Widget with images does not work

[jijo0465]

The widgets with image providers is not working. I tried giving image as container boxDecoration and Image.asset, both failed.

[itsJoKr]

Hey, the images will not work. The reason is that they are lazily fetched and they need some time to be read into memory.

There are two fixes for this:

1. Proper fix: is to not use markers_generator_sample because it is not made to support images. It is made as a quicky way of converting simple widgets to markers. A proper fix would probably mean drawing on dart:ui canvas and converting that to bitmap without using widgets at all.
2. Quick fix: would probably mean using precacheImage and delaying the generation, for example wrap MarkerGenerator.generate with some delay: Future.delayed(Duration(milliseconds: 50), () {

[CongBaDo]

Hey, the images will not work. The reason is that they are lazily fetched and they need some time to be read into memory.

There are two fixes for this:

1. Proper fix: is to not use markers_generator_sample because it is not made to support images. It is made as a quicky way of converting simple widgets to markers. A proper fix would probably mean drawing on dart:ui canvas and converting that to bitmap without using widgets at all.
2. Quick fix: would probably mean using precacheImage and delaying the generation, for example wrap MarkerGenerator.generate with some delay: Future.delayed(Duration(milliseconds: 50), () {

It does not work

[C4s4r]

I was able to precache my svg images on startup, which leads to a working marker generation.

precachePicture(ExactAssetPicture(SvgPicture.svgStringDecoder, 'assets/images/image.svg'), null);

[memoriasIT]

I did also manage to load images with this. I required both a precachePicture and an await of a delayed future. I also upgraded this to null-safety (I am currently running >=2.17.5 <3.0.0). I will open a PR for it when I apply the concept to your simple example.

[memoriasIT]

Hey, update on this. Although this is a nice workaround, it is really unstable. I spent a lot of hours to apply this, but it is just not worth it. I ended up using "DavinciCapture" (https://pub.dev/packages/davinci) Generating a bitmap is as easy as:

await DavinciCapture.offStage(
      widget,
      openFilePreview: false,
      returnImageUint8List: true,
    ) as Uint8List;

Then wrap the data with a bitmap descriptor: BitmapDescriptor.fromBytes(bitmap)

There's no need for context here, no problems with race conditions and no null issues.