Unknown URL content://downloads/my_downloads

Question

I'm using Download Manger to download some multimedia files and categorize them. I'm also using Crashlytics and this is an error I frequently get on different devices and versions of Android:

java.lang.IllegalArgumentException: Unknown URL content://downloads/my_downloads    at android.content.ContentResolver.insert(ContentResolver.java:862)    at android.app.DownloadManager.enqueue(DownloadManager.java:1252)    at com.myapp.LessonFragment$DownloadClickListener.onClick(SourceFile:570)    at android.view.View.performClick(View.java:4262)    at android.view.View$PerformClick.run(View.java:17351)    at android.os.Handler.handleCallback(Handler.java:615)    at android.os.Handler.dispatchMessage(Handler.java:92)    at android.os.Looper.loop(Looper.java:137)    at android.app.ActivityThread.main(ActivityThread.java:4921)    at java.lang.reflect.Method.invokeNative(Method.java)    at java.lang.reflect.Method.invoke(Method.java:511)    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)    at dalvik.system.NativeStart.main(NativeStart.java) 

You can see my codes below:

private class DownloadClickListener implements View.OnClickListener {     @Override     public void onClick(View view) {         // Check if download manager available before request         if (!DownloadHelper.isDownloadManagerAvailable(getActivity())) {             // Build custom alert dialog             AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());             builder.setMessage(R.string.download_manager_disabled);             builder.setCancelable(false);             builder.setPositiveButton(R.string.ok, (dialog, which) -> {                 dialog.dismiss();             });             // Create and display alert dialog             AlertDialog dialog = builder.create();             dialog.show();             return;         }          // Display short toast on download clicked         Toast.makeText(getActivity(), R.string.lesson_download_start, Toast.LENGTH_SHORT).show();          // Get attach from view tag         Attache attache = (Attache) view.getTag();          // Get lesson using lesson id         Lesson lesson = new Select().from(Lesson.class)                 .where(Condition.column("id").is(attache.getLessonId()))                 .querySingle();          // Set file name from url and attache name         Uri uri = Uri.parse(attache.getFile());         String fileName = attache.getName() + '.'                 + MimeTypeMap.getFileExtensionFromUrl(attache.getFile());          // Check if path directory not exist and create it         String filePath = Environment.getExternalStorageDirectory() + "/myapp/" + lesson.getTitle() + "/";         File path = new File(filePath);         if (!path.exists() || !path.isDirectory()) {             if (!path.mkdirs()) {                 Timber.e("Could not create path directory.");             }         }          // Check if file exist and then delete it         File file = new File(filePath, fileName);         if (file.exists() && file.isFile()) {             if (file.delete()) {                 Timber.v("%s just deleted.", fileName);             }         }          // Create download manager request using url         DownloadManager.Request request = new DownloadManager.Request(uri);         request.setTitle(attache.getName());         request.setDestinationInExternalPublicDir("/myapp/" + lesson.getTitle(), fileName);          // Using DownloadManager for download attache file         DownloadManager manager = (DownloadManager) getActivity().getSystemService(Context.DOWNLOAD_SERVICE);         manager.enqueue(request);     } } 

Answer 1

For those who are getting Error Unknown URI: content://downloads/public_downloads. I managed to solve this by getting a hint given by @Commonsware in this answer. I found out the class FileUtils on GitHub. Here InputStream methods are used to fetch file from Download directory.

 // DownloadsProvider             else if (isDownloadsDocument(uri)) {                  final String id = DocumentsContract.getDocumentId(uri);                  if (id != null && id.startsWith("raw:")) {                     return id.substring(4);                 }                  String[] contentUriPrefixesToTry = new String[]{                         "content://downloads/public_downloads",                         "content://downloads/my_downloads",                         "content://downloads/all_downloads"                 };                  for (String contentUriPrefix : contentUriPrefixesToTry) {                     Uri contentUri = ContentUris.withAppendedId(Uri.parse(contentUriPrefix), Long.valueOf(id));                     try {                         String path = getDataColumn(context, contentUri, null, null);                         if (path != null) {                             return path;                         }                     } catch (Exception e) {}                 }                  // path could not be retrieved using ContentResolver, therefore copy file to accessible cache using streams                 String fileName = getFileName(context, uri);                 File cacheDir = getDocumentCacheDir(context);                 File file = generateFileName(fileName, cacheDir);                 String destinationPath = null;                 if (file != null) {                     destinationPath = file.getAbsolutePath();                     saveFileFromUri(context, uri, destinationPath);                 }                  return destinationPath;             }