flutter_inappwebview 和 flutter_downloader - 不确定我做错了什么？

编程问答 2022-05-31

问题描述

前期信息：

Language: Flutter/Dart
Flutter Packages: Flutter_inappwebview,Flutter_downloader

我使用 Flutter 为 Android 构建的移动应用程序出现问题。该应用程序的一项功能是能够下载与 PDF 文件关联的链接。这些文件位于应用程序已经访问的服务器上。用户已通过应用程序登录，因此已建立身份验证。当单击包含 PDF 的 URL 时，它会执行重定向，并返回并下载主页（index.PHP）。我不知道这是怎么发生的，但我有想法。

  1. 我需要在当前的 webview 中进行下载（就像在同一个会话和窗口中一样）。
  2. 禁用 URL 重定向。
  3. 找出链接被重定向以进行身份​​验证的原因（假设它重定向到主页）。

任何想法或帮助将不胜感激。也很乐意提供更多信息。

在 main.dart 中：

onDownloadStart: (controller,url) async {
                print("onDownloadStart $url");
                final taskId = await FlutterDownloader.enqueue(
                  headers: {'My-Custom-Header': 'custom_value=564hgf34'},url: url,savedDir: (await getExternalStorageDirectory()).path,showNotification: true,// show download progress in status bar (for Android)
                  openFileFromNotification: true,// click on notification to open downloaded file (for Android)
                );
                return taskId;
              },

日志：

I/Flutter (28552): onDownloadStart https://hjhvtc.online/pluginfile.PHP/6723/mod_resource/content/1/Automotive%20industry%20jobs.pdf
W/WM-WorkSpec(28552): Backoff delay duration less than minimum value
D/DownloadWorker(28552): DownloadWorker{url=https://hjhvtc.online/pluginfile.PHP/6723/mod_resource/content/1/Automotive%20industry%20jobs.pdf,filename=null,savedDir=/storage/emulated/0/Android/data/com.coffeepaulconsulting.hjhvtconline/files,header={"My-Custom-Header": "custom_value=564hgf34"},isResume=false
D/DownloadWorker(28552): Update notification: {notificationId: 1,title: https://hjhvtc.online/pluginfile.PHP/6723/mod_resource/content/1/Automotive%20industry%20jobs.pdf,status: 2,progress: 0}
D/DownloadWorker(28552): Open connection to https://hjhvtc.online/pluginfile.PHP/6723/mod_resource/content/1/Automotive%20industry%20jobs.pdf
D/DownloadWorker(28552): Headers = {"My-Custom-Header": "custom_value=564hgf34"}
D/DownloadWorker(28552): Response with redirection code
D/DownloadWorker(28552): Location = https://hjhvtc.online/login/index.PHP
D/DownloadWorker(28552): New url: https://hjhvtc.online/login/index.PHP
D/DownloadWorker(28552): Open connection to https://hjhvtc.online/login/index.PHP
D/DownloadWorker(28552): Headers = {"My-Custom-Header": "custom_value=564hgf34"}
V/InputMethodManager(28552): b/117267690: Failed to get fallback IMM with expected displayId=197 actual IMM#displayId=0 view=com.pichillilorenzo.Flutter_inappwebview.InAppWebView.InAppWebView{4592e22 VFEDHVCL. ......ID 0,0-1080,1997}
D/DownloadWorker(28552): Content-Type = text/html; charset=utf-8
D/DownloadWorker(28552): Content-Length = -1
D/DownloadWorker(28552): Charset = UTF-8
D/DownloadWorker(28552): Content-disposition = null
D/DownloadWorker(28552): fileName = index.PHP
D/DownloadWorker(28552): Update too frequently!!!!,this should be dropped
D/DownloadWorker(28552): There's no application that can open the file /storage/emulated/0/Android/data/com.coffeepaulconsulting.hjhvtconline/files/index.PHP
D/DownloadWorker(28552): Update too frequently!!!!,but it is the final update,we should sleep a second to ensure the update call can be processed
D/DownloadWorker(28552): Update notification: {notificationId: 1,title: index.PHP,status: 3,progress: 100}
D/DownloadWorker(28552): File downloaded
I/WM-WorkerWrapper(28552): Worker result SUCCESS for Work [ id=633dd93d-99e3-46e2-937d-a4782d62a569,tags={ Flutter_download_task,vn.hunghd.Flutterdownloader.DownloadWorker } ]

解决方法

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