import 'package:flutter/material.dart';
import 'dart:async';
import 'dart:typed_data';
import 'dart:ui' as ui;
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter/services.dart';
import 'package:path_provider/path_provider.dart';
import 'dart:io';
void main() => runApp(new MyApp());
class MyApp extends StatelessWidget { // This widget is the root of your application. @override Widget build(BuildContext context) { return new MaterialApp( title: 'Flutter Demo', theme: new ThemeData( primarySwatch: Colors.blue, ), home: new MyHomePage(title: 'Flutter Demo Home Page'), ); }
}
class MyHomePage extends StatefulWidget { MyHomePage({Key key, this.title}) : super(key: key); final String title; @override _MyHomePageState createState() => new _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> { static GlobalKey previewContainer = new GlobalKey(); int _counter = 0; void _incrementCounter() { setState(() { // This call to setState tells the Flutter framework that something has // changed in this State, which causes it to rerun the build method below // so that the display can reflect the updated values. If we changed // _counter without calling setState(), then the build method would not be // called again, and so nothing would appear to happen. _counter++; }); } @override Widget build(BuildContext context) { return RepaintBoundary( key: previewContainer, child: new Scaffold( appBar: new AppBar( title: new Text(widget.title), ), body: new Center( child: new Column( mainAxisAlignment: MainAxisAlignment.center, children: <Widget>[ new Text( 'You have pushed the button this many times:', ), new Text( '$_counter', style: Theme.of(context).textTheme.display1, ), new RaisedButton( onPressed: takeScreenShot, child: const Text('Take a Screenshot'), ), ], ), ), floatingActionButton: new FloatingActionButton( onPressed: _incrementCounter, tooltip: 'Increment', child: new Icon(Icons.add), ), // This trailing comma makes auto-formatting nicer for build methods. ) ); } takeScreenShot() async{ RenderRepaintBoundary boundary = previewContainer.currentContext.findRenderObject(); ui.Image image = await boundary.toImage(); final directory = (await getApplicationDocumentsDirectory()).path; ByteData byteData = await image.toByteData(format: ui.ImageByteFormat.png); Uint8List pngBytes = byteData.buffer.asUint8List(); print(pngBytes); File imgFile =new File('$directory/screenshot.png'); imgFile.writeAsBytes(pngBytes); }
}