Define a global key GlobalKey previewContainer = GlobalKey ();
Enter fullscreen mode Exit fullscreen mode Wrap the screenshot area with RepaintBoundary FittedBox ( fit: BoxFit . contain , child: RepaintBoundary ( key: previewContainer , child: Container ( // The widget to capture width: 500 , height: 500 , color: Colors . blue , ), ), )
Enter fullscreen mode Exit fullscreen mode Screenshot for the widget Future < Uint8List > _capture () async { RenderRepaintBoundary boundary = previewContainer . currentContext ?. findRenderObject () as RenderRepaintBoundary ; final image = await boundary . toImage ( pixelRatio: 2 ); final byteData = await image . toByteData ( format: ImageByteFormat . png ); return byteData !. buffer . asUint8List (); }
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