Dart文件调用错误：获取设备信息时报无法调用非函数表达式

在编写device_info.dart获取设备信息时，因原device_info包不兼容Dart 3+，改用device_info_plus后，代码中return deviceInfoPlugin(name, identifier, version)两行触发该错误。原代码如下：

import 'package:device_info/device_info.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/services.dart';

import '../domain/model/model.dart';

Future<DeviceInfo> getDeviceDetails() async {
  String name = "unknown";
  String identifier = "unknown";
  String version = "unknown";
  DeviceInfoPlugin deviceInfoPlugin = DeviceInfoPlugin();

  try {
    if (defaultTargetPlatform == TargetPlatform.android) {
      //Android
      AndroidDeviceInfo androidDeviceInfo = await deviceInfoPlugin.androidInfo;
          name = "${androidDeviceInfo.brand} ${androidDeviceInfo.model}";
      identifier = androidDeviceInfo.id;
      version = androidDeviceInfo.version.codename;
    }
    if (defaultTargetPlatform == TargetPlatform.iOS) {
      // iOS
      IosDeviceInfo iosDeviceInfo = await deviceInfoPlugin.iosInfo;
      name = "${iosDeviceInfo.systemName} ${iosDeviceInfo.model}";
      identifier = iosDeviceInfo.identifierForVendor;
      version = iosDeviceInfo.systemVersion;
    }
  } on PlatformException {
// return default data error

    return deviceInfoPlugin(name, identifier, version);
  }
  return deviceInfoPlugin(name, identifier, version);
}

错误原因 #

1. 对象与构造函数混淆：deviceInfoPlugin是你创建的DeviceInfoPlugin类的实例对象，不是你定义的DeviceInfo模型类的构造方法，直接用它传参调用会触发函数调用错误。
2. 导入包错误：代码里导入的还是旧的device_info包，而非device_info_plus。
3. API调用方式错误：device_info_plus中获取安卓/iOS设备信息的方法是androidInfo()和iosInfo()（需要加括号调用），而非原代码中的属性访问。

修复步骤 #

1. 替换导入包：将旧的包导入替换为device_info_plus：

   import 'package:device_info_plus/device_info_plus.dart';
   

2. 修正API调用：把属性访问改为方法调用：
   • await deviceInfoPlugin.androidInfo → await deviceInfoPlugin.androidInfo()
   • await deviceInfoPlugin.iosInfo → await deviceInfoPlugin.iosInfo()
3. 正确返回模型对象：将return deviceInfoPlugin(name, identifier, version)替换为DeviceInfo模型类的构造调用（根据你的Model.dart中定义的构造方法调整参数形式，示例为命名参数）：

   return DeviceInfo(name: name, identifier: identifier, version: version);
   

修复后的完整代码 #

import 'package:device_info_plus/device_info_plus.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/services.dart';

import '../domain/model/model.dart';

Future<DeviceInfo> getDeviceDetails() async {
  String name = "unknown";
  String identifier = "unknown";
  String version = "unknown";
  final deviceInfoPlugin = DeviceInfoPlugin();

  try {
    if (defaultTargetPlatform == TargetPlatform.android) {
      final androidDeviceInfo = await deviceInfoPlugin.androidInfo();
      name = "${androidDeviceInfo.brand} ${androidDeviceInfo.model}";
      identifier = androidDeviceInfo.id;
      version = androidDeviceInfo.version.codename;
    } else if (defaultTargetPlatform == TargetPlatform.iOS) {
      final iosDeviceInfo = await deviceInfoPlugin.iosInfo();
      name = "${iosDeviceInfo.systemName} ${iosDeviceInfo.model}";
      identifier = iosDeviceInfo.identifierForVendor ?? "unknown";
      version = iosDeviceInfo.systemVersion;
    }
  } on PlatformException {
    // 异常时返回默认设备信息
    return DeviceInfo(name: name, identifier: identifier, version: version);
  }
  return DeviceInfo(name: name, identifier: identifier, version: version);
}

内容的提问来源于stack exchange，提问作者Akash Soam