Export Android Contacts to XML File? -

as little school project, i'm trying create simple export application android. @ first, want exported contact list - , import device. have 2 devices testing - 1 running 2.2.3 , running 4.0.4.

i've been playing around following pieces of code accomplish getting contacts information, , saving xml file external storage:

package com.example.contacts;  import java.util.arraylist;     import android.os.bundle; import android.provider.contactscontract; import android.app.activity; import android.content.contentresolver; import android.database.cursor; import android.util.log; import android.view.menu;   public class mainactivity extends activity {  string num = "nope";  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      getcontacts();   }  @override public boolean oncreateoptionsmenu(menu menu) {     // inflate menu; adds items action bar if present.     getmenuinflater().inflate(r.menu.main, menu);     return true; }     public string getcontacts() {   contentresolver cr = getcontentresolver(); cursor cur = cr.query(contactscontract.contacts.content_uri,         null, null, null, null); if (cur.getcount() > 0) {     while (cur.movetonext()) {           string id = cur.getstring(cur.getcolumnindex(contactscontract.contacts._id));           string con = cur.getstring(cur.getcolumnindex(contactscontract.contacts.display_name));           if (integer.parseint(cur.getstring(                 cur.getcolumnindex(contactscontract.contacts.has_phone_number))) > 0) {              cursor pcur = cr.query(                        contactscontract.commondatakinds.phone.content_uri,                        null,                        contactscontract.commondatakinds.phone.contact_id +" = ?",                        new string[]{id}, null);              while (pcur.movetonext()) {                  string num =             pcur.getstring(pcur.getcolumnindex(contactscontract.commondatakinds.phone.number));                  log.d("contacts: ", "name: " + con + ", number: " + num);                  return num;              }             pcur.close();         }     } } return num;  }   } 

this code prints contacts log.

the next code creates xml file @ device's external storage (sd card) - taken http://www.anddev.org/write_a_simple_xml_file_in_the_sd_card_using_xmlserializer-t8350.html:

package com.example.contacts;  import java.io.file; import java.io.filenotfoundexception; import java.io.fileoutputstream; import java.io.ioexception;  import org.xmlpull.v1.xmlserializer;  import android.app.activity; import android.os.bundle; import android.os.environment; import android.util.log; import android.util.xml; import android.widget.textview;  public class xmlfilecreator extends activity { @override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.main);     //create new file called "new.xml" in sd card     file newxmlfile = new file(environment.getexternalstoragedirectory()+"/new.xml");     try{             newxmlfile.createnewfile();     }catch(ioexception e){             log.e("ioexception", "exception in createnewfile() method");     }     //we have bind new file fileoutputstream     fileoutputstream fileos = null;             try{             fileos = new fileoutputstream(newxmlfile);     }catch(filenotfoundexception e){             log.e("filenotfoundexception", "can't create fileoutputstream");     }     //we create xmlserializer in order write xml data     xmlserializer serializer = xml.newserializer();     try {             //we set fileoutputstream output serializer, using utf-8 encoding                     serializer.setoutput(fileos, "utf-8");                     //write <?xml declaration encoding (if encoding not null) , standalone     flag (if standalone not null)                     serializer.startdocument(null, boolean.valueof(true));                     //set indentation option                     serializer.setfeature("http://xmlpull.org/v1/doc/features.html#indent-    output", true);                     //start tag called "root"                     serializer.starttag(null, "root");                     //i indent code have view similar xml-tree                             serializer.starttag(null, "child1");                             serializer.endtag(null, "child1");                              serializer.starttag(null, "child2");                             //set attribute called "attribute" "value" <child2>                             serializer.attribute(null, "attribute", "value");                             serializer.endtag(null, "child2");                              serializer.starttag(null, "child3");                             //write text inside <child3>                             serializer.text("some text inside child3");                             serializer.endtag(null, "child3");                      serializer.endtag(null, "root");                     serializer.enddocument();                     //write xml data fileoutputstream                     serializer.flush();                     //finally close file stream                     fileos.close();              textview tv = (textview)this.findviewbyid(r.id.result);                     tv.settext("file has been created on sd card");             } catch (exception e) {                     log.e("exception","error occurred while creating xml file");             }     } } 

now, question follows: how 1 proceed add strings of contacts xml file? guess have add tags this:

starttag: contacts starttag: name :endtag starttag: number :endtag : endtag

but how can write these contact details child tags of first "contacts" tag? reference lovely.

i make life easier , not write xml 'string' myself use serializer simple, have @ examples , reference, it's easy use.