How access Android Plataform to use a ProgressBar?

Hi guys,

I’m working on a project in android and gear vr. I’m making a button with a circular progressbar. Except that the way I’m doing this is losing a lot of performance and frame rate. I would like to do using the of android / gear vr itself, got how?

How to access via blueprint? Or C ++?

How to access android classes and access progressbar?