title: android-fb-sdk email is always null
body: <p>I have a big problem with android-facebook-sdk 3.19.1. No problem to retrieve public information about user but it is not possible getting email address.</p>
  
  <p>I know my post is very near to the following thread ==> <a href="https://stackoverflow.com/questions/19797770/facebook-android-sdk-user-email-returns-null">facebook android sdk -user email returns null</a> but I have no solution for now.</p>
  
  <p>So here is my code</p>
  
  <p>In my ConnectionActivity.java I have a button R.id.fb_connect</p>
  
  <pre><code>private List&lt;String&gt; permissions = Arrays.asList("email");
  
  @Click(R.id.fb_connect)
  protected void fbConnect() {
      ensureOpenSession();
  }
  
  private boolean ensureOpenSession() {
      Session session = Session.getActiveSession();
      if (session == null || !session.isOpened()) {
          LOGD(TAG, "Call Session.openActiveSession");
          Session.openActiveSession(this, true, permissions, new FbCallback());
          return false;
      }
      return true;
  }
  
  public class FbCallback implements Session.StatusCallback {
  
      @Override
      public void call(Session session, SessionState sessionState, Exception e) {
          // make request to the /me API
          Request.newMeRequest(session, new Request.GraphUserCallback() {
              // callback after Graph API response with user object
              @Override
              public void onCompleted(GraphUser user, Response response) {
                  if (user != null) {
                      // user.asMap().get("email");
                      Toast.makeText(ConnectionActivity.this, "email : " + user.getProperty("email"), Toast.LENGTH_LONG).show();
                  }
              }
          }).executeAsync();
      }
  }
  </code></pre>
  
  <p>I've also tried the code in the link above but it doesn't work. One precision, with this code, I can see the facebook activity which says "XXX will receive the following info: your public profile and email address" but the toast displays "email : null"</p>
  
  <hr>
  
  <p>EDIT</p>
  
  <p>I work with android studio and my gradle file has the following line</p>
  
  <pre><code>compile 'com.facebook.android:facebook-android-sdk:3.19.1'
  </code></pre>
  
  <hr>
  
  <p>EDIT2</p>
  
  <p>If I use</p>
  
  <pre><code>LOGD(TAG, "isPermissionGranted : " + session.isPermissionGranted(permissions.get(0)));
  </code></pre>
  
  <p>before call <code>Request.newMeRequest</code> so true is shown. Permission is correctly granted</p>
  
  <p>Thx</p>