我有一个颤振应用程序。我通过 HTTP 在那里拍摄图像并希望缓存它们，因为滚动时所有内容都会再次加载并需要时间。\n我该如何解决这个问题？如果你能给出一个例子，请。\n有必要不再下载它。那些已加载的产品最好已经在缓存中或者至少是图片中。我怎样才能做到这一点？
\n//method gets products\nFuture<List<Product>> getProducts(int id) async {\nvar response = await http.get(Uri.parse('...'));\nfinal products = jsonDecode(response.body).cast<Map<String, dynamic>>();\n\nList<Product> list = products.map<Product>((json) => Product.fromJson(json)).toList();\n\nreturn list;}\n// parse json\nfactory Product.fromJson(Map<String, dynamic> data) {\nreturn Product(\n id: data['id'] as int,\n title: data['name'] as String,\n description: data['description'] as String,\n imgUrl: data['images'][0]['src'] as String,\n price: num.tryParse(data['price'])\n);}\n//draw products\nWidget build(BuildContext context) {\nfinal product = Provider.of<Product>(context, listen: false);\n\nreturn Container(\n width: 150,\n padding: const EdgeInsets.all(10.0),\n margin: const EdgeInsets.all(5.0),\n decoration: BoxDecoration(\n borderRadius: BorderRadius.circular(15.0),\n color: Color(422),\n ),\n child: Column(\n mainAxisAlignment: MainAxisAlignment.spaceBetween,\n crossAxisAlignment: …