[英]How can I overwrite an assets image in Flutter having a source image?
I'm fairly new to Dart and Flutter, and I'm having trouble to overwrite an existing assets image from a source image.我对 Dart 和 Flutter 还很陌生,我无法从源图像覆盖现有资产图像。
My attempt:我的尝试:
try {
File localFile = File('assets/images/myImage.png');
localFile.writeAsBytesSync(originFile.readAsBytesSync());
catch (e) {
log(e.toString());
}
I get:我得到:
[log] FileSystemException: Cannot open file, path = 'assets/images/myImage.png' (OS Error: No such file or directory, errno = 2)
I did define the assets folder in pubspec.yaml :我确实在pubspec.yaml中定义了 assets 文件夹:
assets:
- assets/images/
Ok, so I've read somewhere that the asset file can be accessed like this:好的,所以我在某处读到可以像这样访问资产文件:
import 'package:flutter/services.dart' show rootBundle;
final byteData = await rootBundle.load('assets/images/myImage.png');
But I don't know how to convert byteData to a File object that represents the actual file.但我不知道如何将byteData转换为代表实际文件的File object。
I think I'm missing something very basic here.我想我在这里遗漏了一些非常基本的东西。 Or maybe is there is a proper way to do this that has nothing to do with this approach?
或者也许有一种与这种方法无关的正确方法来做到这一点?
Please help.请帮忙。
Thanks in advance!提前致谢!
If you want to write a file on a user device you should look here: https://flutter.dev/docs/cookbook/persistence/reading-writing-files如果你想在用户设备上写文件,你应该看这里: https://flutter.dev/docs/cookbook/persistence/reading-writing-files
Shared preferences are a space in a phone where you app can write, so it's exactly what you want!共享偏好是手机中的一个空间,您可以在其中编写应用程序,因此这正是您想要的!
Assets are part of you app and are not meant to be modified within the app.资产是您应用程序的一部分,不应在应用程序内进行修改。
During a build, Flutter places assets into a special archive called the asset bundle that apps read from at runtime.
在构建过程中,Flutter 将资产放入名为资产包的特殊存档中,应用程序在运行时从中读取。 According to the flutter website
根据 flutter 网站
Hope this helps!希望这可以帮助!
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