android SDK build error

I have made a little game for android but when I build it, it ask me to select the folder where i installed SDK and when i select it, it freezes. So, what’s the problem, how can I fix it?

I’m getting the same thing. I hadn’t built for android in a while, so trying with Unity 3.3.0f4 threw an error that it couldn’t find the package required.
I ran the SDK manager and updated my Andoid SDK install, and now Unity just freezes (not responding) when I hit “OK” when promted for the Android SDK directory…

Have you tried removing the SDK Platform Packages in the SDK Manager up to Android 2.1? That fixed this issue for me.

See here: http://forum.unity3d.com/threads/71150-Unity-freezes-while-building-APK