我试图通过使用FileOpener插件按下Ionic Capacitor上的按钮来打开PDF，但它不起作用，有人知道如何帮助我吗？
PDF存储到资产/文档中
在控制台中，我得到这个错误“.open，但Cordova不可用。确保包含cordova.js或在设备/模拟器cordovaWarn @ common.js：284 ch”中运行。
这是我的app. modul.ts

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { RouteReuseStrategy } from '@angular/router';
import { IonicModule, IonicRouteStrategy } from '@ionic/angular';
import { AppComponent } from './app.component';
import { AppRoutingModule } from './app-routing.module';

import { File } from '@ionic-native/file/ngx';
import { FileOpener } from '@ionic-native/file-opener/ngx';

@NgModule({
  declarations: [AppComponent],
  imports: [BrowserModule, IonicModule.forRoot(), AppRoutingModule],
  providers: [
    { provide: RouteReuseStrategy, useClass: IonicRouteStrategy },
    File,
    FileOpener
  ],
  bootstrap: [AppComponent],
})
export class AppModule {}

这是我的页面后端：open-pdf.page.ts:

import { Component, OnInit } from '@angular/core';
import { FileOpener } from '@ionic-native/file-opener/ngx';
import { File, IWriteOptions } from '@ionic-native/file/ngx';

@Component({
  selector: 'app-open-pdf',
  templateUrl: './open-pdf.page.html',
  styleUrls: ['./open-pdf.page.scss'],
})
export class OpenPdfPage implements OnInit {

  constructor(private fileOpener: FileOpener) { }

  ngOnInit() {
  }

  openPdf(){
    this.fileOpener.open('/assets/documents/mizzica.pdf', 'application/pdf')
    .then(() => console.log('File is exported'))
    .catch((e) => console.log(e));
  }

}

这是HTML：

<ion-header [translucent]="true">
  <ion-toolbar>
    <ion-title>openPdf</ion-title>
  </ion-toolbar>
</ion-header>

<ion-content [fullscreen]="true">
  <ion-header collapse="condense">
    <ion-toolbar>
      <ion-title size="large">openPdf</ion-title>
    </ion-toolbar>
  </ion-header>
  <ion-button (click)="openPdf()">Apri PDF</ion-button>
</ion-content>

谢谢你
我想在屏幕上显示一个pdf