multimage_picker/example/lib/asset_view.dart

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

class AssetView extends StatefulWidget {
  final int _index;
  final Asset _asset;

  AssetView(
    this._index,
    this._asset, {
    Key key,
  }) : super(key: key);

  @override
  State<StatefulWidget> createState() => AssetState(this._index, this._asset);
}

class AssetState extends State<AssetView> {
  int _index = 0;
  Asset _asset;
  AssetState(this._index, this._asset);

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

  void _loadImage() async {
    await this._asset.requestThumbnail(300, 300, quality: 50);

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

  @override
  Widget build(BuildContext context) {
    if (null != this._asset.thumbData) {
      return Image.memory(
        this._asset.,
        fit: BoxFit.cover,
        gaplessPlayback: true,
      );
    }

    return Text(
      '${this._index}',
      style: Theme.of(context).textTheme.headline,
    );
  }
}