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public Boolean isFollowing(int category_id) {

    SQLiteDatabase database = open();
    Long num;

    try {
        num = DatabaseUtils.queryNumEntries (database, favoriteHelper.FAV_TABLE_NAME,
                favoriteHelper.FAV_COLUMN_CATEGORY_ID + "=" + category_id, null);
    }
    finally {
        close(database);
    }

    return (num == 1) ? true : false;
}