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? [英] is there a way to merge dynamically loaded image file to one image file in flutter?
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问题描述
I 是否有一种方法可以动态地将动态加载的图像文件合并到一个图像文件中?
Is there a way to merge dynamically loaded image file to one image file in flutter?
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
I have added the image. I needed to merge the loaded image to one image the code I have used is given below
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.
I have used image merge package from pub.dev I have implemented it in pasimage() function but I got the error.
**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). **
** The argument type 'List (where Image is defined in C:\src\flutter\packages\flutter\lib\src\widgets\image.dart)' can't be assigned to the parameter type 'List (where Image is defined in C:\src\flutter\bin\cache\pkg\sky_engine\lib\ui\painting.dart)'. **
附加了错误图片
推荐答案
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.
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