How to test my android app in all sdk versin of android?

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I developed one application in sdk 2.1. Now i want to test this in all sdk version. I trying to test in 2.2 ,1.6,1.5. But all get failed ,all throw exception. what are the changes I need be do in application to work in all sdk?

Please anyone help me to solve this issues.

Thanks

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Is your manifest set up to run in all versions of the code you are testing? Try looking at the API documentation on the subject.

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just set minsdkVersion in manifest file to 3. than your app will run on 1.5 and 1.6 also.