...

This PR improves some fill performance issues I found with various Lottie animations.
I think the real issue comes down to the render performance of Path.addPath(). The performance issue happens in the Render thread and seems directly related to how large the animation is on-screen. Flutter might be caching pre-rendered textures and running out of memory.

I've changed how Path.addPath() is called and how the path is rendered for fill_content.dart and gradient_fill_content.dart.

Just as an example, the example/assets/Tests/bm.json animation gets ~60 fps with this fix, compared to 34-52 fps with the lottie-flutter 0.6.0 release. (This is on a Pixel 3 XL)

There are a couple of other changes:

- I fixed a bug with the casing of "weather" in pubspec.yaml. Without this fix, the examples don't build on Ubuntu Linux.
The debugging class MeanCalculator wasn't initializing its fields, causing a null pointer exception when debugging.
- I added antiAliasingSuggested to LottieDrawable to allow fill paints to be anti-aliased. It is off by default. It also provides some minor performance improvements without any noticeable loss in quality. It is only applied to fills right now.
- I added PathFactory to create Paths rather than just new-ing them. path_factory.dart allows you to switch out the normal Path creation with a debug logging implementation so you can see all of the Path calls that are performed during a frame. Just create a DebugPath in the factory rather than Path.

.github/workflows/analyze-and-test.yaml

@@ -0,0 +1,35 @@
+name: Lottie Flutter
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+
+jobs:
+  analyze_and_test:
+    name: Flutter analyze
+    strategy:
+      matrix:
+        flutter: ['beta']
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: subosito/flutter-action@v1
+        with:
+          channel: ${{ matrix.flutter }}
+      - run: flutter doctor
+      - run: flutter --version
+      - run: flutter pub get
+        working-directory: example
+      - run: flutter analyze
+      - run: flutter test test # https://github.com/flutter/flutter/issues/20907
+      - run: flutter test test
+        working-directory: example
+      - run: flutter pub run tool/prepare_submit.dart
+      - name: "check for uncommitted changes"
+        run: |
+          git diff --exit-code --stat -- . ':(exclude)*pubspec.lock' \
+          || (echo "##[error] found changed files after build. please run 'dart tool/prepare_submit.dart'" \
+                   "and check in all changes" \
+              && exit 1)
+        shell: bash

.github/workflows/publish-on-pub.yaml

@@ -0,0 +1,32 @@
+name: Publish package to pub.dev
+on:
+  push:
+#    tags:
+#      - v*
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: subosito/flutter-action@v1
+        with:
+          channel: 'beta'
+      - run: flutter pub get
+      - run: flutter pub run tool/publish/comment_dependency_overrides.dart
+      - run: flutter pub get
+      - run: echo ${GITHUB_REF}
+      - run: flutter pub run tool/publish/check_version.dart ${GITHUB_REF}
+#      - name: Setup credentials
+#        run: |
+#          mkdir -p $FLUTTER_HOME/.pub-cache
+#          cat <<EOF > $FLUTTER_HOME/.pub-cache/credentials.json
+#          {
+#            "accessToken":"${{ secrets.OAUTH_ACCESS_TOKEN }}",
+#            "refreshToken":"${{ secrets.OAUTH_REFRESH_TOKEN }}",
+#            "tokenEndpoint":"https://accounts.google.com/o/oauth2/token",
+#            "scopes": [ "openid", "https://www.googleapis.com/auth/userinfo.email" ],
+#            "expiration": 1580681402856
+#          }
+#          EOF
+#      - name: Publish package
+#        run: flutter pub publish --force

.gitignore

@@ -0,0 +1,11 @@
+.*
+_*
+
+!.gitignore
+!.github
+
+**/failures/*.png
+
+*.iml
+**/doc/api/
+build/

.metadata

@@ -0,0 +1,10 @@
+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: 27321ebbad34b0a3fafe99fac037102196d655ff
+  channel: stable
+
+project_type: package

