updated: implemented using_snackbar example

using_snackbar/lib/main.dart

@@ -12,8 +12,37 @@ class ContactPage extends StatelessWidget {
         title: new Text("Using SnackBar"),
       ),
       body: new Center(
-        child: new Text("Hello World!"),
+        child: new MyButton(),
       ),
     );
   }
 }
+
+class MyButton extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return new RaisedButton(
+      child: new Text('Show SnackBar'),
+      // On pressing the raised button
+      onPressed: () {
+        // show snackbar
+        Scaffold.of(context).showSnackBar(new SnackBar(
+              // set content of snackbar
+              content: new Text("Hello! I am SnackBar :)"),
+              // set duration
+              duration: new Duration(seconds: 3),
+              // set the action
+              action: new SnackBarAction(
+                  label: "Hit Me (Action)",
+                  onPressed: () {
+                    // When action button is pressed, show another snackbar
+                    Scaffold.of(context).showSnackBar(new SnackBar(
+                          content: new Text(
+                              "Hello! I am shown becoz you pressed Action :)"),
+                        ));
+                  }),
+            ));
+      },
+    );
+  }
+}