Which is the best way to communicate from app to app in single device?

My idea is create Report Viewer application for both Android and IOS, (could be good on ReactNative also)

1. BaseApp: open ReportApp via URL_Scheme to register BaseApp URL_Scheme
2. ReportApp: send request to get json_spec to BaseApp
3. ReportApp: read api from spec, and send request back to BaseApp get and display data (table, chart,...)

I find some technologies, that I think it could solve my problem:

1. Inter Process Communication
2. Android Intent
3. Android Content Provider
4. Or, May I use custom REST server on my app

Anyone can give me the best way. Could you please give some docs or resources. Thank so much!