DownloadManager throws SecurityException on Android Q

Question

Download Manager gets the error below on Android 10 devices. The target version is 29.

I added android:requestLegacyExternalStorage="true" tag to the Manifest, but it didn't work.

java.lang.SecurityException: Unsupported path /storage/emulated/0/Contents/Awesome App.apk

Here is the code

public static void startDownload(Context context, String url, String token, String subPath) {

    DownloadManager.Request request;
    DownloadManager manager = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);
    Uri uri = Uri.parse(url);  // A url to download a file

    try {
        request = new DownloadManager.Request(uri);
        request.addRequestHeader("X-Auth-Token", token);
    } catch (IllegalArgumentException e) {
        e.printStackTrace();
        return;
    }

    request.setVisibleInDownloadsUi(true);
    request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE);

    try {
        File downloadFileDir = new File(Environment
                .getExternalStorageDirectory().getAbsolutePath() + "/Contents");

        if (downloadFileDir != null) {
            if (!downloadFileDir.exists()) {
                downloadFileDir.mkdirs();
            }

            File file = new File(downloadFileDir.getAbsolutePath() + File.separator + subPath);
            // subPath is name of the file to download. e.g. Awesome App.apk
            if (file.exists()) {
                file.delete();
            }

            Uri localUri = Uri.fromFile(file);
            request.setDestinationUri(localUri);
            if (localUri != null) {
                request.setMimeType(MimeTypeMap.getSingleton().getMimeTypeFromExtension(MimeTypeMap.getFileExtensionFromUrl(localUri.toString())));
            }
        }
    } catch (SecurityException e) {
        e.printStackTrace();
    }

    request.setTitle(subPath);
    request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);

    try {
        manager.enqueue(request);
    } catch (SecurityException e) {
        e.printStackTrace();
        //Got exception here
    }
}

Will test it later. For now: `downloadFileDir.mkdirs();` Check the return value . If it is false return. Adapt your code please. — blackapps, Dec 24 '20 at 16:22
`file.delete();` Check the return value and handle accordingly. Please adapt your code. — blackapps, Dec 24 '20 at 16:23
Requesting legacy external storage has no effect on the DownloadManager. — blackapps, Dec 24 '20 at 16:24

score 2 · Accepted Answer · answered Dec 24 '20 at 16:33

2

/storage/emulated/0/Contents/Awesome App.apk

In an Android 10 device the DownloadManager will not download to your own directories on external storage.

You need to use one of the already available public directories like Document, Download, DCIM, Music and so on.

So you can let download to

/storage/emulated/0/Music/Contents/Awesome App.apk

No need to create your subdirectory yourself as the download manager will do it.

You app does not need any permission to let the download manager execute its task.

answered Dec 24 '20 at 16:33

blackapps

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Thanks for your help, it works. I updated code such as `downloadFileDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).getAbsolutePath() + "/Contents");` I found what you mentioned in official documentation: https://developer.android.com/reference/kotlin/android/app/DownloadManager.Request.html#setdestinationinexternalpublicdir – Perihan Mirkelam Dec 24 '20 at 22:40

DownloadManager throws SecurityException on Android Q

1 Answers1