setting Cookies in WebView android

I'm trying to set some cookies on my WebView to open a browser with the same session that I have on my app.

I read a lot of answers but they don't work for me. The only solution I've found is in the loadUrl, hardcode the cookie data in extraHeaders, but as expected this only works for this requests, and doesn't maintain the session.

The code that I have is:

CookieSyncManager cookieSyncManager = CookieSyncManager.createInstance(mWebView.getContext());
CookieManager cookieManager = CookieManager.getInstance();
cookieManager.setAcceptCookie(true);
cookieManager.removeSessionCookie();
cookieManager.setCookie("http://xx.xxx.example.com","mid="+MySession.GetSession().sessionId+" ; Domain=.example.com");
cookieSyncManager.sync();

String cookie = cookieManager.getCookie("http://xx.xxx.example.com");

Log.d(LOGTAG, "cookie ------>"+cookie);
mWebView.getSettings().setJavaScriptEnabled(true);
mWebView.setWebViewClient(new TuWebViewClient());
mWebView.loadUrl("http://xx.xx.example.com");

getCookie() returns the correct data, but when I read the cookies from the server, those are empty. What is wrong? Please advise. Thank you!!!