compatibility Android 3.* with android 4

I want to build Android application. My target devices is tablets (not smartphones). Today exist only 3.* version of android OS, aimed for tablets. Is it normal if i begin build application for tablets in 3.* API? The tablets which will be release with android 4.0 (ice cream sandwich) can to run my application built on 3.0 API? Or me better to wait for 4.0 API if my target devices is tablets? Generally, in which version of API to develop my app for tabl开发者_如何学Cets? Thanks.

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I'm pretty sure that the applications which run on Android 3.* will run on Android 4.* too, because there is no point of making and OS if the old application will not run and all the developers have to build their applications for the next version. So I suggest to build your application for Android 3.* if your target devices are tablets.

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Android documentation says that all their SDK releases are forward friendly and that seems to be the case when using an emulator. I have an application that was written in 2.0, recently upgraded to 2.1 and we have some people in the office that have XOOM tablets (3.0) and we cant get it installed.

After some modifications to the manifest (suggested steps from droid dev portal) it still wont install on the XOOM at all.

If you are targeting tablets then i would start with 3.0. If there are features in 3.1 that you can't live without then have fun.