Flutter Making an Image.file() image into an ImageProvider() for zoomable photos

Question

I've created an app that downloads a bunch of information for off-line use, much of which are photos. In the app, I'd like to use a widget that allows me to have a pan/zoom effect, but the ones I've found don't seem to play well with Image.file() and instead use ImageProviders.

For example, Photo_View only accepts AssetImage, and NetworkImage images which both inherit from ImageProvider, while Image.file() inherits from Diagnosticable. All of the packages that I've seen operate in basically the same way.

So, my question is how to convert Image.file() data into a ImageProvider format.

Blasanka · Accepted Answer · 2020-01-09 01:51:30Z

16

Instead of Image.file() use FileImage() that is type of ImageProvider.

From Doc:

Decodes the given File object as an image, associating it with the given scale.

See also:

Image.file for a shorthand of an Image widget backed by FileImage.

I think you can also use ExactAssetImage with Image File path(ex: image.path) but it should be in AssetBundle. Here what doc says about that:

ExactAssetImage class

Fetches an image from an AssetBundle, associating it with the given scale.

This implementation requires an explicit final assetName and scale on construction, and ignores the device pixel ratio and size in the configuration passed into resolve. For a resolution-aware variant that uses the configuration to pick an appropriate image based on the device pixel ratio and size, see AssetImage.

1 Comment

William Terrill Over a year ago

I don't think that ExactAssetImage would work in this case, since it seems like it only works with images that are bundled with the app, and not files that have been downloaded. HOWEVER, FileImage() worked like a charm. Thank you!

Himanshu Meel · Accepted Answer · 2020-08-28 03:53:47Z

3

First import dart:io; then use

PhotoView(imageProvider: FileImage(File(path)))

edited Aug 28, 2020 at 3:53

answered Aug 26, 2020 at 13:08

Himanshu Meel

312 bronze badges

Comments

Sunil Gupta · Accepted Answer · 2022-02-17 11:36:58Z

2

This is what worked for me:

import 'dart:io' as io;

FileImage(io.File(_imageFile!.path)) as ImageProvider

where _imageFile is an XFile

answered Feb 17, 2022 at 11:36

Sunil Gupta

84210 silver badges26 bronze badges

Comments

saigopi.me · Accepted Answer · 2022-07-13 00:33:00Z

0

Use FileImage(File(imagePath)) widget for showing file image with ImageProvider.

answered Jul 13, 2022 at 0:33

saigopi.me

15.1k3 gold badges89 silver badges57 bronze badges

Collectives™ on Stack Overflow

Flutter Making an Image.file() image into an ImageProvider() for zoomable photos

4 Answers 4

1 Comment

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

4 Answers 4

1 Comment

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related