DownloadManager不适用于Android 10(Q) [英] DownloadManager not working for Android 10 (Q)

问题描述

针对这个问题，我已经花了很长时间了...我正在更新一个使用DownloadManger来执行简单任务的应用程序，例如将文件下载到外部存储公共目录，即:

I've been beating my head against this issue for quite awhile... I am updating an app that uses DownloadManger to do a simple task like downloading a file to the external storage public directory i.e:

Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS)

一切都可以从Android api 19-28正常运行.在API 29(Q/10)上进行测试时会出现问题.Android实现了范围存储，因此不赞成使用getExternalStoragePublicDirectory ...因此，我需要找出一个兼容的解决方案来支持API 19- 29 .我无法使用内部应用程序存储，因为DownloadManager会引发SecurityException.Android的文档指出，我可以使用DownloadManager.Request setDestinationUri ，对于Android Q，它甚至提到我可以使用 Context.getExternalFilesDir(String).但是，当我执行此操作时，该路径仍然是模拟路径:

Everything works fine here from Android api 19-28. Its when testing on API 29 (Q/10) is where issues occur. Android implemented scoped storage and so deprecated the getExternalStoragePublicDirectory... As a result I need to figure out a compatible solution to support APIs 19-29. I cannot use internal application storage since DownloadManager will throw a SecurityException. Androids documentation states that I can use the DownloadManager.Request setDestinationUri and it even mentions for Android Q that I can use Context.getExternalFilesDir(String). When I do this though, the path is still the emulated path:

/storage/emulated/0/Android/data/com.my.package.name/files/Download/myFile.xml

我从下载管理器收到一个回调，告知下载已完成(具有正确的ID)，但是我无法从保存它的区域中获取下载.我检查文件是否存在，并返回false:

I get a callback from the download manager that the download is complete (with right ID) but then I cannot grab the download from the area I saved it to. I check to see if the file exists and it returns false:

new File("/storage/emulated/0/Android/data/com.my.package.name/files/Download/myFile.xml").exists();

感谢您的帮助

添加上下文代码.因此，设置下载管理器

Adding code for context. So setting up download manager

    private void startDownload() {
        IntentFilter filter = new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE);
        registerReceiver(downloadReceiver, filter);

        String remoteURL= getString(R.string.remote_url);

        DownloadManager.Request request = new DownloadManager.Request(Uri.parse(remoteUrl));
        request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE);
        request.setTitle(getString(R.string.download_title));
        request.setDescription(getString(R.string.download_description));
        request.setDestinationUri(Uri.fromFile(new File(getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS), "myFile.xml")));

        DownloadManager manager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
        mainDownloadID= manager.enqueue(request);
    }

检查文件是否存在:

new File(getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS), "myFile.xml").exists(); //this returns false in the onReceive (and download IDs match)

推荐答案

尝试将其添加到应用程序标记中的清单文件中

Try add this into your manifest file in application tag

android:requestLegacyExternalStorage ="true"

android:requestLegacyExternalStorage="true"

这篇关于DownloadManager不适用于Android 10(Q)的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！