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

Posted 2023-01-15

实际上，我正在构建一个读卡器应用程序，其中的数据来自ML模型，并存储在mycontrollers函数中。但是在使用ContactsService.addContact（contact）;时我出错了。尽管联系人已保存在应用程序中，但未保存在手机的联系人列表中。

代码：

 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.pngI / flutter（1615）：影像I /颤振（1615）：404I / flutter（1615）：图像发送I / flutter（1615）：表单来监听I /颤振（1615）：保存I /颤振（1615）：fiI /颤振（1615）：fi2I /颤振（1615）：对象E / flutter（1615）：[错误：flutter / lib / ui / ui_dart_state.cc（157）]未处理的异常：FormatException：无效的信封E / flutter（1615）：＃0 StandardMethodCodec.decodeEnvelope（package：flutter / src / services / message_codecs.dart：571：7）E / flutter（1615）：＃1 MethodChannel._invokeMethod（软件包：flutter / src / services / platform_channel.dart：156：18）E /颤振（1615）：E / flutter（1615）：＃2 MethodChannel.invokeMethod（package：flutter / src / services / platform_channel.dart：329：12）E / flutter（1615）：＃3 ContactsService.addContact（package：contacts_service / contacts_service.dart：83：16）E / flutter（1615）：＃4 _FormState.saveData（package：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。 （包装：flutter / src / material / ink_well.dart：862：36）E / flutter（1615）：＃7 GestureRecognizer.invokeCallback（package：flutter / src / gestures / recognizer.dart：182：24）E / flutter（1615）：＃8 TapGestureRecognizer.handleTapUp（包：flutter / src / gestures / tap.dart：504：11）E / flutter（1615）：＃9 BaseTapGestureRecognizer._checkUp（包：flutter / src / gestures / tap.dart：282：5）E / flutter（1615）：＃10 BaseTapGestureRecognizer.handlePrimaryPointer（包：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._dispatch（软件包：flutter / src / gestures / pointer_router.dart：76：12）E / flutter（1615）：＃13 PointerRouter._dispatchEventToRoutes。 （包：flutter / src / gestures / pointer_router.dart：122：9）E / flutter（1615）：＃14 _LinkedHashMapMixin.forEach（dart：collection-patch / compact_hash.dart：379：8）E / flutter（1615）：＃15 PointerRouter._dispatchEventToRoutes（package：flutter / src / gestures / pointer_router.dart：120：18）E / flutter（1615）：＃16 PointerRouter.route（package：flutter / src / gestures / pointer_router.dart：106：7）E / flutter（1615）：＃17 GestureBinding.handleEvent（package：flutter / src / gestures / binding.dart：218：19）E / flutter（1615）：＃18 GestureBinding.dispatchEvent（package：flutter / src / gestures / binding.dart：198：22）E / flutter（1615）：＃19 GestureBinding._handlePointerEvent（package：flutter / src / gestures / binding.dart：156：7）E / flutter（1615）：＃20 GestureBinding._flushPointerEventQueue（package：flutter / src / gestures / binding.dart：102：7）E / flutter（1615）：＃21 GestureBinding._handlePointerDataPacket（package：flutter / src / gestures / binding.dart：86：7）

答案

实际上，我缺少权限部分。哦，我真是Flutter的新手。

这最后对我有用，因为它可以将联系人保存在MAin联系人或电话目录中。

因此，我们使用contacts_service 0.4.6。首先，将依赖项添加为：

dependencies:  
contacts_service: ^0.4.6

权限：

对于android将以下权限添加到您的AndroidManifest.xml：

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

对于ios在您的Info.plist文件中设置NSContactsUsageDescription

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

导入库：

import 'package:contacts_service/contacts_service.dart'; 

基本上，

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

这些是用于存储用户在Textfield或Textform中输入的值的变量。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")
            ];

仅用于保存联系人的代码：

     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);
    
  

突然间，我发现很难在实际电话目录中反映所做的更改。所以我想出了这个解决方案：

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);
    
  

这将保存联系人并在当前应用程序中进行更改时编辑联系人。