Ionic本机插件在浏览器，虚拟设备（Nox）和Android设备（Vivo V15 Pro）中始终返回null

Question

我正在为浏览器和android构建混合应用程序，并且我使用Angular 7构建了我的整个项目。然后，我计划使用设备插件（Ionic Plugin {@ ionic-native-device}和{cordova-plugin-device}），我做对了所有事情，并与所有教程匹配，但是无论如何，该程序在每个平台上都始终返回null （例如浏览器，Android虚拟机和Android设备）

我已经从这里Ionic Plugin Device安装了所需的插件，并导入到组件和模块中

==========================组件================== =========

import { Component, OnInit, ViewChild } from '@angular/core';
import { NgForm } from '@angular/forms';
import { Router, ActivatedRoute } from "@angular/router";
import { GlobalVarService }  from './../services/global-var.service';
import { Device } from '@ionic-native/device/ngx'; <-- import

@Component({
  selector: 'app-login',
  templateUrl: './login.component.html',
  styleUrls: ['./login.component.scss']
})
export class LoginComponent {
  @ViewChild('f') loginForm: NgForm;
  username : string;
  password : string;
  model:any = {
    username:'',
    password:''
  }
  constructor(private router: Router,
        private gVar: GlobalVarService,
        private route: ActivatedRoute,
        private device: Device) {

    console.log(this.device.uuid);
    alert(this.device.uuid); <-- This is the way i call
  }


    onSubmit() {
      this.gVar.processLogin(this.model.username, this.model.password, 'true');

    }

    onForgotPassword() {
        this.router.navigate(['forgotpassword'], { relativeTo: this.route.parent });
    }

    onRegister() {
        this.router.navigate(['register'], { relativeTo: this.route.parent });
    }

}

===========================模块================== =========

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';

import { FormsModule } from '@angular/forms';
import { Routes, RouterModule } from '@angular/router';

import { Device } from '@ionic-native/device/ngx'; <--- also import

import { LoginComponent } from './login.component';


const routes: Routes = [
  {
    path: '',
    component: LoginComponent
  }
];

@NgModule({
  imports: [
    CommonModule,
    FormsModule,
    RouterModule.forChild(routes)
  ],
  providers: [
      Device <--- This is how i place
  ],
  declarations: [LoginComponent]
})

export class LoginModule { }