Question

我正在开展一个项目，在那里我充分利用InAppBrowser来查看不同的文档（PDF，DOC，DOCX）。我使用帮助och docs.google.com执行此操作，文档存储在firebase-storage中。大多数时候它在我的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开发者工具中远程调试此奇怪行为时，我发现loadstart和loadstop事件被正确调用：

当我查看空白/ HTML中的InAppBrowser时，我看到空<body> - 标签：

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 Ionic Framework Version: 3.2.0 Ionic CLI Version: 2.2.1 Ionic App Lib Version: 2.2.0 Ionic App Scripts Version: 1.3.7 ios-deploy version: Not installed ios-sim version: Not installed OS: Windows 10 Node Version: v6.9.4 Xcode version: Not installed

有没有其他人经历过这个，或者有人知道如何解决这个问题吗？

Answer 1

您正在使用其中一种方式在Android的网络视图中打开文档

<强>解决方案-1：您当前的网页视图可以修改如下：

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

编码包含https://docs.google.com

的完整网址

这是另一种加载网址的方法：

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

如果这些解决方案中的任何一个没有解决，请尝试下载该文件并在浏览器中打开它。

InAppBrowser有时为空/空白

1 个答案: