调用系统分享的Flutter组件，支持分享文本、图片、视频和文件
dependencies:
share_extend: "^1.1.9"
添加下面的key到工程的info.plist文件，路径 <project root>/ios/Runner/Info.plist，用于将分享的图片保存到相册
<key>NSPhotoLibraryAddUsageDescription</key>
<string>这里填写为什么需要相册写入权限的描述语句</string>
如果涉及到要分享存储空间里面的文件，需要用到读写存储空间权限的，请在项目的android模块的下，添加读写权限，路径为 <project root>/android/app/src/main/AndroidManifest.xml
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
import 'package:share_extend/share_extend.dart';
//分享文本
ShareExtend.share("share text", "text","android share panel title","share subject");
//分享图片 （例子中使用了一个image_picker的插件来实现图片的选择)
File f =
await ImagePicker.pickImage(source: ImageSource.gallery);
ShareExtend.share(f.path, "image");
//分享视频
File f = await ImagePicker.pickVideo(
source: ImageSource.gallery);
ShareExtend.share(f.path, "video");
//分享文件
Directory dir = Platform.isAndroid
? await getExternalStorageDirectory()
: await getApplicationDocumentsDirectory();
File testFile = new File("${dir.path}/flutter/test.txt");
if (!await testFile.exists()) {
await testFile.create(recursive: true);
testFile.writeAsStringSync("test for share documents file");
}
ShareExtend.share(testFile.path, "file");
//分享多图(借助了MultiImagePicker来多选获取图片图片，由于该库没有提供文件路径，因此demo里面先将图片保存为图片再调用分享)
_shareMultipleImages() async {
List<Asset> assetList = await MultiImagePicker.pickImages(maxImages: 5);
var imageList = List<String>();
for (var asset in assetList) {
String path =
await _writeByteToImageFile(await asset.getByteData(quality: 30));
imageList.add(path);
}
ShareExtend.shareMultiple(imageList, "image",subject: "share muti image");
}
Future<String> _writeByteToImageFile(ByteData byteData) async {
Directory dir = Platform.isAndroid
? await getExternalStorageDirectory()
: await getApplicationDocumentsDirectory();
File imageFile = new File(
"${dir.path}/flutter/${DateTime.now().millisecondsSinceEpoch}.png");
imageFile.createSync(recursive: true);
imageFile.writeAsBytesSync(byteData.buffer.asUint8List(0));
return imageFile.path;
}