安卓第一天笔记

1G:模拟制式2G:GSM/CDMA2.5G:GPRS2.75G:EDGE3G:WCDMA/CDMA2000/TD-SCDMA3.5G/3.75G:HSDPA/HSUPA/HSDPA+4G:TD-LTE(Longtermevolution)长期演进GSM:9K-->GPRS:42K-->EDGE:172K-->WCDMA:364k-->HSDPA/HSUPA:14.4M-->HSDPA+/HSUPA+:42M-->FDD-LTE:300M从上到下:Application应用程序层---------JAVA写ApplicationFramework应用程序框架层-----------JAVA写L