Method to switch the current realm

Saves current server position, changes the databaseHelper and get's the
saved data for this server

Author: kunall17

app/src/main/java/com/zulip/android/ZulipApp.java

@@ -100,7 +100,7 @@ public void onCreate() {
         currentRealm = globalSettings.getInt(GLOBAL_SETTINGS_CURRENT, currentRealm);
         serverStringSet = new HashSet<String>(globalSettings.getStringSet(GLOBAL_SETTINGS_REALMS, new HashSet<String>()));
 
-
+        switchToRealm(currentRealm);
         if (BuildHelper.shouldLogToCrashlytics()) {
             // TODO(lfaraone): figure out what to do about crash reporting
         }
@@ -387,4 +387,22 @@ public void createNewRealm() {
         lastEventId = settings.getInt("lastEventId", -1);
         pointer = settings.getInt("pointer", -1);
     }
+
+    public void switchToRealm(int position) {
+        databaseHelper = new DatabaseHelper(this, SERVER_SETTINGS + position);
+        this.settings = getSharedPreferences(SERVER_SETTINGS + position, Context.MODE_PRIVATE);
+        this.api_key = settings.getString("api_key", null);
+        max_message_id = settings.getInt("max_message_id", -1);
+        eventQueueId = settings.getString("eventQueueId", null);
+        lastEventId = settings.getInt("lastEventId", -1);
+        pointer = settings.getInt("pointer", -1);
+        if (settings.contains("email"))
+            this.you = Person.getOrUpdate(this, settings.getString("email", null), null, null);
+        currentRealm = position;
+        if (position != currentRealm) {
+            SharedPreferences.Editor edit = globalSettings.edit();
+            edit.putInt(GLOBAL_SETTINGS_CURRENT, position);
+            edit.apply();
+        }
+    }
 }