如何将Flutter画布另存为位图图像? [英] How to save a Flutter canvas as a bitmap image?

问题描述

我有一个Flutter 画布，我d想将该画布另存为位图图像(例如PNG，但是可以使用任何常见的位图格式).将画布中的位转换为位图图像格式的最佳方法是什么?

I have a Flutter canvas , and I'd like to save that canvas as a bitmap image (e.g. PNG, but any common bitmap format will do). What's the best way to get the bits out of a canvas, converted to a bitmap image format?

非常感谢！

推荐答案

1. 创建 PictureRecorder .
2. 用PictureRecorder创建 Canvas 并画东西.
3. 在PictureRecorder上调用 endRecording() 来得到 Picture .
4. 在Picture上调用 toImage() .
5. 在 Image 上调用toByteData().糟糕，此功能尚未实现.我提交了问题.

1. Create a PictureRecorder.
2. Create a Canvas with your PictureRecorder and draw stuff.
3. Call endRecording() on the PictureRecorder to get a Picture.
4. Call toImage() on the Picture.
5. Call toByteData() on the Image. Oops, this isn't implemented yet. I filed an issue.

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