CHANGELOG.md

@@ -0,0 +1,105 @@
+## [0.7.1]
+- Fix a crash for some lottie file with empty paths.
+
+## [0.7.0+1]
+- Fix Flutter Web compilation error
+
+## [0.7.0]
+- Performance improvement for complex animations.
+
+## [0.6.0]
+- Runs the animation at the frame rate specified in the json file (ie. An animation encoded with a 20 FPS will only
+  be paint 20 times per seconds even though the AnimationController will invalidate the widget 60 times per seconds).  
+  A new property `frameRate` allows to opt-out this behavior and have the widget to repaint at the device frame rate 
+   (`FrameRate.max`).
+- Automatically add a `RepaintBoundary` around the widget. Since `Lottie` animations are generally complex to paint, a
+   `RepaintBoundary` will separate the animation with the rest of the app and improve performance. A new property `addRepaintBoundary`
+   allows to opt-out this behavior.
+- Fix a bug where we would call `markNeedPaint` when the animation was not changing. This removes unnecessary paints in
+  animations with static periods.
+
+## [0.5.1]
+- Remove direct dependencies on dart:io to support Flutter Web
+
+## [0.5.0]
+- Support loading animation from network in a web app
+- Fix a couple of bugs with the web dev compiler
+
+## [0.4.1]
+- Support color value stored as RGB, not RGBA 
+
+## [0.4.0+1]
+- Support latest version of the `characters` package
+
+## [0.4.0]
+- Disable "Merge paths" by default and provide an option to enable them.  
+This is the same behavior as in Lottie-android.  
+Merge paths currently don't work if the the operand shape is entirely contained within the
+first shape. If you need to cut out one shape from another shape, use an even-odd fill type
+instead of using merge paths.
+
+Merge paths can be enabled with:
+```dart
+Lottie.asset('file.json', options: LottieOptions(enableMergePaths: true));
+```
+
+
+## [0.3.6]
+- Export the `Marker` class
+
+## [0.3.5]
+- Fix a bug with a wrongly clipped rectangle. 
+
+## [0.3.4]
+- Fix a bug with dashed path
+
+## [0.3.3]
+- Fix a bug with rounded rectangle shape
+
+## [0.3.2]
+- Fix a bug with "repeater" content
+
+## [0.3.1]
+- Support dashed path
+
+## [0.3.0+1]
+- Specify a version range for the dependency on `characters`.
+
+## [0.3.0]
+- Add `LottieDelegates` a group of options to customize the lottie animation at runtime.
+  ie: Dynamically modify color, position, size, text... of every elements of the animation.
+- Correctly display Linear and Radial Gradients
+- Integrate latest changes from Lottie-android
+
+## [0.2.2]
+- Add a [repeat] parameter to specify if the automatic animation should loop.
+- Add the [animate], [reverse], [repeat] properties on `LottieBuilder`
+- Fix bug with `onLoaded` callback when the `LottieProvider` is changed
+
+## [0.2.1]
+- Fix a big bug in the path transformation code. A lot more animations look correct now.
+
+## [0.2.0+1]
+- Improve readme
+- (internal) Add golden tests
+
+## [0.2.0]
+- Support loading the animation and its images from a zip file
+- Breaking: `LottieComposition.fromBytes` and `fromByteData` are now asynchronous.
+
+## [0.1.4]
+- Support images in animation
+- Basic support for text in animation (work in progress)
+
+## [0.1.3]
+- Support Polystar shape
+- Reorganize examples.
+
+## [0.1.2]
+- Implement `Lottie.network`, `Lottie.file` and `Lottie.memory`
+
+## [0.1.1]
+- Fix analysis lints
+
+## [0.1.0]
+- Initial conversion of [lottie-android](https://github.com/airbnb/lottie-android) to Dart/Flutter

