Flutter : Image Picker Tutorial | Pick single image from Gallery

Introduction

In this tutorial, we will create an image picker and display the content on the screen. Image Picker picks a file from the Storage or Camera and stores it in an XFile object.

Implementation

Install dependency

We will first need the image_picker dependency.

To install it, add the following dependency to pubspec.yaml file.

image_picker: ^0.8.4+3

Save and run pubspec.yaml file

Example

Import the dependency in your dart file.

import 'package:image_picker/image_picker.dart';

Syntax

Image picking is a future task. So we need to await the image picking. Here is the syntax.

await _picker.pickImage(source: ImageSource.gallery);

Here we have provided the source from the gallery. We can also provide the source as a Camera using the following syntax.

await _picker.pickImage(source: ImageSource.camera);

Also, the image is stored in a file type of Xfile. Later we modify it to a convenient file type of our choice. In our example, we will store it in a File object and then display it using the Image.file() widget.

final XFile? image = await _picker.pickImage(source: ImageSource.gallery);

Demo

Here is a demo code. In this code, when the user presses the button, the image picker opens the Gallery. Then if we choose an image, it will display the image on the screen. Else it will be blank as previously.

import 'dart:io';

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

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

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  // This widget is the root of your application.@override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'All About Flutter',
      theme: ThemeData(
        primarySwatch: Colors.deepOrange,
      ),
      home: const ImagePickerTutorial(),
    );
  }
}

class ImagePickerTutorial extends StatefulWidget {
  const ImagePickerTutorial({Key? key}) : super(key: key);

  @override
  _ImagePickerTutorialState createState() => _ImagePickerTutorialState();
}

class _ImagePickerTutorialState extends State<ImagePickerTutorial> {
  File? pickedImage;
  bool isPicked = false;
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text("Image Picker"),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.spaceBetween,
          children: [
            Expanded(
              child: Container(
                child: isPicked
                    ? Image.file(
                        pickedImage!,
                        width: MediaQuery.of(context).size.width,
                        height: MediaQuery.of(context).size.width * (4 / 3),
                      )
                    : Container(
                        color: Colors.blueGrey[100],
                        width: MediaQuery.of(context).size.width,
                        height: MediaQuery.of(context).size.width * (4 / 3),
                      ),
              ),
            ),
            Padding(
              padding: const EdgeInsets.all(48.0),
              child: ElevatedButton(
                onPressed: () async {
                  final ImagePicker _picker = ImagePicker();
                  final XFile? image =
                      await _picker.pickImage(source: ImageSource.gallery);
                  if (image != null) {
                    pickedImage = File(image.path);
                    setState(() {
                      isPicked = true;
                    });
                  }
                },
                child: const Text("Pick Image"),
              ),
            ),
          ],
        ),
      ),
    );
  }
}

Output

Summary

• We learned to pick an image in Flutter

• Used image_picker plugin.