private Button btn_login;
private EditText mUser;
private EditText mPass;
private EditText amountEdit;
private EditText resultEdit;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Button button = (Button)findViewById(R.id.login);
    button.setOnClickListener(this);
}


public void onClick(View view) {
    EditText mUser = (EditText) findViewById(R.id.usuario);
    EditText mPass = (EditText) findViewById(R.id.senha);
    //amountEdit = (EditText) findViewById(R.id.amount_edit);
    resultEdit = (EditText) findViewById(R.id.TESTE);
    String CGC = "82270711000140";
    String ENTIDADE = "0";
    String RETORNO = null;
    String SENHA = mPass.getText().toString();
    String TIPO = null;
    String USERNAME = mUser.getText().toString();
    wsconnect service = new wsconnect();
    String result = service.Convert(CGC, ENTIDADE, RETORNO, SENHA, TIPO, USERNAME);
    resultEdit.setText(result);
    System.out.println(result);
}

import org.ksoap2.SoapEnvelope;
    import org.ksoap2.serialization.SoapObject;
    import org.ksoap2.serialization.SoapPrimitive;
    import org.ksoap2.serialization.SoapSerializationEnvelope;
    import org.ksoap2.transport.HttpTransportSE;

public String Convert(String CGC, String ENTIDADE, String RETORNO, String SENHA, String TIPO, String USERNAME) {
    SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);
    request.addProperty("CGC", CGC);
    request.addProperty("ENTIDADE", ENTIDADE);
    request.addProperty("RETORNO", RETORNO);
    request.addProperty("SENHA", SENHA);
    request.addProperty("TIPO", TIPO);
    request.addProperty("USERNAME", USERNAME);

    SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
    envelope.dotNet = true;
    envelope.setOutputSoapObject(request);
    try {
        HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
        androidHttpTransport.call(SOAP_ACTION, envelope);
        SoapPrimitive result = (SoapPrimitive) envelope.getResponse();
        return result.toString();
    } catch (Exception e) {
        return e.getMessage();
    }
}