Question

我是否可以通过一种方法将动态加载的图像文件合并为一个图像文件？

我已添加图片。我需要将加载的图像合并为一张我已使用的代码，如下所示


import 'dart:io';
import 'package:flutter/material.dart';
import 'package:image/image.dart' as immg;
import 'package:image_cropper/image_cropper.dart';
import 'package:image_picker/image_picker.dart';

import 'package:http/http.dart' as http;
import 'dart:convert';

import 'package:merge_images/merge_images.dart';


class SingleImageUpload extends StatefulWidget {
  @override
  _SingleImageUploadState createState() {
    return _SingleImageUploadState();
  }
}

class _SingleImageUploadState extends State<SingleImageUpload> {
  List<Object> images = List<Object>();
  List<File> imgList = List<File>();
  List<Image> listimg = List<Image>();

  File _selectedFile;
  bool _inProcess = false;
  Map data = {};
  Readerservice _readerservice;
  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    setState(() {
      images.add("Add Image");
      images.add("Add Image");
      images.add("Add Image");
      images.add("Add Image");
    });
  }

  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      debugShowCheckedModeBanner: false,
      home: new Scaffold(
        appBar: AppBar(
          backgroundColor: Colors.white,
          leading: Padding(
            padding: EdgeInsets.only(left: 12),
            child: IconButton(
              icon: Icon(Icons.arrow_back_ios,
                color: Colors.black,
                size: 30,),
              onPressed: () {
                Navigator.pushNamed(context, '/Mainpage');

              },
            ),
          ),
          title: Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children:<Widget>[
                Text('Basic AppBar'),
              ]
          ),
          actions: <Widget>[

            IconButton(
              icon: Icon(Icons.more_vert,
                color: Colors.black,
                size: 30,),
              onPressed: () {
                print('Click start');
              },
            ),
          ],

        ),
        body:
        
            SizedBox(height: 40),
            
            Expanded(
              child: buildGridView(),
            ),
            RaisedButton(
              textColor: Colors.white,
              color: Colors.orange,
              child: Text("Finish",
                style: TextStyle(fontSize: 15),),
              onPressed: () {
                pasimage();
              },
              shape: new RoundedRectangleBorder(
                borderRadius: new BorderRadius.circular(8.0),
              ),
            ),
          ],

        ),
      ),

    );
  }

  Widget buildGridView() {
    return GridView.count(
      shrinkWrap: true,
      crossAxisCount: 3,
      childAspectRatio: 1,
      children: List.generate(images.length, (index) {
        if (images[index] is ImageUploadModel) {
          ImageUploadModel uploadModel = images[index];
          return Card(
            clipBehavior: Clip.antiAlias,
            child: Stack(
              children: <Widget>[
                Image.file(
                  uploadModel.imageFile,
                  width: 300,
                  height: 300,
                ),
                Positioned(
                  right: 5,
                  top: 5,
                  child: InkWell(
                    child: Icon(
                      Icons.remove_circle,
                      size: 20,
                      color: Colors.red,
                    ),
                    onTap: () {
                      setState(() {
                        images.replaceRange(index, index + 1, ['Add Image']);
                      });
                    },
                  ),
                ),
              ],
            ),
          );
        } else {
          return Card(
            child: IconButton(
              icon: Icon(Icons.add),
              onPressed: () {
                //popup
                showDialog(
                  context: context,
                  builder: (context) {
                    return Dialog(
                      shape: RoundedRectangleBorder(
                          borderRadius: BorderRadius.circular(10)),
                      elevation: 16,
                      child: Container(
                        height: 180.0,
                        width: 330.0,
                        child: ListView(
                          children: <Widget>[
                            SizedBox(height: 20),
                            //Center(
                            Padding(
                              padding: const EdgeInsets.only(left: 15.0),
                              child: Text(
                                "Add a Receipt",
                                textAlign: TextAlign.left,
                                style: TextStyle(
                                    fontSize: 24,
                                    color: Colors.black,
                                    fontWeight: FontWeight.bold),
                              ),
                            ),
                            // ),
                            SizedBox(height: 20),
                            FlatButton(
                              child: Text(
                                'Take a photo..',
                                textAlign: TextAlign.left,
                                style: TextStyle(fontSize: 20),
                              ),
                              onPressed: () {
                                _onAddImageClick(index,ImageSource.camera);
                                Navigator.of(context).pop();

