《安卓应用开发学习》–XML解析作业

实现功能：解析AddressTable.xml,里面存放的是中国的省、市、县、镇，通过省、市查看对应的、县市，然后在查询下一级。

<China>
  <firstAddress AddressCode="1100000000" AddressName="北京" AddressDisabled="N">
    <secondAddress AddressCode="1101000000" AddressName="市辖区" AddressDisabled="N">
      <thirdAddress AddressCode="1101010000" AddressName="东城区1" AddressDisabled="N" />
      <thirdAddress AddressCode="1101020000" AddressName="西城区" AddressDisabled="N" />
      <thirdAddress AddressCode="1101030000" AddressName="崇文区" AddressDisabled="N" />
      <thirdAddress AddressCode="1101040000" AddressName="宣武区" AddressDisabled="N" />
      <thirdAddress AddressCode="1101050000" AddressName="朝阳区" AddressDisabled="N" />
      <thirdAddress AddressCode="1101060000" AddressName="丰台区" AddressDisabled="N" />
      <thirdAddress AddressCode="1101070000" AddressName="石景山区" AddressDisabled="Y" />
      <thirdAddress AddressCode="1101080000" AddressName="海淀区" AddressDisabled="Y" />
      <thirdAddress AddressCode="1101090000" AddressName="门头沟区" AddressDisabled="Y" />
      <thirdAddress AddressCode="1101110000" AddressName="房山区" AddressDisabled="Y" />
      <thirdAddress AddressCode="1101120000" AddressName="通州区" AddressDisabled="Y" />
      <thirdAddress AddressCode="1101130000" AddressName="顺义区" AddressDisabled="Y" />
      <thirdAddress AddressCode="1101140000" AddressName="昌平区" AddressDisabled="Y" />
      <thirdAddress AddressCode="1101150000" AddressName="大兴区" AddressDisabled="Y" />
      <thirdAddress AddressCode="1101160000" AddressName="怀柔区" AddressDisabled="Y" />
      <thirdAddress AddressCode="1101170000" AddressName="平谷区" AddressDisabled="Y" />
    </secondAddress>
    <secondAddress AddressCode="1102000000" AddressName="县" AddressDisabled="N">
      <thirdAddress AddressCode="1102280000" AddressName="密云" AddressDisabled="N" />
      <thirdAddress AddressCode="1102290000" AddressName="延庆县" AddressDisabled="N" />
    </secondAddress>
  </firstAddress>

部分文件展示，解析XML文件的核心代码如下：

public void getChinaAddresssFromXml(Context context, String fileName) {
		Node first = null;
		Node second = null;
		Node third = null;
		try {
			// 首先找到xml文件
			factory = DocumentBuilderFactory.newInstance();
			// 找到xml，并加载文档
			builder = factory.newDocumentBuilder();
			inputStream = context.getResources().getAssets().open(fileName);
			document = builder.parse(inputStream);
			// 找到根Element
			Element root = document.getDocumentElement();
			// firstAddress
			NodeList nodelist = root.getChildNodes();
			for (int i = 0; i < nodelist.getLength(); i++) {
				first = nodelist.item(i);
				// firstAddress
				if (first.getNodeType() == Node.ELEMENT_NODE) {
					if (first.getNodeName().equals("firstAddress")) {
						NamedNodeMap namednodemap = first.getAttributes();
						String AddressCode = namednodemap.getNamedItem(
								"AddressCode").getNodeValue();
						String AddressName = namednodemap.getNamedItem(
								"AddressName").getNodeValue();
						String AddressDisabled = namednodemap.getNamedItem(
								"AddressDisabled").getNodeValue();

						province.add(new ChinaAddress(AddressCode, AddressName,
								AddressDisabled));

