If an app needs to download some critical data (without the data it
cannot function) of several MB, what is the best practice?

The app would start, a prompt would be shown to confirm download,
download would commence, and the user would be prevented from going
further until the download successfully completes.

I don't expect the download would take more than, say, 10 secs over
wifi but, of course, would take much longer over 2G.

Is a service absolutely essential for this?

Maybe there is already some code out there that takes a URL, downloads
it in a service, and broadcasts a configurable Intent when the
download has completed?

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