Android SQL generic constructors

I'm new in SQL Android, and i have a question: I saw a lot of tutorials on how to create databases but they all create a SQLiteOpenHelper for each database's class. Honestly i don't think it is a good idea, because for a DB with lot of tables it will mean a lot of thrash-code.

How can I use a generic type for N classes? I need the CREATE TABLE / DROP TABLE / UPDATE TABLE / etc methods which works for a T class, not for (example) a "USER" class.

Can anyone tell me how to do it? i post a piece of code, but i don't know how to generify it.

USER class:

public class USER{
    private Integer ID;
    private String NAME;
    private String SURNAME;

    public USER(){}
    public USER(String NAME, String SURNAME){
        this.NAME = NAME;
        this.SURNAME = SURNAME;
    }

    //getters and setters
}

DOG class:

public class DOG{
    private Integer ID;
    private String NAME;
    private Integer LEGS_NO;

    public DOG(){}
    public DOG(String NAME, Integer LEGS_NO){
        this.NAME = NAME;
        this.LEGS_NO= LEGS_NO;
    }

    //getters and setters
}

How will a generic SQLiteOpenHelper looks like for working for each of those classes? Thanks in advice