Unsure what your problem actually is, but I can assure you that the
Market does actually do this.

Upon download request the give the Market an sha of the application --
once done download it will check this. If this succeeds it will pass
the apk on to the package manager, which will then verify the
signature of the apk also :)

Tim

On Dec 2, 1:05 pm, Brian Conrad <[email protected]> wrote:
> Apparently the Market app does NO error checking for downloads.  Once
> again I had a user complaining my app wasn't working correctly.  I
> suggested he uninstall/reinstall and as a last resort he did so and that
> solved the problem.  Apparently though the app was corrupted during
> download it still ran. I had another case where the custom font wasn't
> displaying and the uninstall/reinstall solved that for the user.  How
> many of you are wasting time chasing down bugs which are really nothing
> more than a corrupted download?  Seems to me when a user downloads they
> could first send the MD5sum then after the download see if it matches
> before installation.

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