🚧 remove new keyword to get inline with dart 2 code standard.

dropdown_button/lib/main.dart

@@ -1,11 +1,11 @@
 import 'package:flutter/material.dart';
 
-void main() => runApp(new MyApp());
+void main() => runApp(MyApp());
 
 class MyApp extends StatefulWidget {
   @override
   State<StatefulWidget> createState() {
-    return new MyAppState();
+    return MyAppState();
   }
 }
 
@@ -23,9 +23,9 @@ class MyAppState extends State<MyApp> {
   }
 
   List<DropdownMenuItem<String>> buildAndGetDropDownMenuItems(List fruits) {
-    List<DropdownMenuItem<String>> items = new List();
+    List<DropdownMenuItem<String>> items = List();
     for (String fruit in fruits) {
-      items.add(new DropdownMenuItem(value: fruit, child: new Text(fruit)));
+      items.add(DropdownMenuItem(value: fruit, child: Text(fruit)));
     }
     return items;
   }
@@ -38,20 +38,20 @@ class MyAppState extends State<MyApp> {
 
   @override
   Widget build(BuildContext context) {
-    return new MaterialApp(
+    return MaterialApp(
       debugShowCheckedModeBanner: false,
-      home: new Scaffold(
-        appBar: new AppBar(
-          title: new Text("DropDown Button Example"),
+      home: Scaffold(
+        appBar: AppBar(
+          title: Text("DropDown Button Example"),
         ),
-        body: new Container(
-          child: new Center(
-              child: new Column(
+        body: Container(
+          child: Center(
+              child: Column(
             crossAxisAlignment: CrossAxisAlignment.center,
             mainAxisAlignment: MainAxisAlignment.center,
             children: <Widget>[
-              new Text("Please choose a fruit: "),
-              new DropdownButton(
+              Text("Please choose a fruit: "),
+              DropdownButton(
                 value: _selectedFruit,
                 items: _dropDownMenuItems,
                 onChanged: changedDropDownItem,

enabling_splash_screen/lib/main.dart

@@ -1,19 +1,19 @@
 import 'package:flutter/material.dart';
 
-void main() => runApp(new MyApp());
+void main() => runApp(MyApp());
 
 class MyApp extends StatelessWidget {
   // This widget is the root of your application.
   @override
   Widget build(BuildContext context) {
-    return new MaterialApp(
+    return MaterialApp(
       title: 'Flutter Demo',
-      home: new Scaffold(
-        appBar: new AppBar(
-          title: new Text("Splash Screen Example"),
+      home: Scaffold(
+        appBar: AppBar(
+          title: Text("Splash Screen Example"),
         ),
-        body: new Center(
-          child: new Text("Hello World"),
+        body: Center(
+          child: Text("Hello World"),
         ),
       ),
     );

google_signin/lib/home.dart

@@ -16,22 +16,22 @@ class Home extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return new Scaffold(
-      appBar: new AppBar(title: new Text("Sign In")),
-      body: new Container(
+    return Scaffold(
+      appBar: AppBar(title: Text("Sign In")),
+      body: Container(
           padding: const EdgeInsets.all(20.0),
-          child: new Center(
-            child: new Column(
+          child: Center(
+            child: Column(
               mainAxisAlignment: MainAxisAlignment.center,
               children: <Widget>[
                 showLoading
-                    ? new CircularProgressIndicator()
-                    : new RaisedButton(
+                    ? CircularProgressIndicator()
+                    : RaisedButton(
                         onPressed: this.onSignin,
-                        child: new Text("Sign In"),
+                        child: Text("Sign In"),
                         color: Colors.lightBlueAccent,
                       ),
-                //new RaisedButton(onPressed: this.onLogout, child: new Text("Logout"), color: Colors.amberAccent),
+                //RaisedButton(onPressed: this.onLogout, child: Text("Logout"), color: Colors.amberAccent),
               ],
             ),
           )),

