How to Forward My Localhost Ip-Address to an Android Emulator

How can I forward my localhost IP-Address to an Android Emulator?

To forward a port from your local machine to an Android Emulator, you need to have Telnet enabled. This is done through the Control Panel -> Programs and Features -> Turn Windows features on or off -> scroll down to Telnet Client. Then select it & press Ok. Now from your command prompt (with the Emulator running) you type telnet localhost "EmulatorPortNumber". The "EmulatorPortNumber" can be found in the titlebar of the Emulator, in my case it was 5554.

You will now see something similar to this:

Android Console: type 'help' for a list of commands
OK

Here, you want to type with as little as possible typo's, as when you apply the backspace, it will corrupt your command and not accept it. The command you have to use here is redir. This will let you choose from 3 subcommands:

list    list current directions
add     add new redirection
del     remove existing redirection

The one you need now is add. But you can't use it just like that. Typing redir add will give you the following line:

KO: bad redirection format, try (tcp|udp):hostport:guestport

This means that you have to specify what kind of port you want to forward (TCP or UDP port), which port on the local machine you want to forward (hostport) & which port you want to set on the Emulator (guestport).
So, using a command like this:

redir add udp:1337:12345

forwards the UDP port 1337 on the local machine to port 12345 on the Emulator. Be cautious about deleting redirections, as they might crash your Emulator. You can also simply close the Emulator to remove any redirections. It's easier & safer...

How to connect to my http://localhost web server from Android Emulator

The localhost refers to the device on which the code is running, in this case the emulator.

If you want to refer to the computer which is running the Android simulator, use the IP address 10.0.2.2 instead.

You can read more from here.

How do you connect localhost in the Android emulator?

Thanks, @lampShaded for your answer.

In your API/URL directly use http://10.0.2.2:[your port]/ and under emulator setting add the proxy address as 10.0.2.2 with the port number. For more, you can visit: https://developer.android.com/studio/run/emulator-networking.html

How can I access my localhost from my Android device?

USB doesn't provide network to mobile device.

If both your desktop and phone are connected to the same WiFi (or any other local network), then use your desktop IP address assigned by the router (not localhost and not 127.0.0.1).

To find out the IP address of your desktop:

• type into the command line ipconfig (Windows) or ifconfig (Unix)
  
  
  • on Linux the one-liner ifconfig | grep "inet " | grep -v 127.0.0.1 will yield only the important stuff
  • there's a bunch of suggestions on how to have a similar output on Windows
• there's going to be a bunch of IP's
• try all of them (except the forementioned localhost and 127.0.0.1)

If your phone is connected to the mobile network, then things are going to be harder.

Either go hardcore:

• first find out your router external IP address (https://www.google.de/search?q=myip)
• then, on the router, forward some port to <your desktop IP>:<server port number>
• finally use the external IP address and forwarded port

Otherwise use something like xip.io or ngrok.

NOTE: The ifconfig command has been deprecated and thus missing by default on Debian Linux, starting from Debian stretch. The new and recommended alternative for examining a network configuration on Debian Linux is ip command. For example to use ip command to display a network configuration run the following:

ip address

The above ip command can be abbreviated to:

ip a

If you still prefer to use ifconfig as part of your daily sys admin routine, you can easily install it as part of the net-tools package.

apt-get install net-tools

Reference is here

Port forwarding local server to Expo android emulator

You can access host machine from inside the android emulator by going to the address 10.0.2.2 inside the emulator.

For example if you have a web service accessible on localhost:8080 on your local machine, you can access the same by typing

http://10.0.2.2:8080 

from inside the emulator. More details about emulator networking you can read in the official documentation

How to connect to the localhost of an Android emulator?

You can do that with adb forward. See port forwarding

adb forward tcp:3000 tcp:3000

Then on your computer you can connect to http://localhost:3000 and it will be routed to port 3000 of the emulator.

Android Emulator, Forward port to public interface, not localhost

I've successfully used stcppipe to achive that. It just forward TCP connections to any of local machine interfaces to a specific IP address (in your case it will be localhost).

It can be download from Luigi Auriemma

Run it with:

stcppipe.exe localhost port port

Regards.

Connection to LocalHost/10.0.2.2 from Android Emulator timed out

I have figured out the reason why it was not working.
There were two issues --

1. The IP Address was not correct. So I changed the IP Address from 10.0.2.2 to the IPv4 address - which can be obtained on windows by typeing ipconfig in the command prompt and see link for linux.

2. Also the port number 8080 was not correct. I have set my own port number in httpd.conf file, like
   ##Listen 12.34.56.78:8383Listen 0.0.0.0:8383Listen [::0]:8383##, under Apache and I used the same.

After changing both and re-starting the WAMP server, it worked like a charm.

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