java.net.ConnectException: localhost/127.0.0.1:8080 – Connection refused

Since you have not specified you are connected to a server from the device or emulator so I guess you are using your application in the emulator.

If you are referring your localhost on your system from the Android emulator then you have to use http://10.0.2.2:8080/ Because Android emulator runs in a Virtual Machine therefore here 127.0.0.1 or localhost will be emulator’s own loopback address.

Refer: Emulator Networking

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