It's been 3 days that I try to fix an issue with the download of audio files with my Flutter application. When I try to download audio files, the request keep the "pending" status and finish with no error.
I have research a lot and find something about the contentLength of the client who is always at 0 but it doesn't help.
Now I have tried to make a get request to a website with sample audio files and it doesn't work too. I have tested via Postman and it always work.
My function:
Future<void> _download(String url, String filepath) async {
final response = await this.get("https://file-examples-com.github.io/uploads/2017/11/file_example_MP3_700KB.mp3");// await this.get("$baseURL$url");
log("Try to get audio files: ${response.isOk}");
if (response.isOk) {
File file = File(filepath);
final raf = file.openSync(mode: FileMode.write);
response.bodyBytes.listen((value) {
raf.writeFromSync(value);
}, onDone: () {
log("closed $filepath");
raf.closeSync();
});
}
}
The response.isOk is always false.
I used GetConnect from GetX package who used httpClient.
Via Dart devtools I obtain this from the request:
https://prnt.sc/1q3w33z
https://prnt.sc/1q3x9ot
So I used another package: Dio and now it works.
Related
Package tried: https://pub.dev/packages/file_picker
Tried the example code implementation shared via GitHub. But the file path is returned as null for
web platform. Where same implementation in mobile platform return the path as expected.
https://github.com/miguelpruivo/flutter_file_picker/blob/master/example/lib/src/file_picker_demo.dart
Things aware of:
Path_Provider - Not supported for web
dart-io-library - Not supported for web
Open issue in Flutter Repo
Goal is to read the file from the path and not to upload. Any workaround to achieve this will be helpful.
Flutter channel: beta
As mentioned in the file_picker FAQ:
Paths aren't inaccessible from browsers since those provide fake paths. If you want to create a File instance to upload it somewhere, like FireStorage, you can do so with the bytes directly.
final result = await FilePicker.platform.pickFiles(type: FileType.any, allowMultiple: false);
if (result.files.first != null){
var fileBytes = result.files.first.bytes;
var fileName = result.files.first.name;
print(String.fromCharCodes(fileBytes));
}
I have a function for picking image from computer. Might work for you.
import 'dart:html';
void uploadImage({#required Function(File file) onSelected}) {
InputElement uploadInput = FileUploadInputElement()..accept = 'image/*';
uploadInput.click();
uploadInput.onChange.listen((event) {
final file = uploadInput.files.first;
final reader = FileReader();
reader.readAsDataUrl(file);
reader.onLoadEnd.listen((event) {
onSelected(file);
});
});
}
Is there any way to get files like .pdf downloaded directly on user's device instead of opening this pdf in the browser?
This code works for downloading non browser supported files but it opens pdf, mp3, etc. in the browser.
final anchor = AnchorElement(
href: pickedFile)
..setAttribute("download", fileName)
..click();
If someone is still searching for solution.Here is what I have done.
Anchor tag will directly download file if it has download attribute.
Note: Download attribute is only supported for same-origin request
So instead of assigning external URL link to anchor element. Create Blob object from PDF data and create Object URL from that.
var url = Url.createObjectUrlFromBlob(Blob([data]));
AnchorElement(href: url)
..setAttribute('download', '<downloaded_file_name.pdf>')
..click();
I am using Firebase to store file so here is the complete code.
FirebaseStorage.instance.ref(resumeFileName).getData().then(
(data) {
var url = Url.createObjectUrlFromBlob(Blob([data]));
AnchorElement(href: url)
..setAttribute('download', '<downloaded_file_name.pdf>')
..click();
}
);
by following the steps below, you can download the file automatically by the browser and save it in the download directory.
In this method, http and universal_html packages are used.
The important thing is to manage Multiplatform-Mode and using this code, is better you create 3 separate dart files.
switch_native_web.dart
web.dart
native.dart
/// switch_native_web.dart
import 'native.dart' if (dart.library.html) 'web.dart' as switch_value;
class SwitchNativeWeb {
static void downloadFile({required String url,
required String fileName ,required String dataType}){
switch_value.downloadFile(dataType: dataType,fileName: fileName,url: url);}
}
...
/// web.dart
import 'dart:convert';
import 'package:http/http.dart' as http;
import 'package:universal_html/html.dart' as universal_html;
Future<void> downloadFile(
{required String url,
required String fileName,
required String dataType}) async {
try {
// first we make a request to the url like you did
// in the android and ios version
final http.Response r = await http.get(
Uri.parse(url),
);
// we get the bytes from the body
final data = r.bodyBytes;
// and encode them to base64
final base64data = base64Encode(data);
// then we create and AnchorElement with the html package
final a =
universal_html.AnchorElement(href: '$dataType;base64,$base64data');
// set the name of the file we want the image to get
// downloaded to
a.download = fileName;
// and we click the AnchorElement which downloads the image
a.click();
// finally we remove the AnchorElement
a.remove();
} catch (e) {
print(e);
}
}
...
