I am new to ionic. I want to open pdf file which is in server.
For that the following plugins. But still pdf is not opening.
First I have installed and added these plugins.
 1. ionic cordova plugin add cordova-plugin-file  
    npm install @ionic-native/file
 2. ionic cordova plugin add cordova-plugin-file-opener2  
    npm install @ionic-native/file-opener
 3. ionic cordova plugin add cordova-plugin-file-transfer  
    npm install @ionic-native/file-transfer
 4. ionic cordova plugin add cordova-plugin-document-viewer  
    npm install @ionic-native/document-viewer
In my app.module.ts
import { DocumentViewer } from '@ionic-native/document-viewer/ngx';  
import { File } from '@ionic-native/file/ngx';  
import { FileOpener } from '@ionic-native/file-opener/ngx';  
import { FileTransfer } from '@ionic-native/file-transfer/ngx';  
  
@NgModule({  
   declarations: [AppComponent],  
   entryComponents: [],  
   providers: [  
    DocumentViewer,
    File,
    FileOpener,
    FileTransfer,  
   ],  
   bootstrap: [AppComponent]  
})  
In my home.page.ts
constructor(document: DocumentViewer, public file: File, public ft: FileTransfer, public fileOpener: FileOpener) { }
viewBook() {
   let path = this.file.dataDirectory;  
   const transfer = this.ft.create();  
   transfer.download("https://www.w3.org/WAI/ER/tests/xhtml/testfiles/resources/pdf/dummy.pdf", path + 'myfile.pdf').then(entry => {  
   let url = entry.toURL();  
   this.document.viewDocument(url, 'application/pdf', {});
}  
This is not works.
I also tried this.
In home.page.ts
this.fileOpener.open(url, 'application/pdf');  
But this also not works.
Please tell me what's wrong here.
Thanks.