android/accounts/AccountManager.html">AccountManager</a></code> failure. The only way to discover whether a token is expired or not
is to contact the server, and it would be wasteful and expensive for <code><a href="../../reference/android/accounts/AccountManager.html">AccountManager</a></code> to continually go online to check the state of all of its tokens.
So this is a failure that can only be detected when an application like yours tries to use the auth
token to access an online service.</p>


<h2 id="C