I’m asking for Android specifically, but I’m curious what else is out there.
For example, some apps work without internet but may use it if it’s available. I might want to block that without having to turn off wifi, force stopping it, and wiping the cache/data.
Similarly, maybe I only want to use the app over a VPN and want to prevent accidentally opening it without first turning the VPN on.
You should be able to kind of do both through android settings
Settings -> Apps -> YourApp -> Mobile data usage -> Allow Network access and Mobile Data
For VPN you’ll need to add a VPN and then Settings -> Network and Internet -> VPN -> YourVPN -> Always on VPN and Block Connections without VPN. This blocks all apps. There is 2 issues with this though, Blocking connections will block split tunneling connections set up through VPNs and also potentially this depending on the apps you’re using https://mullvad.net/en/blog/dns-traffic-can-leak-outside-the-vpn-tunnel-on-android
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You should be able to kind of do both through android settings
Settings -> Apps -> YourApp -> Mobile data usage -> Allow Network access and Mobile Data
For VPN you’ll need to add a VPN and then Settings -> Network and Internet -> VPN -> YourVPN -> Always on VPN and Block Connections without VPN. This blocks all apps. There is 2 issues with this though, Blocking connections will block split tunneling connections set up through VPNs and also potentially this depending on the apps you’re using https://mullvad.net/en/blog/dns-traffic-can-leak-outside-the-vpn-tunnel-on-android
Does not work on samsung