Image 颤振：在图像上过度输出图像将其保存在图像上，然后共享
我想在gallery/camera的图像上添加一个简单的图像。行为应该是这样的 打开应用程序，选择一张照片或使用浮动按钮制作一张照片，然后显示图像并将我们的徽标覆盖在左下角。现在一切都好了 然后我想在一张图片中保存这两张图片，但我不知道这个过程是如何调用的，也不知道如何实现它Image 颤振：在图像上过度输出图像将其保存在图像上，然后共享,image,flutter,camera,photo,Image,Flutter,Camera,Photo,我想在gallery/camera的图像上添加一个简单的图像。行为应该是这样的 打开应用程序，选择一张照片或使用浮动按钮制作一张照片，然后显示图像并将我们的徽标覆盖在左下角。现在一切都好了 然后我想在一张图片中保存这两张图片，但我不知道这个过程是如何调用的，也不知道如何实现它 import 'package:share/share.dart'; void main() { runApp(MyApp()); } class MyApp extends StatelessWidget {
import 'package:share/share.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Image Picker Demo',
home: MyHomePage(title: 'Image Picker Example'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
File _imageFile;
dynamic _pickImageError;
String _retrieveDataError;
void _onImageButtonPressed(ImageSource source) async {
try {
_imageFile = await ImagePicker.pickImage(source: source);
} catch (e) {
_pickImageError = e;
}
setState(() {});
}
Widget _previewImage() {
final Text retrieveError = _getRetrieveErrorWidget();
if (retrieveError != null) {
return retrieveError;
}
if (_imageFile != null) {
print('La imagen ha sido puesta en la pantalla?');
return Image.file(_imageFile);
} else if (_pickImageError != null) {
return Text(
'Pick image error: $_pickImageError',
textAlign: TextAlign.center,
);
} else {
return const Text(
'You have not yet picked an image.',
textAlign: TextAlign.center,
);
}
}
Future<void> retrieveLostData() async {
final LostDataResponse response = await ImagePicker.retrieveLostData();
if (response.isEmpty) {
return;
}
if (response.file != null) {
setState(() {
_imageFile = response.file;
});
} else {
_retrieveDataError = response.exception.code;
}
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: SafeArea(
child: Center(
child: Stack(children: <Widget>[
Container(
color: Colors.amber,
child: Platform.isAndroid
? FutureBuilder<void>(
future: retrieveLostData(),
builder:
(BuildContext context, AsyncSnapshot<void> snapshot) {
switch (snapshot.connectionState) {
case ConnectionState.none:
case ConnectionState.waiting:
return const Text(
'You have not yet picked an image.',
textAlign: TextAlign.center,
);
case ConnectionState.done:
return _previewImage();
default:
if (snapshot.hasError) {
return Text(
'Pick image/video error: ${snapshot.error}}',
textAlign: TextAlign.center,
);
} else {
return const Text(
'You have not yet picked an image.',
textAlign: TextAlign.center,
);
}
}
},
)
: (_previewImage())), //
Positioned(
bottom: 16,
left: 16,
width: 100,
height: 100,
child: Image.network(
'http://father-home.ru/wp-content/uploads/2018/05/cropped-logo8.png'))
]))),
floatingActionButton: Column(
mainAxisAlignment: MainAxisAlignment.end,
children: <Widget>[
FloatingActionButton(
onPressed: () {
_onImageButtonPressed(ImageSource.gallery);
},
heroTag: 'image0',
tooltip: 'Pick Image from gallery',
child: const Icon(Icons.photo_library),
),
Padding(
padding: const EdgeInsets.only(top: 16.0),
child: FloatingActionButton(
onPressed: () {
_onImageButtonPressed(ImageSource.camera);
},
heroTag: 'image1',
tooltip: 'Take a Photo',
child: const Icon(Icons.camera_alt),
),
),
Padding(
padding: const EdgeInsets.only(top: 16.0),
child: FloatingActionButton(
onPressed: () {
_onShare();
},
tooltip: 'Share',
child: const Icon(Icons.share),
),
),
],
),
);
}
void _onShare(){
//TODO: save the two images into one and share
}
Text _getRetrieveErrorWidget() {
if (_retrieveDataError != null) {
final Text result = Text(_retrieveDataError);
_retrieveDataError = null;
return result;
}
return null;
}
}
您可以使用重新绘制边界小部件将特定小部件导出到图像。您可以使用重新绘制边界小部件将特定小部件导出到图像。我相信您需要使用位图
请看：我相信您需要使用位图