Best way to convert iPhone 3-D game code to run on Android devices?

I need to convert our existing iPhone 3-D action game code to run on Android. Recently, I have developed 2-D game on Android platform and now I am moving towards 3-D. These days I am exploring the options to convert iPhone/iPa开发者_StackOverflow社区d & Symbian code to run on Android devices.

Should I write the entire code of iPhone 3-D game(previously written in Objective C using OpenGL ES) from scratch in Java using OpenGL apis, once again?

I have also successfully installed and studied samples of Android NDK(specially San Angles sample code) as well. I am also looking for 3- D game using OpenGL example in Android as well.

Is the use of Android NDK is recommended in order to convert iPhone code on Android platform or I should code in Java?

I am looking forward for piece of suggestions from your side.

Well that would be a hard ride...
If the Objective C code is clean and minimalistic it should be possible to do crosscompilation with an apropriate GCC with medium adaption. As Android ties to Java, often C wrappers for Java are needed to exploit system API features. Usually Java developers experience the other way round... Fortunately, OpenGL ES is natively available to C code.