                                // picker.getImage(ImageSource.camera);
                              },
                              textColor: Colors.black,
                            ),
                            FlatButton(
                              child: Text(
                                'Choose from Library..',
                                style: TextStyle(fontSize: 20),
                                textAlign: TextAlign.left,
                              ),
                              onPressed: () {
                                _onAddImageClick(index,ImageSource.gallery);
                                Navigator.of(context).pop();
                              },
                              textColor: Colors.black,
                            ),
                          ],
                        ),
                      ),
                    );
                  },
                );
                //pop ends
                //_onAddImageClick(index);
              },
            ),
          );
        }
      }),
    );

  }

  Future  _onAddImageClick(int index, ImageSource source ) async {
    setState(() {
      _inProcess = true;
    });
    File image = await ImagePicker.pickImage(source: source);
      if(image != null){
        File cropped = await ImageCropper.cropImage(
            sourcePath: image.path,
            maxWidth: 1080,
            maxHeight: 1080,

            compressFormat: ImageCompressFormat.jpg,
            androidUiSettings: AndroidUiSettings(
                toolbarColor: Colors.black,
                toolbarWidgetColor: Colors.white,
                //toolbarTitle: "RPS Cropper",
                statusBarColor: Colors.deepOrange.shade900,
                backgroundColor: Colors.black,
                initAspectRatio: CropAspectRatioPreset.original,
                lockAspectRatio: false
            ),
            iosUiSettings: IOSUiSettings(
              minimumAspectRatio: 1.0,
            )
        );

        this.setState((){
          _selectedFile = cropped  ;
          _inProcess = false;
        });
      } else {
        this.setState((){
          _inProcess = false;
        });
      }
      getFileImage(index);
    }


  void getFileImage(int index) async {
//    var dir = await path_provider.getTemporaryDirectory();
      setState(() {
        ImageUploadModel imageUpload = new ImageUploadModel();
        imageUpload.isUploaded = false;
        imageUpload.uploading = false;
        imageUpload.imageFile = _selectedFile ;
        imageUpload.imageUrl = '';
        imgList.add(imageUpload.imageFile);
        images.replaceRange(index, index + 1, [imageUpload]);
        print(imgList);
      });
  }
void pasimage(){

for(var i=0;i<imgList.length;i++){
  final imaes = immg.decodeImage(imgList[i].readAsBytesSync()) as Image;
  listimg.add(imaes);
}

  Navigator.pushReplacementNamed(context, '/crop',arguments: {
    'imageList':ImagesMerge(
      listimg,///required,images list
      direction: Axis.vertical,///direction
      backgroundColor: Colors.black26,///background color
      fit: false,///scale image to fit others
      //controller: captureController,///controller to get screen shot
    ),
  });
}

}

class ImageUploadModel {
  bool isUploaded;
  bool uploading;
  File imageFile;
  String imageUrl;

  ImageUploadModel({
    this.isUploaded,
    this.uploading,
    this.imageFile,
    this.imageUrl,
  });
}

我使用了来自pub.dev的图像合并包，我已经在pasimage（）函数中实现了它，但是出现了错误。

**无法将参数类型'列表（其中在C：\ src \ flutter \ packages \ flutter \ lib \ src \ widgets \ image.dart中定义图像）'分配给参数类型'列表（图片是在C：\ src \ flutter \ bin \ cache \ pkg \ sky_engine \ lib \ ui \ painting.dart）中定义的）。 **

错误图片已附加

Answer 1

import 'dart:ui' as ui;
List<ui.Image> listimg = List<ui.Image>();

...

void pasimage(){
   for(var i=0;i<imgList.length;i++){
      final imaes = await ImagesMergeHelper.loadImageFromFile(imgList[i]) as ui.Image;
      listimg.add(imaes);
   }

  Navigator.pushReplacementNamed(context, '/crop',arguments: {
    'imageList':ImagesMerge(
      listimg,///required,images list
      direction: Axis.vertical,///direction
      backgroundColor: Colors.black26,///background color
      fit: false,///scale image to fit others
      //controller: captureController,///controller to get screen shot
    ),
  });
}

尝试此代码。

有没有一种方法可以将动态加载的图像文件合并到一个图像文件中？

1 个答案: