update local session id and stop polling if local session id has changed

src/org/thoughtcrime/securesms/ApplicationContext.java

@@ -484,9 +484,12 @@ public class ApplicationContext extends MultiDexApplication implements Dependenc
   }
 
   private void setUpPollingIfNeeded() {
-    if (lokiPoller != null) return;
     String userPublicKey = TextSecurePreferences.getLocalNumber(this);
     if (userPublicKey == null) return;
+    if (lokiPoller != null) {
+      lokiPoller.updateUserHexEncodedPublicKey(userPublicKey);
+      return;
+    }
     LokiAPIDatabase apiDB = DatabaseFactory.getLokiAPIDatabase(this);
     Context context = this;
     LokiSwarmAPI.Companion.configureIfNeeded(apiDB);
@@ -504,6 +507,10 @@ public class ApplicationContext extends MultiDexApplication implements Dependenc
     if (lokiPoller != null) { lokiPoller.startIfNeeded(); }
   }
 
+  public void stopPollingIfNeeded() {
+    if (lokiPoller != null) { lokiPoller.stopIfNeeded(); }
+  }
+
   private void resubmitProfilePictureIfNeeded() {
     String userPublicKey = TextSecurePreferences.getLocalNumber(this);
     if (userPublicKey == null) return;

src/org/thoughtcrime/securesms/loki/activities/LandingActivity.kt

@@ -145,5 +145,7 @@ class LandingActivity : BaseActionBarActivity(), LinkDeviceSlaveModeDialogDelega
         TextSecurePreferences.removeLocalNumber(this)
         TextSecurePreferences.setHasSeenWelcomeScreen(this, false)
         TextSecurePreferences.setPromptedPushRegistration(this, false)
+        val application = ApplicationContext.getInstance(this)
+        application.stopPollingIfNeeded()
     }
 }