I have a gif image to show in flutter. I want to show it's first frame as a still image. How can I achieve this thing in flutter?

I want to show it as a static image (first frame of gif image).

CodePudding user response：

You can use CustomPaint to draw the first frame of GIF and show the custom widget on the screen.

Here are the steps:

1. Create a XFile with the GIF file:

   XFile file = XFile('xxx.gif');
   

2. Load the XFile to ui.Image:

    Future<ui.Image> loadImage(XFile file) async {
     final data = await file.readAsBytes();
     return await decodeImageFromList(data);
   }
   

3. Create a custom widget with CustomPaint and CustomPainter:

    Widget createCustomImage(ui.Image image) {
      return SizedBox(
        width: image.width.toDouble(),
        height: image.height.toDouble(),
        child: CustomPaint(
          painter: ImagePainter(image),
        ),
      );
    }
   
    class ImagePainter extends CustomPainter {
      ImagePainter(this. Image);
      final ui.Image image;
   
      @override
      void paint(Canvas canvas, Size size) {
        final paint = Paint()
          ..color = Colors.red
          ..strokeWidth = 5
          ..style = PaintingStyle.stroke;
   
        canvas.drawImage(image, Offset.zero, paint);
      }
   
      @override
      bool shouldRepaint(ImagePainter oldDelegate) =>
          image != oldDelegate.image;
    }
   

A little bit complicated, but it can work.