android使用pull解析器读写xml文件…

public class CreatexmlActivity extends Activity {

   

Button btn1;

// OnClickListener ocl1;

    @Override

    public voidonCreate(Bundle savedInstanceState) {

       super.onCreate(savedInstanceState);

       setContentView(R.layout.main);

       btn1=(Button)findViewById(R.id.button1);

       btn1.setOnClickListener(ocl1);

       

    }

    

  public OnClickListener ocl1=newOnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

List<Person> list1=newArrayList<Person>();

Person p1=new Person("shouji",12);

p1.setId(0);

list1.add(p1);

Person p2=new Person("dianhua",22);

p2.setId(new Integer(1));

list1.add(p2);

try {

saveAllByXmlSerializer(list1,new FileOutputStream(newFile("/sdcard/data","b.xml")));

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

List<Person> list2;

try {

list2 = findAll(new FileInputStream(newFile("/sdcard/data","b.xml")));

for(int i=0;i<list2.size();i++)

Toast.makeText(getApplicationContext(),list2.get(i).getName(),Toast.LENGTH_SHORT).show();

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

};

public List<Person>findAll(InputStream in) throws Exception { 

    //获取Pull解析器 

    XmlPullParser parser =Xml.newPullParser(); 

    //解析器加载输入流 

    parser.setInput(in,"UTF-8"); 

 

   List<Person> list = newArrayList<Person>(); 

    Person user =null; 

    for (int event =parser.getEventType(); event != XmlPullParser.END_DOCUMENT; event =parser.next()) 

       switch (event) { 

           caseXmlPullParser.START_TAG: 

              if("person".equals(parser.getName())) { 

                 user = new Person(); 

                 String id =parser.getAttributeValue(0); 

                 user.setId(newInteger(id)); 

                 list.add(user); 

              } else if("name".equals(parser.getName())) { 

                 String name =parser.nextText(); 

                 user.setName(name); 

              } else if("age".equals(parser.getName())) { 

                 String age =parser.nextText(); 

                 user.setAge(newInteger(age)); 

              } 

       } 

 

    returnlist; 

} 

public voidsaveAllByXmlSerializer(List<Person>users, OutputStream out) throws IOException{ 

    XmlSerializer serializer= Xml.newSerializer(); 

   serializer.setOutput(out, "UTF-8"); 

 

   serializer.startDocument("UTF-8", true); 

   serializer.startTag(null, "persons"); 

 

    for (Person user :users) { 

       serializer.startTag(null,"person"); 

       serializer.attribute(null, "id",user.getId().toString()); 

 

       serializer.startTag(null,"name"); 

      serializer.text(user.getName()); 

       serializer.endTag(null,"name"); 

 

       serializer.startTag(null,"age"); 

      serializer.text(String.valueOf(user.getAge())); 

       serializer.endTag(null,"age"); 

 

       serializer.endTag(null,"person"); 

   } 

 

    serializer.endTag(null,"persons"); 

   serializer.endDocument(); 

} 

public class Person {  

    

    private Integer id; 

    private String name; 

    private int age; 

     

    public Person () 

    {} 

    public Person (Stringname ,int age)  

    { 

       this.name = name;  

       this.age = age;  

    } 

    public Integer getId() { 

       return id;  

    } 

    public voidsetId(Integer id) {  

       this.id = id;  

    } 

    public String getName(){  

       return name;  

    } 

    public voidsetName(String name) {  

       this.name = name;  

    } 

    public int getAge() { 

       return age;  

    } 

    public void setAge(intage) {  

       this.age = age;  

    } 

    @Override 

    public String toString(){  

       // TODO Auto-generated method stub 

       return this.id+",name "+this.name+"  age "+this.age+"\n";  

    } 

     

}  

}

创建的xml文件如下：

<?xml version='1.0' encoding='UTF-8'standalone='yes'?><persons><personid="0"><name>shouji</name><age>12</age></person><personid="1"><name>dianhua</name><age>22</age></person></persons>

大家会发现这个xml文件和我们平常使用的xml文件有所差别，请仔细看！

发现没有，<?xml version='1.0'encoding='UTF-8' standalone='yes'?>这个中间的是单引号，而我们平常使用的是双引号<?xmlversion="1.0"encoding="utf-8"?>，这个怎么办呢？下期解决。