Accessing localhost:port from Android emulator

user_803004 0
Viewed 272642

I'm running a web service on my local machine that runs at localhost:54722.

I want to call the service from an app running in the Android emulator.

I read that using 10.0.2.2 in the app would access localhost, but it doesn't seem to work with the port number as well. It says HttpResponseException: Bad Request.

android-emulator port localhost android
25 Answers

Since 10.0.2.2 is not a secure domain for Android you have to allow non-secured domains in your network configuration for API 28+ where non-TLS connections are prevented by default.

You may use my following configurations:

Create a new file in main/res/xml/network_security_config.xml as:

<?xml version="1.0" encoding="utf-8"?>
<network-security-config>
    <domain-config cleartextTrafficPermitted="true">
        <domain includeSubdomains="true">localhost</domain>
        <domain includeSubdomains="true">10.0.2.2</domain>
    </domain-config>
</network-security-config>

And point it in AndroidManifest.xml

<application
......
......
android:networkSecurityConfig="@xml/network_security_config">
user_22903690
user_4043390

I'm not sure this solution will work for every Android Emulator and every Android SDK version out there but running the following did the trick for me.

adb reverse tcp:54722 tcp:54722

You'll need to have your emulator up an running and then you'll be able to hit localhost:54722 inside the running emulator device successfully.

user_17004790

After running your local host you get http://localhost:[port number]/ here you found your port number.

Then get your IP address from Command, Open your windows command and type ipconfig enter image description here

In my case, IP was 192.168.10.33 so my URL will be http://192.168.10.33:[port number]/. In Android, the studio uses this URL as your URL. And after that set your URL and your port number in manual proxy for the emulator.

enter image description here

user_25358750

To access localhost on Android Emulator

  • Add the internet permission from AndroidManifest.xml
    <uses-permission android:name="android.permission.INTERNET" />

  • Add android:usesCleartextTraffic="true", more details here:

  • Run the below-mentioned command to find your system IP address:

ifconfig | grep "inet " | grep -v 127.0.0.1

Copy the IP address obtained from this step (A)

  • Run your backend application, which you can access at localhost or 127.0.0.1 from your sytem.

  • Now in android studio, you can replace the URL if you're using in code or You can use the ip address obtained from step(A) and try opening in web browser, Like this http://192.168.0.102:8080/

Don't forget to add PORT after the IP address, in my case app was running on 8080 port so I added IP obtained in (A) with the port 8080

user_117399050

For Laravel Homestead Users: If anyone using Laravel with homestead you can access app backend using 192.168.10.10 in emulator

Still not working? Another good solution is to use ngrok https://ngrok.com/

user_10224720

I am using Windows 10 as my development platform, accessing 10.0.2.2:port in my emulator is not working as expected, and the same result for other solutions in this question as well.

After several hours of digging, I found that if you add -writable-system argument to the emulator startup command, things will just work.

You have to start an emulator via command line like below:

 emulator.exe -avd <emulator_name> -writable-system

Then in your emulator, you can access your API service running on host machine, using LAN IP address and binding port:

http://192.168.1.2:<port>

Hope this helps you out.

About start emulator from command line: https://developer.android.com/studio/run/emulator-commandline.

user_15166520

Explanation why localhost is not available from emulators for anyone who has basic access problem. For sophisticated cases read other answers.

Problem: Emulator has own local network and localhost maps itself to emulator, but NOT your host!

Solution:

  1. Bind your server to 0.0.0.0 to make it available for emulator's network
  2. Get external IP address of your laptop: ifconfig command for Mac
  3. In Android (or Flutter app) use IP address of your external interface like: 192.168.1.10 instead of localhost
user_3116550
user_1929010

If you are working with Asp.Net Web API, in .vs/config folder inside your project, modify these lines as per you port setting. Let suppose you use port 1234 and physicalPath to the project folder set by IIS is "D:\My Projects\YourSiteName", then

<site name="YourSiteName" id="1">
                <application path="/" applicationPool="Clr4IntegratedAppPool">
                    <virtualDirectory path="/" physicalPath="D:\My Projects\YourSiteName" />
                </application>
                <bindings>
                    <binding protocol="http" bindingInformation="*:1234:*" />
                </bindings>
            </site>

In android studio, access your api with "http://10.0.2.2:1234" ...

user_69075180
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