I want to display on the screen(Using Label) current version of my app.

• How I can do it?
• Where I need to set version variable if I using gradle?
• Or how I can get version from build.gradle file?
• Or how I can get version from external file like manifest to use it in build.gradle?

So:
How to display on the screen current version of my app, where I need to set this current version and how to use this version in gradle

I just don’t now how to do it