compress image with native code(objc kotlin)
This library can work on android/ios.
Q：Dart has image related libraries to compress. Why use native?
A：For efficiency reasons, the compression efficiency of some dart libraries is not high, and it will be stuck to UI, even if isolate is used.
maybe, you need update your kotlin version to 1.2.71 or higher.
No problems found at present.
dependencies:
flutter_image_compress: ^0.2.0import 'package:flutter_image_compress/flutter_image_compress.dart';use:
Future<List<int>> testCompressFile(File file) async {
var result = await FlutterImageCompress.compressWithFile(
file.absolute.path,
minWidth: 2300,
minHeight: 1500,
quality: 94,
rotate: 90,
);
print(file.lengthSync());
print(result.length);
return result;
}
Future<File> testCompressAndGetFile(File file, String targetPath) async {
var result = await FlutterImageCompress.compressAndGetFile(
file.absolute.path, targetPath,
quality: 88,
rotate: 180,
);
print(file.lengthSync());
print(result.lengthSync());
return result;
}
Future<List<int>> testCompressAsset(String assetName) async {
var list = await FlutterImageCompress.compressAssetImage(
assetName,
minHeight: 1920,
minWidth: 1080,
quality: 96,
rotate: 180,
);
return list;
}
Future<List<int>> testComporessList(List<int> list) async {
var result = await FlutterImageCompress.compressWithList(
list,
minHeight: 1920,
minWidth: 1080,
quality: 96,
rotate: 135,
);
print(list.length);
print(result.length);
return result;
}you maybe need convert List<int> to 'Uint8List'
var u8 = Uint8List.fromList(list)
ImageProvider provider = MemoryImage(Uint8List.fromList(list));use in Image Widget
List<int> list = await testCompressFile(file);
ImageProvider provider = MemoryImage(Uint8List.fromList(list));
Image(
image: provider ?? AssetImage("img/img.jpg"),
),write to file
void writeToFile(List<int> list, String filePath) {
var file = File(filePath);
file.writeAsBytes(list, flush: true, mode: FileMode.write);
}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 the flutter/flutter/issues#21473
you need edit your kotlin version to 1.2.71+
If flutter supports more platforms (windows, mac, linux, other) in the future and you use this library, propose issue / PR