flutter_webp 0.2.1

flutter_webp #

Convert and save image as WebP.

This library currently working only on Android. We need your help!

Usage #

dependencies:
  flutter_webp: ^0.2.0
import 'package:flutter_webp/flutter_webp.dart';

Use as:

  Future<List<int>> testCompressFile(File file) async {
    var result = await FlutterWebp.compressWithFile(
      file.absolute.path,
      width: 2300,
      height: 1500,
      quality: 94,
      rotate: 90,
    );
    print(file.lengthSync());
    print(result.length);
    return result;
  }

  Future<File> testCompressAndGetFile(File file, String targetPath) async {
    var result = await FlutterWebp.compressAndGetFile(
        file.absolute.path,
        targetPath,
        height: 1920,
        width: 1080,
        quality: 88,
        rotate: 180,
      );

    print(file.lengthSync());
    print(result.lengthSync());

    return result;
  }

  Future<List<int>> testCompressAsset(String assetName) async {
    var list = await FlutterWebp.compressAssetImage(
      assetName,
      height: 1920,
      width: 1080,
      quality: 96,
      rotate: 180,
    );

    return list;
  }

  Future<List<int>> testComporessList(List<int> list) async {
    var result = await FlutterWebp.compressWithList(
      list,
      height: 1920,
      width: 1080,
      quality: 96,
      rotate: 135,
    );
    print(list.length);
    print(result.length);
    return result;
  }

Result #

The result of returning a List collection will not have null, but will always be an empty array.

The returned file may be null. In addition, please decide for yourself whether the file exists.

About List<int> and Uint8List

You may need to convert List<int> to Uint8List to display images.

To use Uint8List, you need import package to your code like so:

img

final image = Uint8List.fromList(imageList)
ImageProvider provider = MemoryImage(Uint8List.fromList(imageList));

Usage in Image Widget:

List<int> image = await testCompressFile(file);
ImageProvider provider = MemoryImage(Uint8List.fromList(image));

Image(
  image: provider ?? AssetImage("img/img.jpg"),
),

Write to file usage:

void writeToFile(List<int> image, String filePath) {
  final file = File(filePath);
  file.writeAsBytes(image, flush: true, mode: FileMode.write);
}

Troubleshooting #

Compressing returns null

Sometimes, compressing will return null. You should check if you can read/write the file, and the parent folder of the target file must exist.

For example, use the path_provider plugin to access some application folders, and use a permission plugin to request permission to access SD cards on Android/iOS.

Android build error #

Caused by: org.gradle.internal.event.ListenerNotificationException: Failed to notify project evaluation listener.
        at org.gradle.internal.event.AbstractBroadcastDispatch.dispatch(AbstractBroadcastDispatch.java:86)
        ...
Caused by: java.lang.AbstractMethodError
        at org.jetbrains.kotlin.gradle.plugin.KotlinPluginKt.resolveSubpluginArtifacts(KotlinPlugin.kt:776)
        ...

See flutter/flutter/issues#21473

You need to upgrade your Kotlin version to 1.2.71+.

If Flutter supports more platforms (Windows, Mac, Linux, etc) in the future and you use this library, propose an issue or PR!

0.2.1 #

  • Fix required Flutter version

0.2.0 #

  • Fix support for last Flutter version (fix error with ImageStreamListener).

0.1.0 #

  • Initial version

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:


dependencies:
  flutter_webp: ^0.2.1

2. Install it

You can install packages from the command line:

with Flutter:


$ flutter pub get

Alternatively, your editor might support flutter pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:


import 'package:flutter_webp/flutter_webp.dart';
  
Popularity:
Describes how popular the package is relative to other packages. [more]
44
Health:
Code health derived from static analysis. [more]
100
Maintenance:
Reflects how tidy and up-to-date the package is. [more]
90
Overall:
Weighted score of the above. [more]
70
Learn more about scoring.

We analyzed this package on Sep 20, 2019, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.5.0
  • pana: 0.12.21
  • Flutter: 1.9.1+hotfix.2

Platforms

Detected platforms: Flutter

References Flutter, and has no conflicting libraries.

Maintenance suggestions

Maintain an example. (-10 points)

Create a short demo in the example/ directory to show how to use this package.

Common filename patterns include main.dart, example.dart, and flutter_webp.dart. Packages with multiple examples should provide example/README.md.

For more information see the pub package layout conventions.

Dependencies

Package Constraint Resolved Available
Direct dependencies
Dart SDK >=2.0.0-dev.28.0 <3.0.0
flutter 0.0.0
Transitive dependencies
collection 1.14.11 1.14.12
meta 1.1.7
sky_engine 0.0.99
typed_data 1.1.6
vector_math 2.0.8