I’ve accidentally deleted the “Android 3.2” library (actually I wanted to replace it with “2.1”). Now I don’t know how to add it back.
Here is before deleting:

And here I have android platforms:

I tried “Add external JARs”, “Add Library” and others too but the end result is never the same as on the first screenshot and hence my app wont work).
ok, in Eclipse:
Window -> Android SDK Manager
Then install all the plattforms you want.
Then right click on project->properties->android and select the plattform you want 😉