I have an image with a container on it. I want to be able to edit the TextField inside the container and save the image as an image to the device.
My current setup is a stack where I have the image and a container on top of each other. How can I save that as an image?
Note that I don't want to save the whole screen, just the image and whatever on it.
Future<File> createWave(BuildContext context, GlobalKey screen) async {
RenderRepaintBoundary boundary = screen.currentContext.findRenderObject();
ui.Image image = await boundary.toImage();
ByteData byteData = await image.toByteData(format: ui.ImageByteFormat.png);
Uint8List pngBytes = byteData.buffer.asUint8List();
final directory = (await getApplicationDocumentsDirectory()).path;
File imgFile = File('$directory/screenshot.png');
await imgFile.writeAsBytes(pngBytes);
return imgFile;
}
Thankfully since flutter uses skia to render it's graphics, we are able to take screenshots of widgets and there is already a really good article that does somethings similar. Basically you wrap your widget in a RepaintBoundary and assign it a key then use the key to call the RenderObject.toImage method. Here is another simple example to do this. It's amazing how simple it is :D
Related
In Flutter, how do you get a screenshot for an arbitrary screen resolution? I.e. for a screen resolution that's different from the resolution the app is running in?
Is there a way to tell the Flutter engine to paint a single frame into a buffer with a specific resolution?
What I'm trying to accomplish is to generate the screenshots for the various app stores from within the app, but without scaling and cropping screenshots that were taken for different devices/resolutions.
How would you tackle that requirement?
Any advise is welcome,
Thank you!
if you are talking about taking a screenshot of a particular widget and saving it
the you have to use renderrepaint boundry with key .
dependencies - path provider
Image gallery saver ..
takeScreenshot(BuildContext context,GlobalKey _key,String slug) async {
RenderRepaintBoundary boundary = _key.currentContext.findRenderObject();
ui.Image image = await boundary.toImage(pixelRatio: 3.0);
final snackBar = SnackBar(content: Text("Image saved to gallery"));
ScaffoldMessenger.of(context).showSnackBar(snackBar);
final directory = (await getApplicationDocumentsDirectory()).path;
ByteData byteData = await image.toByteData(format: ui.ImageByteFormat.png);
final result = await ImageGallerySaver.saveImage(
byteData.buffer.asUint8List(),
name: "name.jpg");
}
I'm making a Flutter project where an image is displayed in listview and the user can share, favourite or download the image. I'm stuck on the downloading part. Is it possible to save an image file onto the phone's storage for offline use?
What I want to happen is I can create and write an image file
Future<String> get _localPath async {
final directory = await getApplicationDocumentsDirectory();
return directory.path;
}
Future<File> get _localFile async {
final path = await _localPath;
return File('$path/$title.txt');
}
// Write an image by obtaining an image through a URL
and then be able to access it through
Image.file('$path/$title.txt')
I'm using a native surface view in a flutter When I take a screenshot using a repaint boundary widget. black screen issue occurs.
My code :
RenderRepaintBoundary boundary =_globalKey.currentContext.findRenderObject();
ui.Image image = await boundary.toImage(pixelRatio: 3.0);
ByteData byteData =
await image.toByteData(format: ui.ImageByteFormat.png);
Please guide me for solution
I'm developing a punch clock in a tablet with Flutter Application and I need this functionality.
I know how to make the camera show and the user make a screenshot, but I searched everywhere how to make an automatic self screenshot after 3 seconds and don't find anything.
Someone has an example, tutorial, or experience to make something like this?
You can use Timer class to do some action after certain time duration as shown below
Timer(Duration(milliseconds: 3000), () {
//after 3 seconds this will be called,
//once this is called take picture or whatever function you need to do
takeScreenshot();
});
And if you want,use this code below to take screenshot as mentioned in this answer Take Screenshot Stackoverflow answer
takeScreenShot() async{
RenderRepaintBoundary boundary =
previewContainer.currentContext.findRenderObject();
ui.Image image = await boundary.toImage();
final directory = (await getApplicationDocumentsDirectory()).path;
ByteData byteData = await image.toByteData(format: ui.ImageByteFormat.png);
Uint8List pngBytes = byteData.buffer.asUint8List();
print(pngBytes);
File imgFile =new File('$directory/screenshot.png');
imgFile.writeAsBytes(pngBytes);
}
Hope this helps!
I want to take a photo with the image_picker library that stores the file on the phone sd card.
I want to then load this image so that i can draw it with a CustomPaint widget by drawing the image on the canvas.
I have tried to load the image with both FileImage and Image.file
but this doesn't work because the 'Image' in the CustomPaint extends NativeFieldWrapperClass2 and isn't an Image widget
Is there anyone who knows how to load a photo and draw it on a canvas?
You need the ui package version of Image (as distinct from the widget called Image)
Import the ui package, and create a method to return the ui.Image:
import 'dart:ui' as ui;
Future<ui.Image> load(String filename) async {
var file = File(filename);
var bytes = await file.readAsBytes();
var codec = await ui.instantiateImageCodec(bytes);
var fi = await codec.getNextFrame();
return fi.image;
}
Use ui.Image to draw. You may need a transform to shrink it.