Update GridView to use a builder

example/lib/main.dart

@@ -33,18 +33,24 @@ class FontAwesomeGalleryHomeState extends State<FontAwesomeGalleryHome> {
 
   @override
   Widget build(BuildContext context) {
-    return new Scaffold(
-      appBar: _isSearching ? _searchBar(context) : _titleBar(),
-      body: new GridView.count(
-          crossAxisCount:
-              MediaQuery.of(context).orientation == Orientation.portrait
-                  ? 2
-                  : 3,
-          children: icons
+    final filteredIcons = icons
         .where((icon) =>
             _searchTerm.isEmpty ||
             icon.title.toLowerCase().startsWith(_searchTerm.toLowerCase()))
-              .map((icon) => new InkWell(
+        .toList();
+    final orientation = MediaQuery.of(context).orientation;
+
+    return new Scaffold(
+      appBar: _isSearching ? _searchBar(context) : _titleBar(),
+      body: new GridView.builder(
+          itemCount: filteredIcons.length,
+          gridDelegate: new SliverGridDelegateWithFixedCrossAxisCount(
+            crossAxisCount: orientation == Orientation.portrait ? 2 : 3,
+          ),
+          itemBuilder: (context, index) {
+            final icon = filteredIcons[index];
+
+            return new InkWell(
               onTap: () {
                 Navigator.push(
                   context,
@@ -75,8 +81,8 @@ class FontAwesomeGalleryHomeState extends State<FontAwesomeGalleryHome> {
                       child: new Text(icon.title))
                 ],
               ),
-                  ))
-              .toList()),
+            );
+          }),
     );
   }