Error connecting with Webservice + Soap + Android

Question

Good afternoon, I am having a problem connecting to the webservice. I am using ksoap2 library.

public class CallSOAP
{
    public final String SOAP_ACTION = "http://tempuri.org/yteste";
    public  final String OPERATION_NAME = "yteste";
    public  final String WSDL_TARGET_NAMESPACE = "http://tempuri.org/";
    public  final String SOAP_ADDRESS = "http://192.168.2.101/WebService.asmx";

public CallSOAP()
{
}

public String Call(EditText edtQtde)
{

    SoapObject request = new SoapObject(WSDL_TARGET_NAMESPACE,OPERATION_NAME);

    SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(
            SoapEnvelope.VER11);
    envelope.dotNet = true;
    envelope.setOutputSoapObject(request);

    HttpTransportSE httpTransport = new HttpTransportSE(SOAP_ADDRESS);
    SoapPrimitive response = null;
    try
    {
        httpTransport.call(SOAP_ACTION, envelope);
        response = (SoapPrimitive)envelope.getResponse();
    }
    catch (Exception exception)
    {
        edtQtde.setText("erro do call");
        //response = exception.toString();
    }
    return response.toString();
}

The error occurs in "Sponse = (Soapprimitive)envelope.getresponse();", and ends up falling in catch() where I put an error message.

Main class:

public class MainActivity extends AppCompatActivity {

Button btnAdicionar;
EditText edtQtde;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    btnAdicionar = (Button)findViewById(R.id.btnAdicionar);
    edtQtde = (EditText)findViewById(R.id.edtQtde);

    final AlertDialog ad=new AlertDialog.Builder(this).create();

    btnAdicionar.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View arg0) {

            CallSOAP cs = new CallSOAP();

            try
            {
                String resp = cs.Call(edtQtde);
                ad.setMessage(resp.toString());
            }catch(Exception ex)
            {
                ad.setMessage("erro");
            }
            ad.show();
        }
    });
}

}

Note: The yteste function only returns a string.

Thank you

Answer 1

There are some errors in your code:

1. The error is caused because you are trying to make an HTTP request on thread home. This is a serious error on Android.

2. Your class that handles web request CallSOAP should not receive a reference to a View. In the case, the EditText edtQtde.

To solve this problem, you need to run the method Call in a background thread.

I recommend you take a look at the class documentation Asynctask or an explanation of how to run codes in the background.

Using the AsyncTask, you must do the Call in the background and update your Views as a result:

@Override
protected String doInBackground(Void... params) {
    CallSOAP cs = new CallSOAP();
    String resp;
    try {
        resp = cs.Call();
    } catch (Exception ex) {
        resp = "erro";
    }
    return resp;
}

@Override
protected void onPostExecute(String s) {
    super.onPostExecute(s);
    edtQtde.setText(s);
    ad.setMessage(s);
    ad.show();
}