AndroidServiceClient with Authentication

I'm currently researching ServiceStack as a replacement to my own services for handling REST between Android and Windows.

I've got the client (Android) working using loopj's AsyncHttpClient. But I was looking for a more native library. Initially I was using Jsonserviceclient but decided on the AndroidServiceClient. The problem I had was setting up basic authentication on the connection. After a few hours of reading JsonServiceClient.java (which AndroidServiceClient extends), it transpired I have to implement my own request ConnectionFilter and set up the request headers in the void exec(HttpURLConnection urlConnection) method.

After creating code, I got the error "cannot set request property after connection is made". Seems I needed to tweak the code to suppress this error.

CustomRequestFilter...

package com.jjoplc.pod.Views;

import android.util.Base64;
import net.servicestack.client.ConnectionFilter;
import java.net.HttpURLConnection;

/**
 * Created by norm on 01/07/2015.
 */
public class CustomRequestFilter implements ConnectionFilter {

    private String password = "";
    private String username = "";

    static  boolean done = false;
    public void exec(HttpURLConnection urlConnection) {
        if (done) {
            done = false;
            return;
        };

        done = true;

        String credentials = username + ":" + password;
        final String basicAuth = "Basic " + 
        Base64.encodeToString(credentials.getBytes(), Base64.NO_WRAP);
        urlConnection.setRequestProperty("Authorization", basicAuth);
    }

    public void setUsername(String userName) {
        this.username = userName;
    }

    public void setPassword(String passWord) {
        this.password = passWord;
    }
}

Set up.

 _androidClient = new AndroidServiceClient("http://myservice:8088");
_requestFilter = new CustomRequestFilter();
_requestFilter.setUsername("User");
_requestFilter.setPassword("Password");
_androidClient.RequestFilter = _requestFilter;

And test.

androidClient.getAsync(new dto.Hello().setName("Normski"), 
new AsyncResult<dto.HelloResponse>() {
    @Override
    public void success(dto.HelloResponse r) {
        view.setText(r.getResult());
    }

    @Override
    public void error(Exception ex) {
        view.setText(ex.toString());
    }
});