Android first---xml文件生成与解析

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一、使用append进行xml生成

Message类属性：private String body;
   private String date;
      private String address;
      private String type;

public class MainActivity extends Activity {

List<Message> smsList;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);

       //虚拟10条短信数据
       smsList = new ArrayList<Message>();
       for(int i = 0; i < 10; i++){
           Message sms = new Message("小志好棒" + i, System.currentTimeMillis() + "", "601"+i, "1");
           smsList.add(sms);
       }
   }

public void click(View v){
       //在内存中把xml备份短信的格式拼接出来
       StringBuffer sb = new StringBuffer();
       sb.append("<?xml version='1.0' encoding='utf-8' standalone='yes' ?>");
       sb.append("<messages>");
       for (Message sms : smsList) {
           sb.append("<sms>");

           sb.append("<body>");
           sb.append(sms.getBody());
           sb.append("</body>");

           sb.append("<date>");
           sb.append(sms.getDate());
           sb.append("</date>");

           sb.append("<type>");
           sb.append(sms.getType());
           sb.append("</type>");

           sb.append("<address>");
           sb.append(sms.getAddress());
           sb.append("</address>");

           sb.append("</sms>");
       }
       sb.append("</messages>");

       File file = new File("sdcard/sms.xml");
       try {
           FileOutputStream fos = new FileOutputStream(file);
           fos.write(sb.toString().getBytes());
           fos.close();
       } catch (Exception e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       }
   }

}

二、使用xml序列化器进行xml文件生成

Message类属性：private String body;
   private String date;
      private String address;
      private String type;

public class MainActivity extends Activity {

List<Message> smsList; //定义集合

@Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);

// 虚拟10条数据
       smsList = new ArrayList<Message>();
       for (int i = 0; i < 10; i++) {
           Message sms = new Message("小志好棒" + i, System.currentTimeMillis()
                   + "", "601" + i, "1");
           smsList.add(sms);
       }
   }

public void click(View v){
       //使用xml序列化器生成xml文件
       //1.拿到序列化器对象
       XmlSerializer xs = Xml.newSerializer();
       //2.初始化
       File file = new File("sdcard/sms2.xml");
       try {
           FileOutputStream fos = new FileOutputStream(file);
           //enconding:指定用什么编码生成xml文件
           xs.setOutput(fos, "utf-8");

           //3.开始生成xml文件
           //enconding:指定头结点中的enconding属性的值
           xs.startDocument("utf-8", true);

           xs.startTag(null, "message");

           for (Message sms : smsList) {
               xs.startTag(null, "sms");

               xs.startTag(null, "body");
               xs.text(sms.getBody() + "<body>");
               xs.endTag(null, "body");

               xs.startTag(null, "date");
               xs.text(sms.getDate());
               xs.endTag(null, "date");

               xs.startTag(null, "type");
               xs.text(sms.getType());
               xs.endTag(null, "type");

               xs.startTag(null, "address");
               xs.text(sms.getAddress());
               xs.endTag(null, "address");

               xs.endTag(null, "sms");
           }

           xs.endTag(null, "message");

           //告诉序列化器，文件生成完毕
           xs.endDocument();
       } catch (Exception e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       }
   }

}

三、使用PULL解析文件解析xml文件

City的属性： private String name;
private String temp;
private String pm

public class MainActivity extends Activity {

List<City> cityList;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
   }

public void click(View v){
       //获取到src文件夹下的资源文件
       InputStream is = getClassLoader().getResourceAsStream("weather.xml");

       //拿到pull解析器对象
       XmlPullParser xp = Xml.newPullParser();
       //初始化
       try {
           xp.setInput(is, "gbk");

           //获取当前节点的事件类型，通过事件类型的判断，我们可以知道当前节点是什么节点，从而确定我们应该做什么操作
           int type = xp.getEventType();
           City city = null;
           while(type != XmlPullParser.END_DOCUMENT){
               //根据节点的类型，要做不同的操作
               switch (type) {
               case XmlPullParser.START_TAG:
                   //                   获取当前节点的名字
                   if("weather".equals(xp.getName())){
                       //创建city集合对象，用于存放city的javabean
                       cityList = new ArrayList<City>();
                   }
                   else if("city".equals(xp.getName())){
                       //创建city的javabean对象
                       city = new City();
                   }
                   else if("name".equals(xp.getName())){
                       //               获取当前节点的下一个节点的文本
                       String name = xp.nextText();
                       city.setName(name);
                   }
                   else if("temp".equals(xp.getName())){
                       //               获取当前节点的下一个节点的文本
                       String temp = xp.nextText();
                       city.setTemp(temp);
                   }
                   else if("pm".equals(xp.getName())){
                       //               获取当前节点的下一个节点的文本
                       String pm = xp.nextText();
                       city.setPm(pm);
                   }
                   break;
               case XmlPullParser.END_TAG:
                   if("city".equals(xp.getName())){
                       //把city的javabean放入集合中
                       cityList.add(city);
                   }
                   break;

}

               //把指针移动到下一个节点，并返回该节点的事件类型
               type = xp.next();
           }

           for (City c : cityList) {
               System.out.println(c.toString());
           }
       } catch (Exception e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       }
   }