Be carefull because nostrmo has verification of event signatures turned off. It was working too slowly so main dev turned it off. In @yana I had to start using acinq android native lib so that it would be fast enought for acceptable usage and not freezing the UI. We will later try to make it in separate thread.
Discussion
Thank you for your advice. I don't use nostrmo, I just tried it. I wanted to use its multi-language translation option, which unfortunately had a bug and didn't work.