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POWhat to do if facebook session / token is invalid in my application?
 

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  1. POWhat to do if facebook session / token is invalid in my application?
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    <p>I'm a beginner with the Facebook SDK (3.0.1) for Android and I'm wondering a lot of questions that I was not able to find on the official documentation.</p> <p>In the facebook example, to ask for new permissions, they are using the UILifeCyclerHelper in the same activity than the login activity. My case is a little bit different.</p> <p>In my case, I log in the user in a first activity, and then, more later, I'm asking for permissions to publish on its wall.</p> <p>1) I'm wondering about what to do when the session is null, closed, or in an other state that don't allow me to ask these permissions.</p> <p>2) Because the publishing on the wall is do later by my server, I need to send the user access token. Here again, what can I do if this token is null / invalid ?</p> <p>3) I'm currently asking permissions like bellow. What can I do to have a callback of the user's answer ? Is this happenned onActivityResult ? What kind of answers are returned ?</p> <p>Per advance, thanks for your help !</p> <pre><code>Session session = Session.getActiveSession(); if (session != null){ // Check for publish permissions List&lt;String&gt; permissions = session.getPermissions(); if (!isSubsetOf(PERMISSIONS, permissions)) { Session.NewPermissionsRequest newPermissionsRequest = new Session.NewPermissionsRequest(this, PERMISSIONS); session.requestNewPublishPermissions(newPermissionsRequest); } else{ launchPublishWallTask(); } private static final List&lt;String&gt; PERMISSIONS = Arrays.asList("publish_stream"); private boolean isSubsetOf(Collection&lt;String&gt; subset, Collection&lt;String&gt; superset) { for (String string : subset) { if (!superset.contains(string)) { return false; } } return true; } </code></pre> <hr> <p>EDIT (to answer to Ming Li's answer) :</p> <p>Thanks for your answer... but there is some points that I don't understand again.</p> <p>1) If my session is null, do you say to simply do that ?</p> <pre><code>if (session == null){ session = new Session(this.getSherlockActivity()); Session.setActiveSession(session); } </code></pre> <p>By doing that, the user will have to login again, no ? Permissions will disappear from this new Session object, even if user has accepted it before, isn't it ?</p> <p>2) I have read that the user access token is only valid during 2 houres, and is invalidated in some case, like the user reset password for example. So, by recreating the session object (question 1 above), even if I have the session object AND permissions, is it sure that I will have a valid user access token too ?</p> <p>3) OK, thanks</p> <p>To resume my question, is it a good way to do "only" that in my case (I have not copy here the onActivityResult method, but it's ok for that):</p> <pre><code>public void onClick(View v){ // Retrieve Facebook session object Session session = Session.getActiveSession(); if (session == null){ session = new Session(this.getSherlockActivity()); Session.setActiveSession(session); } session.addCallback(this); if (session != null){ // Check for publish permissions List&lt;String&gt; permissions = session.getPermissions(); if (!isSubsetOf(PERMISSIONS, permissions)) { Session.NewPermissionsRequest newPermissionsRequest = new Session.NewPermissionsRequest( this, PERMISSIONS ); session.requestNewPublishPermissions(newPermissionsRequest); } else{ launchPublishWallTask(); } } } @Override public void call(Session session, SessionState state, Exception exception) { if (session != null &amp;&amp; isSubsetOf(PERMISSIONS, session.getPermissions())){ launchPublishWallTask(); } else{ Toast.makeText(getSherlockActivity(), "you have to accept !", Toast.LENGTH_LONG).show(); } } private void launchPublishWallTask(){ // Here, I'm sure that I will have a valid Session.getActiveSession().getAccessToken() .. or not ? } </code></pre>
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