HttpHostConnectionException - Android

Try to open the api from the genymotion browser using the ip network inderezo (something like 192.168.x.x)

If you are referring to a localhost of your device use http://10.0.2.2/ instead of http://127.0.0.1/ or http://localhost / .

Because your Android emulator is running on a virtual machine (QEMU) and you can not connect to a server running directly on your PC.

So your url should look like this:

HttpPost post = new HttpPost("http://10.0.2.2:8080/SOMENTE_EXEMPLO_QUALQUER");

Another thing, check if in your xml there is this permission:

<uses-permission android:name="android.permission.INTERNET" />

Have you tried using the HttpUrlConnection ? Home I'll paste here a class I made for testing, using the HttpUrlConnection that sent an XML to a WebService SOAP. Home I believe the principle is the same ... you will execute a POST in your WebService and receive a return. The way the files are handled you can adapt. I would recommend testing to adapt this code - even if it is a bit dirty and experimental - to test if it is not a question in the implementation of HttpClient / HttpUrlConnection that I did ... I tried to run the APP on a device on the network and test? As I do not know how GSon works, I'm not sure if you can adapt it completely to this form but sometimes it's good to test a totally different code, it might help you find what is causing you this problem. Hope it helps.
This code was based on another stackoverflow question in English, but unfortunately I could not find the link to paste here.

    //Variaveis globais
    public static final String link = "http:\www.webservice.domain.com.br/webserviceEtc"; //Url do webservice
    private String xmlHeader; //String para o xml a ser enviado
    private String retorno; //Retorno para gravar no xml a saida

    @Override
    protected void doInBackground(Object[] params) {
        //Recebendo a string/xml que sera repassada ao webservice - Primeiro parametro obrigatorio do AsyncWebCall
        xmlHeader = params[0].toString();
        //Chamando o metodo WebServiceConnection, que exige o o xml a ser enviado ao webservice, e devolve a resposta obtida
        retorno = WebServiceConnection(xmlHeader);
    }

    /*
    * Executado após o doInBackground terminar
    * */
    @Override
    protected void onPostExecute(String result) {
        //Altera o texto do TextView, passando o retorno devolvido pelo webservice
        textView.setText(retorno);
        super.onPostExecute(result);
    }


    /*
    * Função que trata a conexão com o webservice, envia o xml e retorna a resposta
    * */
    private String WebServiceConnection(String xmlString) {

        //Declaração de variaveis
        String retorno = ""; //String que recebera o retorno do xml de resposta do webservice
        InputStream responseInputStream = null; //Carrega a String que sera transformada em arquivo xml para enviar ao webservice
        OutputStream requestOutputStream = null; //Recebe a String/xml de retorno do site
        HttpURLConnection httpURLConnection = null; //Usado para criar a conexão da requisição

        try {
            //Declaração de variaveis
            String inputLine; //Usado para escrever

            //Tenta criar uma url com a string 'link' declarada no inicio desta classe
            URL url = new URL(link); //

            // Configurando a url para o envio da requisição
            httpURLConnection = (HttpURLConnection) url.openConnection();
            httpURLConnection.setDoOutput(true);
            httpURLConnection.setConnectTimeout(15000);
            httpURLConnection.setRequestProperty("Accept-Charset", "UTF-8");
            httpURLConnection.setRequestProperty("Content-Type", "text/xml");

            // Enviando request
            requestOutputStream = httpURLConnection.getOutputStream();
            requestOutputStream.write(xmlString.getBytes("UTF-8"));

            //Recebe o retorno do webservice para ser tratadoa
            responseInputStream = httpURLConnection.getInputStream();

            //Cria um leitor para a string/xml retornada pelo site
            BufferedReader in = new BufferedReader(new InputStreamReader(responseInputStream));

            //Loop para pegar as informações lidas pelo buffer
            while ((inputLine = in.readLine()) != null) {
                retorno = inputLine; //Repassando as informações lidas do buffer, para a string que sera o retorno
                System.out.println(inputLine);
            }
            in.close(); //Fechando o buffer de leitura do xml
            System.out.println("AsyncCallWS: WebServiceConnection: " + retorno);
            return retorno;

        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (SocketTimeoutException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return "Erro";
    }
}