The long-awaited Android Mobile OS v.2.2 (AKA “FroYo”) has officially  rolled out. Here is the 10 main Fctions of Android OS 2.2
1. The new increased application options "whole upgrade" or  "automatic upgrade" 

 New increased application  options are increased in Android 2.2
Taking privacy into account, Google asks users to conduct settings  when installing or updating applications. So, according to Android  platform users, this new function is fully practical. One of the great  features of Android is wide supporting kinds of applications. Android  2.2 applications do a great favor for users to reduce manual operation  especially the users installed many applications.
2. Android online application market keeps pace with the  PC-side
At present, users still are disable to browser Android application  market directly while the cost for network flow is so astonishing. So,  many users is deterred which caused the obstacle for Android  application's popularity and download.
3. Update system version freely
From FroYo age, if Google should allow users to download AndroidOS from  online application market or support site, that will undoubtedly brings  about great convenience for users.
4. Power management function
The largest problem Android phone users complaining about is its battery  life. No wonder, jumbo size HD touch-control screen, high-end  processor, multitasking, data synchronism, each of them has a great  power consumption. But there is no much battery energy needed when users  checking 
Twitter update or downloading, so, Android 2.2 is  expected to offer high/normal/low variety of energy consumption mode to  lengthen the time of battery endurance.
5. More pay modes
 
  Android 2.2 adds a variety of  pay modes
Now most users buy application with credit card, while some with PayPal.  But as a whole, purchase smooth need further simplification such as  adding new ebanking or directly putting the cost into network payment to  closing the book at the end of each month.
6. New music player
Android default music player is in regulation while much more mediocre  in Android 2.2 with special meaning. Music player mode need a better  file organization system to meet the demand browsing in different way.
7. SD-Based install mode of expansion storage card
Android platform users may put more concerns on this function, after  all, according to the former version of Android, if users want to  process and application install to a SD card, it has to take a long time  to achieve. If this rumour becomes true, users benefit greatly from it.
8. Advanced notice options
When discovering update or receiving e-mail, OS will give out the notice  information. The passed Android version has a clumsy notice options  setting, they will offer dependent and efficient management alternative  to users.
9. Sustaining USB/Bluetooth keyboard
USB keyboard needs the support of power which is hard to deal with;  while Bluetooth HID man-machine interface device has become the  important interaction incarnation of modern smartphone. In addition,  although the fight between Flash and HTML5 is not clear, authority  indicated that the next generation of AndroidOS is still supporting  Flash.
10. The storage for off-line maps
Map searching, which is in common use, creates the side effect great  bill volume in the end of a month. If Android could save the maps data  when network access (such as WiFi), then next time only less flow would  be able to complete searching.