Android version vs API Level

As new version of API released, you can bring more feature to your own apps.
However, those apps written by new API Level will not be assessable by old of Android version. Developer then get to make your own choice,

more new feature ? or more potential user?

Platform Version	API Level	VERSION_CODE	Notes
Android 4.1, 4.1.1	16	JELLY_BEAN	Platform Highlights
Android 4.0.3, 4.0.4	15	ICE_CREAM_SANDWICH_MR1	Platform Highlights
Android 4.0, 4.0.1, 4.0.2	14	ICE_CREAM_SANDWICH
Android 3.2	13	HONEYCOMB_MR2
Android 3.1.x	12	HONEYCOMB_MR1	Platform Highlights
Android 3.0.x	11	HONEYCOMB	Platform Highlights
Android 2.3.4 Android 2.3.3	10	GINGERBREAD_MR1	Platform Highlights
Android 2.3.2 Android 2.3.1 Android 2.3	9	GINGERBREAD
Android 2.2.x	8	FROYO	Platform Highlights
Android 2.1.x	7	ECLAIR_MR1	Platform Highlights
Android 2.0.1	6	ECLAIR_0_1
Android 2.0	5	ECLAIR
Android 1.6	4	DONUT	Platform Highlights
Android 1.5	3	CUPCAKE	Platform Highlights
Android 1.1	2	BASE_1_1
Android 1.0	1	BASE

As of  Aug 2012 with "Health and Fitness" apps, majority (58%) Android version is still in 2.3.3. Latest version 4.0.3 just get ~18. % share.

So, you get the answer





http://developer.android.com/guide/topics/manifest/uses-sdk-element.html#uses