I am not able to store large string in Xml file to my sd card

I backed up all inbox messages from my device and I tried to save it to a xml file. But the string limit is too high. So it not converting to xml file. But when I limit the for loop to 100, Then the xml file is converted and saved to my card.

package com.example.readmessages;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStreamWriter;
import java.io.StringReader;
import java.io.StringWriter;
import java.util.ArrayList;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.apache.http.util.ByteArrayBuffer;
import org.w3c.dom.Document;
import org.xml.sax.InputSource;
import org.xmlpull.v1.XmlSerializer;

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

public class MainActivity extends Activity {
    ArrayList<String> number = new ArrayList<String>();
    ArrayList<String> msg = new ArrayList<String>();
    ArrayList<String> all = new ArrayList<String>();

    ArrayList<String> phone1;
    ArrayList<String> name1;
    String phone2, name2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        name1 = new ArrayList<String>();
        phone1 = new ArrayList<String>();

        Uri inboxURI = Uri.parse("content://sms/inbox");

        String[] reqCols = new String[] { "_id", "address", "body" };

        ContentResolver cr = getContentResolver();

        Cursor cursor = cr.query(inboxURI, reqCols, null, null, null);

        if (cursor.moveToFirst()) { // must check the result to prevent
                                    // exception
            do {
                // String msgData = "";
                for (int i = 0; i < cursor.getColumnCount(); i++) {

                    String body = cursor.getString(2);

                    msg.add(body);

                    System.out.println("MESSAGE:::" + msg);

                }

                System.out.println("!!!!!!!!!!" + msg.size());
                System.out.println("##############" + msg);

                // use msgData
            } while (cursor.moveToNext());
        } else {
            // empty box, no SMS
            System.out.println("inbox is empty");
        }

        // //////////////////////MOVE TO SD CARD/////////////////////////

        try {

            String xmlRecords = "<Parent>";

            for (int x = 0; x < number.size(); x++) {

                xmlRecords = xmlRecords + "<message>" + number.get(x)
                        + "</message>";
            }

            xmlRecords = xmlRecords + "</Parent>";

            System.out.println(xmlRecords);

            DocumentBuilderFactory factory = DocumentBuilderFactory
                    .newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document d1 = builder.parse(new InputSource(new StringReader(
                    xmlRecords)));

            ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
            Source xmlSource = new DOMSource(d1);
            Result outputTarget = new StreamResult(outputStream);
            TransformerFactory.newInstance().newTransformer()
                    .transform(xmlSource, outputTarget);
            InputStream is = new ByteArrayInputStream(
                    outputStream.toByteArray());
            BufferedInputStream bis = new BufferedInputStream(is);

            String fileName = "common.txt";
            File destinationFile = new File("/sdcard/" + fileName);
            BufferedOutputStream buffer = new BufferedOutputStream(
                    new FileOutputStream(destinationFile));

            byte byt[] = new byte[1024];
            int i;
            for (long l = 0L; (i = is.read(byt)) != -1; l += i) {
                buffer.write(byt, 0, i);
            }
            buffer.close();
        } catch (Exception e) {

                    }
    }
}