					}
				}
				// secondAddress
				for (second = first.getFirstChild(); second != null; second = second
						.getNextSibling()) {
					if (second.getNodeType() == Node.ELEMENT_NODE) {
						if (second.getNodeName().equals("secondAddress")) {
							NamedNodeMap namednodemap = second.getAttributes();
							String AddressCode = namednodemap.getNamedItem(
									"AddressCode").getNodeValue();
							String AddressName = namednodemap.getNamedItem(
									"AddressName").getNodeValue();
							String AddressDisabled = namednodemap.getNamedItem(
									"AddressDisabled").getNodeValue();

							county.add(new ChinaAddress(AddressCode,
									AddressName, AddressDisabled));

						}

					}
					// thirdAddress
					for (third = second.getFirstChild(); third != null; third = third
							.getNextSibling()) {
						if (third.getNodeType() == Node.ELEMENT_NODE) {
							if (third.getNodeName().equals("thirdAddress")) {
								NamedNodeMap namednodemap = third
										.getAttributes();
								String AddressCode = namednodemap.getNamedItem(
										"AddressCode").getNodeValue();
								String AddressName = namednodemap.getNamedItem(
										"AddressName").getNodeValue();
								String AddressDisabled = namednodemap
										.getNamedItem("AddressDisabled")
										.getNodeValue();

								town.add(new ChinaAddress(AddressCode,
										AddressName, AddressDisabled));
							}
						}

					}

				}

			}

		} catch (IOException e) {
			e.printStackTrace();
		} catch (SAXException e) {
			e.printStackTrace();
		} catch (ParserConfigurationException e) {
			e.printStackTrace();
		} finally {
			try {
				inputStream.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}

	}

该XML文件里主要有三个标签firstAddress，secondAddress，thirdAddress，通过for循环调用getNo的Name()方法进行判断,然后调用getAttributes()获取属性，接着再调用getNamedItem( “AddressCode”).getNodeValue()获取对应属性名的值即可。

使用ListView展示部分，具体看代码，并不难。主要是解析XML获取到想要的值填充到

private ArrayList<ChinaAddress> province = new ArrayList<ChinaAddress>();
 private ArrayList<ChinaAddress> county = new ArrayList<ChinaAddress>();
 private ArrayList<ChinaAddress> town = new ArrayList<ChinaAddress>();

然后再映射到对应的ListView即可，关键部分是就是ListView的监听，获取对应项的AddressCode，并用于判断下一个ListView应该填充哪些内容。

listview.setOnItemClickListener(new OnItemClickListener() {

			@SuppressWarnings("unchecked")
			@Override
			public void onItemClick(AdapterView<?> parent, View view,
					int position, long id) {
				HashMap<String, Object> map = (HashMap<String, Object>) parent
						.getItemAtPosition(position);
				String name = (String) map.get("AddressName");
				AddressCode = (String) map.get("AddressCode");
				String keyCode = AddressCode.substring(0, 2);
				// Toast.makeText(MainActivity.this, name + keyCode, 0).show();
				HashMap<String, Object> countymap;
				ChinaAddress c;
				countyDataList.clear();
				for (int i = 0; i < county.size(); i++) {
					c = new ChinaAddress();
					c = county.get(i);
					// 根据代码获取选区省市对应的县、镇
					if (c.getAddressCode().substring(0, 2).equals(keyCode)) {
						countymap = new HashMap<String, Object>();
						countymap.put("AddressName", c.getAddressName());
						countymap.put("AddressCode", c.getAddressCode());
						countymap.put("AddressDisabled", c.getAddressDisabled());
						countyDataList.add(countymap);
					}

				}
				// 设置countyDataList共享
				((MyAppData) getApplication())
						.setCountyDataList(countyDataList);
				Intent intent = new Intent();
				intent.putExtra("TITLE", name);
				intent.setClass(MainActivity.this, CountyActivity.class);
				startActivity(intent);
			}
		});

基本上差不多，代码很简单，下载源代码自己查看即可。对了，搜素功能暂未实现，有兴趣可以自己试试。

http://pan.baidu.com/s/1ntt4RA5点击打开链接

运行截图：