I have a sound file in asset folder and I can check if it exist using code like below:
if (FileSystemEntity.typeSync(
'/Users/admin/Library/Developer/CoreSimulator/Devices/AC8BED2E-4EF1-4777-A399-EBD52E38B5C7/data/Containers/Data/Application/1390EE2C-A5D8-46E0-A414-AAC2B83CD20C/Library/Caches/sounds/3/unbeaten.m4a') !=
FileSystemEntityType.notFound) {
print('file is found');
} else {
print('not found');
}
As you can see I need to use the absolute path. Is there a way to check if the file is in the asset folder using path like 'assets/sounds/3/unbeaten.m4a' without the need to specify the whole path?
As was mentioned by #frank06, by using path_provider, I am able to check if a file is in asset folder or not by using the following code. But this works for iOS only and I am still trying to find a solution for Android. Notice the need to add /Library and /Caches for iOS. For Android, it seems that I can't see the path unlike that of iOS.
I would appreciate it if anyone could provide me some info for that of Android. The appDir looks like this for Android - /data/user/0/com.learnchn.alsospeak/app_flutter/
directory = await getApplicationDocumentsDirectory();
var parent = directory.parent;
var directoryPath = directory.path;
var parentPath = parent.path;
String testString = 'sounds/3/unbeaten.m4a';
parentPath = parentPath + '/Library' '/Caches/' '$testString';
Related
I create a flutter app and I have this one CSV file that used as a template for user. I want to provide a Button that allow user to download this CSV file, so they can use it to have CSV file that already have our template.
The problem is I don't know if the best way is to first store the file online and get the url and use it on the flutter downloader URL or keep it in the local code asset and refer to that file when user tap the download template button. Currently I'm applying the second option and it doesn't work (I don't know if this option is possible or not), the download always fail. I'm using flutter_downloader package.
How to fix this ?
Here's my code, Is something wrong with my code ?
/// Check if the file exist or not
if (await File(externalDir!.path + "/" + fileName).exists()) {
OpenFilex.open(externalDir!.path + "/" + fileName);
} else {
/// Download the file if it doesn't exist in the user's device
final String localPath = (await getApplicationDocumentsDirectory()).path;
/// Dummy file name I want use (it exist in my asset dir"
const String fileName = 'add.png';
final data = await rootBundle.load('assets/logo/add.png');
final bytes = data.buffer.asUint8List();
final File file = File('$localPath/$fileName');
await file.writeAsBytes(bytes);
/// Download the file
final taskId = await FlutterDownloader.enqueue(
url: '',
savedDir: localPath,
fileName: fileName,
showNotification: true,
openFileFromNotification: true,
);
}
To load a file from the AppBundle and then save it to the users phone, do the following:
Put the file in assets/filename.csv and declare it in your pubspec like this:
flutter:
assets:
- assets/filename.csv
Load the file in your code:
import 'package:flutter/services.dart' show ByteData, rootBundle;
(...)
var data = (await rootBundle.load('assets/filename.csv)).buffer.asInt8List();
Save the data to a file (you need the path-provider package if you want to copy the exact code):
import 'package:path_provider/path_provider.dart' as pp;
(...)
var path = (await pp.getApplicationDocumentsDirectory()).path;
var file = File('$path/filename.csv');
await file.writeAsBytes(data, flush: true);
Edit: As Stephan correctly pointed out, if you want to store the file in the downloads folder, you will find additional information about that here. Thank you Stephan!
var tempDir = await getTemporaryDirectory();
String fullPath = "${tempDir.path}/boo2.pdf'";
print('full path $fullPath');
File file = File(fullPath);
if (await file.exists() && Platform.isAndroid)
{
} else {
download2(dio, imgUrl, fullPath);
}
Above code is used to download pdf file in flutter. If file exist in device then it should directly open it. and if it is not then it should download. Now the problem is I dont know how to open exist pdf.
Most simple solution would be to use open_filex
import 'package:open_filex/open_filex.dart';
OpenFilex.open(fullPath);
this will help you : open_file: ^3.2.1
this is the link : https://pub.dev/packages/open_file
you can open pdf by using this
In my flutter application I can create a pdf file, then I want to save it in Download folder.
I'm trying to achieve this goal with path_provider package, but I can't.
This is the sample code from flutter's cookbook, If I use it I don't get any error, but I don't find the file either.
final directory = await getApplicationDocumentsDirectory();
File file2 = File("${directory.path}/test.txt");
await file2.writeAsString('TEST ONE');
What's the correct way to do it?
