update example

Author: MMMzq

example/android/gradle.properties

@@ -1 +1,2 @@
 org.gradle.jvmargs=-Xmx1536M
+android.enableR8=true

example/lib/main.dart

@@ -17,66 +17,20 @@ void main() {
   runApp(MyApp());
 }
 
-class MyApp extends StatefulWidget {
-  @override
-  _MyAppState createState() => _MyAppState();
-}
-
-class _MyAppState extends State<MyApp> {
-  UniqueKey key1 = UniqueKey();
-  UniqueKey key2 = UniqueKey();
-  GlobalKey<NavigatorState> navigatorKey = GlobalKey<NavigatorState>();
+class MyApp extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
-    return Container(
-      key: key1,
-      child: BotToastInit(
-        child: MaterialApp(
-          key: key2,
-          title: 'BotToast Demo',
-          navigatorKey: navigatorKey,
-          navigatorObservers: [BotToastNavigatorObserver()],
-          home: Column(
-            children: <Widget>[
-              RaisedButton(
-                onPressed: () async {
-                  setState(() {
-                    key1 = UniqueKey();
-                  });
-                },
-                child: Text('切换外层key'),
-              ),
-              RaisedButton(
-                onPressed: () async {
-                  setState(() {
-                    key2 = UniqueKey();
-                  });
-                },
-                child: Text('切换内层层key'),
-              ),
-              RaisedButton(
-                onPressed: () async {
-                  setState(() {
-                    navigatorKey = GlobalKey<NavigatorState>();
-                  });
-                },
-                child: Text('切换导航key'),
-              ),
-              Expanded(child: EnterPage()),
-            ],
-          ),
-        ),
+    return BotToastInit(
+      child: MaterialApp(
+        title: 'BotToast Demo',
+        navigatorObservers: [BotToastNavigatorObserver()],
+        home: EnterPage(),
       ),
     );
   }
 }
 
-class EnterPage extends StatefulWidget {
-  @override
-  _EnterPageState createState() => _EnterPageState();
-}
-
-class _EnterPageState extends State<EnterPage> {
+class EnterPage extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
@@ -88,33 +42,13 @@ class _EnterPageState extends State<EnterPage> {
           alignment: Alignment.topCenter,
           child: SingleChildScrollView(
             child: Container(
-              margin: EdgeInsets.only(top: 5),
+              margin: EdgeInsets.only(top: 30),
               child: Column(children: <Widget>[
                 Text(
                   "Notification",
                   style: TextStyle(fontWeight: FontWeight.w500, fontSize: 20),
                 ),
                 Divider(),
-                RaisedButton(
-                  onPressed: () async {
-                    final cancel = BotToast.showText(
-                        text: 'test', duration: null);
-//                  await Future.delayed(Duration(milliseconds: 500));
-//                  cancel();
-                  },
-                  child: Text('test'),
-                ),
-                RaisedButton(
-                  onPressed: () async {
-//                    NavigatorState n=Navigator.of(context);
-//                    n.popUntil((_)=>false);
-
-                    Navigator.of(context).pushAndRemoveUntil(
-                        MaterialPageRoute(builder: (_) => EnterPage()), (
-                        _) => false);
-                  },
-                  child: Text('弹出所有路由再push'),
-                ),
                 Row(
                   children: <Widget>[
                     Expanded(