How to convert Image to File in Flutter?
16,652
Solution 1
Special thanks to sami kanafani.
This is my solution (works perfectly for me):
import 'dart:async';
import 'dart:io';
import 'package:flutter/services.dart';
import 'package:path_provider/path_provider.dart';
class ImageUtils {
static Future<File> imageToFile({String imageName, String ext}) async {
var bytes = await rootBundle.load('assets/$imageName.$ext');
String tempPath = (await getTemporaryDirectory()).path;
File file = File('$tempPath/profile.png');
await file.writeAsBytes(
bytes.buffer.asUint8List(bytes.offsetInBytes, bytes.lengthInBytes));
return file;
}
}
class AnotherClass {
File imagePlaceHolder;
_setPlaceHolder() async {
this.imagePlaceHolder = await ImageUtils.imageToFile(
imageName: "photo_placeholder", ext: "jpg");
}
...
Image.file(this.imagePlaceHolder),
}
Solution 2
I had the exact same issue, and used this guide: https://medium.com/@mrgulshanyadav/convert-image-url-to-file-format-in-flutter-10421bccfd18 (written by Gulshan Yadav)
Using these imports:
import 'package:http/http.dart' as http;
import 'package:path_provider/path_provider.dart';
import 'dart:io';
import 'dart:math';
And this function:
Future<File> urlToFile(String imageUrl) async {
// generate random number.
var rng = new Random();
// get temporary directory of device.
Directory tempDir = await getTemporaryDirectory();
// get temporary path from temporary directory.
String tempPath = tempDir.path;
// create a new file in temporary path with random file name.
File file = new File('$tempPath'+ (rng.nextInt(100)).toString() +'.png');
// call http.get method and pass imageUrl into it to get response.
http.Response response = await http.get(imageUrl);
// write bodyBytes received in response to file.
await file.writeAsBytes(response.bodyBytes);
// now return the file which is created with random name in
// temporary directory and image bytes from response is written to // that file.
return file;
}
Comments
-
Jayant Jeet Tomar almost 2 years
I am writing this flutter code where I have Image in an Image widget and I want to convert it into File so that I can upload it to Firebase Storage.
Image _image = Image.asset('assets\images\profile.png'); File _fileImage = convertToFile(_image); //upload _fileImage to Firebase Storage code
I need the
File convertToFile(Image img)
function.