            <genre>M</genre>
            ...
        </userd>
        ...
    </userdata>
</xml>

现在我用这个code，让我的用户列表

Now I use this code to get my list of users

DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder(); 
Document XmlCode = documentBuilder.parse(database);
XmlCode.getDocumentElement().normalize();
NodeList nodeList = XmlCode.getElementsByTagName("userlist");

但现在我得到的所有＆lt;使用者＆GT; 元素，我怎么可以只选择＆LT;用户列表＆GT; 其中子是'A'？

But now I get all the <user> elements, how can I select only the <userlist> where sub is 'A'?

和我怎么能如选择id为3的用户的电话号码吗？

And how can I select for example the phone number of of the user with id '3'?

推荐答案

您解析XML和构建成一个数据结构适合于您的应用程序，它可以是内存中的数据结构，也可以是一个SQLite数据库，你再查询。你绝不会做这些类型的操作对原始XML的任何语言​​或任何平台 - 它的可怕效率低下。

You parse the xml and build it into a data structure suitable for your application, which may be an in memory data structure or may be a SQLite DB that you then query. You would never do those kind of operations on raw xml in any language or any platform- its hideously inefficient.

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