Connection to LocalHost/10.0.2.2 from Android Emulator timed out

Question

Although this question has been asked multiple times in StackOverflow and I went through many of them, still I couldn't resolve my issue or I am not able to find out the root cause of the issue. Hence, posting a new question.

Below are the list of links I went through --

Here goes my code --

protected Void doInBackground(Void... params)
    {
        try
        {
            HttpURLConnection connection = null;

            URL url = new URL("http://10.0.2.2:8080/android_connect/user_registration.php");
            connection = (HttpURLConnection)url.openConnection();
            connection.setDoOutput(true);
            connection.setDoInput(true);
            connection.setRequestMethod("POST");
            connection.setUseCaches(false);
            connection.setConnectTimeout(720000000);
            connection.setReadTimeout(72000000);
            connection.connect();

            OutputStreamWriter output = new OutputStreamWriter(connection.getOutputStream());
            output.write(emp_details.toString());
            output.flush();
            output.close();

            HttpResult = connection.getResponseCode();

            connection.disconnect();
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
        return null;
    }

I am trying to connect Android with MySQL database using PHP through WAMP server. The PHP file (user_registration.php) is being saved in the below path --

C:\wamp\www\android_connect

Now after executing the code, I am getting an error like "java.net.SocketTimeoutException: failed to connect to /10.0.2.2 (port 8080) after 720000000ms: isConnected failed: ETIMEDOUT (Connection timed out)".

I went through the particular link in order to resolve this issue --

Android connection to localhost

But could not understand how it has been resolved! :)

Can you please help me in this case? Please note I am using Android Studio for my build.

Thanks in advance!

score 11 · Answer 1 · answered Nov 17 '16 at 19:20

Making a connection from your Android to your Computer is working with 10.0.2.2 only on an Google Android Virtual Device. Android Virtual Devices are listening for 10.0.2.2 and forwarding all the requests to your computer.

Genymotion Android Virtual Devices are listening on 10.0.2.3 and forwarding those requests to your computer.

10.0.2.2 is not working with your real Android device. If you want to use it with your real device you have to set the IP of your computer, as it has been suggested by a previous answer.

It’s `10.0.3.2` for recent versions of Genymotion, see https://stackoverflow.com/a/18940022/2139664 — Paul Götze, Apr 23 '19 at 10:05

score 9 · Accepted Answer · edited Jan 16 '19 at 11:56

9

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

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.
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.

edited Jan 16 '19 at 11:56

kkarakk

927
6
18

answered Feb 18 '16 at 16:16

Saumik Bhattacharya

815
1
12
26

7

Could you explain "So I changed the IP Address from 10.0.2.2 to the IPv4 address"? Thanks – speedynomads Jun 10 '16 at 11:16
I was using 10.0.2.2 as my IP address in my code, which was incorrect. Hence I changed it to the IPv4 address. Then it started working. – Saumik Bhattacharya Jun 10 '16 at 18:06
5

What is the IPv4 address? – speedynomads Jun 13 '16 at 10:35
6

@domji84 -- Go to `Command Prompt`, and type `ipconfig`, it will list out the IP addresses. There you can find `IPv4` address. – Saumik Bhattacharya Jun 14 '16 at 06:31

score 0 · Answer 3 · answered Aug 29 '18 at 11:08

0

Why to go for localhost or any ip address to run on emulator or real device simply go for ngrok to convert the localhost as a global address with very convenient and simplest way.

answered Aug 29 '18 at 11:08

Zafar Imam

169
1
11

score 0 · Answer 4 · answered Feb 26 '21 at 00:13

In my situation, I had this code running on my android device:

private static final String BACKEND_URL = "http://10.0.2.2:4242/"; // 10.0.2.2 is the Android emulator's alias to localhost

But my server code was running on my PC. So since my PC and my android device are "not the same device", that's why "http://10.0.2.2:4242/" didn't work. Solution was to change "http://10.0.2.2:4242/" to "https://<IP_OF_SERVER>:4242/"

Connection to LocalHost/10.0.2.2 from Android Emulator timed out

4 Answers4

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