摘要:[Android][筆記]簡化自製版XML讀寫Lib with 超好用tool(org.w3c.dom.Node)
這麼好用的東西一定要筆記起來，似乎也Support .Net，隱約記得寫.Net 的動態Menu功能並使用XML記錄架構時也用過這個東東，
會有印象主要還是Function name也一模一樣，有空寫一套自己習慣的Lib我個人認為也是不錯的事情。所以下面放一個簡單範例，
並未作詳細測試，所以如果要用可能要排除一點ERROR XD。
目的: 在設備中讀寫XML檔，ex.如果想使用DB，可以將設定檔寫在XML檔中，再做存取設定
public class XMLHelper2 {
public static final String TAG = "XMLHelper2";
private static String xmlPath = "/sdcard/Project/MyPath/Settings.xml";
public static Document document =null;
public XMLHelper2() throws ParserConfigurationException, SAXException, IOException {
if(document==null)
init();
}
public static void setXMLPath(String path)
{
xmlPath=path;
}
public static String getXMLPath()
{
return xmlPath;
}
public static void init() throws ParserConfigurationException, SAXException, IOException
{
DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory
.newInstance();
DocumentBuilder documentBuilder = documentBuilderFactory
.newDocumentBuilder();
document = documentBuilder.parse(new File(xmlPath));
}
// 取得某個Node下面ChildNode裡，回傳特定tagName及Attribute Value的Node
private static Node Help_getChildNodes(String tagName,Node Node, String[] Attr, String[] AttrVal) {
org.w3c.dom.Element element = (org.w3c.dom.Element) Node;
NodeList ls = element.getElementsByTagName(tagName);
if(ls==null)
return null;
for (int i = 0; i < ls.getLength(); i++) {
boolean pass = true;
for (int j = 0; j < Attr.length; j++) {
if (!Help_getNodeAttr(ls.item(i), Attr[j]).equals(AttrVal[j]))
pass = false;
continue;
}
if (pass)
return ls.item(i);
}
return null;
}
//取得特定Node的Attribute
public static String Help_getNodeAttr(Node Node, String Attr) {
if (Node == null)
return null;
NamedNodeMap attributes = Node.getAttributes();
for (int i = 0; i < attributes.getLength(); i++) {
Attr attr = (Attr) attributes.item(i);
if(attr.getNodeName().trim().equals(Attr.trim()))
return attr.getNodeValue();
}
return null;
}
//取得Node的值
public static String Help_getNodeValueByName(Node node, String NodeName) {
NodeList nodes = node.getChildNodes();
for (int i = 0; i < nodes.getLength(); i++) {
Node element = nodes.item(i);
if (NodeName.equals(element.getNodeName())) {
return element.getTextContent();
}
}
return "";
}
//更新Node
public static NodeList updateNode(NodeList nodes,String NodeName,String Value)
{
for (int i = 0; i < nodes.getLength(); i++) {
Node element = nodes.item(i);
if (NodeName.equals(element.getNodeName())) {
element.setTextContent(Value);
}
}
return nodes;
}
public static void save() throws TransformerException
{
// write the DOM object to the file
TransformerFactory transformerFactory = TransformerFactory
.newInstance();
Transformer transformer = transformerFactory.newTransformer();
DOMSource domSource = new DOMSource(document);
StreamResult streamResult = new StreamResult(new File(xmlPath));
transformer.transform(domSource, streamResult);
}
//設定Node Attribute
public static boolean Help_setNodeAttr(Node element, String[] AttrName, String[] AttrValue) {
try {
if (AttrName.length != AttrValue.length)
throw new Exception("Node的Attribute Name長度跟Attribute Value長度不一致");
NamedNodeMap attributes = element.getAttributes();
// get the number of nodes in this map
for (int i = 0; i < AttrName.length; i++) {
Node nodeAttr = attributes.getNamedItem(AttrName[i]);
if (nodeAttr != null) // 存在就修改
nodeAttr.setTextContent(AttrValue[i]);
else // 沒有就"新增"
{
// create attribute
Attr genderAttribute = document.createAttribute(AttrName[i]);
genderAttribute.setValue(AttrValue[i]);
((org.w3c.dom.Element) element).setAttributeNode(genderAttribute);
}
}
return true;
} catch (Exception e) {
// TODO: handle exception
return false;
}
}
}
XML Format
<?xml version="1.0" encoding="utf-8"?>
<PageSettings>
<page id="1" cols="2" rows="1">
<view ColNo="0" RowNo="0" ColSpan="1" RowSpan="1">
<Attributes></Attributes>
</view>
<view ColNo="1" RowNo="0" ColSpan="1" RowSpan="1">
<Attributes>X</Attributes>
</view>
<page id="2" cols="2" rows="1">
<view ColNo="0" RowNo="0" ColSpan="1" RowSpan="1">
<Attributes>Y</Attributes>
</view>
<view ColNo="1" RowNo="0" ColSpan="1" RowSpan="1">
<Attributes>Z</Attributes>
</view>
</page>
</PageSettings>
//使用方式---簡單範例
public void Test()
{
String row="0";
String col="1";
String PageId="1";
//取得該節點
Node view=getKeyNode(PageId,col,row);
//取得節點內容
String AttributeValue= XMLHelper2.Help_getNodeValueByName(view,"Attributes"); //Value ==> X
//alert AttributeValue
}
public Node getKeyNode(String Page,String Col,String Row) throws ParserConfigurationException, SAXException, IOException
{
Node root =document.getDocumentElement(); //取根節點
//第二層Page Stage
Node page=Help_getChildNodes("page", root,new String[]{"id"},new String[]{Page}); //找到Tagename='page' 且 id=Page的 Page層Node
//第三層View Stage
Node view=Help_getChildNodes("view", page,new String[]{"ColNo","RowNo"},new String[]{Col,Row});
return view;
}