Generando Navegación en BottomNavigationBar

platzi_trips_app/lib/main.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'platzi_trips.dart';
 
 void main() => runApp(MyApp());
 
@@ -21,7 +22,7 @@ class MyApp extends StatelessWidget {
         // is not restarted.
         primarySwatch: Colors.blue,
       ),
-      home:
+      home: PlatziTrips()
     );
   }
 }

platzi_trips_app/lib/platzi_trips.dart

@@ -1,25 +1,48 @@
 import 'package:flutter/material.dart';
+import 'home_trips.dart';
+import 'search_trips.dart';
+import 'profile_trips.dart';
 
 class PlatziTrips extends StatefulWidget {
   @override
   State<StatefulWidget> createState() {
     // TODO: implement createState
-    return null;
+    return _PlatziTrips();
   }
 
 }
 
 class _PlatziTrips extends State<PlatziTrips> {
+  int indexTap = 0;
+  final List<Widget> widgetsChildren = [
+    HomeTrips(),
+    SearchTrips(),
+    ProfileTrips()
+  ];
+
+  void onTapTapped(int index){
+
+    setState(() {
+      indexTap = index;
+    });
+
+  }
+
   @override
   Widget build(BuildContext context) {
     // TODO: implement build
+
+
     return  Scaffold(
+      body: widgetsChildren[indexTap],
       bottomNavigationBar: Theme(
         data: Theme.of(context).copyWith(
           canvasColor: Colors.white,
           primaryColor: Colors.purple
         ),
         child: BottomNavigationBar(
+          onTap: onTapTapped,
+          currentIndex: indexTap,
             items: [
               BottomNavigationBarItem(
                 icon: Icon(Icons.home),

platzi_trips_app/lib/profile_trips.dart

@@ -0,0 +1,12 @@
+import 'package:flutter/material.dart';
+
+class ProfileTrips extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    // TODO: implement build
+    return Container(
+      color: Colors.indigo,
+    );
+  }
+
+}

platzi_trips_app/lib/search_trips.dart

@@ -0,0 +1,12 @@
+import 'package:flutter/material.dart';
+
+class SearchTrips extends StatelessWidget{
+  @override
+  Widget build(BuildContext context) {
+    // TODO: implement build
+    return Container(
+      color: Colors.greenAccent,
+    );
+  }
+
+}