Unable to download file created by my app on Google Drive, But can get the metadata of that file

Question

I followed all the steps mentioned in google drive sdk. I created a sample application on my device(android, running jelly bean) and am able to upload a file on to drive. Wh

Answer 1

I don't think we need any Access Token to download a file. I had the same problem, and this worked:

private class DownloadFile extends AsyncTask {

    private com.google.api.services.drive.model.File driveFile;
    private java.io.File file;

    public DownloadFile(File driveFile) {
        this.driveFile = driveFile;
    }

    @Override
    protected Boolean doInBackground(Void... params) {
        if (driveFile.getDownloadUrl() != null
                && driveFile.getDownloadUrl().length() > 0) {
            try {
                HttpResponse resp = mDriveService
                        .getRequestFactory()
                        .buildGetRequest(
                                new GenericUrl(driveFile.getDownloadUrl()))
                        .execute();
                OutputStream os = new FileOutputStream(file);
                CopyStream(resp.getContent(), os);
                os.close();

                return true;
            } catch (IOException e) {
                e.printStackTrace();
                return false;
            }
        } else {
            return false;
        }
    }

    @Override
    protected void onPostExecute(Boolean result) {
        //use the file
    }
}

public static void CopyStream(InputStream is, OutputStream os) {
    final int buffer_size = 1024;
    try {
        byte[] bytes = new byte[buffer_size];
        for (;;) {
            int count = is.read(bytes, 0, buffer_size);
            if (count == -1)
                break;
            os.write(bytes, 0, count);
        }
    } catch (Exception ex) {
    }
}