Database doesn't fill at the first time

I'm going to get some data from server via JSON and store them in my sqlite database.

When I use below code, at the first time, Toast message shows me that my table rows is zero.

But when I run my application for the second time, it shows me the currect number (JSON data count).

Also, at the second time, I remove lines that they store data to sqlite database and run app in order to sure that at the first time data was stored in database.

Please let me know where I'm wrong ...

AboutActivity:

public class AboutActivity extends ActionBarActivity implements OnClickListener, OnItemClickListener {

DBHandler dbh;
private static final String TAG_IMAGES = "images";
private static final String TAG_GUID = "GUID";
private static final String TAG_IMG_LINK = "img_link";
private static final String TAG_IMG_DESC = "img_desc";
private static final String TAG_URL = "http://xxx/x.php";
private JSONArray jArray = null;
private JSONParser jParser;
private JSONObject jObject;
private ProgressDialog pDialog;

String[] GUID;
String[] imgLink;
String[] imgDesc;
String[] imgPath;
AboutSlideShowModel model;

@Override
protected void onCreate(Bundle savedInstanceState) 
{
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_about);

    dbh = new DBHandler(AboutActivity.this);

    getAllDataFromServer myClass =  new getAllDataFromServer();
    myClass.execute();
    Toast.makeText(AboutActivity.this, dbh.getCount() + "", 5000).show();
}

private class getAllDataFromServer extends AsyncTask<Void, Void, Void>
{
    @Override
    protected void onPreExecute() 
    {
        pDialog = new ProgressDialog(AboutActivity.this);
        pDialog.setMessage("Be patient ...");
        pDialog.show();
        super.onPreExecute();
    }

    @Override
    protected Void doInBackground(Void... params) 
    {
        jParser = new JSONParser();
        jObject = jParser.getJSONFromUrl(TAG_URL);
        try
        {
            jArray = jObject.getJSONArray(TAG_IMAGES);
            GUID = new String[jArray.length()];
            imgLink = new String[jArray.length()];
            imgPath = new String[jArray.length()];
            imgDesc = new String[jArray.length()];
            for(int i=0; i<jArray.length(); i++)
            {
                JSONObject tempJson = jArray.getJSONObject(i);
                GUID[i] = tempJson.getString(TAG_GUID);
                imgLink[i] = tempJson.getString(TAG_IMG_LINK);
                imgDesc[i] = tempJson.getString(TAG_IMG_DESC);
                new SaveImageIntoStorage(AboutActivity.this, imgLink[i], GUID[i] + ".jpg", "SlideShow").saveImage();
                imgPath[i] = Environment.getExternalStorageDirectory() + "/Slideshow/" + GUID[i] + ".jpg";
                model = new AboutSlideShowModel(GUID[i], imgLink[i], imgPath[i], imgDesc[i]);
                dbh.insertSingleAboutSlideShow(model);
            }
        }
        catch(JSONException e)
        {
            e.printStackTrace();
        }
        return null;
    }

    @Override
    protected void onPostExecute(Void result) 
    {
        pDialog.dismiss();
        super.onPostExecute(result);
    }
    }
}

AboutSlideShowModel:

public class AboutSlideShowModel 
{
public int ID;
public String GUID;
public String IMG_LINK;
public String IMG_PATH;
public String Description;

public AboutSlideShowModel() {}

public AboutSlideShowModel(int ID, String GUID, String IMG_LINK, String    IMG_PATH, String Description)
{
    this.GUID = GUID;
    this.IMG_LINK = IMG_LINK;
    this.IMG_PATH = IMG_PATH;
    this.Description = Description;
    this.ID = ID;
}

public AboutSlideShowModel(String GUID, String IMG_LINK, String IMG_PATH, String Description)
{
    this.GUID = GUID;
    this.IMG_LINK = IMG_LINK;
    this.IMG_PATH = IMG_PATH;
    this.Description = Description;
}

public void setID(int ID)
{
    this.ID = ID;
}

public void setGUID(String GUID)
{
    this.GUID = GUID;
}

public void setIMG_LINK(String IMG_LINK)
{
    this.IMG_LINK = IMG_LINK;
}

public void setIMG_PATH(String IMG_PATH)
{
    this.IMG_PATH = IMG_PATH;
}

public void setDescription(String Description)
{
    this.Description = Description;
}

public int getID()
{
    return this.ID;
}

public String getGUID()
{
    return this.GUID;
}

public String getIMG_LINK()
{
    return this.IMG_LINK;
}

public String getIMG_PATH()
{
    return this.IMG_PATH;
}

public String getDescription()
{
    return this.Description;
}
}

DBHandler:

public class DBHandler extends SQLiteOpenHelper 
{
private static final String DB_NAME = "db";
private static final int DB_VERSION = 1;

private static final String KEY_ID = "id";
private static final String KEY_GUID = "guid";
private static final String KEY_IMAGE_PATH = "image_path";
private static final String KEY_IMAGE_LINK = "image_link";
private static final String KEY_DESCRIPTION = "description";

private static final String TBL_ABOUT_SLIDESHOW = "tbl_about_slideshow";

private static final String CREATE_TBL_ABOUT_SLIDESHOW = "CREATE TABLE IF NOT EXISTS "
        + TBL_ABOUT_SLIDESHOW + "("
        + KEY_ID + " INTEGER PRIMARY KEY AUTOINCREMENT,"
        + KEY_GUID + " TEXT," 
        + KEY_IMAGE_LINK + " TEXT," 
        + KEY_IMAGE_PATH + " TEXT," 
        + KEY_DESCRIPTION + " TEXT" + ")";

public DBHandler(Context context) 
{
    super(context, DB_NAME, null, DB_VERSION);
}

@Override
public void onCreate(SQLiteDatabase db) 
{
    db.execSQL(CREATE_TBL_ABOUT_SLIDESHOW);
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) 
{
    db.execSQL("DROP TABLE IF EXISTS " + TBL_ABOUT_SLIDESHOW);
    onCreate(db);
}

public void insertSingleAboutSlideShow(AboutSlideShowModel model)
{
    SQLiteDatabase db = this.getWritableDatabase();
    ContentValues values = new ContentValues();
    values.put(KEY_GUID, model.getGUID());
    values.put(KEY_IMAGE_LINK, model.getIMG_LINK());
    values.put(KEY_IMAGE_PATH, model.getIMG_PATH());
    values.put(KEY_DESCRIPTION, model.getDescription());
    // Inserting Row
    db.insert(TBL_ABOUT_SLIDESHOW, null, values);
    db.close(); // Closing database connection
}
public int getCount()
{
    SQLiteDatabase db = this.getReadableDatabase();
    Cursor c = db.rawQuery("SELECT * FROM " + TBL_ABOUT_SLIDESHOW, null);
    if(c.getCount() <= 0)
        return 0;
    return c.getCount();
}
}