Flutter:在选择同一页面中的过滤器时刷新列表API

List<String> data = ['Item 1', 'Item 2', 'Item 3', 'Item 4'];

DropdownButton<String>(
  value: selectedFilter,
  onChanged: (value) {
    setState(() {
      selectedFilter = value;
    });
  },
  items: [
    DropdownMenuItem(value: 'Filter 1', child: Text('Filter 1')),
    DropdownMenuItem(value: 'Filter 2', child: Text('Filter 2')),
    DropdownMenuItem(value: 'Filter 3', child: Text('Filter 3')),
  ],
)

void applyFilter(String filter) {
  setState(() {
    if (filter == 'Filter 1') {
      data = ['Filtered Item 1', 'Filtered Item 2'];
    } else if (filter == 'Filter 2') {
      data = ['Filtered Item 3', 'Filtered Item 4'];
    } else if (filter == 'Filter 3') {
      data = ['Filtered Item 5', 'Filtered Item 6'];
    }
  });
}

ListView.builder(
  itemCount: data.length,
  itemBuilder: (context, index) {
    return ListTile(
      title: Text(data[index]),
    );
  },
)