Android : How to declare a variable of a class extending SQLiteOpenHelper in a fragment?

I must declare the following variable in a class extending Fragment:

public class CarrelloFragment  extends Fragment {

DatabaseHelper sqLite=new DatabaseHelper(this); //here is the error

The constructor of DatabaseHelper class does not allow to do this with a fragment.

Here is the code of the constructor of DatabaseHelper class that extends SQLiteOpenHelper:

public class DatabaseHelper extends SQLiteOpenHelper { private static final String DATABASE_NAME = "MySupermarket.db";

private static final int SCHEMA_VERSION = 2;

public DatabaseHelper(Context context) {
    super(context, DATABASE_NAME, null, SCHEMA_VERSION);
}