adv_image_picker 2.0.2

An advanced image picker with our custom UI, depend on AdvCamera (Custom camera with focus and zoom functionality) and ImageList (A native image list view to render image optimally).

example/lib/main.dart

import 'dart:async';
import 'dart:io';
import 'dart:typed_data';

import 'package:adv_image_picker/adv_image_picker.dart';
import 'package:adv_image_picker/plugins/adv_image_picker_plugin.dart';
import 'package:flutter/material.dart';

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

class CustomImageCache extends WidgetsFlutterBinding {
  @override
  ImageCache createImageCache() {
    ImageCache imageCache = super.createImageCache();
    // Set your image cache size
    imageCache.maximumSize = 10;
    return imageCache;
  }
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Image Picker Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  List<File> files = [];
  List<ImageProvider> thumbnails = [];
  bool isPreparing = false;

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

    AdvImagePicker.cameraFolderName = "Camera Folder";
    AdvImagePicker.cameraFilePrefixName = "CameraTestingPrefixName_";
    AdvImagePicker.cameraSavePath = "/storage/emulated/0/CameraTestingFolder/";
  }

  @override
  void dispose() {
    //flushing every memory that was taken before
    if ((thumbnails?.length ?? 0) > 0) {
      for (ImageProvider each in thumbnails) {
        each.evict();
      }
    }

    super.dispose();
  }

  void _pickImage() async {
    files.addAll(await AdvImagePicker.pickImagesToFile(context, maxSize: 4080));
    print("files => ${files.map((e) => e.path).join("\n")}");
    prepare();
  }

  Future<void> prepare() async {
    List<ImageProvider> thumbnails = [];
    double screenWidth = MediaQuery.of(context).size.width;

    for (int i = 0; i < files.length; i++) {
      String path = files[i].path;
      ByteData data = await AdvImagePickerPlugin.getAlbumThumbnail(
        imagePath: path,
        height: screenWidth ~/ 4,
        width: screenWidth ~/ 4,
      );

      Uint8List imageData = data.buffer.asUint8List();

      thumbnails.add(MemoryImage(imageData));
    }

    this.thumbnails = List<ImageProvider>.from(thumbnails);

    if (this.mounted) setState(() {});
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: isPreparing ? CircularProgressIndicator() : GridView.count(
          crossAxisCount: 4,
          children: thumbnails
              .map((ImageProvider image) => Image(
                    image: image,
                    fit: BoxFit.cover,
                  ))
              .toList(),
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _pickImage,
        child: Icon(Icons.add),
      ),
    );
  }
}