Android SDK Version

I want to know about android version. In other software, lower version is mostly compatible with higher version. I du开发者_JAVA百科n get that android always ask higher SDK or ask same api version whenever I run the lower version of api or SDK. It should able to cope with it, shouldn't it? Another question is how do I download android SDK packages not from eclipse, coz it overwrite my existing SDK and I don't want to be like that. Thanks alot. I know that my quests are naive or I may be numb. But dun neglect me. Have a nice day ya'll.

well there is certain reason for android always asking higher SDK or at least same SDK version since new features continues to evolve through generations of sdk. If your current project created using 2.2 SDK then there would be a chance that some code using in 2.2 doesn't work with 2.1. About the SDK packages, there is a way to download SDK packages not from eclipse, but I certainly not recommend you to do so.