Android Notification sqlite auto refresh?

i am building a chat application using push notification and it is working well but the problem is when a new message comes in it gets stored int the sqlite but does not refresh in the chat class until i go to the previous class and then back to the chat class before it shows. i don't want to refresh the chatting class every second is their a way to make the database refresh when a new message comes? .When am on chatting.java class and a notification message comes i want the sqlite database to auto refresh. i have succeed in making it save

this is the notification class

package com.mall.first;


import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.Dialog;
import android.app.IntentService;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.database.Cursor;
import android.os.AsyncTask;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.v4.app.NotificationCompat;
import android.util.Log;
import android.widget.ListView;
import android.widget.Toast;


import com.google.android.gms.gcm.GoogleCloudMessaging;
import com.mall.dbs.ContactListAdapter;
import com.mall.dbs.ContactListItems;
import com.mall.dbs.SqlHandler;
import com.mall.our.Chatting;

public class GCMNotificationIntentService extends IntentService {
    // Sets an ID for the notification, so it can be updated
    public static final int notifyID = 9001;
    NotificationCompat.Builder builder;
    Dialog pDialog;
    int flag = 0;


    SqlHandler sqlHandler;
    ListView lv;

    private static final String TAG_SUCCESS = "success";
    private static final String url = "http://ift.tt/1cBzOGX";

    ArrayList<ContactListItems> contactList = new ArrayList<ContactListItems>();
    JSONParser jsonParser = new JSONParser();
    public GCMNotificationIntentService() {
        super("GcmIntentService");

    }
    @Override
    protected void onHandleIntent(Intent intent) {
        Bundle extras = intent.getExtras();
        lv= getListView();
        lv.setDivider(null);
    sqlHandler = new SqlHandler(this);
        GoogleCloudMessaging gcm = GoogleCloudMessaging.getInstance(this);

        String messageType = gcm.getMessageType(intent);

        if (!extras.isEmpty()) {
            if (GoogleCloudMessaging.MESSAGE_TYPE_SEND_ERROR
                    .equals(messageType)) {
                sendNotification("Send error: " + extras.toString(), "");
            } else if (GoogleCloudMessaging.MESSAGE_TYPE_DELETED
                    .equals(messageType)) {
                sendNotification("Deleted messages on server: "
                        + extras.toString(), "");
            } else if (GoogleCloudMessaging.MESSAGE_TYPE_MESSAGE
                    .equals(messageType)) {
                sendNotification(""
                        + extras.get(ApplicationConstants.MSG_KEY),""
                                + extras.get(ApplicationConstants.NAME_KEY));
            }
        }
        GcmBroadcastReceiver.completeWakefulIntent(intent);
    }

    private void sendNotification(final String msg,final String names) {
            Intent resultIntent = new Intent(this, MainActivity.class);
            resultIntent.putExtra("msg", msg);
            resultIntent.putExtra("names", names);
            SqlHandler sqlHandler = new SqlHandler(this);
            SharedPreferences sp = PreferenceManager
                    .getDefaultSharedPreferences(this);
            String post_username = sp.getString("username", "anon");
            String query = "INSERT INTO PHONE_CONTACTS(froms,message,too) values ('"+ names+ "','" + msg + "','" + post_username + "')";
            sqlHandler.executeQuery(query);
            String time = "fdd";


            PendingIntent resultPendingIntent = PendingIntent.getActivity(this, 0,
                    resultIntent, PendingIntent.FLAG_ONE_SHOT);

            NotificationCompat.Builder mNotifyBuilder;
            NotificationManager mNotificationManager;

            mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

            mNotifyBuilder = new NotificationCompat.Builder(this)
                    .setContentTitle("Alert")
                    .setContentText("You've received new message.")
                    .setSmallIcon(R.drawable.ic_launcher);
            // Set pending intent
            mNotifyBuilder.setContentIntent(resultPendingIntent);

            // Set Vibrate, Sound and Light            
            int defaults = 0;
            defaults = defaults | Notification.DEFAULT_LIGHTS;
            defaults = defaults | Notification.DEFAULT_VIBRATE;
            defaults = defaults | Notification.DEFAULT_SOUND;

            mNotifyBuilder.setDefaults(defaults);
            // Set the content for Notification 
            mNotifyBuilder.setContentText("New message from "+names);
            // Set autocancel
            mNotifyBuilder.setAutoCancel(true);
            // Post a notification
            mNotificationManager.notify(notifyID, mNotifyBuilder.build());
    }
    private void showlist() {


