Check the network connection(a few DNS) with RxJava2

If you want to check the mobile network to see whether it is connected, you can try to call a few DNS with this tool. When calling,

• If one of the DNS is success, then the tool will callback at once, not need to wait for all the DNS success.
• Only when all the DNS are fail to connect, will the callback be called.

1.In the application, handle the extra exception in RxJava that when the Observer is dispose

ConnectionCheckUtil.initRxJavaDisposeErrorHandler()

2.Use the tool like this way:

ConnectionCheckUtil.connectionCheck(object : OnConnectionCheckListener {
            override fun onConnected() {
                //connected
            }
            override fun onDisconnected() {
                //not connected
            }
        })

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