1、增加方法assetImageExist(检查本地资源文件是否存在)；2、优化BaseListWidget(①增加状态-加载中、加载成功、加载失败②列表获取错误toast③设置空省图);

lib/utils/image_utils.dart

 
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:flutter/widgets.dart';
 
 class ImageUtils {
@@ -19,5 +20,14 @@ class ImageUtils {
   static String getSVGPath(String name, {String format = 'svg'}) {
     return 'assets/images/$name.$format';
   }
-}
 
+  static Future<bool> assetImageExist(String? name,
+      {String format = 'png'}) async {
+    try {
+      await rootBundle.load(getImgPath(name, format: format));
+      return true;
+    } catch (e) {
+      return false;
+    }
+  }
+}

lib/widget/base_list_widget.dart

-import 'package:easy_refresh/easy_refresh.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_clx_base/flutter_clx_base.dart';
+import 'package:flutter_clx_base/widget/state_layout.dart';
 import 'package:flutter_spinkit/flutter_spinkit.dart';
 
 export 'package:easy_refresh/easy_refresh.dart';
@@ -49,6 +49,9 @@ class _BaseListWidgetState extends State<BaseListWidget> {
   final List<dynamic> _dataList = [];
   int _page = 1;
   int _count = 0;
+  bool startLoadingFinish = false; // 首次进入loading加载完成标识
+  StateType stateType = StateType.loading; // 列表状态
+
   @override
   void initState() {
     super.initState();
@@ -72,6 +75,7 @@ class _BaseListWidgetState extends State<BaseListWidget> {
         builder: (ctx, state) {
           if (state.mode == IndicatorMode.inactive ||
               state.mode == IndicatorMode.done) {
+            startLoadingFinish = true;
             return const SizedBox();
           }
           return Container(
@@ -87,7 +91,7 @@ class _BaseListWidgetState extends State<BaseListWidget> {
         },
       ),
       onRefresh: _onRefresh,
-      onLoad: widget.noMoreLoad? null : _onLoad,
+      onLoad: widget.noMoreLoad ? null : _onLoad,
       child: buildScrollView(),
     );
   }
@@ -99,12 +103,14 @@ class _BaseListWidgetState extends State<BaseListWidget> {
   }
 
   Future<void> _onRefresh() async {
+    stateType = StateType.loading;
     _page = 1;
     await widget.requestData(
         _page, widget.pageSize, _requestSuccess, _requestError);
   }
 
   Future<void> _onLoad() async {
+    stateType = StateType.loading;
     _page++;
     await widget.requestData(
         _page, widget.pageSize, _requestSuccess, _requestError);
@@ -132,12 +138,15 @@ class _BaseListWidgetState extends State<BaseListWidget> {
           ? IndicatorResult.noMore
           : IndicatorResult.success);
     }
+    stateType = isEmpty ? StateType.empty : StateType.success;
   }
 
-  void _requestError(r, s) {
+  void _requestError(code, msg) {
     if (!mounted) {
       return;
     }
+    stateType = StateType.error;
+    ToastUtil.showToast(msg);
     if (_page == 1) {
       _controller.finishRefresh();
     } else {
@@ -191,18 +200,20 @@ class _BaseListWidgetState extends State<BaseListWidget> {
   List<Widget> buildSlivers() {
     final header = buildHeader();
     final footer = buildFooter();
-    Widget? emptyWidget;
-    if (isEmpty) {
-      emptyWidget = widget.emptyWidget;
-    }
     return [
       if (header.position == IndicatorPosition.locator)
         const HeaderLocator.sliver(),
-      if (emptyWidget != null)
+      if (isEmpty && startLoadingFinish)
         SliverFillViewport(
           delegate: SliverChildBuilderDelegate(
             (context, index) {
-              return emptyWidget;
+              return widget.emptyWidget ??
+                  StateLayout(
+                    type: stateType,
+                    emptyImg: "default_drawing_1",
+                    errorImg: "default_drawing_5",
+                    onRefresh: _controller.reload,
+                  );
             },
             childCount: 1,
           ),