请支持原文：tryenough.com/images-anim…

效果如下图：

代码

import 'package:flutter/material.dart';
import 'package:sprintf/sprintf.dart';  //这个是一个拼接字符串的flutter库，主要是为了使用方便，你可以选择不使用，这样的话你需要自己拼接图片路径class ImagesAnimation extends StatefulWidget {final double w;final double h;final ImagesAnimationEntry entry;final int durationSeconds;ImagesAnimation({Key key, this.w : 80, this.h : 80, this.entry, this.durationSeconds : 3}):super(key:key);@override_InState createState() {return _InState();}
}class _InState extends State<ImagesAnimation> with TickerProviderStateMixin{AnimationController _controller;Animation<int> _animation;@overridevoid initState() {super.initState();_controller = new AnimationController(vsync: this, duration: Duration(seconds: widget.durationSeconds))..repeat();_animation = new IntTween(begin: widget.entry.lowIndex, end: widget.entry.highIndex).animate(_controller);
//widget.entry.lowIndex 表示从第几下标开始，如0；widget.entry.highIndex表示最大下标：如7}@overrideWidget build(BuildContext context) {return new AnimatedBuilder(animation: _animation,builder: (BuildContext context, Widget child) {String frame = _animation.value.toString();return new Image.asset(sprintf(widget.entry.basePath, [frame]), //根据传进来的参数拼接路径gaplessPlayback: true, //避免图片闪烁width: widget.w,height: widget.h,);},);}}class ImagesAnimationEntry {int lowIndex = 0;int highIndex = 0;String basePath;ImagesAnimationEntry(this.lowIndex, this.highIndex, this.basePath);
}
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请支持原文：tryenough.com/images-anim…

使用的地方：

ImagesAnimation(w: 100, h: 100, entry: ImagesAnimationEntry(1, 7, "images/men_sport_%s.png")),
//"images/men_sport_%s.png" 表示图片在你本地的路径，%s会被下标代替
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