Flutter 保存一张网络图片到本地目录 [英] Flutter save a network image to local directory

问题描述

在 Flutter 中如何将图像从网络保存到本地目录.

In Flutter how to save an image from network to the local directory.

我是编码和解码图像的新手.有人能指出我正确的方向吗?

I am new to encoding and decoding images. Can anyone point me in the right direction?

推荐答案

如果您只想将图像(例如:.png)保存到设备，您可以通过简单的 get (http/http.dart) 和一个文件 (dart:io).

If all you want is to save an image (example: a .png) to the device, you can easily achieve this with a simple get (http/http.dart) and a File (dart:io).

为此，您可以参考以下示例:

To do so, you can base yourself in the example below:

var response = await http.get(imgUrl);
Directory documentDirectory = await getApplicationDocumentsDirectory();
File file = new File(join(documentDirectory.path, 'imagetest.png'));
file.writeAsBytesSync(response.bodyBytes); // This is a sync operation on a real 
                                           // app you'd probably prefer to use writeAsByte and handle its Future

请注意，在上面的案例中，我使用了 dart pub 中的path_provider"包.总的来说，您至少会导入以下项目:

Note that in the case above I’ve used the ‘path_provider’ package from the dart pub. In overall you would have imported at least these items:

import 'dart:io';
import 'package:http/http.dart' as http;
import 'package:path/path.dart';
import 'package:path_provider/path_provider.dart';

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