Good practices with bd Android contract [closed]

What would be the good practices regarding sqlite on Android? I use a single db contract for all tables (each table a class inside the main contract class)?

public final class FeedReaderContract {
    // To prevent someone from accidentally instantiating the contract class,
    // make the constructor private.
    private FeedReaderContract() {}

    /* Inner class that defines the table contents */
    public static class FeedEntry implements BaseColumns {
        public static final String TABLE_NAME = "entry";
        public static final String COLUMN_NAME_TITLE = "title";
        public static final String COLUMN_NAME_SUBTITLE = "subtitle";
    }

    public static class OutraTabela implements BaseColumns {
     ....
    }
}

Or do I create a contract class for each table?