how to backup contacts or sms to SD card as .xml file or .csv file and restore it later

Step 1 To Take Backup

 public ArrayList<String> smsBuffer = new ArrayList<String>();
    String smsFile = "SMS"+".csv";
       private void  backupSMS(){
    smsBuffer.clear();
    Uri mSmsinboxQueryUri = Uri.parse("content://sms");
    Cursor cursor1 = getContentResolver().query(
            mSmsinboxQueryUri,
            new String[] { "_id", "thread_id", "address", "person", "date",
                    "body", "type" }, null, null, null);
    //startManagingCursor(cursor1);
    String[] columns = new String[] { "_id", "thread_id", "address", "person", "date", "body",
            "type" };
    if (cursor1.getCount() > 0) {
        String count = Integer.toString(cursor1.getCount());
        Log.d("Count",count);
        while (cursor1.moveToNext()) {

             String messageId = cursor1.getString(cursor1
                    .getColumnIndex(columns[0]));

             String threadId = cursor1.getString(cursor1
                    .getColumnIndex(columns[1]));

            String address = cursor1.getString(cursor1
                    .getColumnIndex(columns[2]));
            String name = cursor1.getString(cursor1
                    .getColumnIndex(columns[3]));
            String date = cursor1.getString(cursor1
                    .getColumnIndex(columns[4]));
            String msg = cursor1.getString(cursor1
                    .getColumnIndex(columns[5]));
            String type = cursor1.getString(cursor1
                    .getColumnIndex(columns[6]));

            smsBuffer.add(messageId + ","+ threadId+ ","+ address + "," + name + "," + date + " ," + msg + " ,"
                    + type);
        }           
        generateCSVFileForSMS(smsBuffer);
    }               
}

 private void generateCSVFileForSMS(ArrayList<String> list)
{

    try 
    {
        String storage_path = Environment.getExternalStorageDirectory().toString() + File.separator + smsFile;
        FileWriter write = new FileWriter(storage_path);

        write.append("messageId, threadId, Address, Name, Date, msg, type");
        write.append('\n');

        for (String s : list)
        {
            write.append(s);
            write.append('\n');
        }
        write.flush();
        write.close();
    }

    catch (NullPointerException e) 
    {
        System.out.println("Nullpointer Exception "+e);
         //  e.printStackTrace();
     }
    catch (IOException e) 
    {
        e.printStackTrace();
    }
    catch (Exception e) 
    {
        e.printStackTrace();
   }

}

Step 2 take backup Contacts

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

import android.app.Activity;
import android.content.res.AssetFileDescriptor;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.ContactsContract;
import android.util.Log;
import android.view.View;

public class VCardActivity extends Activity 
{
Cursor cursor;
ArrayList<String> vCard ;
String vfile;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    vfile = "Contacts" + "_" + System.currentTimeMillis()+".vcf";
    /**This Function For Vcard And here i take one Array List in Which i store every Vcard String of Every Conatact
     * Here i take one Cursor and this cursor is not null and its count>0 than i repeat one loop up to cursor.getcount() means Up to number of phone contacts.
     * And in Every Loop i can make vcard string and store in Array list which i declared as a Global.
     * And in Every Loop i move cursor next and print log in logcat.
     * */
    getVcardString();

}
private void getVcardString() {
    // TODO Auto-generated method stub
    vCard = new ArrayList<String>();
    cursor = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null, null, null);
    if(cursor!=null&&cursor.getCount()>0)
    {
        cursor.moveToFirst();
        for(int i =0;i<cursor.getCount();i++)
        {
            get(cursor);
            Log.d("TAG", "Contact "+(i+1)+"VcF String is"+vCard.get(i));
            cursor.moveToNext();
        }
    }
    else
    {
        Log.d("TAG", "No Contacts in Your Phone");
    }
}

public void get(Cursor cursor)
{

    //cursor.moveToFirst();
    String lookupKey = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.LOOKUP_KEY));
    Uri uri = Uri.withAppendedPath(ContactsContract.Contacts.CONTENT_VCARD_URI, lookupKey);
    AssetFileDescriptor fd;
    try {
        fd = this.getContentResolver().openAssetFileDescriptor(uri, "r");

        // Your Complex Code and you used function without loop so how can you get all Contacts Vcard.??


       /* FileInputStream fis = fd.createInputStream();
        byte[] buf = new byte[(int) fd.getDeclaredLength()];
        fis.read(buf);
        String VCard = new String(buf);
        String path = Environment.getExternalStorageDirectory().toString() + File.separator + vfile;
        FileOutputStream out = new FileOutputStream(path);
        out.write(VCard.toString().getBytes());
        Log.d("Vcard",  VCard);*/

        FileInputStream fis = fd.createInputStream();
        byte[] buf = new byte[(int) fd.getDeclaredLength()];
        fis.read(buf);
        String vcardstring= new String(buf);
        vCard.add(vcardstring);

        String storage_path = Environment.getExternalStorageDirectory().toString() + File.separator + vfile;
        FileOutputStream mFileOutputStream = new FileOutputStream(storage_path, false);
        mFileOutputStream.write(vcardstring.toString().getBytes());

    } catch (Exception e1) 
    {
        // TODO Auto-generated catch block
        e1.printStackTrace();
    }
}
}

This can be help you to take the Contacts as VCF file. For taking sms backup use this method as same for sms backup.