Update picked asset for list.

example/lib/icon_text_button.dart

+import 'package:flutter/material.dart';
+
+class IconTextButton extends StatelessWidget {
+  final IconData icon;
+  final String text;
+  final Function onTap;
+
+  const IconTextButton({Key key, this.icon, this.text, this.onTap})
+      : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return InkWell(
+      onTap: onTap,
+      child: Container(
+        child: ListTile(
+          leading: Icon(icon ?? Icons.device_unknown),
+          title: Text(text ?? ""),
+        ),
+      ),
+    );
+  }
+}

example/lib/main.dart

 import 'package:photo_manager/photo_manager.dart';
 
 import './preview.dart';
+import 'icon_text_button.dart';
+import 'picked_example.dart';
 
 void main() => runApp(MyApp());
 
       child: MaterialApp(
         title: 'Pick Image Demo',
         theme: ThemeData(
-          primarySwatch: Colors.blue,
+          primarySwatch: Colors.lime,
         ),
         home: MyHomePage(title: 'Pick Image Demo'),
       ),
           child: Column(
             children: <Widget>[
               IconTextButton(
-                  icon: Icons.photo,
-                  text: "photo",
-                  onTap: () => _pickAsset(PickType.onlyImage)),
+                icon: Icons.photo,
+                text: "photo",
+                onTap: () => _pickAsset(PickType.onlyImage),
+              ),
+              IconTextButton(
+                icon: Icons.videocam,
+                text: "video",
+                onTap: () => _pickAsset(PickType.onlyVideo),
+              ),
               IconTextButton(
-                  icon: Icons.videocam,
-                  text: "video",
-                  onTap: () => _pickAsset(PickType.onlyVideo)),
+                icon: Icons.album,
+                text: "all",
+                onTap: () => _pickAsset(PickType.all),
+              ),
               IconTextButton(
-                  icon: Icons.album,
-                  text: "all",
-                  onTap: () => _pickAsset(PickType.all)),
-              Text(
-                '$currentSelected',
-                textAlign: TextAlign.center,
+                icon: CupertinoIcons.reply_all,
+                text: "Picked asset example.",
+                onTap: () => routePage(PickedExample()),
               ),
             ],
           ),
     }
     setState(() {});
   }
-}
-
-class IconTextButton extends StatelessWidget {
-  final IconData icon;
-  final String text;
-  final Function onTap;
 
-  const IconTextButton({Key key, this.icon, this.text, this.onTap})
-      : super(key: key);
-
-  @override
-  Widget build(BuildContext context) {
-    return InkWell(
-      onTap: onTap,
-      child: Container(
-        child: ListTile(
-          leading: Icon(icon ?? Icons.device_unknown),
-          title: Text(text ?? ""),
-        ),
+  void routePage(Widget widget) {
+    Navigator.push(
+      context,
+      MaterialPageRoute(
+        builder: (BuildContext context) {
+          return widget;
+        },
       ),
     );
   }

example/lib/picked_example.dart

+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+import 'package:photo/photo.dart';
+
+import 'icon_text_button.dart';
+import 'package:photo_manager/photo_manager.dart';
+
+class PickedExample extends StatefulWidget {
+  @override
+  _PickedExampleState createState() => _PickedExampleState();
+}
+
+class _PickedExampleState extends State<PickedExample> {
+  List<AssetEntity> picked = [];
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text("Cross Picked asset"),
+      ),
+      body: Column(
+        children: <Widget>[
+          IconTextButton(
+            icon: Icons.assignment,
+            text: "Pick asset",
+            onTap: _pickAsset,
+          ),
+          ListTile(
+            title: Text("picked asset count = ${picked.length}"),
+          ),
+        ],
+      ),
+    );
+  }
+
+  void _pickAsset() async {
+    final result = await PhotoPicker.pickAsset(
+      context: context,
+      pickedAssetList: picked,
+    );
+    if (result != null && result.isNotEmpty) {
+      picked.clear();
+      picked.addAll(result);
+      setState(() {});
+    }
+  }
+}

lib/src/provider/asset_provider.dart

   bool get noMore => getPaging()?.noMore ?? false;
 
   int get count => data?.length ?? 0;
-
-  void addPickedAssetList() {}
 }
 
 class AssetPaging {

lib/src/provider/config_provider.dart

   final Options options;
   final I18nProvider provider;
   final AssetProvider assetProvider = AssetProvider();
+  final List<AssetEntity> pickedAssetList;
   PhotoPickerProvider({
     @required this.options,
     @required this.provider,
     @required Widget child,
+    this.pickedAssetList,
     Key key,
   }) : super(key: key, child: child);
 
 
   static AssetProvider assetProviderOf(BuildContext context) =>
       of(context).assetProvider;
-
-  void addPickedAssetList(List<AssetEntity> pickedAssetList) {
-    assetProvider.addPickedAssetList();
-  }
 }

lib/src/provider/selected_provider.dart

       return notExistsList.contains(e);
     });
   }
+
+  addPickedAsset(List<AssetEntity> list) {
+    for (final entity in list) {
+      addSelectEntity(entity);
+    }
+  }
 }

lib/src/ui/page/photo_main_page.dart

   void didChangeDependencies() {
     super.didChangeDependencies();
     if (!_isInit) {
+      addPickedAsset(PhotoPickerProvider.of(context).pickedAssetList.toList());
       _refreshList();
     }
   }

lib/src/ui/photo_app.dart

     final pickerProvider = PhotoPickerProvider(
       provider: provider,
       options: options,
+      pickedAssetList: pickedAssetList,
       child: PhotoMainPage(
         onClose: (List<AssetEntity> value) {
           Navigator.pop(context, value);