How do I disable markup/annotation support on Android?

Q:

Can you tell me how do I disable annotation / mark-up in PDFNet Mobile SDK - for Android? Our app should not support annotations in this release

A: You just need to comment out (i.e. not call) PDFViewCtrl.setToolManager() in PDFViewCtrlDemo.java.
This will turn off all the tools/add-on features (which are also provided in the source code form to PDFTron licensees).