dotLottieLoader for Flutter

dotLottieLoader is a library to help downloading and deflating a .lottie file, giving access to the animation, as well as the assets included in the bundle. This repository is an unofficial conversion of the dotottieloader-android library in pure Dart.

It works on Android, iOS, macOS, linux, windows and web.

Install

flutter pub add dotlottie_loader

Also install lottie package to render the animations.

Usage

loading from app assets

 DotLottieLoader.fromAsset("assets/anim2.lottie",
                  frameBuilder: (BuildContext ctx, DotLottie? dotlottie) {
                if (dotlottie != null) {
                  return Lottie.memory(dotlottie.animations.values.single);
                } else {
                  return Container();
                }
              }),

loading from network

 DotLottieLoader.fromNetwork(
                "https://github.com/sartajroshan/dotlottieloader-flutter/raw/master/example/assets/animation.lottie",
                frameBuilder: (ctx, dotlottie) {
                  if (dotlottie != null) {
                    return Lottie.memory(dotlottie!.animations.values.single);
                  } else {
                    return Container();
                  }
                },
                errorBuilder: (ctx, e, s) {
                  print(s);
                  return Text(e.toString());
                },
              ),

loading with images

 DotLottieLoader.fromAsset(
          "assets/animation_external_image.lottie",
          frameBuilder: (ctx, dotlottie) {
            if (dotlottie != null) {
                return Lottie.memory(dotlottie.animations.values.single,
                        imageProviderFactory: (asset) {
                          return MemoryImage(dotlottie.images[asset.fileName]!);
                        },
                      );
            } else {
              return Container();
            }
          },
 )

DotLottie data

class ManifestAnimation {
   String id;
  double speed;
  String? themeColor;
  bool loop;

  ManifestAnimation(this.id, this.speed, this.themeColor, this.loop);
}

class Manifest {
  String? generator, author;
  int? revision;
  String? version;
  late List<ManifestAnimation> animations;
  Map<String, dynamic>? custom;

  Manifest(this.generator, this.author, this.revision, this.version,
      this.animations, this.custom);
}

class DotLottie {
  Manifest? manifest;
  Map<String, Uint8List> animations;
  Map<String, Uint8List> images;

  DotLottie(this.manifest, this.animations, this.images);
}