Accessing an Android network server application

I wrote an Android application that acts as HTTP server by opening a socket and listening on port 8080. During development I used the QEMU-based Android emulator that is integrated with Android Studio. Simply sending requests to the emulated Android machine does not work, some preparation is necessary.

I used the post Android AVD Networking by rhill solutions as basis, which unfortunately only exists on the Internet Archive in 2022.


I had to setup port forwarding from my local machine to the Android emulator (AVD, Android Virtual Device). The first emulator has a management interface on port 5554, which you can connect to with telnet:

$ telnet localhost 5554
Connected to localhost.
Escape character is '^]'.
Android Console: Authentication required
Android Console: type 'auth <auth_token>' to authenticate
Android Console: you can find your <auth_token> in

auth thisismysecretaccesskey
Android Console: type 'help' for a list of commands

redir add tcp:8080:8080

Connection closed by foreign host.

This enabled the forwarding of requests to localhost:8080 to the Android application listening on port 8080 in the emulator:

$ curl -i localhost:8080/
HTTP/1.1 200 OK
Content-Type: text/html
Date: Wed, 20 Jul 2022 20:16:04 GMT
Connection: keep-alive
Content-Length: 1166
<!DOCTYPE html>
  <meta charset="utf-8"/>
  <h1>louyapi - local OUYA API server</h1>

Written by Christian Weiske.

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