Cancel Google Drive upload possible?

Question

I have written an app using the official API to upload to Google drive, this works perfectly. However I can\'t find anyway to cancel an upload. I\'m running it in an ASync

Answer 1

I've been looking for an answer for a long time as well. The following is the best I could come up with.

Store the Future object anywhere you want (use Object or Void):

Future<Object> future;

Call this code (Java 8):

try
{
    ExecutorService executor = Executors.newSingleThreadExecutor();

    future = (Future<Object>) executor.submit(() ->
    {
       // start uploading process here
    });

    future.get();            // run the thread (blocks)
    executor.shutdown();
}
catch (CancellationException | ExecutionException | InterruptedException e)
{}

To cancel, call:

future.cancel(true);

This solution hasn't produced any nasty side effects so far, unlike stopping a thread (deprecated), and guarantees a cancel, unlike interrupting.

Answer 2

In a comment I have said that putting the request in a thread and call interrupt is not working. So I was searching another way of doing it.

I have finally found one, an ugly one: Close the InputStream of the uploaded file!

I initialize with:

mediaContent = new InputStreamContent(NOTE_MIME_TYPE,new BufferedInputStream(new FileInputStream(fileContent)));
mediaContent.setLength(fileContent.length());

And in a stop listener I have :

IOUtils.closeQuietly(mediaContent.getInputStream());

For sure it should be possible to do it in a better way!

Regards

Answer 3

Great question! I filed a feature request for the ability to cancel a media upload request:

https://code.google.com/p/google-api-java-client/issues/detail?id=671

However, this may a difficult feature to implement based on the current design of that library.

Another option to consider is to not use AsyncTask and instead implementing the multi-threading yourself and abort the running Thread. Not pleasant, but may be your only option for doing this now.

Answer 4

I've found a nasty way to do it. I am developing an android app, but I assume similar logic can apply to other platforms

I've set a progressListener to the upload request:

uploader.setProgressListener(new MediaHttpUploaderProgressListener() {
    @Override
    public void progressChanged(MediaHttpUploader uploader) throws IOException {
        if (cancelUpload) {
            //This was the only way I found to abort the download
            throw new GoogleDriveUploadServiceCancelException("Upload canceled");
        }
            reportProgress(uploader);
    }
});

As you can see, I've used a boolean member that is set from outside when I need to abort the upload. If this boolean is set to true, then on the next update of the upload progress I will crash, resulting in the abortion of the request.

Again, very ugly, but that was the only way I found to make it work