use ab cache init show and show custom loading when ab not emtpy

Signed-off-by: 21pages <pages21@163.com>

flutter/lib/common/widgets/loading_dot_widget.dart

@@ -0,0 +1,65 @@
+import 'dart:async';
+import 'package:flutter/material.dart';
+import 'package:get/get.dart';
+
+class LoadingDotWidget extends StatefulWidget {
+  final int count;
+  final double size;
+  final int duration;
+  LoadingDotWidget(
+      {Key? key, required this.size, this.count = 3, this.duration = 200})
+      : super(key: key);
+
+  @override
+  State<LoadingDotWidget> createState() => _LoadingDotWidgetState();
+}
+
+class _LoadingDotWidgetState extends State<LoadingDotWidget> {
+  int counter = 0;
+  Timer? timer;
+
+  @override
+  void initState() {
+    super.initState();
+    startAnimation();
+  }
+
+  @override
+  void dispose() {
+    timer?.cancel();
+    super.dispose();
+  }
+
+  void startAnimation() {
+    timer = Timer.periodic(Duration(milliseconds: widget.duration), (timer) {
+      if (mounted) {
+        setState(() {
+          counter = (counter + 1) % widget.count;
+        });
+      }
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    getChild(int index) {
+      return AnimatedContainer(
+        duration: Duration(milliseconds: widget.duration),
+        width: counter == index ? widget.size : widget.size / 2,
+        height: counter == index ? widget.size : widget.size / 2,
+        decoration: BoxDecoration(
+          shape: BoxShape.circle,
+          color: Colors.grey,
+        ),
+      ).marginSymmetric(horizontal: widget.size);
+    }
+
+    return Center(
+      child: Row(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: List.generate(widget.count, (e) => e)
+              .map((e) => getChild(e))
+              .toList()),
+    );
+  }
+}