app直播原始碼，flutter 生成圖片並儲存到相簿

1、在pubspec.yaml新增依賴

  # 圖片儲存
  image_gallery_saver: ^1.7.1

​獲取外掛

flutter pub get

2、引入標頭檔案

import 'dart:io';
import 'dart:typed_data';
import 'package:image_gallery_saver/image_gallery_saver.dart';
import 'package:permission_handler/permission_handler.dart';
import 'dart:ui' as ui;

3、程式碼實現

  GlobalKey repaintKey = GlobalKey();
 
  Widget showQrCodeView() {
    return Container(
      child: Center(
        child: RepaintBoundary(
            key: repaintKey,
            child: Container(
              width: 200.px,
              height: 230.px,
              color: Colors.blue,
            )),
      ),
    );
  } 
 
  void saveQrcodeImage() {
    Alert.showLoading();
    RenderRepaintBoundary boundary =
        repaintKey.currentContext.findRenderObject();
    boundary.toImage(pixelRatio: SizeUtil.pixelRatio).then((value) async {
      ByteData byteData =
          await value.toByteData(format: ui.ImageByteFormat.png);
      Uint8List pngBytes = byteData.buffer.asUint8List();
      Permission filePermission =
          AppEnv.isIos ? Permission.photos : Permission.storage;
      var status = await filePermission.status;
      if (!status.isGranted) {
        Map<Permission, PermissionStatus> statuses =
            await [filePermission].request();
        saveQrcodeImage();
      }
      if (status.isGranted) {
        final result = await ImageGallerySaver.saveImage(pngBytes, quality: 80);
        print(result.toString());
        if (result["isSuccess"]) {
          Alert.showSuccess(message: "儲存成功");
          print('圖片儲存 ok');
          // toast("儲存成功", wring: false);
        } else {
          print('圖片儲存 error');
          // toast("儲存失敗");
        }
      }
      if (status.isDenied) {
        print("拒絕訪問照片檔案");
      }
    });
  }

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