Here's the most recent official platform versions distribution:
http://developer.android.com/resources/dashboard/platform-versions.html
1.5 + 1.6 = 5.3% so not that much anymore these days. If your app is
quite basic (not using any fancy 1.6+ SDK functionality), you might as
well still support 1.5 and higher, because it should not cost you much
in time & effort (that is: build for 1.5, Android takes care of
scaling etc).
As the first replier says, you can suffice with only images in the
'drawable' dir in that case, Android will scale for you. But you
images might get blurry at a certain point device size. In that case
you indeed can put higher resolution images in the HDPI folder. Of
course you know about this page that explains a lot:
http://developer.android.com/guide/practices/screens_support.html

Re: the icons: I guess you can find them in the Android source code.
And yes it is still recommended practice to get a copy of them into
your app, in case they might get removed in some new Android version.

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