failed to connect to localhost/127.0.0.1 android

Question

I am new to android development, and trying to call local .NET web api service in android via retrofit library. After starting my web api on IIS I am getting this error failed to connect to localhost/127.0.0.1 android.

When I did same thing as suggested http://themakeinfo.com/2015/04/retrofit-android-tutorial/, It's working fine, But my localhost service is not calling up from android

My service url is, http://localhost:52511/api/Values/getAllStudents/5

and it is giving me output in XML format in browser too.

I have also try to call it with,

public interface gitapi {
    @GET("/api/Values/GetProduct/{id}")      //here is the other url part.best way is to start using /
    public void getFeed(@Path("id") int id, Callback<gitmodel> response);
}

public class gitmodel {
    public int studentId;
    public String studentName;
    public String studentAddress;
}


String API = "http://10.0.2.2:52511";
public void CallService(View view){

        RestAdapter restAdapter = new RestAdapter.Builder().setEndpoint(API).build();
        gitapi git = restAdapter.create(gitapi.class);

        int id = 5;
        git.getFeed(id, new Callback<gitmodel>() {
            @Override
            public void success(gitmodel gitmodel, Response response) {
                Toast.makeText(getApplicationContext(), "Success", Toast.LENGTH_LONG).show();
            }

            @Override
            public void failure(RetrofitError error) {
                Toast.makeText(getApplicationContext(), "Errors", Toast.LENGTH_LONG).show();
            }
        });
}

but no luck.

Please tell me where do I need to change to make it work. ?

Response I am getting in browser is,

<ArrayOfstudents xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.datacontract.org/2004/07/APICall.Controllers">
<students>
<studentAddress>valsad</studentAddress>
<studentId>1</studentId>
<studentName>Keval</studentName>
</students>
<students>
<studentAddress>Hyderabad</studentAddress>
<studentId>2</studentId>
<studentName>Honey</studentName>
</students>
</ArrayOfstudents>

Showthrough

Your Android device won't be able to connect to localhost. You need to use an ip that's accessible over the LAN. Make sure you can access the address from the browser on your phone. – Belike

Thanks for reply, Please suggest any article which tells about accessing localhost on device and other configurations. – Showthrough

You are using 10.0.2.2. That will only work if your app runs on an emulator. You did not tell where your app runs on. A real device? – Interferometer

Yes, I want to run app on real device. But on emulator too is giving error with message, failed to connect to /10.0.2.2 (port 52511) after 15000ms. – Showthrough

For real device I am following this article "developer.chrome.com/devtools/docs/…", but no luck – Showthrough

Working url in browser is, localhost:52511/api/Values/GetProduct/5 and my IPV4 address is : 196.168.1.2. So, I am using url : 192.168.1.2:52511/api/Values/GetProduct/5 But it shows bad request. – Showthrough

You should try 192.168.1.2:52511 in a browser on your device. – Interferometer

Bad Request - Invalid Hostname (400) – Showthrough

You can try this once and check after firewall settings. (#45941361) – Monoplane

Does this answer your question? How to connect to my http://localhost web server from Android Emulator – Romie

Answer 1

Instead of using 127.0.0.1:<PORT> use your local IP

Titanism

Answer 2

There's nothing to do with retrofit library in your case.

It's about your network settings, your phone and IIS server must be the same LAN.

You can follow as below.

1. Launch an AP on you IIS server;
2. Connecting the AP with your phone.

Sometimes you need to close security firewall on your IIS server.

Vagary

Still I am not done with this issue, but answer shows me correct way :) – Showthrough

Working url in browser is, localhost:52511/api/Values/GetProduct/5 and my IPV4 address is : 196.168.1.2. So, I am using url : 192.168.1.2:52511/api/Values/GetProduct/5 But it shows bad request. – Showthrough

Answer 3

I had the same problem as u (failed to connect to localhost/127.0.0.1). First of all i recommend u to read this: android developer's guide (main part of this on the image↓)

I had all of this, mean A, B and C. As C(emulator) i used a Genymotion. And i solved my problem by changing Network Configurations on it.

IMPORTANT: my adress in baseURL were: "localhost:8099/"

Let's see it: U should click on Settings → Network → check Use HTTP Proxy → input your IP adress and Port(in my situation it was 8099) → close. See it more details on image ↓

Subplot

Answer 4

I have the same problem, and I resolve it by changing the IP address instead of 'localhost':

1. open cmd(if you are using windows): type 'ipconfig' and see your computer's ip.(make sure that your computer and your android device connect to the same network).
2. remove 'localhost' in the url and use the ip(ip of your computer in step 1).
3. run the project again and check

Cannonry

Answer 5

In retrofit if you are trying to use a server from localhost you need to change in the base retrofit URL to the IP Local of your machine (from windows use the ipconfig command in cmd, and copy the IPV4 address), and you also need to add this to the AndroidManifest.xml:

   <application
    ...
    android:usesCleartextTraffic="true"
    ...
   </application>

Remember to use http or https in the URL as you configured

Retrofit.Builder().baseUrl("http://<YOUR_IP_Local>:<Port>")

Strontia

Answer 6

Actually this helped when using 2 apps on the same Android device (Android 9)

android:usesCleartextTraffic="true"

Hermetic

Answer 7

You can try this in androidmanifest.xml

android:usesCleartextTraffic="true"

Mendes