Can I open the vtk files on my Android platform like KiwiViewer?

There are many 3D model viewers for Android (for example Emb3D is quite nice) which can open .obj files that can contain large number of objects. I did not search a lot, but couldn’t find one that can easily show/hide individual objects in the model (of a specific material in an .obj file).

You can view the Slicer scene on Android phone in virtual reality, but it requires a running desktop computer and currently you cannot interact with the models just view them.

There could be web-browser-based solutions as well. There are several websites that allows you to view 3D models on your phone, see for example https://sketchfab.com/.