Hello Tomash,
I'm the author of a new app ( PPV360HD) available on all Android devices (from 2.0, tablet or smartphone) that allows to see pano images up to 2.27GPixel from local storage, starting from the original jpeg image.
It's a very fast app, actually is online the version 1.0.3, with some major problems that I'm been resolving in the next few days.
there is also a limited demo version for evaluate purpose, to try first before buy, with a full hi-res public gallery (with images up to 500MPixel).
On my asus Prime and Galaxy S-II I can use smooth scroll and pinch zoom. I've tested the app on a old G1 (HTC-DESIRE), with success.
The app can be also executed on old android devices with a limited ammount of memory (and if you have some troubles, there is an option to use less memory).
Keep a try and let me know.