/// native.dart
Future<void> downloadFile({required String url, required String fileName,
required String dataType}) async {}
And using the following sample code for calling the downloadFile method wherever you need:
...
GestureDetector(
onTap: () => SwitchNativeWeb.downloadFile(
url: "https://... your url ..../download.jpg",
fileName: "download.jpg",
dataType: "data:image/jpeg"),
child: Text('download')
)
...
I only wrote the code related to web download (according to the question), you can write the code related to ios and android download in the native .dart file.
Use Dio Library.
dependencies:
dio: ^3.0.10
to download file
response = await dio.download("https://www.google.com/", "./xx.html");
this video will help you.
I have this page where the camera is initialized and ready with a button that will record and stop the video, so I tried this :
FlatButton(
onPressed: () => {
!isRecording
? {
setState(() {
isRecording = true;
}),
cameraController.prepareForVideoRecording(),
cameraController.startVideoRecording('assets/Videos/test.mp4')
}
: cameraController.stopVideoRecording(),
},
............
but throws this error : nhandled Exception: CameraException(videoRecordingFailed, assets/Videos/test.mp4: open failed: ENOENT (No such file or directory)).
I don't understand, I don't want to open this file I want to save it there, Is there sth wrong with my code ?
In the new version, static method startRecordingVideo doesn't take any string parameter.
When you want to start the recording just see whether a video is already getting recorded, if not start
if (!_controller.value.isRecordingVideo) {
_controller.startVideoRecording();
}
and when you want to finish the recording you can call the static method stopVideoRecording() and it will give you a object of the class XFile, it will have the path to your video.
if (_controller.value.isRecordingVideo) {
XFile videoFile = await _controller.stopVideoRecording();
print(videoFile.path);//and there is more in this XFile object
}
This thing has worked for me. I am new to flutter please improve my answer if you know more.
You are trying to save a video in your assets folder which is not possible ,
What you need to do is to save to device locally either common folders like downloads or app directory.
Here is an example of how to go about it
dependencies:
path_provider:
Flutter plugin for getting commonly used locations on host platform
file systems, such as the temp and app data directories.
We will be saving the video to app directory.
We need to get the path to the directory where the file is or will be. Usually a file is put in the application's document directory, in the application's cache directory, or in the external storage directory. To get the path easily and reduce the chance of type, we can use PathProvider
Future<String> _startVideoRecording() async {
if (!controller.value.isInitialized) {
return null;
}
// Do nothing if a recording is on progress
if (controller.value.isRecordingVideo) {
return null;
}
//get storage path
final Directory appDirectory = await getApplicationDocumentsDirectory();
final String videoDirectory = '${appDirectory.path}/Videos';
await Directory(videoDirectory).create(recursive: true);
final String currentTime = DateTime.now().millisecondsSinceEpoch.toString();
final String filePath = '$videoDirectory/${currentTime}.mp4';
try {
await controller.startVideoRecording(filePath);
videoPath = filePath;
} on CameraException catch (e) {
_showCameraException(e);
return null;
}
//gives you path of where the video was stored
return filePath;
}
I am using api in flutter that is returning media data so how to handle this.
ScreenShot of my code
Post Man screenshot
Thanks in advance for your precious time.
Save your response to temp file or application document directory and add Image.file widget to your project to show this downloaded file. to save file you can use path_provider package.
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();
}
also check this stackoverflow question and answers.
Looking for a good sample working code for downloading any file from URL in flutter. If its with native downloader then this will be very good. Please help me with sample of code to download any file using native downloader in flutter.
I have used few libraries but didn't turned out well.
For a mobile device, I used the http package to download a file to the applications document directory
First, create a httpClient object
static var httpClient = new HttpClient();
Then you can create a function like this to download the file:
Future<void> _downloadFile({
required String fileName,
}) async {
String url = ...;
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'); // Note: Filename must contain the extension of the file too, like pdf, jpg etc.
await file.writeAsBytes(bytes);
}
For a flutter web application, I felt the url_launcher package was the easiest to work with.
_launchURL() async {
String url = ...;
if (await canLaunch(url)) {
await launch(url);
print('URL Launcher success');
} else {
throw Exception('Could not launch $url');
}
}
The url_launcher package code works even for a mobile device but it opens a new browser window to download the required file which is not a good user experience so I have used 2 approaches for the same problem.
Hope I have answered your query.