An android app is developed in android 4.0.3 ,api level-15,what we do in coding ,that this app is also running on higher version like 4.3 (jelly been)

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The whole 4 and above is Jelly Bean, and version are backward compatible so you do not have to anything. It is different story if you want to get new stuff on old version, classic examples are ActionBar and Fragments

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The whole 4 and above is Jelly Bean, and version are backward compatible so you do not have to anything. It is different story if you want to get new stuff on old version, classic examples are ActionBar and Fragments

Yes, newer versions of Android can run older applications, no problem.

All the above are true provided that the application is written in Java using the Android Dalvik virtual machine, which most Android applications are.

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