flutter - 收到此错误 : Unhandled Exception: FormatException: Invalid envelope - While adding the contact

Question

使用联系服务添加联系人时出现错误。

Contact newContact = new Contact();

newContact.givenName ="Ajay";
newContact.familyName ="abc";

newContact.phones = [Item(label: "mobile",value: "9998887771")];

await ContactsService.addContact(newContact);

Answer 1

这将解决您的问题:
处理权限的最新版本是现在permission_handler: ^5.0.1+1

    Future<void> saveContactInPhone() async {
    try {

      print("saving Contact");
      PermissionStatus permission = await Permission.contacts.status;

    if (permission != PermissionStatus.granted) {
      await Permission.contacts.request();
      PermissionStatus permission = await Permission.contacts.status;

      if (permission == PermissionStatus.granted) {
      Contact newContact = new Contact();

        newContact.givenName ="Ajay";
        newContact.familyName ="abc";

          newContact.phones = [Item(label: "mobile",value: "9998887771")];

        await ContactsService.addContact(newContact);

      } else {
        //_handleInvalidPermissions(context);
      }
    } else {
      Contact newContact = new Contact();

        newContact.givenName ="Ajay";
        newContact.familyName ="abc";

          newContact.phones = [Item(label: "mobile",value: "9998887771")];

        await ContactsService.addContact(newContact);
    }
      print("object");      

    } catch (e) {
      print(e);
    }
  }

这对我来说非常好。