出现此错误 - 类型 'Future<dynamic>' 不是类型 'List<dynamic>' 的子类型

Question

每当尝试调用未来数据并尝试转换为List 时，它都会返回错误

类型“未来”不是类型“列表”的子类型

尝试过类型转换，但没有帮助

在 HomePage.dart

final getPost = NetworkFile().getPosts();
  List posts;

  void getPostsList() {
    setState(() {
      var res = getPost;
      posts = res as List<dynamic>;
      print(posts);
    });
  } 

在 Network.dart

class NetworkFile{

Future<dynamic> getPosts() async {
    var response = await http.get('$kBlogURL' + 'posts?_embed');
    Iterable resBody = await jsonDecode(response.body.toString());
    return resBody;
  }
} 

Answer 1

您正在解码响应及其类型为dynamic 的List。处理它的方法很少。您可以创建一个简单的 PODO 类并转换/映射到它。或者像下面这样：

List posts = [];

void getPostsList() async {
  final fetchedPosts = await NetworkFile().getPosts();
  setState(() {
    posts = fetchedPosts;
  });
  print(posts);
}

Here is a nice article about PODO.

Answer 2

final getPost = NetworkFile().getPosts();
Map posts;

void getPostsList() async {
  var res = await getPost;
  setState(() {
    posts = res as Map<String, dynamic>;
    print(posts);
  });
}


class NetworkFile {
  Future<dynamic> getPosts() async {
    var response = await http.get('https://onetechstop.net/wp-json/wp/v2');
    var resBody = await jsonDecode(response.body.toString());
    return resBody;
  }
}