android - ui.PictureRecorder() 在 flutter 中给出空白输出？

Question

我使用 ui.PictureRecorder() 但它给出了空白输出

    var pictureRecorder = ui.PictureRecorder();
    Canvas canvas = Canvas(pictureRecorder);
    canvas.drawImage(image, Offset.zero, Paint());
    final img = pictureRecorder.endRecording();
    Future<ui.Image> _img = img.toImage(300, 300);
      print('_img:${_img.toString()}');
    canvas.drawImage(_img, Offset(100, 100), Paint());  

when i use this then "The argument type 'Future' can't be assigned to the parameter type 'Image'." this warning occurs and output is blank

Answer 1

对于错误消息“Future”无法分配给参数类型“Image，请更改为
”

Future<ui.Image> _img = img.toImage(300, 300);

至

var _img = await img.toImage(300, 300);

这条线不起作用

canvas.drawImage(_img, Offset(100, 100), Paint());  

因为pictureRecorder adlready结束录制，所以出现错误

Object has been disposed.