Flutter 在第二次尝试中传递图像,而不是在第一次尝试中传递图像
我需要一些关于Flitter中图像选择器插件的帮助。当我在“警报”对话框中按“图像”或“多媒体资料”并选择“我的图像”时,背景图像显示但未通过/保存,但当我再次在“警报”对话框中按“图像”或“多媒体资料”并选择“我的图像”时,背景图像显示且通过/保存。我该怎么办Flutter 在第二次尝试中传递图像,而不是在第一次尝试中传递图像,flutter,flutter-dependencies,Flutter,Flutter Dependencies,我需要一些关于Flitter中图像选择器插件的帮助。当我在“警报”对话框中按“图像”或“多媒体资料”并选择“我的图像”时,背景图像显示但未通过/保存,但当我再次在“警报”对话框中按“图像”或“多媒体资料”并选择“我的图像”时,背景图像显示且通过/保存。我该怎么办 import 'dart:io'; import 'package:flutter/material.dart'; import 'package:image_picker/image_picker.dart'; class User
import 'dart:io';
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
class UserImagePicker extends StatefulWidget {
UserImagePicker(this.imagePickfn);
final void Function(File pickedImage) imagePickfn;
@override
_UserImagePickerState createState() => _UserImagePickerState();
}
class _UserImagePickerState extends State<UserImagePicker> {
File _pickedImage;
void _pickImage() {
showDialog<ImageSource>(
context: context,
builder: (context) =>
AlertDialog(title: Text("Choose image source"), actions: [
FlatButton(
child: Text("Camera"),
onPressed: () => Navigator.pop(context, ImageSource.camera),
),
FlatButton(
child: Text("Gallery"),
onPressed: () => Navigator.pop(context, ImageSource.gallery),
),
]),
).then((ImageSource source) async {
if (source != null) {
final pickedFile = await ImagePicker().getImage(
source: source,
imageQuality: 50,
maxWidth: 150,
);
setState(() => _pickedImage = File(pickedFile.path));
}
});
widget.imagePickfn(_pickedImage);
}
@override
Widget build(BuildContext context) {
return Column(
children: <Widget>[
CircleAvatar(
radius: 40,
backgroundColor: Theme.of(context).primaryColor,
backgroundImage:
_pickedImage != null ? FileImage(_pickedImage) : null,
),
FlatButton.icon(
textColor: Theme.of(context).primaryColor,
onPressed: _pickImage,
icon: Icon(Icons.image),
label: Text('Add an Image'),
),
],
);
}
}
导入'dart:io';
进口“包装:颤振/材料.省道”;
导入“包:image_picker/image_picker.dart”;
类UserImagePicker扩展StatefulWidget{
UserImagePicker(this.imagePickfn);
最终无效函数(文件pickedImage)imagePickfn;
@凌驾
_UserImagePickerState createState()=>\u UserImagePickerState();
}
类_UserImagePickerState扩展状态{
文件_pickedImage;
void _pickImage(){
显示对话框(
上下文:上下文,
生成器:(上下文)=>
AlertDialog(标题:文本(“选择图像源”),操作:[
扁平按钮(
子:文本(“摄影机”),
按下:()=>Navigator.pop(上下文、ImageSource.camera),
),
扁平按钮(
儿童:文本(“图库”),
按下:()=>Navigator.pop(上下文,ImageSource.gallery),
),
]),
).then((图像源)异步{
如果(源!=null){
final pickedFile=Wait ImagePicker().getImage(
资料来源:资料来源,
图像质量:50,
最大宽度:150,
);
setState(()=>_pickedImage=File(pickedFile.path));
}
});
widget.imagePickfn(_pickedImage);
}
@凌驾
小部件构建(构建上下文){
返回列(
儿童:[
圆形(
半径:40,
背景色:主题。背景色,
背景图片:
_pickedImage!=null?文件映像(_pickedImage):null,
),
FlatButton.icon(
textColor:Theme.of(context.primaryColor),
按下按钮:_pickImage,
图标:图标(Icons.image),
标签:文本(“添加图像”),
),
],
);
}
}
问题出在\u pickImage()
方法中。您需要移动widget.imagePickfn(_pickedImage)代码>内部然后部分。像这样
void _pickImage() {
showDialog<ImageSource>(
context: context,
builder: (context) =>
AlertDialog(title: Text("Choose image source"), actions: [
FlatButton(
child: Text("Camera"),
onPressed: () => Navigator.pop(context, ImageSource.camera),
),
FlatButton(
child: Text("Gallery"),
onPressed: () => Navigator.pop(context, ImageSource.gallery),
),
]),
).then((ImageSource source) async {
if (source != null) {
final pickedFile = await ImagePicker().getImage(
source: source,
imageQuality: 50,
maxWidth: 150,
);
setState(() => _pickedImage = File(pickedFile.path));
widget.imagePickfn(_pickedImage);
}
});
}
它不起作用,再次在第二次尝试中接受输入。添加了另一个解决方案,希望第二个解决方案能够解决您的问题。它不起作用,再次是相同的问题。在第二次尝试中拾取图像。谢谢你的回复。
import 'dart:io';
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
class UserImagePicker extends StatefulWidget {
UserImagePicker(this.imagePickfn);
final void Function(File pickedImage) imagePickfn;
@override
_UserImagePickerState createState() => _UserImagePickerState();
}
class _UserImagePickerState extends State<UserImagePicker> {
File _pickedImage;
void _pickImage() async {
ImageSource source = await showDialog<ImageSource>(
context: context,
builder: (context) =>
AlertDialog(title: Text("Choose image source"), actions: [
FlatButton(
child: Text("Camera"),
onPressed: () => Navigator.pop(context, ImageSource.camera),
),
FlatButton(
child: Text("Gallery"),
onPressed: () => Navigator.pop(context, ImageSource.gallery),
),
]),
);
if (source != null) {
final pickedFile = await ImagePicker().getImage(
source: source,
imageQuality: 50,
maxWidth: 150,
);
setState(() => _pickedImage = File(pickedFile.path));
widget.imagePickfn(_pickedImage);
}
}
@override
Widget build(BuildContext context) {
return Column(
children: <Widget>[
CircleAvatar(
radius: 40,
backgroundColor: Theme.of(context).primaryColor,
backgroundImage:
_pickedImage != null ? FileImage(_pickedImage) : null,
),
FlatButton.icon(
textColor: Theme.of(context).primaryColor,
onPressed: () => _pickImage(),
icon: Icon(Icons.image),
label: Text('Add an Image'),
),
],
);
}
}