google_signin/lib/main.dart

@@ -8,11 +8,11 @@ import 'home.dart';
 import 'user.dart';
 
 void main() {
-  runApp(new App());
+  runApp(App());
 }
 
 class App extends StatefulWidget {
-  AppState createState() => new AppState();
+  AppState createState() => AppState();
 }
 
 class AppState extends State<App> {
@@ -24,7 +24,7 @@ class AppState extends State<App> {
   @override
   void initState() {
     super.initState();
-    userPage = new Home(
+    userPage = Home(
       onSignin: () {
         _signin();
         print("Sign");
@@ -36,11 +36,11 @@ class AppState extends State<App> {
 
   Future<FirebaseUser> _signin() async {
     setState(() {
-      userPage = new Home(onSignin: null, onLogout: _logout, showLoading: true);
+      userPage = Home(onSignin: null, onLogout: _logout, showLoading: true);
     });
     FirebaseAuth _auth = FirebaseAuth.instance;
     try {
-      googleSignIn = new GoogleSignIn();
+      googleSignIn = GoogleSignIn();
       GoogleSignInAccount googleSignInAccount = await googleSignIn.signIn();
       GoogleSignInAuthentication gauth =
           await googleSignInAccount.authentication;
@@ -51,7 +51,7 @@ class AppState extends State<App> {
 
       setState(() {
         _username = user.displayName;
-        userPage = new User(
+        userPage = User(
           onLogout: _logout,
           user: user,
         );
@@ -67,7 +67,7 @@ class AppState extends State<App> {
   void _logout() async {
     await googleSignIn.signOut();
     setState(() {
-      userPage = new Home(
+      userPage = Home(
         onSignin: () {
           _signin();
           print("Sign");
@@ -82,7 +82,7 @@ class AppState extends State<App> {
 
   @override
   Widget build(BuildContext context) {
-    return new MaterialApp(
+    return MaterialApp(
       home: userPage,
     );
   }

google_signin/lib/user.dart

@@ -13,22 +13,22 @@ class User extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return new Scaffold(
-      appBar: new AppBar(
-        title: new Text("Welcome"),
+    return Scaffold(
+      appBar: AppBar(
+        title: Text("Welcome"),
         actions: <Widget>[
-          new IconButton(
-              icon: new Icon(Icons.exit_to_app), onPressed: this.onLogout)
+          IconButton(
+              icon: Icon(Icons.exit_to_app), onPressed: this.onLogout)
         ],
       ),
-      body: new Container(
+      body: Container(
           padding: const EdgeInsets.all(20.0),
-          child: new Center(
-              child: new Column(
+          child: Center(
+              child: Column(
             mainAxisAlignment: MainAxisAlignment.center,
             children: <Widget>[
-              new Image.network(user.photoUrl),
-              new Text(
+              Image.network(user.photoUrl),
+              Text(
                 user.displayName,
                 textScaleFactor: 1.5,
               ),

grid_layout/lib/gridview.dart

@@ -2,23 +2,23 @@ import 'package:flutter/material.dart';
 
 class MyGridView {
   Card getStructuredGridCell(name, image) {
-    return new Card(
+    return Card(
         elevation: 1.5,
-        child: new Column(
+        child: Column(
           crossAxisAlignment: CrossAxisAlignment.stretch,
           mainAxisSize: MainAxisSize.min,
           verticalDirection: VerticalDirection.down,
           children: <Widget>[
-            new Image(image: new AssetImage('data_repo/img/' + image)),
-            new Center(
-              child: new Text(name),
+            Image(image: AssetImage('data_repo/img/' + image)),
+            Center(
+              child: Text(name),
             )
           ],
         ));
   }
 
   GridView build() {
-    return new GridView.count(
+    return GridView.count(
       primary: true,
       padding: const EdgeInsets.all(1.0),
       crossAxisCount: 2,

grid_layout/lib/main.dart

@@ -1,20 +1,20 @@
 import 'package:flutter/material.dart';
 import 'package:grid_layout/gridview.dart';
 