To find the correct path please use ext_storage.
You will need this permission
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
on Android 10 you need this in your manifest
<application
android:requestLegacyExternalStorage="true"
on Android 11 use this instead
<uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE" />
Remember to ask for them using permission_handler
I leave you my code:
static Future saveInStorage(
String fileName, File file, String extension) async {
await _checkPermission();
String _localPath = (await ExtStorage.getExternalStoragePublicDirectory(
ExtStorage.DIRECTORY_DOWNLOADS))!;
String filePath =
_localPath + "/" + fileName.trim() + "_" + Uuid().v4() + extension;
File fileDef = File(filePath);
await fileDef.create(recursive: true);
Uint8List bytes = await file.readAsBytes();
await fileDef.writeAsBytes(bytes);
}
Android 11 changed a lot of things with its emphasis on scoped storage. Although /storage/emulated/0/Android/data/com.my.app/files is one of the directory paths given by the path_provider pkg, you won't be able to see files saved in /storage/emulated/0/Android/data/com.my.app/files just using any run-of-the-mill file application (Google Files, Samsung My Files, etc.).
A way to get around this (although it only works on Android) is to specify the "general" downloads folder as shown below.
Directory generalDownloadDir = Directory('/storage/emulated/0/Download');
if you write whatever file you are trying to save to that directory, it will show up in the Downloads folder in any standard file manager application, rather than just the application-specific directory that the path_provider pkg provides.
Below is some test code from an app I'm building where I save a user-generated QR code to the user's device. Just for more clarity.
//this code "wraps" the qr widget into an image format
RenderRepaintBoundary boundary = key.currentContext!
.findRenderObject() as RenderRepaintBoundary;
//captures qr image
var image = await boundary.toImage();
String qrName = qrTextController.text;
ByteData? byteData =
await image.toByteData(format: ImageByteFormat.png);
Uint8List pngBytes = byteData!.buffer.asUint8List();
//general downloads folder (accessible by files app) ANDROID ONLY
Directory generalDownloadDir = Directory('/storage/emulated/0/Download'); //! THIS WORKS for android only !!!!!!
//qr image file saved to general downloads folder
File qrJpg = await File('${generalDownloadDir.path}/$qrName.jpg').create();
await qrJpg.writeAsBytes(pngBytes);
Fluttertoast.showToast(msg: ' $qrName QR code was downloaded to ' + generalDownloadDir.path.toString(), gravity: ToastGravity.TOP);
You want getExternalStorageDirectories. You can pass a parameter to specify the downloads specifically:
final directory = (await getExternalStorageDirectories(type: StorageDirectory.downloads)).first!;
File file2 = File("${directory.path}/test.txt");
await file2.writeAsString('TEST ONE');
If you're using null safety you don't need the bang operator:
final directory = (await getExternalStorageDirectories(type: StorageDirectory.downloads)).first;
File file2 = File("${directory.path}/test.txt");
await file2.writeAsString('TEST ONE');
For downloading file in Downloads folder, here are examples:
// Save multiple files
DocumentFileSave.saveMultipleFiles([textBytes, textBytes2], ["text1.txt", "text2.txt"], ["text/plain", "text/plain"]);
//Save single text file
DocumentFileSave.saveFile(textBytes, "my_sample_file.txt", "text/plain");
//Save single pdf file
DocumentFileSave.saveFile(pdfBytes, "my_sample_file.pdf", "appliation/pdf");
//Save single image file
DocumentFileSave.saveFile(imageJPGBytes, "my_sample_file.jpg", "image/jpeg");
More details of library here:
https://pub.dev/packages/document_file_save_plus
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);
});
});
}
enter image description hereI have the url and now when I click on specific url then it should navigate to next page and open the file , here but it say that no such file directory exits.
Future<File> getFileFromUrl(String url) async {
try {
var data = await http.get(url);
var bytes = data.bodyBytes;
var dir = await getApplicationDocumentsDirectory();
File file = File("${dir.path}/mypdfonline.pdf");
File urlFile = await file.writeAsBytes(bytes);
return urlFile;
} catch (e) {
throw Exception("Error opening url file");
}
}
I should get filepath
If you are trying to open an url, you need url_launcher plugin support or web view plugin support to load the URL content. But it looks like that your trying to access the file from assets, I'm thinking. If is that so, did you added your file in assets folder and adding the path inside pubspec.yaml file. Then you have to access the file using from assets.
If my answer not helpful, please elaborate your question a bit clear with some screenshot of your app, that what you are trying to achieve. Thank you.... Happy learning.