import 'package:flutter/material.dart'; import 'dart:ui' as ui; void main() { runApp(MyApp()); } class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( home: Scaffold( appBar: AppBar( title: Text('Render Widget to Image'), ), body: ...
3.widget转图片方法 Future<Uint8List>widgetToImage()async{Completer<Uint8List>completer=Completer();RenderRepaintBoundaryrender=_globalKey.currentContext!.findRenderObject()asRenderRepaintBoundary;ui.Imageimage=awaitrender.toImage();ByteData?byteData=awaitimage.toByteData(format:ui.ImageByteFormat.png);comp...
.buffer.asUint8List();imgFile.writeAsBytes(pngBytes!);setState((){imagePath=imgFile.path;});} 源码 https://github.com/sayhellotogithub/flutter-widget-to-image 参考 https://medium.com/flutter-community/export-your-widget-to-image-with-flutter-dc7ecfa6bafb https://api.flutter.dev/flutter/...
varbyteData=awaitMapImageUtil.widgetToImage(widget,size:constSize(300,400));returnBitmapDescriptor.fromBytes(byteData.buffer.asUint8List()); 真的是坑啊
flutter中将widget转为base64 flutter中可以通过RepaintBoundary widget中的toImage方法将页面中的widget转为base64。 如何使用? 首先要在全局定义一个global key,分配给RepaintBoundary。然后将要转化为图片的widget用RepaintBoundary包裹。 关键代码: RenderRepaintBoundary boundary =_globalKey.currentContext.findRenderObject()...
bytes; WidgetsToImage( controller: controller, child: cardWidget(), ), final bytes = await controller.capture(); Screenshots Helper resource Thanks to Parth Jansari (Twitter: @JohannesMilke) https://medium.com/flutter-community/export-your-widget-to-image-with-flutter-dc7ecfa6bafb https://www...
扩充如下代码,参照Text Widget演示示例代码形式,实现主页面列表中Image Widget、Icon Widget、IconButton Widget、RaisedButton Widget以及horizontal ListView Widget示例演示。 //main.dartimport'package:flutter/material.dart'; import'text_widget.dart';voidmain() { ...
/// The completer that has been assigned to this image stream. /// /// Generally there is no need to deal with the completer directly. ImageStreamCompleter get completer => _completer; ImageStreamCompleter _completer; 可见ImageStream主要是由ImageStreamCompleter来提供支持,只是一个ImageStreamComplet...
ui.Image image = await boundary.toImage(); Logs It will throw an error flutter: 'package:flutter/src/rendering/proxy_box.dart': Failed assertion: line 2882 pos 12: '!debugNeedsPaint': is not true. running flutter doctor -v [✓] Flutter (Channel dev, v1.9.7, on Mac OS X 10.14....
Flutter图片添加水印功能,Flutter保存Widget为图片 题记 —— 执剑天涯,从你的点滴积累开始,所及之处,必精益求精,即是折腾每一天。 添加水印,两种实现思路,一种是将图片与水印解码,然后混编再编码,另一种是通过Widget的方式合成。 在这里采用的实现思路是使用层叠布局Stack加载图片以及水印部分,水印部分可能是一个...