-void main() => runApp(new MyApp());
+void main() => runApp(MyApp());
 
 class MyApp extends StatelessWidget {
-  final MyGridView myGridView = new MyGridView();
+  final MyGridView myGridView = MyGridView();
 
   @override
   Widget build(BuildContext context) {
-    return new MaterialApp(
+    return MaterialApp(
       debugShowCheckedModeBanner: false,
-      home: new Scaffold(
-        appBar: new AppBar(
+      home: Scaffold(
+        appBar: AppBar(
           // Here we take the value from the MyHomePage object that was created by
           // the App.build method, and use it to set our appbar title.
-          title: new Text("GridView Example"),
+          title: Text("GridView Example"),
         ),
         body: myGridView.build(),
       ),

handling_routes/lib/main.dart

@@ -3,12 +3,12 @@ import 'package:handling_routes/screens/about.dart';
 import 'package:handling_routes/screens/home.dart';
 
 void main() {
-  runApp(new MaterialApp(
-    home: new HomePage(), // home has implicit route set at '/'
+  runApp(MaterialApp(
+    home: HomePage(), // home has implicit route set at '/'
     // Setup routes
     routes: <String, WidgetBuilder>{
       // Set named routes
-      AboutPage.routeName: (BuildContext context) => new AboutPage(),
+      AboutPage.routeName: (BuildContext context) => AboutPage(),
     },
   ));
 }

handling_routes/lib/screens/about.dart

@@ -5,34 +5,34 @@ class AboutPage extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return new Scaffold(
+    return Scaffold(
       // AppBar
-      appBar: new AppBar(
+      appBar: AppBar(
         // Title
-        title: new Text("About Page"),
+        title: Text("About Page"),
         // App Bar background color
         backgroundColor: Colors.blue,
       ),
       // Body
-      body: new Container(
+      body: Container(
         // Center the content
-        child: new Center(
-          child: new Column(
+        child: Center(
+          child: Column(
             // Center content in the column
             mainAxisAlignment: MainAxisAlignment.center,
             // add children to the column
             children: <Widget>[
               // Text
-              new Text(
+              Text(
                 "About Page\nClick on below icon to goto Home Page",
                 // Setting the style for the Text
-                style: new TextStyle(fontSize: 20.0),
+                style: TextStyle(fontSize: 20.0),
                 // Set text alignment to center
                 textAlign: TextAlign.center,
               ),
               // Icon Button
-              new IconButton(
-                icon: new Icon(
+              IconButton(
+                icon: Icon(
                   Icons.home,
                   color: Colors.red,
                 ),

handling_routes/lib/screens/home.dart

@@ -3,34 +3,34 @@ import 'package:flutter/material.dart';
 class HomePage extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
-    return new Scaffold(
+    return Scaffold(
       // AppBar
-      appBar: new AppBar(
+      appBar: AppBar(
         // Title
-        title: new Text("Home Page"),
+        title: Text("Home Page"),
         // App Bar background color
         backgroundColor: Colors.red,
       ),
       // Body
-      body: new Container(
+      body: Container(
         // Center the content
-        child: new Center(
-          child: new Column(
+        child: Center(
+          child: Column(
             // Center content in the column
             mainAxisAlignment: MainAxisAlignment.center,
             // add children to the column
             children: <Widget>[
               // Text
-              new Text(
+              Text(
                 "Home Page\nClick on below icon to goto About Page",
                 // Setting the style for the Text
-                style: new TextStyle(fontSize: 20.0,),
+                style: TextStyle(fontSize: 20.0,),
                 // Set text alignment to center
                 textAlign: TextAlign.center,
               ),
               // Icon Button
-              new IconButton(
-                icon: new Icon(
+              IconButton(
+                icon: Icon(
                   Icons.info,
                   color: Colors.blue,
                 ),