Android各个版本号，发行时间以及版本代号

1.0        2008-9-23, HTC Dread (G1) 
1.1        2009-2-9, T-Mobile G1
1.5        2009-4-30, Cupcake (纸杯蛋糕), Camera recording, Gallery etc…
1.6        2009-9-15, Donut(甜甜圈),Search, Display(支持WVGA) etc…
2.0        2009-10-26, Éclair(松饼),Sync, Email, System, Display etc …
2.1        2010-1-20, Éclair(松饼), 改动很小
2.2        2010-3-20，Froyo(冻酸奶),System, Application speed, Bluetooth etc…
2.3        2010-12-6, Gingerbread(姜饼),Nexus S, System, SIP/Voip,Camera, More sensors etc…
3.0        2011-2-22, Honeycomb(蜂巢),Moto Xoom tablet, no source code, for tablet…

4.0        2011-10-11 Ice Cream Sandwich(冰淇林三明治),三星 Galaxy Nexus, no source code