如何保存颤振中的图像文件?使用图像选取器插件选择的文件

使用 await ImagePicker.pickImage(...) ,因为函数返回 File .

这个 文件 类有一个 copy method ,您可以使用它复制文件(该文件已通过相机或放在图库中保存在磁盘上),并将其放入应用程序文档目录:

// using your method of getting an image
final File image = await ImagePicker.pickImage(source: imageSource);

// getting a directory path for saving
final String path = await getApplicationDocumentsDirectory().path;

// copy the file to a new path
final File newImage = await image.copy('$path/image1.png');

setState(() {
  _image = newImage;
});

您还应该注意,您可以从 ImagePicker 使用 image.path ,它还将包含您可能要提取的文件结尾,您可以使用 newImage.path .

@CreativeCreatorNormaybonot答案确实很有帮助,但它遗漏了一个重要的部分,即检索图像供以后使用。

保存图像

// Step 1: Retrieve image from picker 
final File image = await ImagePicker.pickImage(source: imageSource);

// Step 2: Check for valid file
if (image == null) return;

// Step 3: Get directory where we can duplicate selected file.
final String path = await getApplicationDocumentsDirectory().path;

// Step 4: Copy the file to a application document directory. 
final var fileName = basename(file.path);
final File localImage = await image.copy('$path/$fileName');

提示:您可以检索 文件名 从原始文件使用 basename(文件.path) . 确保导入“package:path/path.dart”;

检索/加载图像

// Step 1: Save image/file path as string either db or shared pref
SharedPreferences prefs = await SharedPreferences.getInstance();
prefs.setString('test_image', localImage.path)

// Step 2: Loading image by using the path that we saved earlier. We can create a file using path 
//         and can use FileImage provider for loading image from file.
CircleAvatar(
          backgroundImage: FileImage(File(prefs.getString('test_image')),
          radius: 50,
          backgroundColor: Colors.white)