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) [year] [fullname]
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -0,0 +1,258 @@
+# Lottie for Flutter
+
+[![](https://github.com/xvrh/lottie-flutter/workflows/Lottie%20Flutter/badge.svg?branch=master)](https://github.com/xvrh/lottie-flutter)
+[![pub package](https://img.shields.io/pub/v/lottie.svg)](https://pub.dev/packages/lottie)
+
+Lottie is a mobile library for Android and iOS that parses [Adobe After Effects](https://www.adobe.com/products/aftereffects.html) 
+animations exported as json with [Bodymovin](https://github.com/airbnb/lottie-web) and renders them natively on mobile!
+
+This repository is a unofficial conversion of the [Lottie-android](https://github.com/airbnb/lottie-android) library in pure Dart. 
+
+It works on Android, iOS, macOS, linux, windows and web.
+
+## Usage
+
+### Simple animation
+This example shows how to display a Lottie animation in the simplest way.  
+The `Lottie` widget will load the json file and run the animation indefinitely.
+
+```dart
+import 'package:flutter/material.dart';
+import 'package:lottie/lottie.dart';
+
+void main() => runApp(MyApp());
+
+class MyApp extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      home: Scaffold(
+        body: ListView(
+          children: [
+            // Load a Lottie file from your assets
+            Lottie.asset('assets/LottieLogo1.json'),
+
+            // Load a Lottie file from a remote url
+            Lottie.network(
+                'https://raw.githubusercontent.com/xvrh/lottie-flutter/master/example/assets/Mobilo/A.json'),
+
+            // Load an animation and its images from a zip file
+            Lottie.asset('assets/lottiefiles/angel.zip'),
+          ],
+        ),
+      ),
+    );
+  }
+}
+```
+
+### Specify a custom `AnimationController`
+This example shows how to take full control over the animation by providing your own `AnimationController`.
+
+With a custom `AnimationController` you have a rich API to play the animation in various ways: start and stop the animation when you want,
+ play forward or backward, loop between specifics points...  
+
+```dart
+import 'package:flutter/material.dart';
+import 'package:lottie/lottie.dart';
+
+void main() => runApp(MyApp());
+
+class MyApp extends StatefulWidget {
+  @override
+  _MyAppState createState() => _MyAppState();
+}
+
+class _MyAppState extends State<MyApp> with TickerProviderStateMixin {
+  late final AnimationController _controller;
+
+  @override
+  void initState() {
+    super.initState();
+
+    _controller = AnimationController(vsync: this);
+  }
+
+  @override
+  void dispose() {
+    _controller.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      home: Scaffold(
+        body: ListView(
+          children: [
+            Lottie.asset(
+              'assets/LottieLogo1.json',
+              controller: _controller,
+              onLoaded: (composition) {
+                // Configure the AnimationController with the duration of the
+                // Lottie file and start the animation.
+                _controller
+                  ..duration = composition.duration
+                  ..forward();
+              },
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}
+```
+
+[See this file](https://github.com/xvrh/lottie-flutter/blob/master/example/lib/examples/animation_full_control.dart) for a more comprehensive example.
+
+### Control the size of the Widget
+The `Lottie` widget takes the same arguments and have the same behavior as the `Image` widget
+in term of controlling its size.
+```dart
+Lottie.asset(
+  'assets/LottieLogo1.json',
+  width: 200,
+  height: 200,
+  fit: BoxFit.fill,
+)
+```
+
+`width` and `height` are optionals and fallback on the size imposed by the parent or on the intrinsic size of the lottie 
+animation.
+
+### Custom loading
