Eseguire screenshot in Flutter

In Flutter possiamo eseguire screenshot delle nostre app/widget usando il package screenshot!

È compatibile con tutte le piattaforme; testata su Android e Linux.

In questo articolo vediamo un esempio.

Partiamo dall'installazione:

flutter pub add screenshot

Qui sotto un pò di codice:

import 'dart:typed_data';

import 'package:flutter/material.dart';
import 'package:screenshot/screenshot.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key});

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final ScreenshotController _screenshotController = ScreenshotController();

  @override
  void initState() {
    super.initState();
  }

  Future<dynamic> _showCapturedWidget(
      BuildContext context, Uint8List capturedImage) {
    return showDialog(
      useSafeArea: false,
      context: context,
      builder: (context) => Scaffold(
        appBar: AppBar(
          title: const Text("Schermata con lo screenshot"),
        ),
        body: Center(
          child: Image.memory(capturedImage),
        ),
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: const Text('Flutter test'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Screenshot(
              controller: _screenshotController,
              child: Container(
                padding: const EdgeInsets.all(30.0),
                decoration: BoxDecoration(
                  border: Border.all(color: Colors.blueAccent, width: 5.0),
                  color: Colors.amberAccent,
                ),
                child: const Stack(
                  children: [
                    Text("Questo è il widget che verrà catturato"),
                  ],
                ),
              ),
            ),
            const SizedBox(
              height: 25,
            ),
            ElevatedButton(
              child: const Text(
                'Cattura!',
              ),
              onPressed: () {
                _screenshotController
                    .capture(delay: const Duration(milliseconds: 10))
                    .then((capturedImage) async {
                  _showCapturedWidget(context, capturedImage!);
                }).catchError((onError) {
                  print(onError);
                });
              },
            ),
          ],
        ),
      ),
    );
  }
}

Questo eseguirà lo screenshot di un widget e poi lo mostrerà in una schermata a parte.

Enjoy!