Switch realm method in ZulipActivity

Abort current connections, handlers and establish new ones.
Changed Database name while connecting.

Author: kunall17

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

@@ -8,7 +8,9 @@
 
 import android.annotation.SuppressLint;
 import android.annotation.TargetApi;
+import android.app.Activity;
 import android.app.AlertDialog;
+import android.app.ProgressDialog;
 import android.app.SearchManager;
 import android.content.BroadcastReceiver;
 import android.content.Context;
@@ -51,6 +53,29 @@ public class ZulipActivity extends FragmentActivity implements
 
     ZulipApp app;
 
+    public void switchRealm(final ProgressDialog progressDialog, final int position) {
+        if (event_poll != null) {
+            event_poll.abort();
+            event_poll = null;
+        }
+        statusUpdateHandler.removeMessages(0);
+        unregisterReceiver(onGcmMessage);
+        app.clearConnectionState();
+        notifications.logOut(new Runnable() {
+            @Override
+            public void run() {
+                app.switchToRealm(position);
+                app.resetDatabase();
+                app.setEmail(app.you.getEmail());
+                event_poll = new AsyncGetEvents(ZulipActivity.this);
+                event_poll.start();
+                IntentFilter filter = new IntentFilter(GcmBroadcastReceiver.BROADCAST);
+                filter.setPriority(2);
+                registerReceiver(onGcmMessage, filter);
+                progressDialog.dismiss();
+            }
+        });
+    }
     // Intent Extra constants
     public enum Flag {
         RESET_DATABASE,

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

@@ -166,7 +166,7 @@ public String getUserAgent() {
     }
 
     public void setEmail(String email) {
-        databaseHelper = new DatabaseHelper(this, email);
+        databaseHelper = new DatabaseHelper(this, SERVER_SETTINGS + currentRealm);
         this.you = Person.getOrUpdate(this, email, null, null);
     }