增加dispose的用例

example/lib/main.dart

@@ -23,6 +23,7 @@ class _MyAppState extends State<MyApp> {
 
     FlutterBoost.singleton.registerPageBuilders({
       'first': (pageName, params, _) => FirstRouteWidget(),
+      'firstFirst': (pageName, params, _) => FirstFirstRouteWidget(),
       'second': (pageName, params, _) => SecondRouteWidget(),
       'tab': (pageName, params, _) => TabRouteWidget(),
       'flutterFragment': (pageName, params, _) => FragmentRouteWidget(params),

example/lib/simple_page_widgets.dart

 import 'package:flutter/material.dart';
 import 'package:flutter_boost2/flutter_boost.dart';
 
-class FirstRouteWidget extends StatelessWidget {
+class FirstRouteWidget extends StatefulWidget {
+  @override
+  State<StatefulWidget> createState() {
+    return new _FirstRouteWidgetState();
+  }
+}
+
+class _FirstRouteWidgetState extends State<FirstRouteWidget> with WidgetsBindingObserver{
+  _FirstRouteWidgetState();
+
+  @override
+  void initState() {
+    print('initState');
+    super.initState();
+    WidgetsBinding.instance.addObserver(this);
+  }
+
+  @override
+  void didChangeDependencies() {
+    print('didChangeDependencies');
+    super.didChangeDependencies();
+  }
+
+  @override
+  void didUpdateWidget(FirstRouteWidget oldWidget) {
+    print('didUpdateWidget');
+    super.didUpdateWidget(oldWidget);
+  }
+
+  @override
+  void deactivate() {
+    print('deactivate');
+    super.deactivate();
+  }
+
+  @override
+  void dispose() {
+    print('[XDEBUG] - FirstRouteWidget is disposing~');
+    WidgetsBinding.instance.removeObserver(this);
+    super.dispose();
+  }
+
+  @override
+  void didChangeAppLifecycleState(AppLifecycleState state) {
+    switch (state) {
+      case AppLifecycleState.inactive:
+        print('AppLifecycleState.inactive');
+        break;
+      case AppLifecycleState.paused:
+        print('AppLifecycleState.paused');
+        break;
+      case AppLifecycleState.resumed:
+        print('AppLifecycleState.resumed');
+        break;
+      case AppLifecycleState.suspending:
+        print('AppLifecycleState.suspending');
+        break;
+    }
+
+    super.didChangeAppLifecycleState(state);
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text('First Route'),
+      ),
+      body: Center(
+        child:
+        Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: 
+          <Widget>[
+            RaisedButton(
+                child: Text('Open second route'),
+                onPressed: () {
+                  print("open second page!");
+                  FlutterBoost.singleton.open("second").then((Map value) {
+                    print(
+                        "call me when page is finished. did recieve second route result $value");
+                  });
+                },
+              ),
+            RaisedButton(
+                child: Text('Open FF route'),
+                onPressed: () {
+                  print("open FF page!");
+                  FlutterBoost.singleton.open("firstFirst").then((Map value) {
+                    print(
+                        "call me when page is finished. did recieve FF route result $value");
+                  });
+                },
+              ),
+              RaisedButton(
+                  child: Text('Present second route'),
+                  onPressed: () {
+                    print("Present second page!");
+                    FlutterBoost.singleton.open("second",urlParams:<String,dynamic>{"present":true}).then((Map value) {
+                      print(
+                          "call me when page is finished. did recieve second route result $value");
+                    });
+                  },
+                ),
+            ],
+        ),
+      ),
+    );
+  }
+}
+
+class FirstFirstRouteWidget extends StatefulWidget {
+  @override
+  State<StatefulWidget> createState() {
+    return new _FirstFirstRouteWidgetState();
+  }
+}
+
+class _FirstFirstRouteWidgetState extends State<FirstFirstRouteWidget>{
+  _FirstFirstRouteWidgetState();
+
+  @override
+  void initState() {
+    print('initState');
+    super.initState();
+  }
+
+  @override
+  void didChangeDependencies() {
+    print('didChangeDependencies');
+    super.didChangeDependencies();
+  }
+
+  @override
+  void didUpdateWidget(FirstFirstRouteWidget oldWidget) {
+    print('didUpdateWidget');
+    super.didUpdateWidget(oldWidget);
+  }
+
+  @override
+  void deactivate() {
+    print('deactivate');
+    super.deactivate();
+  }
+
+  @override
+  void dispose() {
+    print('[XDEBUG] - FirstFirstRouteWidget is disposing~');
+    super.dispose();
+  }
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
@@ -10,13 +160,13 @@ class FirstRouteWidget extends StatelessWidget {
       ),
       body: Center(
         child: RaisedButton(
-          child: Text('Open second route'),
+          child: Text('Open first route'),
           onPressed: () {
 
-            print("open second page!");
-            FlutterBoost.singleton.open("second").then((Map value){
-              print("did recieve second route result");
-              print("did recieve second route result $value");
+            print("open first page again!");
+            FlutterBoost.singleton.open("first").then((Map value){
+              print("did recieve first route result");
+              print("did recieve first route result $value");
             });
 
           },