Android – sqlite date query

I am new sqlite. I have one table that having 3 columns

1. Id
2. FoodName
3. Date and time

(ex: '1' 'Chicken' '2012-08-10 13:54') 

I read somewhere Android sqlite doesn't provide date data type.

So I used the text data type for storing the date in local db. it's working fine.

Now I want to write a query for retrieving the record between two dates. I tried but I am not getting it.

==>> code

public class FoodDB {

//Database Related Constants
public static final String KEY_ROWID = "id";
public static final String KEY_NAME = "fooditem";
public static final String KEY_TIMESTAMP = "timestamp";   

private static final String DATABASE_NAME = "AJFoodDB";
private static final String DATABASE_TABLE = "AJ_Food";
private static final int DATABASE_VERSION = 1;

Cursor c;
long id;

private static final String DATABASE_CREATE =
    "create table "+DATABASE_TABLE+" (id integer primary key autoincrement, "               
     + KEY_NAME+" text not null,"
     + KEY_TIMESTAMP+" text not null);";

private  final Context context;
private DatabaseHelper DBHelper;
private SQLiteDatabase sqlitedatabase;

public FoodDB(Context ctext){
    context = ctext;        
}

private static class DatabaseHelper extends SQLiteOpenHelper
{
    DatabaseHelper(Context context)
    {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    public void onCreate(SQLiteDatabase db)
    {
        db.execSQL(DATABASE_CREATE);                     
    }

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

//Insert Row
public void insertSSFiltersDetails(String keyname, String timestamp){
    try 
    {
        DBHelper = new DatabaseHelper(context);
        sqlitedatabase = DBHelper.getWritableDatabase();
        insertRow(keyname, timestamp);    
        sqlitedatabase.close();

    } catch (Exception e) {
        System.out.println("Error from inserting data->"+e.toString());
    }
}

public long insertRow(String keyname, String timestamp){
    ContentValues initialValues = new ContentValues();
    initialValues.put(KEY_NAME, keyname);
    initialValues.put(KEY_TIMESTAMP, timestamp);       
    return sqlitedatabase.insert(DATABASE_TABLE, null, initialValues);
}

//Close Data Base
public void closeDBHelper(){
    if(DBHelper != null){
        DBHelper.close();
    }       
    if (c != null) {
        c.close();
        c = null;
    }
}       }

Query and Table
select * from AJ_Food;

1|rice   |8/12/2011 16:11
2|Rice   |8/13/2012 11:42
3|chicken|8/13/2012 11:42
4|Prawans|8/13/2012 11:43