Capture and share images from RepaintBoundary

captureAndShareImage.dart

Future<void> _captureAndSharePng() async {
    try {
      RenderRepaintBoundary boundary = globalKey.currentContext.findRenderObject();
      var image = await boundary.toImage();
      ByteData byteData = await image.toByteData(format: ImageByteFormat.png);
      Uint8List pngBytes = byteData.buffer.asUint8List();

      final tempDir = await getTemporaryDirectory();
      final file = await new File('${tempDir.path}/image.png').create();
      await file.writeAsBytes(pngBytes);

      final channel = const MethodChannel('channel:me.alfian.share/share');
      channel.invokeMethod('shareFile', 'image.png');

    } catch(e) {
      print(e.toString());
    }
  }