Android sdk 2.2

can we get API level 3 inbuilt in version 2.2 or we have to add it? as i 开发者_如何学JAVAam not able to update it .

If you compile your application as a 2.2 application, it should be working on lower API version provided you don't use any function/class that has been introduced later than that old API. What is the exact problem?