network_to_file_image 2.3.2

Opens a local image file, if it exists there. If it doesn't, fetches the image from the network and then saves to the local file for next time.

example/lib/main.dart

import 'dart:io';
import 'package:flutter/material.dart';
import 'package:network_to_file_image/network_to_file_image.dart';
import 'package:path/path.dart' as p;
import 'package:path_provider/path_provider.dart';

Directory _appDocsDir;

void main() async {
  // You should get the Application Documents Directory only once.
  WidgetsFlutterBinding.ensureInitialized();
  _appDocsDir = await getApplicationDocumentsDirectory();

  runApp(MaterialApp(home: Demo()));
}

File fileFromDocsDir(String filename) {
  String pathName = p.join(_appDocsDir.path, filename);
  return File(pathName);
}

class Demo extends StatelessWidget {
  @override
  Widget build(BuildContext context) => Scaffold(
        appBar: AppBar(title: const Text('NetworkToFileImage example')),
        body: Padding(
          padding: const EdgeInsets.all(30.0),
          child: Image(
            image: NetworkToFileImage(
              url: "https://upload.wikimedia.org/wikipedia/commons/1/17/Google-flutter-logo.png",
              file: fileFromDocsDir("flutter.png"),
              debug: true,
            ),
          ),
        ),
      );
}