import com.owncloud.android.R;
 import com.owncloud.android.authentication.AccountUtils;
 import com.owncloud.android.authentication.AuthenticatorActivity;
+import com.owncloud.android.authentication.PinCheck;
 import com.owncloud.android.datamodel.FileDataStorageManager;
 import com.owncloud.android.datamodel.OCFile;
 import com.owncloud.android.db.DbHandler;
 import com.owncloud.android.ui.RadioButtonPreference;
 import com.owncloud.android.utils.DisplayUtils;
 
-import java.io.File;
-
 
 /**
  * An Activity that allows the user to change the application's settings.
     @Override
     protected void onPause() {
         super.onPause();
+        
+        PinCheck.setUnlockTimestamp();
     }
 
     @Override
                                             FileDisplayActivity.class
                                     );
                                     i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
+                                    i.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
                                     startActivity(i);
                                 } else {
                                     finish();