Save and print generated barcode as image - flutter

Question

I am using the barcode_widget to generate both barcode and 2d QR code. But I also need to print and save the codes.
My Current code for generating bar code and qr code is as below:
Center(
child: BarcodeWidget(
data: widget.product.productId!,
barcode: Barcode.code128(),
width: 200,
height: 200,
drawText: false,
),
),
and
BarcodeWidget(
data: widget.product.productId!,
barcode: Barcode.qrCode(),
),
Both are inside a Column and I have two buttons called save and print. So how can I save and print the generated codes?

Answer 1

You can use RepaintBoundary
Follow these steps:
1. Create a key.
GlobalKey _screenShotKey = GlobalKey();
2. Wrap the barcode in a repaint boundary and attach the key
RepaintBoundary(
key: _screenShotKey,
child: Center(
child: BarcodeWidget(
data: widget.product.productId!,
barcode: Barcode.code128(),
width: 200,
height: 200,
drawText: false,
),
)
)
3. Import dart:ui as ui
import 'dart:ui' as ui;
4. Create a method to take a screenshot of the widget and save it.
Future<File> takeScreenshot() async {
RenderRepaintBoundary boundary =
_screenShotKey.currentContext.findRenderObject();
ui.Image image = await boundary.toImage();
ByteData byteData = await image.toByteData(format: ui.ImageByteFormat.png);
Uint8List pngBytes = byteData.buffer.asUint8List();
final tempPath = (await getTemporaryDirectory()).path;
final path = tempPath + "qr.png";
File imgFile = File(path);
return imgFile.writeAsBytes(pngBytes);
}
5. To save in gallery/photos app; Use GallerySaver package
void save() async {
takeScreenshot().then((value) async {
bool saved = await GallerySaver.saveImage(value.path);
print(saved);
}).catchError((onError) {});
}