Added a DialogFragment for the list of Realms

Author: kunall17

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

@@ -0,0 +1,50 @@
+package com.zulip.android;
+import android.app.AlertDialog;
+import android.app.Dialog;
+import android.app.ProgressDialog;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.content.Intent;
+import android.os.Bundle;
+import android.support.annotation.NonNull;
+import android.support.v4.app.DialogFragment;
+import android.util.Log;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.widget.AdapterView;
+import android.widget.ArrayAdapter;
+import android.widget.ListView;
+import android.widget.Toast;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+public class RealmDialog extends DialogFragment {
+    ZulipApp app;
+    ListView listView;
+    ArrayAdapter<String> realmsAdapter;
+    Context context;
+    public static RealmDialog newInstance() {
+        RealmDialog d = new RealmDialog();
+        return d;
+    }
+    public RealmDialog() {
+    }
+    List<String> realmsList;
+    @NonNull
+    @Override
+    public Dialog onCreateDialog(Bundle savedInstanceState) {
+        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
+        LayoutInflater inflater = getActivity().getLayoutInflater();
+        builder.setTitle(R.string.realm_title);
+        View rootView = inflater.inflate(R.layout.realm_dialog_list, null);
+        realmsList = new ArrayList<>();
+        context = getActivity();
+        app = ZulipApp.get();
+        listView = (ListView) rootView.findViewById(R.id.realmListView);
+        realmsList = new ArrayList<String>(app.serverStringSet);
+        realmsAdapter = new ArrayAdapter<String>(context, android.R.layout.simple_list_item_1, realmsList);
+        listView.setAdapter(realmsAdapter);
+        return builder.create();
+    }
+}

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

@@ -527,6 +527,11 @@ public void onClick(
                 }
                 openCompose(MessageType.PRIVATE_MESSAGE, null, null, recipient);
                 break;
+            case R.id.menu_realm:
+                FragmentManager fm = getSupportFragmentManager();
+                RealmDialog dialogFragment = RealmDialog.newInstance();
+                dialogFragment.show(fm, "fragment_realm");
+                break;
             case R.id.refresh:
                 Log.w("menu", "Refreshed manually by user. We shouldn't need this.");
                 onRefresh();

app/src/main/res/layout/realm_dialog_list.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ListView xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:id="@+id/realmListView"
+    android:layout_height="match_parent"
+    android:padding="16dp"
+    tools:context=".RealmDialog">
+</ListView>