force an android app to run in a specified resolution

Hello,

I've been developing an app for iPhone and there's the possibility in build settings for iOS to specify a target resolution for the app to be displayed at. Now i'm converting the iPhone app i build for use on Android devices and i want to specify a target resolution, more specifically (hvga,320x480). In build settings this is not available as an option though, i guess my question is, is there any other way to achieve this? I've been looking into Screen.SetResolution but this didn't help me get the desired result. Some help or advice would be much appreciated :) Thank you for your time...