ContentResolver获取SMS卡的信息记录，xml序列化

游标cursor的get不是一定要用int   都用string也是可以的
因为在数据库里面全部都是string  只不过是说自己知道什么类型，用getInt就不用自己再去转化一次

通过XmlSerializer对xml进行序列化到本地。

package com.heima.sms;

import java.io.File;
import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.List;

import org.xmlpull.v1.XmlSerializer;

import com.heima.sms.entites.SmsInfo;

import android.app.Activity;
import android.content.ContentResolver;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.util.Xml;
import android.view.View;
import android.widget.Toast;

public class SMSActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main2);
    }
    
    //Button按钮
    public void backupSms(View v){
    	//查处所有短信
    	Uri uri = Uri.parse("content://sms");
    	ContentResolver resolver = getContentResolver();
    	Cursor cursor = resolver.query(uri, new String[]{"_id","address","date","type","body"}, null, null, null);
    	if(cursor!=null && cursor.getCount()>0){
    		List<SmsInfo> smsList = new ArrayList<SmsInfo>();
    		SmsInfo sms;
    		while(cursor.moveToNext()){
    			sms = new SmsInfo();
    			//get不是一定要用int   都用string也是可以的
    			//因为在数据库里面全部都是string  只不过是说自己知道什么类型，用getInt就不用自己再去转化一次
    			sms.setId(cursor.getInt(0)); 
    			sms.setAddress(cursor.getString(1));
    			sms.setDate(cursor.getLong(2));
    			sms.setType(cursor.getInt(3));  //短信的类型，接收是1  发送是2
    			sms.setBody(cursor.getString(4));
    			smsList.add(sms);
    		}
    		cursor.close();
    		//序列化存在本地 
    		writeToLocal(smsList);
    	}
    }

	private void writeToLocal(List<SmsInfo> smsList) {
		// TODO Auto-generated method stub
		
		try {
			XmlSerializer serializer = Xml.newSerializer(); //得到序列化对象
			FileOutputStream fos = new FileOutputStream(new File(
					Environment.getExternalStorageDirectory().getPath(), "sms.xml"));
					serializer.setOutput(fos, "utf-8");
			serializer.startDocument("utf-8", true);
			
			serializer.startTag(null, "smss");
			
			for(SmsInfo smsInfo : smsList){
				serializer.startTag(null, "sms");
				
				serializer.attribute(null, "id", smsInfo.getId()+"");
				
				serializer.startTag(null, "address");
				serializer.text(smsInfo.getAddress());
				serializer.endTag(null, "address");
				
				serializer.startTag(null, "date");
				serializer.text(String.valueOf(smsInfo.getDate()));
				serializer.endTag(null, "date");
				
				serializer.startTag(null, "type");
				serializer.text(String.valueOf(smsInfo.getType()));
				serializer.endTag(null, "type");
				
				serializer.startTag(null, "body");
				serializer.text(smsInfo.getBody());
				serializer.endTag(null, "body");
				
				serializer.endTag(null, "sms");
			}
			
			serializer.endTag(null, "smss");
			
			serializer.endDocument();
			
			Toast.makeText(this, "备份成功", 0).show();
		} catch (Exception e) {
			// TODO: handle exception
			Toast.makeText(this, "备份失败", 0).show();
		}
	}
}

读外部sd卡和sms信息的权限

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