Android : Display "Download failed" message when application is cleared from the recent apps in mobile

I am developing a project using services from AWS S3 client (Amazon Web Services) . I view the contents from my respective bucket. If the content is a file, Then i use the object of TransferManager and Download the file. The Download class is of AWS itself. I have written a fragment for downloading. The problem i am facing is, when i clear the app from the recent activity in my phone while the download is running, then the file isnt downloaded. How and where do i display a toast message :Download failed", when the application is cleared from the recent apps? Thank you in advance.