Map<int, String> listItemな値をchildren化 static const Map<int, String> firstDate = { 1: 'hoge', 2: 'bar', 3: 'fuge', }; をchildren:へ流し込む listItem .map( (index, kind) => MapEntry<int, Widget>( index, Container(), ), ) .values .toList(), Wrap( children: ここ ),</int,></int,></int,>