gStrategy, from which it will
 attempt to load a cached token during construction. Also, whenever the
 Session updates its token, it will also save the token and associated state
 to the TokenCachingStrategy.
 </p>
 <p>
 This is the only mechanism supported for an Android service to use Session.
 The service can create a custom TokenCachingStrategy that returns the Session provided
 by an Activity through which the user logged in to Facebook.
 </p></div>
</li>
</ul>
</div>
<div class="summary">
<ul class="b