Question

我是“ flutter”的新手，我有疑问。可以复制图像并将其保存在设备中吗？

  File image;

  picker() async {
    print('Picker is called');
    File img = await p.ImagePicker.pickImage(source: p.ImageSource.gallery);
    if (img != null) {
      image = img;
      setState(() {});
    }
  }

  save() async {
    print('Save is called');
    final Directory path = await image.parent;

    setState(() {});
  }

我有我的图像，可以获取目录的路径。但是，如何使用其他名称将该图像保存在此目录中？假设我的图片叫做x.jpg，我希望将同一张图片保存为y.jpg，而不删除x.jpg

Answer 1

使用simple_permissions插件获得写入外部存储的权限。

使用path_provider插件获取外部存储文件夹的路径

最后使用image插件编写图像

示例代码

Future<Io.File> saveImage(Io.File file) async {
  try {
    var dir = await getExternalStorageDirectory();
    var testdir =
        await new Io.Directory('${dir.path}/testfolder').create(recursive: true);
    IM.Image image = IM.decodeImage(file.readAsBytesSync());
    return new Io.File(
        '${testdir.path}/${DateTime.now().toUtc().toIso8601String()}.png')
      ..writeAsBytesSync(IM.encodePng(image));
  } catch (e) {
    print(e);
    return null;
  }
}

还要检查权限

void checkPer() async {
    bool checkResult = await SimplePermissions.checkPermission(
        Permission.WriteExternalStorage);
    if (!checkResult) {
      var status = await SimplePermissions.requestPermission(
          Permission.WriteExternalStorage);
      //print("permission request result is " + resReq.toString());
      if (status == PermissionStatus.authorized) {
        //saveimage
      }
    } else {
      //saveimage
    }
  }

命名空间

import 'dart:io' as Io;
import 'package:image/image.dart' as IM;
import 'package:path_provider/path_provider.dart';
import 'package:simple_permissions/simple_permissions.dart';

dart-复制图像并保存在同一目录中

1 个答案: