Java Android : XML Parsing getting the value of a tag

Question

我正在尝试解析 xml 文件，但似乎不明白它是如何工作的。我已经调试了几个小时，但似乎无法获得正确的值。我已经设法让代码适用于 tracklist 标签，但不适用于playbacklist 标签及其子标签。

我想要一个播放设备的值，将来会添加更多。

这是 xml 源:

<?xml version="1.0" encoding="ISO-8859-1"?>
<root>
<tracklist>
    <track>track001.mp3</track>
    <track>track002.mp3</track>
    <track>track003.mp3</track>
    <track>track004.mp3</track>
    <track>track005.mp3</track>
    <track>track006.mp3</track>
    <track>track007.mp3</track>
    <track>track008.mp3</track>
    <track>track009.mp3</track>
    <track>track010.mp3</track>
</tracklist>
<playbacklist>
    <playback>
        <name>Speaker1</name>
        <ip>192.168.1.103</ip>
        <room>Kitchen</room>
        <options>0</options>
        <state>NotPlaying</state>
    </playback>
</playbacklist>
</root>

这是java代码(代码 fragment ):这个代码对我有用

DocumentBuilder db = factory.newDocumentBuilder();
Document doc = db.parse(inStream);
NodeList nodeList = doc.getElementsByTagName("root");

for (int index = 0; index < nodeList.getLength(); index++) {
Node node = nodeList.item(index);
if (node.getNodeType() == Node.ELEMENT_NODE) {
    Element element = (Element) node;
    NodeList nameNode = element.getChildNodes();
    for (int iIndex = 0; iIndex < nameNode.getLength(); iIndex++) {
        if (nameNode.item(iIndex).getNodeType() == Node.ELEMENT_NODE) {
                Element nameElement = (Element) nameNode.item(iIndex);
                    if(nameElement.getNodeName().equals("tracklist")){
                NodeList trackNodes = nameElement.getChildNodes();
            for(int i=0;i<trackNodes.getLength();i++){
                if (trackNodes.item(i).getNodeType() == Node.ELEMENT_NODE) {
                    Element trackElement = (Element) trackNodes.item(i);
                    playlist.add(trackElement.getFirstChild().getNodeValue());
                    }
                }
            } 

此代码对我不起作用:

        if(nameElement.getNodeName().equals("playbacklist")){
            NodeList devicesNodes = nameElement.getChildNodes();
            for(int j=0;j<=devicesNodes.getLength();j++){
                Node nodeDevice = devicesNodes.item(j);
                NodeList childNodes = nodeDevice.getChildNodes();

Answer 1

我建议你使用SAX解析器，它比其他解析器简单且高效

如何解析:How to parse XML using the SAX parser