exemplo_flutter_drawer_expansion.dart

Drawer(
            child: ListView(
              padding: EdgeInsets.zero,
              children: <Widget>[
                DrawerHeader(
                  child: Text('Cabeçalho'),
                  decoration: BoxDecoration(
                    color: Colors.blue,
                  ),
                ),
                ListTile(
                  title: Text('Item 1'),
                  selected: 0 == _selectedIndex,
                  onTap: () {
                    _onSelectItem(0);
                  },
                ),
                ListTile(
                  title: Text('Item 2'),
                  selected: 1 == _selectedIndex,
                  onTap: () {
                    _onSelectItem(1);
                  },
                ),
                ExpansionTile(
                  title: Text("Expansion Title"),
                  children: <Widget>[
                    InkWell(
                      child: Row(
                        mainAxisSize: MainAxisSize.max,
                        children: [
                          Padding(
                            padding: const EdgeInsets.all(18),
                            child: Text("children 1")),
                        ],
                      ),
                      onTap: (){
                        print("children 1");
                      },
                    ),
                   InkWell(
                      child: Row(
                        mainAxisSize: MainAxisSize.max,
                        children: [
                          Padding(
                            padding: const EdgeInsets.all(18),
                            child: Text("children 2")),
                        ],
                      ),
                      onTap: (){
                        print("children 2");
                      },
                    ),
                   ],
                )
              ],
            ),
          ),