+The `Lottie` widget has several convenient constructors (`Lottie.asset`, `Lottie.network`, `Lottie.memory`) to load, parse and
+cache automatically the json file.
+
+Sometime you may prefer to have full control over the loading of the file. Use `LottieComposition.fromByteData` to 
+parse the file from a list of bytes.
+
+This example shows how to load and parse a Lottie composition from a json file.  
+
+```dart
+class MyWidget extends StatefulWidget {
+  @override
+  _MyWidgetState createState() => _MyWidgetState();
+}
+
+class _MyWidgetState extends State<MyWidget> {
+  late final Future<LottieComposition> _composition;
+
+  @override
+  void initState() {
+    super.initState();
+
+    _composition = _loadComposition();
+  }
+
+  Future<LottieComposition> _loadComposition() async {
+    var assetData = await rootBundle.load('assets/LottieLogo1.json');
+    return await LottieComposition.fromByteData(assetData);
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return FutureBuilder<LottieComposition>(
+      future: _composition,
+      builder: (context, snapshot) {
+        var composition = snapshot.data;
+        if (composition != null) {
+          return Lottie(composition: composition);
+        } else {
+          return Center(child: CircularProgressIndicator());
+        }
+      },
+    );
+  }
+}
+```
+
+### Custom drawing
+This example goes low level and shows you how to draw a `LottieComposition` on a custom Canvas at a specific frame in 
+a specific position and size.
+
+````dart
+class CustomDrawer extends StatelessWidget {
+  final LottieComposition composition;
+
+  const CustomDrawer(this.composition, {Key? key}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return CustomPaint(
+      painter: _Painter(composition),
+      size: Size(400, 400),
+    );
+  }
+}
+
+class _Painter extends CustomPainter {
+  final LottieDrawable drawable;
+
+  _Painter(LottieComposition composition)
+      : drawable = LottieDrawable(composition);
+
+  @override
+  void paint(Canvas canvas, Size size) {
+    var frameCount = 40;
+    var columns = 10;
+    for (var i = 0; i < frameCount; i++) {
+      var destRect = Offset(i % columns * 50.0, i ~/ 10 * 80.0) & (size / 5);
+      drawable
+        ..setProgress(i / frameCount)
+        ..draw(canvas, destRect);
+    }
+  }
+
+  @override
+  bool shouldRepaint(CustomPainter oldDelegate) {
+    return true;
+  }
+}
+````
+
+### Modify properties at runtime
+This example shows how to modify some properties of the animation at runtime. Here we change the text,
+the color, the opacity and the position of some layers.
+For each `ValueDelegate` we can either provide a static `value` or a `callback` to compute a value for a each frame.
+
+````dart
+class _Animation extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return Lottie.asset(
+      'assets/Tests/Shapes.json',
+      delegates: LottieDelegates(
+        text: (initialText) => '**$initialText**',
+        values: [
+          ValueDelegate.color(
+            const ['Shape Layer 1', 'Rectangle', 'Fill 1'],
+            value: Colors.red,
+          ),
+          ValueDelegate.opacity(
+            const ['Shape Layer 1', 'Rectangle'],
+            callback: (frameInfo) => (frameInfo.overallProgress * 100).round(),
+          ),
+          ValueDelegate.position(
+            const ['Shape Layer 1', 'Rectangle', '**'],
+            relative: Offset(100, 200),
+          ),
+        ],
+      ),
+    );
+  }
+}
+````
+
+## Limitations
+Only the [supported features of Lottie Android](https://airbnb.io/lottie/#/supported-features)
+are supported in this port.
+
+## Flutter Web
+Run the app with `flutter run -d Chrome --dart-define=FLUTTER_WEB_USE_SKIA=true --release`
+
+See a preview here: https://xvrh.github.io/lottie-flutter/index.html
+
+## More examples
+See the `example` folder for more code samples of the various possibilities.

