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前言：

之前一直看到 有手机充电的时候 有气泡从Type-C 的位置冒泡上来 慢慢上移， 然后和上面的圆圈 会和，感觉还是挺好看的。今天试了下用 Flutter 实现了一版本。大致效果如下，而且气泡 和 气泡直接还可以粘黏

 实现原理：

大致的布局就是这样的： Stack 包裹住所有的元素，需要位置移动的是 AnimatedBuilder，这里是把他们独立出来，方便随机的时候打散处理。

代码实现：

• PageBubble.dart 整个页面 气泡的粘连效果 有点吃性能

  import 'dart:math';
  import 'dart:ui';import 'package:flutter/material.dart';
  import 'package:untitled1a/pages/example1/bubble_dot.dart';class PageBubble extends StatefulWidget {const PageBubble({Key? key}) : super(key: key);@overrideState<PageBubble> createState() => _PageBubbleState();
  }class _PageBubbleState extends State<PageBubble>with SingleTickerProviderStateMixin {late AnimationController _animationController;final Random random = Random();@overridevoid initState() {_animationController = AnimationController(vsync: this,duration: const Duration(milliseconds: 2500),);_animationController.repeat();super.initState();}@overridevoid dispose() {_animationController.dispose();// TODO: implement disposesuper.dispose();}@overrideWidget build(BuildContext context) {return Scaffold(appBar: AppBar(backgroundColor: Theme.of(context).colorScheme.inversePrimary,title: Text('充电气泡'),),body: Align(alignment: Alignment(0.0, 1),child: Container(height: MediaQuery.of(context).size.height / 3 * 2,width: 250,// color: Colors.blue,child: Stack(alignment: Alignment.topCenter,children: [...buildAnimatedPositioned(),Padding(padding: const EdgeInsets.only(top: 40,left: 0,),child: RotationTransition(alignment: Alignment.center,turns: _animationController,child: Container(width: 200,height: 200,decoration: const BoxDecoration(color: Colors.deepPurple,borderRadius: BorderRadius.only(topRight: Radius.circular(70),topLeft: Radius.circular(90),bottomRight: Radius.circular(60),bottomLeft: Radius.circular(80),),),),),),//这个效果很有意思 就是有费性能  不需要可以移除掉BackdropFilter(filter: ImageFilter.dilate(radiusX: 3.0, radiusY: 3.0),child: Container(),),Positioned(left: 35,top: 45,child: Container(width: 180,height: 180,decoration: BoxDecoration(color: Colors.black,borderRadius: BorderRadius.circular(90),),child: const Center(child: Text('89%',style: TextStyle(fontSize: 40,color: Colors.white,),),),),),],),),),);}int getRandomNumber(int min, int max) {var random = Random();return min + random.nextInt(max - min + 1);}List<Widget> buildAnimatedPositioned() {List<Widget> _list = [];List.generate(9,(index) => {_list.add(BubbleDot(time: getRandomNumber(2000, 3500))),});return _list;}
  }
  

• BubbleDot.dart    气泡效果    之所以把气泡单独出来是为了后面的随机打散操作

  import 'dart:math';
  import 'package:flutter/material.dart';class BubbleDot extends StatefulWidget {final int time;const BubbleDot({super.key, required this.time});@overrideState<BubbleDot> createState() => _BubbleDotState();
  }class _BubbleDotState extends State<BubbleDot>with SingleTickerProviderStateMixin {late AnimationController _animationController;late Animation<double> _animation;final Random random = Random();late double _leftPos = 0;late double _dotWidth = 0;@overridevoid initState() {_animationController = AnimationController(vsync: this,duration: Duration(milliseconds: widget.time),);_animation = _animationController.drive(Tween<double>(begin: getRandomNumber(660, 800).toDouble(), end: 100));//_leftPos = random.nextDouble() * 200;_leftPos = getRandomNumber(35, 180).toDouble();_dotWidth = getRandomNumber(30, 66).toDouble();_animationController.addStatusListener((AnimationStatus status) => {print('status  $status')});_animationController.repeat();// TODO: implement initStatesuper.initState();}@overridevoid dispose() {// TODO: implement dispose_animationController.dispose();super.dispose();}@overrideWidget build(BuildContext context) {return AnimatedBuilder(animation: _animation,builder: (BuildContext context, Widget? child) {return Positioned(top: _animation.value,//top: 240,left: _leftPos,child: ClipOval(child: Container(width: _dotWidth,height: _dotWidth,decoration: BoxDecoration(color: Colors.deepPurple,boxShadow: [BoxShadow(color: Colors.deepPurple.withOpacity(0.5),spreadRadius: 6,blurRadius: 8,offset: Offset(4, 4), // changes position of shadow),],),),),);},);}int getRandomNumber(int min, int max) {return min + random.nextInt(max - min + 1);}
  }