无法在flutter应用程序中使用contacts_service添加联系人

Question

 void saveContactInPhone() {
try {

  print("saving Conatct");
  Contact contact = Contact();
    print("fi");
    contact.displayName = myController1.text ; 
    contact.phones = [Item(label: "mobile", value: myController4.text)];
    // contact.emails = [Item(label: "email", value: myController3.text)];
    contact.company = myController2.text;
    print("fi2");

  ContactsService.addContact(contact);
  print("object");      

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

错误：

I/flutter ( 1615): form init

I/flutter(1615)://data/user/0/com.example.camera_app/app_flutter/2020-05-29 23:35:12.398628.PNG I/flutter（1615）：Going Image I/flutter（1615）：404 I/flutter（1615）：Image Send I/flutter（1615）：form come listenForSinglecontact I/flutter（1615）：saving I/flutter（1615）：fi I/flutter（1615）：fi I/flutter（1615）：fi I/flutter（1615）：fi I/flutter（1615）：Flutter(1615):#0 StandardMethodCodec.DecodeEnvelope（包:Flutter/SRC/Services/Message_Codecs.Dart:571:7)E/Flutter(1615):#1 MethodChannel._InvokeMethod（包:Flutter/SRC/Services/Platform_Channel.Dart:156:18)E/Flutter(1615):E/Flutter(1615):#2 MethodChannel.InvokeMethod（包:Flutter/SRC/Services/Platform_Channel.Dart:329:12)E/Flutter(1615):#3 E/Flutter(1615):#4_formstate.savedata（包:camera_app/screens/form.dart:249:23)E/Flutter(1615):#5_INKResponseState._Handletap（包:flutter/src/Material/INK_Well.dart:779:19)E/flutter(1615):#6_INKResponseState.build。（包:flutter/src/material/ink_well.dart:862:36)e/flutter(1615):#7 gesturerecognizer.invokecallback（包:flutter/src/gestures/recogizer.dart:182:24)e/flutter(1615):#8 tapgesterecognizer.handletapup（包:flutter/src/gestures/tap.dart:504:11)e/flutter(1615):#9 basetapgesterecognizer.HandlePrimaryPointer(package:flutter/src/gestures/tap.dart:217:7)E/Flutter(1615):#11 primarypointergesturerecognizer.handleEvent（package:flutter/src/gestures/recognizer.dart:475:9)E/Flutter(1615):#12 pointerrouter._dispatcheventtoroutes（package:flutter/src/gestures/pointerrouter.（包:flutter/src/gestures/pointer_router.dart:122:9)E/flutter(1615):#14_LinkedHashmapmixin.foreach（包:collection-patch/compact_hash.dart:379:8)E/flutter(1615):#15 pointerrouter._dispatcheventtoroutes（包:flutter/src/gestures/pointer_router.dart:120:18)E/flutter(1615):#16 pointerrouter.route（包ures/binding.dart:218:19)e/flutter(1615):#18手势绑定。dispatchevent（包：flutter/src/手势/绑定。dart:198:22)e/flutter(1615):#19手势绑定。_handlepointerevent（包：flutter/src/手势/绑定。dart:156:7)e/flutter(1615):#20手势绑定。_flushpointereventqueue（包：flutter/src/手势/绑定。dart:102:7)e/flutter(1615):#21手势绑定。

Answer 1

实际上我遗漏了权限部分。哦，我在Flutter是个新手。

这为我工作，最后为保存在主要联系人或电话目录中的联系人。

因此，让我们对它使用contacts_service0.4.6。首先，将依赖项添加为：

dependencies:  
contacts_service: ^0.4.6

<uses-permission android:name="android.permission.READ_CONTACTS" />  
<uses-permission android:name="android.permission.WRITE_CONTACTS" />  

<key>NSContactsUsageDescription</key>  
<string>This app requires contacts access to function properly.</string>  

import 'package:contacts_service/contacts_service.dart'; 

基本上，

 final myController1 = TextEditingController();
 final myController2 = TextEditingController();
 ...

