Retrofit Post form URLEncoded (java)

gistfile1.txt

    //https://square.github.io/retrofit/
    @FormUrlEncoded
    @POST("endpoint/")
    Call<LoginResponse> login(@Field("codigo_empresa") String username);
    
    
    String username = user.getText().toString().trim();
    Log.v("CONSOLE",username);
    Call< LoginResponse > loginResponseCall = ApiClient.getUserService ( ).login ( username );