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Version for Blackberry OS

If I develop a Blackberry application for OS version 6.0, will the application be compatible with OS version 4.5? If not, is there a way to easily port the application?

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If you work with a specific SDK (for example, 6.0), your application will be deployed only on devices that use the corresponding OS version (6.0) in this case.

To develop applications specifically designed for different versions of the OS, you must create separate deployable executables for each version. Alternatively, you can build for the lowest common denominator - if you want to support OS 4.5, build for version 4.5 and your application will work (although not always gracefully) on all versions of the later version of BB.

Two open source projects that you can use as examples are BBSSH and LogicMail .

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For an example of a quality open source project that supports many versions of BB OS, check LogicMail .

ant build.xml loads platform-specific classes based on the target:

<if><isset property="jde460.home"/><then>
  <fileset id="bb460_fileset" dir="..">
    <include .../>
      ...

As far as I can tell, this project does not rely on a preprocessor.

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Source: https://habr.com/ru/post/1794398/

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