         SharedPreferences sp = PreferenceManager
                    .getDefaultSharedPreferences(this);
            String friend = sp.getString("value", "anon");
        ArrayList<ContactListItems> contactList = new ArrayList<ContactListItems>();
        contactList.clear();
        String query = "SELECT * FROM PHONE_CONTACTS";
        Cursor c1 = sqlHandler.selectQuery(query);
        if (c1 != null && c1.getCount() != 0) {
            if (c1.moveToFirst()) {
                do {
                    ContactListItems contactListItems = new ContactListItems();

                    contactListItems.setFrom(c1.getString(c1
                            .getColumnIndex("state")));
                    contactListItems.setSlno(c1.getString(c1
                            .getColumnIndex("time")));
                    contactListItems.setName(c1.getString(c1
                            .getColumnIndex("froms")));
                    contactListItems.setPhone(c1.getString(c1
                            .getColumnIndex("message")));
                    contactList.add(contactListItems);

                } while (c1.moveToNext());
            }
        }
        c1.close();

        ContactListAdapter contactListAdapter = new ContactListAdapter(
                this, contactList);

             contactListAdapter.notifyDataSetChanged();

    }

}

this is my database class

package com.mall.dbs;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;

public class SqlDbHelper extends SQLiteOpenHelper {
    public static final String DATABASE_TABLE = "PHONE_CONTACTS";
    public static final String COLUMN1 = "slno";
    public static final String COLUMN2 = "froms";
    public static final String COLUMN3 = "message";
    public static final String COLUMN4 = "too";
    public static final String COLUMN5 = "time";
    public static final String COLUMN6 = "state";
    public static final String KEY_TIMESTAMP = "timestampColumn";
    private static final String SCRIPT_CREATE_DATABASE = "create table "
            + DATABASE_TABLE + " (" + COLUMN1
            + " integer primary key autoincrement, " + COLUMN2
            + " text not null, " + COLUMN3 + " text, " + COLUMN4 + " text, " + COLUMN5 + " TIMESTAMP DEFAULT CURRENT_TIMESTAMP, " + COLUMN6 + " text);";

    /*private static final String SCRIPT_CREATE_DATABASE = "CREATE TABLE "+DATABASE_TABLE+"  (slno integer primary key autoincrement,from TEXT," +
        "message TEXT,too TEXT,time VARCHAR)";
        */
    public SqlDbHelper(Context context, String name, CursorFactory factory,
            int version) {
        super(context, name, factory, version);
        // TODO Auto-generated constructor stub

    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        // TODO Auto-generated method stub
        db.execSQL(SCRIPT_CREATE_DATABASE);

    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // TODO Auto-generated method stub
        db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE);
        onCreate(db);
    }

}

the database helper class

package com.mall.dbs;

import java.util.ArrayList;
import java.util.HashMap;

import android.content.Context;
import android.content.SharedPreferences;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.preference.PreferenceManager;

public class SqlHandler {

    public static final String DATABASE_NAME = "MY_DATABASE";
    public static final int DATABASE_VERSION = 1;
    Context context;
    SQLiteDatabase sqlDatabase;
    SqlDbHelper dbHelper;

    public SqlHandler(Context context) {

        dbHelper = new SqlDbHelper(context, DATABASE_NAME, null,
                DATABASE_VERSION);
        sqlDatabase = dbHelper.getWritableDatabase();
    }

    public void executeQuery(String query) {
        try {

            if (sqlDatabase.isOpen()) {
                sqlDatabase.close();
            }

            sqlDatabase = dbHelper.getWritableDatabase();
            sqlDatabase.execSQL(query);

        } catch (Exception e) {

            System.out.println("DATABASE ERROR " + e);
        }

    }

    public Cursor selectQuery(String query) {
        Cursor c1 = null;
        try {

            if (sqlDatabase.isOpen()) {
                sqlDatabase.close();

            }
            sqlDatabase = dbHelper.getWritableDatabase();
            c1 = sqlDatabase.rawQuery(query, null);

        } catch (Exception e) {

            System.out.println("DATABASE ERROR " + e);

        }
        return c1;

    }
    public void deleteContact(){

        sqlDatabase = dbHelper.getWritableDatabase();

        String deleteQuery = "DELETE FROM PHONE_CONTACTS ";

        sqlDatabase.execSQL(deleteQuery);

    }
}