Retrofit的cookie的保存和添加都可以用Interceptor来实现
下面是接收请求中返回并保存cookie的代码示例:

public class ReceivedCookiesInterceptor implements Interceptor {
    private Context context;

    public ReceivedCookiesInterceptor(Context context) {
        super();
        this.context = context;

    }

    @Override
    public Response intercept(Chain chain) throws IOException {
      
        Response originalResponse = chain.proceed(chain.request());
        //这里获取请求返回的cookie
        if (!originalResponse.headers("Set-Cookie").isEmpty()) {
            final StringBuffer cookieBuffer = new StringBuffer();
            //最近在学习RxJava,这里用了RxJava的相关API大家可以忽略,用自己逻辑实现即可.大家可以用别的方法保存cookie数据
            Observable.from(originalResponse.headers("Set-Cookie"))
                    .map(new Func1<String, String>() {
                        @Override
                        public String call(String s) {
                            String[] cookieArray = s.split(";");
                            return cookieArray[0];
                        }
                    })
                    .subscribe(new Action1<String>() {
                        @Override
                        public void call(String cookie) {
                            cookieBuffer.append(cookie).append(";");
                        }
                    });
            SharedPreferences sharedPreferences = context.getSharedPreferences("cookie", Context.MODE_PRIVATE);
            SharedPreferences.Editor editor = sharedPreferences.edit();
            editor.putString("cookie", cookieBuffer.toString());
            editor.commit();
        }

        return originalResponse;
    }

向请求中添加cookie,代码如下:

public class AddCookiesInterceptor implements Interceptor {
    private Context context;

    public AddCookiesInterceptor(Context context) {
        super();
        this.context = context;

    }

    @Override
    public Response intercept(Chain chain) throws IOException {
        
        final Request.Builder builder = chain.request().newBuilder();
        SharedPreferences sharedPreferences = context.getSharedPreferences("cookie", Context.MODE_PRIVATE);
//最近在学习RxJava,这里用了RxJava的相关API大家可以忽略,用自己逻辑实现即可  
                Observable.just(sharedPreferences.getString("cookie", ""))
                .subscribe(new Action1<String>() {
                    @Override
                    public void call(String cookie) {
                        //添加cookie
                        builder.addHeader("Cookie", cookie);
                    }
                });
        return chain.proceed(builder.build());
    }
}

在Retrofit做如下设置即可在每次请求中保存和添加cookie:
本人使用的Retrofit2.0可能Retrofit1.9中代码略有不同,但这个思路应该也可以用在1.9版本中,希望对大家有所帮助

   public static OkHttpClient getClient(Context context) {
        OkHttpClient client = getUnsafeOkHttpClient();
        client.interceptors().add(new ReceivedCookiesInterceptor(context));
        client.interceptors().add(new AddCookiesInterceptor(context));

        return client;
    }