导入要使用的轮播图片

 List<String> imagesa = ["assets/images/car_qidian.jpg","assets/images/car_bg.jpg","assets/images/car_bg.jpg","assets/images/car_bg.jpg","assets/images/car_bg.jpg","assets/images/car_bg.jpg","assets/images/car_bg.jpg","assets/images/car_bg.jpg","assets/images/car_bg.jpg","assets/images/car_bg.jpg"];

声明变量

late PageController _controller;
Timer? _timer,

//背景图动画void startTimer() {_timer = Timer.periodic(const Duration(seconds: 1), (timer) {if (_controller.hasClients) {     if (_controller.page!.round() >= imagesa.length - 1) {      _controller.jumpToPage(0);} else {_controller.nextPage(duration: const Duration(seconds: 1),curve: Curves.linear,);}}});}void pauseTimer() {_timer?.cancel();}void restartTimer() {_timer?.cancel();startTimer();}// 背景使用void _onPageChanged() {int newIndex = _controller.page!.round() % imagesa.length;if (newIndex != _currentPage) {setState(() {_currentPage = newIndex;});}}

然后在initState里面初始化一下

@overridevoid initState() {super.initState();startTimer(); 
}

在dispose里面去掉

  @overridevoid dispose() {_controller.dispose();_timer?.cancel();super.dispose();}

最后在你需要的地方加入下面代码就行了

//背景图SizedBox(height: 750.h,child: PageView.builder(physics: const NeverScrollableScrollPhysics(),controller: _controller,itemBuilder: (context, index) {final imageIndex = index % imagesa.length;return Image.asset(imagesa[imageIndex],width: double.infinity,height: 750.h,fit: BoxFit.fitHeight,gaplessPlayback: true,);},),),