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cordova – InAppBrowser有时会为空/空白

我正在开发一个项目,我在其中大量使用InAppBrowser来查看不同的文档(PDF,DOC,DOCX).我使用help doc docs.google.com执行此操作,文档存储在firebase-storage中.
大部分时间它在我的 Android设备上运行良好!但有时我得到的只是一个空的白色屏幕,我必须按后退按钮关闭InAppBrowser,然后重新打开它以显示文档.

在Chrome开发人员工具中远程调试这种奇怪的行为时,我看到loadstart和loadstop事件被正确调用:

Chrome developer tools,when remotely debugging the app,while opening InAppBrowser

当我在空白/白色InAppBrowser中查看HTML时,我看到空< body> -tags:

Chrome developer tools,looking at the HTML for the empty white InAppBrowser

用于打开InAppBrowser的代码:

import { Injectable } from '@angular/core';
import { Platform } from 'ionic-angular';
import { InAppBrowser,InAppBrowserObject } from '@ionic-native/in-app-browser';
import { ScreenOrientation } from '@ionic-native/screen-orientation';
import { LoaderService } from './loader-service';
import * as firebase from 'firebase';

@Injectable()
export class FirebaseStorageService{
    browserOptions: string;
    browser: InAppBrowserObject;

    constructor(
        private iab: InAppBrowser,private loaderService:LoaderService,private platform: Platform,private screenOrientation: ScreenOrientation
    ){
        this.browserOptions = 'zoom=no,location=no,useWideViewPort=no,hidden=yes,enableViewportScale=yes';
    }

    viewPdf(path: string,loadText?:string):Promise<any>{
        this.showLoader(loadText);
        return new Promise<any>((resolve,reject) => {
            firebase.storage().ref().child(path).getDownloadURL().then(url => {
                let newURL = 'https://docs.google.com/gview?&url=' + encodeURIComponent(url);
                this.startBrowser(newURL);
                resolve();
            })
            .catch(err => {
                if(this.platform.is('cordova')){
                    this.loaderService.dismissLoader();
                }
                reject(err);
            });
        })
    }

    private startBrowser(path:string):void{
        this.browser = this.iab.create(path,'_blank',this.browserOptions);
        if(this.platform.is('cordova')){
            this.handleBrowserSubscriptions();
            this.screenOrientation.unlock();
        }
    }

    private handleBrowserSubscriptions():void{
        let stopSub = this.browser.on('loadstop').subscribe(event => {
            console.log('loadstop',event)
            this.loaderService.dismissLoader();
            this.browser.show();
            stopSub.unsubscribe();
            errorSub.unsubscribe();
        });

        let exitSub = this.browser.on('exit').subscribe(event => {
            console.log('exit:',event)
            this.loaderService.dismissLoader();
            exitSub.unsubscribe();
            this.browser.close();
            this.screenOrientation.lock(this.screenOrientation.ORIENTATIONS.PORTRAIT);
        });

        let errorSub = this.browser.on('loaderror').subscribe(event => {
            console.log('loaderror',event)
            this.loaderService.dismissLoader();
            this.browser.close();
            this.screenOrientation.lock(this.screenOrientation.ORIENTATIONS.PORTRAIT);
            stopSub.unsubscribe();
            errorSub.unsubscribe();
        });

        let startSub = this.browser.on('loadstart').subscribe(event => {
            console.log('loadstart',event);
        })
    }
}

离子信息:

Cordova CLI:7.0.1
离子框架版本:3.2.0
离子CLI版本:2.2.1
Ionic App Lib版本:2.2.0
Ionic App Scripts版本:1.3.7
ios-deploy版本:未安装
ios-sim版:未安装
操作系统:Windows 10
节点版本:v6.9.4
Xcode版本:未安装

有没有其他人经历过这个,或者有谁知道如何解决这个问题?

解决方法

您正在使用其中一种方式在Android的Web视图中打开文档

方案1:
您当前的网页视图,您可以修改如下:

encodeURI('https://docs.google.com/gview?embedded=true&url=http://www.your-server.com/files/your_file.pdf')

编码完整网址,包括https://docs.google.com

这是加载网址的另一种方法:

http://docs.google.com/viewer?url=http://example.com/example.pdf

如果任何此解决方案无效,请尝试下载该文件并在浏览器中打开它.

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