NetGuard

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NetGuard is a firewall application that gives users the tools they require to filter out the network traffic, without the need to have root access. Read more about NetGuard  

Powerful firewall solutions usually require root access to Android devices, and that’s not always possible. In fact, it’s likely that most users won’t have root access to their device and many don’t even want to fiddle with this kind of “power.”
This is where NetGuard comes into play. It’s a firewall solution that doesn’t require users to have root access on their phone. Furthermore, it uses a simple and easy interface that’s clear and that doesn’t require any prior experience.
With the help of the NetGuard, users will be able to reduce data usage, save the battery life, increase the degree of privacy, and have better general control over what’s happening with the information in your device.