You re welcome

Thank you very much. I will try it.

If you want to combine Unity with Android code, you can either create an Android plugin and use it within Unity, or export a Unity project to an Android project that you can extend using Eclipse (or other Java IDE of your choice);

these options are illustrated in these 2 articles:

https://developer.vuforia.com/resources/dev-guide/unity-android-plugins

https://developer.vuforia.com/resources/dev-guide/extending-unity-android-activity-and-adding-custom-views-eclipse

Thank you for replying.  Because currently i am developing my app under android environment, so if i use Unity, i am not sure how to integrate unity code to my android code. And i never use Unity before, so i don't know how to start.

Hi, you can do this, of course, and you can start from the Image targets sample;

but this will require that you implement some ray-casting / picking algorithm to determine which part of the 3D model you are touching; or that you integrate some 3rd party library that has such functionality (Vuforia does not offer such functionality as part of the SDK).

Also, whatever solution you take, it is probably a good idea to split the model in 2 parst (the body and the handle), so to have distinct objects which can be identified by the ray-cast / pcking algorithm.

Also, have you considered using Unity ? This would make it much easier, as Unity already provides these kind of features.