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使用PULL解析XML文件
转载出处：http://blog.csdn.net/wangkuifeng0118/article/details/7313241
XmlPull和Sax类似，是基于流（stream）操作文件，然后根据节点事件回调开发者编写的处理程序。因为是基于流的处理，因此Xmlpull和 Sax都比较节约内存资源，不会象Dom那样要把所有节点以对橡树的形式展现在内存中。 但Xmlpull比Sax更简明，而且不需要扫描完整个流。
下面来看一个pull解析xml的例子：
student.xml:
1 <?xml version="1.0" encoding="utf-8"?> 2 <root> 3 <student id="1" group="1"> 4 <name>张三</name> 5 <sex>男</sex> 6 <age>18</age> 7 <email>zhangsan@163.com</email> 8 <birthday>1987-06-08</birthday> 9 <memo>好学生</memo> 10 </student> 11 <student id="2" group="2"> 12 <name>李四</name> 13 <sex>女</sex> 14 <age>18</age> 15 <email>lisi@163.com</email> 16 <birthday>1987-06-08</birthday> 17 <memo>好学生</memo> 18 </student> 19 <student id="3" group="3"> 20 <name>小王</name> 21 <sex>男</sex> 22 <age>18</age> 23 <email>xiaowang@163.com</email> 24 <birthday>1987-06-08</birthday> 25 <memo>好学生</memo> 26 </student> 27 <student id="4" group="4"> 28 <name>小张</name> 29 <sex>男</sex> 30 <age>18</age> 31 <email>xiaozhang@163.com</email> 32 <birthday>1987-06-08</birthday> 33 <memo>好学生</memo> 34 </student> 35 <student id="5" group="5"> 36 <name>小明</name> 37 <sex>男</sex> 38 <age>18</age> 39 <email>xiaoming@163.com</email> 40 <birthday>1987-06-08</birthday> 41 <memo>好学生</memo> 42 </student> 43 </root>
对应的bean：
1 public class Student { 2 3 private int id; 4 private int group; 5 private String name; 6 private String sex; 7 private int age; 8 private String email; 9 private String memo; 10 private String birthday; 11 public int getId() { 12 return id; 13 } 14 public void setId(int id) { 15 this.id = id; 16 } 17 public int getGroup() { 18 return group; 19 } 20 public void setGroup(int group) { 21 this.group = group; 22 } 23 public String getName() { 24 return name; 25 } 26 public void setName(String name) { 27 this.name = name; 28 } 29 public String getSex() { 30 return sex; 31 } 32 public void setSex(String sex) { 33 this.sex = sex; 34 } 35 public int getAge() { 36 return age; 37 } 38 public void setAge(int age) { 39 this.age = age; 40 } 41 public String getEmail() { 42 return email; 43 } 44 public void setEmail(String email) { 45 this.email = email; 46 } 47 public String getMemo() { 48 return memo; 49 } 50 public void setMemo(String memo) { 51 this.memo = memo; 52 } 53 public String getBirthday() { 54 return birthday; 55 } 56 public void setBirthday(String birthday) { 57 this.birthday = birthday; 58 } 59 60 }
主要的解析和现实类：
1 import java.io.InputStream; 2 import java.util.ArrayList; 3 import java.util.List; 4 5 import org.xmlpull.v1.XmlPullParser; 6 import org.xmlpull.v1.XmlPullParserFactory; 7 8 import android.app.Activity; 9 import android.os.Bundle; 10 import android.os.Handler; 11 import android.os.Message; 12 import android.view.ViewGroup.LayoutParams; 13 import android.widget.LinearLayout; 14 15 import android.widget.TextView; 16 17 public class PullActivity extends Activity implements Runnable{ 18 19 private TextView pullTextView ; 20 private LinearLayout layout; 21 private Handler handler=new Handler(){ 22 public void handleMessage(android.os.Message msg) { 23 List<Student> lists=(List<Student>) msg.obj; 24 for(int i=0;i<lists.size();i++){ 25 Student student=lists.get(i); 26 StringBuffer sb=new StringBuffer(); 27 sb.append(student.getId()+" ").append(student.getName()+" ") 28 .append(student.getAge()+" ").append(student.getSex()+" ").append(student.getBirthday()+" ") 29 .append(student.getEmail()+" ").append(student.getGroup()+" "); 30 TextView txt=new TextView(getApplicationContext()); 31 txt.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)); 32 txt.setText(sb.toString()); 33 layout.addView(txt); 34 } 35 }; 36 }; 37 @Override 38 protected void onCreate(Bundle savedInstanceState) { 39 // TODO Auto-generated method stub 40 super.onCreate(savedInstanceState); 41 setContentView(R.layout.pull); 42 43 pullTextView=(TextView) this.findViewById(R.id.pullTextView); 44 layout=(LinearLayout) this.findViewById(R.id.layout); 45 new Thread(this).start(); 46 47 48 49 } 50 //pull解析xml 51 public List<Student> pullParseXml(){ 52 List<Student> lists=null; 53 Student student=null; 54 55 try { 56 XmlPullParserFactory factory=XmlPullParserFactory.newInstance(); 57 //获取XmlPullParser实例 58 XmlPullParser pullParser=factory.newPullParser(); 59 InputStream in=this.getClass().getClassLoader().getResourceAsStream("student.xml"); 60 pullParser.setInput(in, "UTF-8"); 61 //开始 62 int eventType=pullParser.getEventType(); 63 64 while(eventType!=XmlPullParser.END_DOCUMENT){ 65 String nodeName=pullParser.getName(); 66 switch (eventType) { 67 //文档开始 68 case XmlPullParser.START_DOCUMENT: 69 lists=new ArrayList<Student>(); 70 break; 71 72 //开始节点 73 case XmlPullParser.START_TAG: 74 if("student".equals(nodeName)){ 75 student=new Student(); 76 student.setId(Integer.parseInt(pullParser.getAttributeValue(0))); 77 student.setGroup(Integer.parseInt(pullParser.getAttributeValue(1))); 78 }else if("name".equals(nodeName)){ 79 student.setName(pullParser.nextText()); 80 }else if("sex".equals(nodeName)){ 81 student.setSex(pullParser.nextText()); 82 }else if("age".equals(nodeName)){ 83 student.setAge(Integer.parseInt(pullParser.nextText())); 84 }else if("email".equals(nodeName)){ 85 student.setEmail(pullParser.nextText()); 86 }else if("birthday".equals(nodeName)){ 87 student.setBirthday(pullParser.nextText()); 88 }else if("memo".equals(nodeName)){ 89 student.setMemo(pullParser.nextText()); 90 } 91 break; 92 //结束节点 93 case XmlPullParser.END_TAG: 94 if("student".equals(nodeName)){ 95 lists.add(student); 96 student=null; 97 } 98 break; 99 default:100 break;101 }102 // 手动的触发下一个事件 103 eventType=pullParser.next();104 }105 } catch (Exception e) {106 // TODO Auto-generated catch block107 e.printStackTrace();108 }109 return lists;110 111 }112 @Override113 public void run() {114 // TODO Auto-generated method stub115 List<Student> lists=pullParseXml();116 Message msg=handler.obtainMessage();117 msg.obj=lists;118 handler.sendMessage(msg);119 }120 }
注意xml中的<?xml version="1.0" encoding="utf-8"?> 这句话要顶格显示，不要留空隙，附则错了很难调试的。
解析后效果：
使用PULL解析XML文件
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