Download file from url, save to phones storage

Question

I\'m working on a project, that requires me to download a file from URL, once a button is tapped, and store it to phone storage (probably downloads folder).

Any idea

Answer 1

Use https://pub.dartlang.org/packages/flutter_downloader. Don't forget to do platform configurations.

Basically, this is how you should use the package. There is a detailed long example in the link.

final taskId = await FlutterDownloader.enqueue(
  url: 'your download link',
  savedDir: 'the path of directory where you want to save downloaded files',
  showNotification: true, // show download progress in status bar (for Android)
  openFileFromNotification: true, // click on notification to open downloaded file (for Android)
);

Answer 2

If you want to download and save file from URL without external libraries, you can use this code. It works for me, but I do not check it on big files. Good luck.

Future<String> downloadFile(String url, String fileName, String dir) async {
        HttpClient httpClient = new HttpClient();
        File file;
        String filePath = '';
        String myUrl = '';
    
        try {
          myUrl = url+'/'+fileName;
          var request = await httpClient.getUrl(Uri.parse(myUrl));
          var response = await request.close();
          if(response.statusCode == 200) {
            var bytes = await consolidateHttpClientResponseBytes(response);
            filePath = '$dir/$fileName';
            file = File(filePath);
            await file.writeAsBytes(bytes);
          }
          else
            filePath = 'Error code: '+response.statusCode.toString();
        }
        catch(ex){
          filePath = 'Can not fetch url';
        }
    
        return filePath;
      }

For Android do not forgetto add these lines in the manifest file, otherwise it will not work on real device after build apk:

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

Answer 3

static var httpClient = new HttpClient();
Future<File> _downloadFile(String url, String filename) async {
  var request = await httpClient.getUrl(Uri.parse(url));
  var response = await request.close();
  var bytes = await consolidateHttpClientResponseBytes(response);
  String dir = (await getApplicationDocumentsDirectory()).path;
  File file = new File('$dir/$filename');
  await file.writeAsBytes(bytes);
  return file;
}

Answer 4

FlutterChina's Dio seems like the way to go. https://github.com/flutterchina/dio/. It's robust and gives you options to retrieve the progress of your download/upload