Android - DownloadManager - clear old queued downloads

Question

I am creating an application that should know for concurrency reasons if all downloads are complete. A certain function is allowed to run only after all my downloads have been completed.

I managed to write a function that checks the queue for old downloads:

DownloadManager dm = (DownloadManager) context.getSystemService(context.DOWNLOAD_SERVICE); Query q = new Query(); q.setFilterByStatus(DownloadManager.STATUS_FAILED|DownloadManager.STATUS_PENDING|DownloadManager.STATUS_RUNNING); Cursor c = dm.query(q); 

The problem is that, to be sure - during initialization, I want to clear the queue and delete all entries.

Any ideas how I can delete entries now?

This function does not work for me because I do not want to physically delete files ... just an empty queue.

Any ideas?

Answer 1

Can you wait for DownloadManager to complete only your own downloads? To achieve this, you can save your download descriptors with the following:

 List<Long> downloadIds = new ArrayList<>(); downloadIds.add(downloadManager.enqueue(request)); 

Then you can request downloadManager as follows:

  Query q = new Query(); long[] ids = new long[downloadIds.size()]; int i = 0; for (Long id: downloadIds) ids[i++] = id; q.setFilterById(ids); Cursor c = downloadManager.query(q); Set<Long> res = new HashSet<>(); int columnStatus = c.getColumnIndex(DownloadManager.COLUMN_STATUS); while (c.moveToNext()) { int status = c.getInt(columnStatus); if (status != DownloadManager.STATUS_FAILED && status != DownloadManager.STATUS_SUCCESSFUL) { // There is at least one download in progress } } c.close(); 

Keep in mind that this can work if you are only interested in your own downloads, and not any possible downloads that might happen on the system.

Hope this helps.

Answer 2

If you do not want to physically delete the files, you can back them up before calling the remove DownloadManager function. This is not an elegant solution, but I can not find other ways.