在颤动的警报对话框中显示选定的图像 [英] Showing selected image in alert dialog in flutter
问题描述
如何在警报对话框中显示所选图像?
How can i show the selected image in my alert dialog ?
在我的应用程序中，我添加了一个带有摄像头"按钮的警报对话框.当用户单击相机按钮时，另一个警报对话框会要求从图库中选择文件.用户从图库中选择图像文件后，我想使用相机按钮在警报对话框中显示图像，但是该图像仅在重新打开警报对话框后才显示.
In my app, i added an alert dialog which has the camera button. When user clicks the camera button, another alert dialog asks to select file from gallery. After the user selects image file from gallery, i want to show the image in the alert dialog with the camera button, but the image shows only after reopening the alert dialog.
我在下面发布了我的代码.我是新来的扑扑.有人可以帮我吗?预先感谢.
I have posted my code below. I am new to flutter. Please can someone help me? Thanks in advance.
class Test extends StatefulWidget {
@override
_State createState() => new _State();
}
Future<File> imageFile;
class _State extends State<Test> {
Future<void> _openDailog() async {
return showDialog<void>(
context: context,
barrierDismissible: true,
builder: (BuildContext context) {
return AlertDialog(
shape:
RoundedRectangleBorder(borderRadius: BorderRadius.circular(8.0)),
title: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Text('Click Photo'),
Ink(
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(24.0),
color: Colors.blue),
child: IconButton(
color: Colors.white,
icon: Icon(Icons.camera_alt),
onPressed: () {
_cameraOptions();
print("test");
},
),
)
],
),
content: SingleChildScrollView(
child: Container(
width: 300.0,
child: Column(
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.stretch,
mainAxisSize: MainAxisSize.min,
children: <Widget>[
showImage(),
InkWell(
child: Container(
margin: EdgeInsets.only(top: 8.0),
child: RaisedButton(
color: Colors.blue,
child: new Text(
"Send",
style: TextStyle(color: Colors.white),
),
onPressed: () {
Navigator.of(context).pop();
print("test");
},
),
)),
],
),
),
),
);
},
);
}
@override
Widget build(BuildContext context) {
// TODO: implement build
return Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
FloatingActionButton(
heroTag: null,
child: Icon(Icons.insert_drive_file),
onPressed: () {
_openDailog();
},
)
],
);
}
Future<void> _cameraOptions() {
return showDialog(
context: context,
builder: (BuildContext context) {
return AlertDialog(
content: new SingleChildScrollView(
child: new ListBody(
children: <Widget>[
FlatButton(
onPressed: () {
pickImageFromGallery(ImageSource.gallery);
Navigator.of(context).pop();
},
color: Colors.transparent,
child: new Text(
'Select From Gallery',
textAlign: TextAlign.start,
style: new TextStyle(
decoration: TextDecoration.underline,
),
),
),
],
),
),
);
});
}
pickImageFromGallery(ImageSource source) {
setState(() {
imageFile = ImagePicker.pickImage(source: source);
});
}
Widget showImage() {
return FutureBuilder<File>(
future: imageFile,
builder: (BuildContext context, AsyncSnapshot<File> snapshot) {
if (snapshot.connectionState == ConnectionState.done &&
snapshot.data != null) {
return Image.file(
snapshot.data,
width: MediaQuery.of(context).size.width,
height: 100,
);
} else if (snapshot.error != null) {
return const Text(
'Error Picking Image',
textAlign: TextAlign.center,
);
} else {
return const Text(
'No Image Selected',
textAlign: TextAlign.center,
);
}
},
);
}
}
推荐答案
这是因为您需要setState()，但是您不能在警报对话框中执行此操作，因为它没有自己的状态，解决方法因为那将使对话成为其自己的有状态窗口小部件.请查看
That is because you would need to setState() however you can't do that in an alert dialogue as it doesn't have its own state, the workaround for that would be to have the dialogue be its own stateful widget. Please check out this article as it shows how to do that. If you faced problems let me know!
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import 'package:path_provider/path_provider.dart';
void main() {
runApp(new MaterialApp(
home: new MyHomePage(),
));
}
class MyHomePage extends StatefulWidget {
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _selectedIndex = 0;
Widget build(BuildContext context) {
return new Scaffold(
appBar: AppBar(
title: Text("StackoverFlow"),
),
body: Container(),
floatingActionButton: FloatingActionButton(
onPressed: () async {
await _dialogCall(context);
},
),
);
}
Future<void> _dialogCall(BuildContext context) {
return showDialog(
context: context,
builder: (BuildContext context) {
return MyDialog();
});
}
}
class MyDialog extends StatefulWidget {
@override
_MyDialogState createState() => new _MyDialogState();
}
class _MyDialogState extends State<MyDialog> {
String imagePath;
Image image;
@override
Widget build(BuildContext context) {
return AlertDialog(
content: new SingleChildScrollView(
child: new ListBody(
children: <Widget>[
Container(child: image!= null? image:null),
GestureDetector(
child: Row(
children: <Widget>[
Icon(Icons.camera),
SizedBox(width: 5),
Text('Take a picture '),
],
),
onTap: () async {
await getImageFromCamera();
setState(() {
});
}),
Padding(
padding: EdgeInsets.all(8.0),
),
],
),
),
);
}
Future getImageFromCamera() async {
var x = await ImagePicker.pickImage(source: ImageSource.camera);
imagePath = x.path;
image = Image(image: FileImage(x));
}
}
这篇关于在颤动的警报对话框中显示选定的图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
