Ask questions if there apk 4.0 API, mounted on the machine, then 2.2

Ask a question, if there apk 4.0 API, installed on the 2.2 machine, so long as the API does not perform to 4.0 part of the code, should be safe, right?

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Security ....
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You can use try catch to handle, capture the corresponding error
For example ClassNotFoundError or NoSuchMethodError
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Build.VERSION.SDK_INT is the api level of the current system, you can use this to achieve different api level to go in a different process.
This is also a common way to adapt to a variety of android system version.
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Thank you, depending on the Build.VERSION.SDK_INT in, start a different class, or call a different function, good