package com.ithaimazyh.readcontact;

 import java.util.ArrayList;

 import java.util.List;

 import com.ithaimazyh.readcontact.domain.PersonInfo;

 import com.ithaimazyh.readcontact.service.SavePersonsInfo;

 import android.net.Uri;

 import android.os.Bundle;

 import android.app.Activity;

 import android.content.ContentResolver;

 import android.database.Cursor;

 import android.view.Menu;

 import android.view.View;

 import android.view.View.OnClickListener;

 import android.widget.Button;

 public class MainActivity extends Activity {

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);

         Button rp = (Button) findViewById(R.id.rp);

         rp.setOnClickListener(new OnClickListener() {

             @Override

             public void onClick(View v) {

                 // TODO Auto-generated method stub

                 //System.out.println("hello world");

                 readContact();

             }

         });

     }

     public void readContact(){

         Uri uri = Uri.parse("content://com.android.contacts/raw_contacts");

         Uri data_uri = Uri.parse("content://com.android.contacts/data");

         ContentResolver resolver = getContentResolver();

         Cursor cursor = resolver.query(uri, null, null, null, null);

         /*String[] names = cursor.getColumnNames();

         for(String name : names){

             System.out.println(name);

         }*/

         List<PersonInfo> persons = new ArrayList<PersonInfo>();

         while(cursor.moveToNext()){

             String contact_id = cursor.getString(cursor.getColumnIndex("contact_id"));

             if(contact_id != null){

                 String name = "";

                 String phoneNum = "";

                 Cursor datacursor = resolver.query(data_uri, null, "raw_contact_id=?", new String[]{contact_id}, null);

                 while(datacursor.moveToNext()){

                     String data1 = datacursor.getString(datacursor.getColumnIndex("data1"));

                     String mimetype = datacursor.getString(datacursor.getColumnIndex("mimetype"));

                     //System.out.println(data1 + "-----" + mimetype);

                     if(mimetype.equals("vnd.android.cursor.item/name")){

                         name = data1;

                     }else if(mimetype.equals("vnd.android.cursor.item/phone_v2")){

                         phoneNum = data1;

                     }else{

                     }

                 }

                 if(name != null && phoneNum != null){

                     PersonInfo person = new PersonInfo(name,phoneNum);

                     persons.add(person);

                 }

                 datacursor.close();

                 //System.out.print("=========================");

             }

         }

         cursor.close();

         SavePersonsInfo.savePersonsInfo(this, persons);

     /*    Cursor datacursor = resolver.query(data_uri, null, null, null, null);

         String[] names = datacursor.getColumnNames();

         for(String name : names){

             System.out.println(name);

         }*/

     }

 }

  <uses-permission android:name="android.permission.READ_CONTACTS"/>

    <uses-permission android:name="android.permission.WRITE_CONTACTS"/>

 package com.ithaimazyh.readcontact.service;

 import java.io.File;

 import java.io.FileNotFoundException;

 import java.io.FileOutputStream;

 import java.util.List;

 import org.xmlpull.v1.XmlSerializer;

 import com.ithaimazyh.readcontact.domain.PersonInfo;

 import android.content.Context;

 import android.os.Environment;

 import android.util.Xml;

 import android.widget.Toast;

 public class SavePersonsInfo {

     public static boolean savePersonsInfo(Context context, List<PersonInfo> persons){

         if(persons.size() > 0){

             try {

                 File file = new File(Environment.getExternalStorageDirectory(),"persons.xml");

                 FileOutputStream fos = new FileOutputStream(file);

                 XmlSerializer serializer = Xml.newSerializer();

                 serializer.setOutput(fos, "utf-8");

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

                 serializer.startTag(null, "persons");

                 for(PersonInfo person : persons){

                     serializer.startTag(null, "person");

                     serializer.startTag(null, "name");

                     serializer.text(person.getName());

                     serializer.endTag(null, "name");

                     serializer.startTag(null, "phoneNum");

                     serializer.text(person.getPhoneNum());

                     serializer.endTag(null, "phoneNum");

                     serializer.endTag(null, "person");

                 }

                 serializer.endTag(null, "persons");

                 serializer.endDocument();

                 fos.close();

                 Toast.makeText(context, "保存xml成功", 0).show();

             } catch (Exception e) {

                 // TODO Auto-generated catch block

                 e.printStackTrace();

                 Toast.makeText(context, "保存xml失败", 0).show();

             }

         }

         return true;

     }

 }

 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

 package com.ithaimazyh.readcontact.domain;

 public class PersonInfo {

     private String name;

     private String phoneNum;

     public PersonInfo() {

     }

     public PersonInfo(String name, String phoneNum) {

         this.name = name;

         this.phoneNum = phoneNum;

     }

     public String getName() {

         return name;

     }

     public void setName(String name) {

         this.name = name;

     }

     public String getPhoneNum() {

         return phoneNum;

     }

     public void setPhoneNum(String phoneNum) {

         this.phoneNum = phoneNum;

     }

 }

String[] columnNames = datacursor.getColumnNames();