on release build apk crop widget seems container filled grey. on debug apk no problem.

[demirdev]

I develop app on debug and crop widget works great.
But on release version of apk, crop widget seems complete grey box like below.

I showing MyCustomCropWidget in stack with showCrop variable.

// Stack .. [...
// Camera Preview ,
Visibility(
              visible: showCrop,
              child: MyCustomCropWidget(
                imagePath: imagePath,
                clipOkay: clipOkay,
                deleteAllPhotos: () {
                  deleteAllPhotos();
                  setState(() {
                    showCrop = false;
                  });
                },
              ),
            )
// .... ] / stack

import 'dart:io';

import 'package:flutter/material.dart';
import 'package:image_crop/image_crop.dart';
import 'package:path/path.dart';
import 'package:myapp/common/widgets/cancel_button.dart';
import 'package:myapp/helpers/file_helper.dart';

class MyCustomCropWidget extends StatefulWidget {
  final String imagePath;
  final Function clipOkay;
  final Function deleteAllPhotos;

  const MyCustomCropWidget(
      {Key key, this.imagePath, this.clipOkay, this.deleteAllPhotos})
      : super(key: key);
  @override
  _MyCustomCropWidgetState createState() => _MyCustomCropWidgetState();
}

class _MyCustomCropWidgetState extends State<MyCustomCropWidget> {
  final cropKey = GlobalKey<CropState>();

  @override
  Widget build(BuildContext context) {
    return Container(
      color: Colors.black,
      child: Stack(
        children: [
          Container(
            padding: const EdgeInsets.all(20.0),
            child: Crop(
              key: cropKey,
              image: FileImage(File(widget.imagePath)),
//        aspectRatio: 4.0 / 3.0,
            ),
          ),
          Positioned(
            left: 0,
            right: 0,
            bottom: 0,
            child: Stack(
              children: [
                CancelButton(
                  onPressed: widget.deleteAllPhotos,
                ),
                Padding(
                  padding: const EdgeInsets.only(bottom: 16.0),
                  child: Positioned.fill(
                    child: Align(
                      alignment: Alignment.center,
                      child: IconButton(
                        icon: Icon(Icons.check),
                        color: Colors.white,
                        iconSize: 60,
                        onPressed: () async {
                          print("Image Source for Crop: " + widget.imagePath);

                          final croppedImage = await ImageCrop.cropImage(
                            file: File(widget.imagePath),
                            area: cropKey.currentState.area,
                          );
                          print("cropped image path: " + croppedImage.path);

                          // delete original image.

                          await File(widget.imagePath).delete();

                          String fileLocation =
                              join(await FileHelper.localPath, "files/");
                          if (!(await Directory(fileLocation).exists()))
                            await Directory(fileLocation).create();

                          fileLocation =
                              join(fileLocation, basename(croppedImage.path));
                          await FileHelper.moveFile(
                              File(croppedImage.path), fileLocation);

                          widget.clipOkay(fileLocation);
                        },
                      ),
                    ),
                  ),
                ),
              ],
            ),
          )
        ],
      ),
    );
  }
}

[demirdev]

I realize got error when buildcrop widget about stacked children. I removed Positioned.fill widgets and change Stack widgets to Column and Row widgets. Problem solved. Please remove this issue. Thanks.