how to change the Application Api level from 2.1 to 2.2

I have completed the application in 2.1 and now I have phone with android 2.2. What do I ne开发者_C百科ed to do in order to rebuild the application in 2.2?

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if you are using eclipse then it is very simple in project explorer click on

Project->properties->android->select target

and then build your project

also u need to change api level of menifest file