'Show screen before another app starts in android studio

I'm doing an app that blocks the access to another apps when you have used them for an specific time, for example Facebook. So, my idea is to show a screen when you open the Facebook app that prevents you from accessing it but i don't know how to put my screen before these apps and block the acces.

Thanks! and if there's another way to do that would be nice you let me know. I'm using Java SDK API 21.

javaandroidandroid-studio


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