android - snapshot.hasData return an empty array

Question

I'm trying to get the data to display in List view but unfortunately i'm facing the error as the snapshot return empty values

Below is the code for my API

 static Future<List<Permission>> getPermissionData() async {
    String ruhusa = 'permission';
    var response = await http.get(mainUrl + ruhusa,
          headers: setHeader(accessKey.accessKey));

      List<Permission> permissions = [];
      if(response.statusCode == 200){

        print(response.statusCode);

        Map<String, dynamic> body = jsonDecode(response.body);
        // print(response.body);
        for(var item in body['msg']){
          Permission permission = Permission.fromJson(item);
          permissions.add(permission);
          // return permissions; 
        }
        return permissions;
      }  
      // print(permissions); 
      return permissions; 

  }

This is the code where i want to display using future builder

 body: FutureBuilder(
        future: PermissionService.getPermissionData(),
        builder: (BuildContext context, AsyncSnapshot<List<Permission>> snapshot) {
          if (snapshot.connectionState == ConnectionState.done) {
            if (snapshot != null) {
              print("This is ${snapshot.data}");
              return ListView.builder(
                itemCount: snapshot.data?.length ?? 0,
                itemBuilder: (context, index) {
                  return GestureDetector(
                    onTap: () {
                      Navigator.pushNamed(context, permissionSpecificRoute,
                          arguments: snapshot.data[index]);
                    },
                    child: PermissionCard(
                      permission: snapshot.data[index],
                    ),
                  );
                },
              );
            } else if(snapshot.hasError) {
               return Center(child: Text("Oops error issues is ${snapshot.hasError}"));
            }
            else {
              return Center(child: Text('No permissions requested'));
            }
          } else {
            return PageLoader();
          }
        },
      ),

When I try to print it in my console it return

This is []

Anyone who can help please what should i do to make the snapshot receive the real data

Answer 1

等待大神答复