README.template.md

@@ -0,0 +1,90 @@
+# Lottie for Flutter
+
+[![](https://github.com/xvrh/lottie-flutter/workflows/Lottie%20Flutter/badge.svg?branch=master)](https://github.com/xvrh/lottie-flutter)
+[![pub package](https://img.shields.io/pub/v/lottie.svg)](https://pub.dev/packages/lottie)
+
+Lottie is a mobile library for Android and iOS that parses [Adobe After Effects](https://www.adobe.com/products/aftereffects.html) 
+animations exported as json with [Bodymovin](https://github.com/airbnb/lottie-web) and renders them natively on mobile!
+
+This repository is a unofficial conversion of the [Lottie-android](https://github.com/airbnb/lottie-android) library in pure Dart. 
+
+It works on Android, iOS, macOS, linux, windows and web.
+
+## Usage
+
+### Simple animation
+This example shows how to display a Lottie animation in the simplest way.  
+The `Lottie` widget will load the json file and run the animation indefinitely.
+
+```dart
+import 'example/lib/main.dart';
+```
+
+### Specify a custom `AnimationController`
+This example shows how to take full control over the animation by providing your own `AnimationController`.
+
+With a custom `AnimationController` you have a rich API to play the animation in various ways: start and stop the animation when you want,
+ play forward or backward, loop between specifics points...  
+
+```dart
+import 'example/lib/examples/animation_controller.dart';
+```
+
+[See this file](https://github.com/xvrh/lottie-flutter/blob/master/example/lib/examples/animation_full_control.dart) for a more comprehensive example.
+
+### Control the size of the Widget
+The `Lottie` widget takes the same arguments and have the same behavior as the `Image` widget
+in term of controlling its size.
+```dart
+Lottie.asset(
+  'assets/LottieLogo1.json',
+  width: 200,
+  height: 200,
+  fit: BoxFit.fill,
+)
+```
+
+`width` and `height` are optionals and fallback on the size imposed by the parent or on the intrinsic size of the lottie 
+animation.
+
+### Custom loading
+The `Lottie` widget has several convenient constructors (`Lottie.asset`, `Lottie.network`, `Lottie.memory`) to load, parse and
+cache automatically the json file.
+
+Sometime you may prefer to have full control over the loading of the file. Use `LottieComposition.fromByteData` to 
+parse the file from a list of bytes.
+
+This example shows how to load and parse a Lottie composition from a json file.  
+
+```dart
+import 'example/lib/examples/custom_load.dart#example';
+```
+
+### Custom drawing
+This example goes low level and shows you how to draw a `LottieComposition` on a custom Canvas at a specific frame in 
+a specific position and size.
+
+````dart
+import 'example/lib/examples/custom_draw.dart#example';
+````
+
+### Modify properties at runtime
+This example shows how to modify some properties of the animation at runtime. Here we change the text,
+the color, the opacity and the position of some layers.
+For each `ValueDelegate` we can either provide a static `value` or a `callback` to compute a value for a each frame.
+
+````dart
+import 'example/lib/examples/simple_dynamic_properties.dart#example';
+````
+
+## Limitations
+Only the [supported features of Lottie Android](https://airbnb.io/lottie/#/supported-features)
+are supported in this port.
+
+## Flutter Web
+Run the app with `flutter run -d Chrome --dart-define=FLUTTER_WEB_USE_SKIA=true --release`
+
+See a preview here: https://xvrh.github.io/lottie-flutter/index.html
+
+## More examples
+See the `example` folder for more code samples of the various possibilities.

analysis_options.yaml

@@ -0,0 +1,39 @@
+include: package:pedantic/analysis_options.yaml
+analyzer:
+  errors:
+  strong-mode:
+    implicit-casts: false
+    implicit-dynamic: false
+linter:
+  rules:
+    avoid_renaming_method_parameters: true
+    avoid_returning_null_for_future: true
+    avoid_returning_null_for_void: true
+    avoid_returning_this: true
+    avoid_setters_without_getters: true
+    await_only_futures: true
+    camel_case_types: true
+    cancel_subscriptions: true
+    close_sinks: true
+    constant_identifier_names: true
+    empty_statements: true
+    hash_and_equals: true
+    iterable_contains_unrelated_type: true
+    list_remove_unrelated_type: true
+    no_adjacent_strings_in_list: true
+    non_constant_identifier_names: true
+    only_throw_errors: true
+    overridden_fields: true
+    prefer_inlined_adds: true
+    prefer_interpolation_to_compose_strings: true
+    prefer_null_aware_operators: true
+    prefer_relative_imports: true
+    prefer_typing_uninitialized_variables: true
+    sort_pub_dependencies: true
+    test_types_in_equals: true
+    unnecessary_brace_in_string_interps: true
+    unnecessary_getters_setters: true
+    unnecessary_parenthesis: true
+    unnecessary_statements: true
+    use_function_type_syntax_for_parameters: true
+    void_checks: true

