How do I block an app from accessing the Internet on Android?

Note: Both the Internet and ACCESS_NETWORK_STATE permissions are normal permissions , which means they’re granted at install time and don’t need to be requested at runtime.

In the Android Mobile network settings, tap on Data usage. Next, tap on Network access. Now you see a list of all your installed apps and checkmarks for their access to Mobile data and Wi-Fi. To block an app from accessing the internet, uncheck both boxes next to its name .

STEPS:

You must have mostly used the google play services library, which contains INTERNET and ACCESS_NETWORK_STATE permissions.5 Kas 2011