Checking network connection

As we create applications that communicate with other devices and services over the Internet, eventually, we will want to verify that we have a network connection prior to making the network calls. Another thing to consider when we are writing mobile applications is the type of network connection that the user has. As mobile application developers, we need to keep in mind that our users probably have a mobile data plan that limits the amount of data they can send/receive in a month. If they exceed that limit, they may have to pay an extra fee. If our application sends large amounts of data, it might be appropriate to warn our user prior to sending this data.

This next example will show how we can verify that we have a network connection and also tells us what type of connection we have. We will begin by importing the system configuration API and also defining an enum that contains the different connection types. We will import the system configuration API like...