How to take a screenshot of the current widget - Flutter

Question

I need to take a screenshot of the current screen or widget and I need to write it into a file.

Answer 1

let's say you want to take a screenshot of the FlutterLogo widget . wrap it in a RepaintBoundary with will creates a separate display list for its child . and provide with a key

var scr= new GlobalKey();
RepaintBoundary(
         key: scr,
         child: new FlutterLogo(size: 50.0,))

and then you can get the pngBytes by converting the boundary to an image

takescrshot() async {
  RenderRepaintBoundary boundary = scr.currentContext.findRenderObject();
  var image = await boundary.toImage();
  var byteData = await image.toByteData(format: ImageByteFormat.png);
  var pngBytes = byteData.buffer.asUint8List();
  print(pngBytes);
  }