assets/FontManifest.json

@@ -1 +0,0 @@
-[{"family":"MaterialIcons","fonts":[{"asset":"fonts/MaterialIcons-Regular.ttf"}]}]

example/.gitignore

@@ -0,0 +1,37 @@
+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+#.vscode/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+.dart_tool/
+.flutter-plugins
+.flutter-plugins-dependencies
+.packages
+.pub-cache/
+.pub/
+/build/
+
+# Web related
+lib/generated_plugin_registrant.dart
+
+# Exceptions to above rules.
+!/packages/flutter_tools/test/data/dart_dependencies_test/**/.packages

example/README.md

@@ -0,0 +1,31 @@
+# Lottie Flutter examples
+
+### Simple usage
+
+```dart
+import 'package:flutter/material.dart';
+import 'package:lottie/lottie.dart';
+
+void main() => runApp(MyApp());
+
+class MyApp extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      home: Scaffold(
+        body: ListView(
+          children: [
+            // Load a Lottie file from your assets
+            Lottie.asset('assets/LottieLogo1.json'),
+
+            // Load a Lottie file from a remote url
+            Lottie.network(
+                'https://raw.githubusercontent.com/xvrh/lottie-flutter/master/sample_app/assets/Mobilo/A.json'),
+          ],
+        ),
+      ),
+    );
+  }
+}
+```
+

example/README.template.md

@@ -0,0 +1,8 @@
+# Lottie Flutter examples
+
+### Simple usage
+
+```dart
+import 'lib/examples/examples.dart';
+```
+

example/android/.gitignore

@@ -0,0 +1,7 @@
+gradle-wrapper.jar
+/.gradle
+/captures/
+/gradlew
+/gradlew.bat
+/local.properties
+GeneratedPluginRegistrant.java

example/android/app/build.gradle

@@ -0,0 +1,66 @@
+def localProperties = new Properties()
+def localPropertiesFile = rootProject.file('local.properties')
+if (localPropertiesFile.exists()) {
+    localPropertiesFile.withReader('UTF-8') { reader ->
+        localProperties.load(reader)
+    }
+}
+
+def flutterRoot = localProperties.getProperty('flutter.sdk')
+if (flutterRoot == null) {
+    throw new Exception("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
+}
+
+def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
+if (flutterVersionCode == null) {
+    flutterVersionCode = '1'
+}
+
+def flutterVersionName = localProperties.getProperty('flutter.versionName')
+if (flutterVersionName == null) {
+    flutterVersionName = '1.0'
+}
+
+apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
+apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
+
+android {
+    compileSdkVersion 28
+
+    sourceSets {
+        main.java.srcDirs += 'src/main/kotlin'
+    }
+
+    lintOptions {
+        disable 'InvalidPackage'
+    }
+
+    defaultConfig {
+        applicationId "com.github.xvrh.lottie.sample"
+        minSdkVersion 16
+        targetSdkVersion 28
+        versionCode flutterVersionCode.toInteger()
+        versionName flutterVersionName
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            // TODO: Add your own signing config for the release build.
+            // Signing with the debug keys for now, so `flutter run --release` works.
+            signingConfig signingConfigs.debug
+        }
+    }
+}
+
+flutter {
+    source '../..'
+}
+
+dependencies {
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'androidx.test:runner:1.1.1'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'
+}

