API 3：android 1.5
API 4：android 1.6
API 5：android 2.0
API 6：android 2.0.1
API 7：android 2.1
API 8：android 2.2
API 9：android 2.3
API 10：android 2.3.3
API 11：android 3.0（这个比较重要，fragment，loader，ActionBar等重要新特性的引入在此版本）
API 12：android 3.1
API 13：android 3.2
API 14：android 4.0
API 15：android 4.0.3
API 16：android 4.1.2
API 17：android 4.2.2
API 18：android 4.3.1
API 19：android 4.4.2
API 20：android 4.4w.2
API 21：android 5.0.1

Platform Version	API Level	VERSION_CODE	Notes
Android 5.0	21	LOLLIPOP	Platform Highlights
Android 4.4W	20	KITKAT_WATCH	KitKat for Wearables Only
Android 4.4	19	KITKAT	Platform Highlights
Android 4.3	18	JELLY_BEAN_MR2	Platform Highlights
Android 4.2, 4.2.2	17	JELLY_BEAN_MR1	Platform Highlights
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

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