Select Image from Gallery Using Image Picker plugin in flutter

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A Flutter plugin for iOS and Android for picking images from the image library, and taking new pictures with the camera.

Installation #

First, add image_picker: ^0.6.3+1 as a dependency in your pubspec.yaml file.

iOS #

Add the following keys to your Info.plist file, located in <project root>/ios/Runner/Info.plist:
  • NSPhotoLibraryUsageDescription - describe why your app needs permission for the photo library. This is called Privacy - Photo Library Usage Description in the visual editor.
  • NSCameraUsageDescription - describe why your app needs access to the camera. This is called Privacy - Camera Usage Description in the visual editor.
  • NSMicrophoneUsageDescription - describe why your app needs access to the microphone, if you intend to record videos. This is called Privacy - Microphone Usage Description in the visual editor.

Android #

No configuration required - the plugin should work out of the box.

Example:-

import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import 'dart:io';
class PickImageDemo extends StatefulWidget {
  PickImageDemo() : super();
  final String title = "Flutter Pick Image demo";
  @override
  _PickImageDemoState createState() => _PickImageDemoState();
}
class _PickImageDemoState extends State<PickImageDemo> {
  Future<File> imageFile;
  pickImageFromGallery(ImageSource source) {
    setState(() {
      imageFile = ImagePicker.pickImage(source: source);
    });
  }
  Widget showImage() {
    return FutureBuilder<File>(
      future: imageFile,
      builder: (BuildContext context, AsyncSnapshot<File> snapshot) {
        if (snapshot.connectionState == ConnectionState.done &&
            snapshot.data != null) {
          return Image.file(
            snapshot.data,
            width: 300,
            height: 300,
          );
        } else if (snapshot.error != null) {
          return const Text(
            'Error Picking Image',
            textAlign: TextAlign.center,
          );
        } else {
          return const Text(
            'No Image Selected',
            textAlign: TextAlign.center,
          );
        }
      },
    );
  }
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            showImage(),
            RaisedButton(
              child: Text("Select Image from Gallery"),
              onPressed: () {
                pickImageFromGallery(ImageSource.gallery);
              },
            ),
          ],
        ),
      ),
    );
  }
}

Handling MainActivity destruction on Android #
Android system -- although very rarely -- sometimes kills the MainActivity after the image_picker finishes. When this happens, we lost the data selected from the image_picker. You can use retrieveLostData to retrieve the lost data in this situation. For example:
Future<void> retrieveLostData() async {
  final LostDataResponse response =
      await ImagePicker.retrieveLostData();
  if (response == null) {
    return;
  }
  if (response.file != null) {
    setState(() {
      if (response.type == RetrieveType.video) {
        _handleVideo(response.file);
      } else {
        _handleImage(response.file);
      }
    });
  } else {
    _handleError(response.exception);
  }
}

There's no way to detect when this happens, so calling this method at the right place is essential.
Flutter is Google’s UI toolkit for building beautiful, natively compiled applications for mobile, web, and desktop from a single codebase.

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