I just wonder how can those apps block another apps on device or detect what i write on browser ?also they can block open all setting or only what i selected to block.I'm a mobile appliction develpor but i can't imagine how they work or what they depended on.I read that apps on android can't modify or close other apps or know which apps are in background or foreground because security reasons.so i need some your help to understand the whole process or some ideas about that.example apps : detoxify - blockerx
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