example/android/app/src/debug/AndroidManifest.xml

@@ -0,0 +1,7 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.github.xvrh.lottie.sample">
+    <!-- Flutter needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>

example/android/app/src/main/AndroidManifest.xml

@@ -0,0 +1,30 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.github.xvrh.lottie.sample">
+    <!-- io.flutter.app.FlutterApplication is an android.app.Application that
+         calls FlutterMain.startInitialization(this); in its onCreate method.
+         In most cases you can leave this as-is, but you if you want to provide
+         additional functionality it is fine to subclass or reimplement
+         FlutterApplication and put your custom class here. -->
+    <application
+        android:name="io.flutter.app.FlutterApplication"
+        android:label="example"
+        android:icon="@mipmap/ic_launcher">
+        <activity
+            android:name=".MainActivity"
+            android:launchMode="singleTop"
+            android:theme="@style/LaunchTheme"
+            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
+            android:hardwareAccelerated="true"
+            android:windowSoftInputMode="adjustResize">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity>
+        <!-- Don't delete the meta-data below.
+             This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
+        <meta-data
+            android:name="flutterEmbedding"
+            android:value="2" />
+    </application>
+</manifest>

example/android/app/src/main/kotlin/com/github/xvrh/lottie/sample/MainActivity.kt

@@ -0,0 +1,12 @@
+package com.github.xvrh.lottie.sample
+
+import androidx.annotation.NonNull;
+import io.flutter.embedding.android.FlutterActivity
+import io.flutter.embedding.engine.FlutterEngine
+import io.flutter.plugins.GeneratedPluginRegistrant
+
+class MainActivity: FlutterActivity() {
+    override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {
+        GeneratedPluginRegistrant.registerWith(flutterEngine);
+    }
+}

example/android/app/src/main/res/drawable/launch_background.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Modify this file to customize your launch splash screen -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="@android:color/white" />
+
+    <!-- You can insert your own image assets here -->
+    <!-- <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item> -->
+</layer-list>

example/android/app/src/main/res/values/styles.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <style name="LaunchTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <!-- Show a splash screen on the activity. Automatically removed when
+             Flutter draws its first frame -->
+        <item name="android:windowBackground">@drawable/launch_background</item>
+    </style>
+</resources>

example/android/app/src/profile/AndroidManifest.xml

@@ -0,0 +1,7 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.github.xvrh.lottie.sample">
+    <!-- Flutter needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>

example/android/build.gradle

@@ -0,0 +1,31 @@
+buildscript {
+    ext.kotlin_version = '1.3.50'
+    repositories {
+        google()
+        jcenter()
+    }
+
+    dependencies {
+        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        jcenter()
+    }
+}
+
+rootProject.buildDir = '../build'
+subprojects {
+    project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
+    project.evaluationDependsOn(':app')
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}

example/android/gradle.properties

@@ -0,0 +1,4 @@
+org.gradle.jvmargs=-Xmx1536M
+android.enableR8=true
+android.useAndroidX=true
+android.enableJetifier=true

example/android/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,6 @@
+#Fri Jun 23 08:50:38 CEST 2017
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.2-all.zip

example/android/settings.gradle

@@ -0,0 +1,15 @@
+include ':app'
+
+def flutterProjectRoot = rootProject.projectDir.parentFile.toPath()
+
+def plugins = new Properties()
+def pluginsFile = new File(flutterProjectRoot.toFile(), '.flutter-plugins')
+if (pluginsFile.exists()) {
+    pluginsFile.withReader('UTF-8') { reader -> plugins.load(reader) }
+}
+
+plugins.each { name, path ->
+    def pluginDirectory = flutterProjectRoot.resolve(path).resolve('android').toFile()
+    include ":$name"
+    project(":$name").projectDir = pluginDirectory
+}