如何从 imageUrl 转换图像数据类型

Question

我需要将此水印（来自资产）图像和 imageurl（从 API 获取）转换为 Image 数据类型，因为 ui.drawImage 仅采用 Image 数据类型

 ui.Image? watermarkImage = ui.decodeImage('assets/images/watermark.png');// getting error
    ui.Image? lookbookImage = ui.decodeImage(imageurl); // getting error
    final originalImage = imgData;
    ui.Image image = ui.Image(160, 50);
    ui.drawImage(image, watermarkImage);

Answer 1

首先，您需要获取图像字节

// network
final response = await http.Client().get(Uri.parse(imageurl));
final bytes = response.bodyBytes;

//assets
final byteData = await rootBundle.load('assets/images/watermark.png');
final bytes = byteData.buffer.asUint8List();

然后你可以从图像字节解码ui.Image

final image = await decodeImageFromList(bytes);