这些变量用于存储用户在Textfield或TextForm中输入的值。可以使用MyController1.text查询该值。我们还可以将Contact类对象存储为：

   newContact.givenName = "Some name";
            newContact.emails = [
              Item(label: "email", value: "[e-mail]")
            ];
            newContact.company = myController2.text;
            newContact.phones = [
              Item(label: "mobile", value: "123456789")
            ];

仅保存联系人的代码：

     Future<void> saveContactInPhone() async {
    try {

      print("saving Conatct");
      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 = myController1.text;
        newContact.emails = [
          Item(label: "email", value: myController3.text)
        ];
        newContact.company = myController2.text;
        newContact.phones = [
          Item(label: "mobile", value: myController4.text)
        ];
        newContact.postalAddresses = [
          PostalAddress(region: myController6.text)
        ];
        await ContactsService.addContact(newContact);

      } else {
        //_handleInvalidPermissions(context);
      }
    } else {
      Contact newContact = new Contact();
        newContact.givenName = myController1.text;
        newContact.emails = [
          Item(label: "email", value: myController3.text)
        ];
        newContact.company = myController2.text;
        newContact.phones = [
          Item(label: "mobile", value: myController4.text)
        ];
        newContact.postalAddresses = [
          PostalAddress(region: myController6.text)
        ];
        await ContactsService.addContact(newContact);
    }
      print("object");      

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

Future<void> saveContactInPhone() async {
    try {
      print("saving Conatct");
      PermissionStatus permission = await Permission.contacts.status;

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

        if (permission == PermissionStatus.granted) {
          if (widget.checkPrev == 'for_edit') {
            // Contact updatedContact = new Contact();
            Iterable<Contact> updatedContact =
                await ContactsService.getContacts(query: myController1.text);

            Contact updatedContact1 = new Contact();
            updatedContact1 = updatedContact.first;
            await ContactsService.deleteContact(updatedContact1);
            Contact newContact = new Contact();
            newContact.givenName = myController1.text;
            newContact.emails = [
              Item(label: "email", value: myController3.text)
            ];
            newContact.company = myController2.text;
            newContact.phones = [
              Item(label: "mobile", value: myController4.text)
            ];
            newContact.postalAddresses = [
              PostalAddress(region: myController6.text)
            ];
            await ContactsService.addContact(newContact);
          } else if (widget.checkPrev == 'from_btn') {
            Contact newContact = new Contact();
            newContact.givenName = myController1.text;
            newContact.emails = [
              Item(label: "email", value: myController3.text)
            ];
            newContact.company = myController2.text;
            newContact.phones = [
              Item(label: "mobile", value: myController4.text)
            ];
            newContact.postalAddresses = [
              PostalAddress(region: myController6.text)
            ];
            await ContactsService.addContact(newContact);
          }
        }
      } else {
        if (widget.checkPrev == 'for_edit') {
          // Contact updatedContact = new Contact();
          Iterable<Contact> updatedContact =
              await ContactsService.getContacts(query: myController1.text);

          await ContactsService.deleteContact(updatedContact.first);
          // Contact updatedContact1 = new Contact();
          // updatedContact1= updatedContact.first;
          Contact newContact = new Contact();
          newContact.givenName = myController1.text;
          newContact.emails = [Item(label: "email", value: myController3.text)];
          newContact.company = myController2.text;
          newContact.phones = [
            Item(label: "mobile", value: myController4.text)
          ];
          newContact.postalAddresses = [
            PostalAddress(region: myController6.text)
          ];
          await ContactsService.addContact(newContact);
        } else if (widget.checkPrev == 'from_btn') {
          Contact newContact = new Contact();
          newContact.givenName = myController1.text;
          newContact.emails = [Item(label: "email", value: myController3.text)];
          newContact.company = myController2.text;
          newContact.phones = [
            Item(label: "mobile", value: myController4.text)
          ];
          newContact.postalAddresses = [
            PostalAddress(region: myController6.text)
          ];
          await ContactsService.addContact(newContact);
        }
      }
    } catch (e) {
      print(e);
    }
  }