是否将var从另一个文件导入到main.dart？ [英] Importing var to main.dart from another file?

问题描述

在checkContact.dart

Future<void> checkContactPermission() async {
  var status = await Permission.contacts.status;
  if (!status.isGranted) {
    PermissionStatus permissionStatus = await Permission.contacts.request();
    status = await Permission.contacts.status;
    if (status.isDenied) {
      PermissionStatus permissionStatus = await Permission.contacts.request();
    }
  }
  if (status.isGranted) {
    var contacts = await ContactsService.getContacts(withThumbnails: false);
    var list = contacts;
    list.shuffle();
    var FamilyMember = (list.first.phones?.first.value);
    await FlutterPhoneDirectCaller.callNumber('$FamilyMember');
  }
}

在main.dart

AwesomeDialog(
    context: context,
    dialogType: DialogType.SUCCES,
    borderSide:
    const BorderSide(color: Colors.green, width: 3),
    width: double.infinity,
    buttonsBorderRadius:
    const BorderRadius.all(Radius.circular(2)),
    animType: AnimType.TOPSLIDE,
    title: 'Family member call receiver',
    desc: '$FamilyMember',   <------ here is the problem

我希望将$FamilyMember中的$FamilyMember显示在main.dart上。上面的代码给我一个错误，说FamilyMember未定义。print('$FamilyMember')在checkContact.dart上运行良好，但为什么在main.dart上出现问题？

推荐答案

首先需要在checkContactPermission函数外部定义familyMember变量。 如果checkContact.dart位于不同的文件中，则将它们导入到main.dart文件中。

这将是结束代码。

在checkContact.dart

var familyMember = '';

Future<void> checkContactPermission() async {
  var status = await Permission.contacts.status;
  if (!status.isGranted) {
    PermissionStatus permissionStatus = await Permission.contacts.request();
    status = await Permission.contacts.status;
    if (status.isDenied) {
      PermissionStatus permissionStatus = await Permission.contacts.request();
    }
  }
  if (status.isGranted) {
    var contacts = await ContactsService.getContacts(withThumbnails: false);
    var list = contacts;
    list.shuffle();
    familyMember = (list.first.phones?.first.value ?? '');
    await FlutterPhoneDirectCaller.callNumber('$familyMember');
  }
}

在main.dart

import 'checkContact.dart';

AwesomeDialog(
    context: context,
    dialogType: DialogType.SUCCES,
    borderSide:
    const BorderSide(color: Colors.green, width: 3),
    width: double.infinity,
    buttonsBorderRadius:
    const BorderRadius.all(Radius.circular(2)),
    animType: AnimType.TOPSLIDE,
    title: 'Family member call receiver',
    desc: '$familyMember',   <------ the problem will go away

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