我的应用无法发送GET，OkHttp

Question

I have strange a problem.
I have service in localhost:8080 and everything is good configured, I can open this service in browser using by Android device ( real, not emulator ). In my opinion I have something wrong in my code.

But in app i got java.net.ConnectException: Failed to connect to localhost/127.0.0.1:8080

This is my code:

private void sendGET() {

        OkHttpClient.Builder client = new OkHttpClient.Builder();
        client.authenticator(new Authenticator() {
            @Override
            public Request authenticate(Route route, Response response) throws IOException {
                String credential = Credentials.basic("admin", "admin");
                return response.request().newBuilder().header("Authorization", credential).build();
            }
        });

        Request request = new Request.Builder()
                .url("http://localhost:8080/users")
                .build();

        client.build().newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                Log.w("http", e);
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                Log.w("http", response.body().string());
            }
        });

    }

What can be wrong here ?

Answer 1

There could be issues with how localhost is being mapped to an actual IP address. Try using your actual IP address:

Request request = new Request.Builder()
            .url("http://192.168.0.1:8080/users")  // for example
            .build();

The above assumes an IP address of 192.168.0.1 .

To find your IP address, type ipconfig on Windows or ifconfig on Linux.