I have some pictures stored on /src/assets/img/.
Now I want to check if an image exists. If yes I want to display it, else I want to display a placeholder img.
I tried
async checkFile(strPath: string)
{
let contents = await Filesystem.readFile({
path: strPath,
directory: FilesystemDirectory.Data,
encoding: FilesystemEncoding.UTF8
});
console.log(contents);
}
Call:
checkFile('/assets/img/kategorien/image.jpg).then(function ...
But it doesn’t work. The file is not found. How do I have to set the path/directory for it to work?
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!
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 following the following flutter package to take a screenshot of my one app page:
https://pub.dev/packages/screenshot
I have successfully implemented the example and I can see my screenshots in the gallery.
My issue is that I would like to be able to NAME those images when they are stored in the gallery using some sort of numbering system. e.g. INV_0001, INV_0002.
Is there a way to do this in code? I have the following code that successfully takes the screenshot, but does not rename the file.
CODE
_imageGallerySaver() async {
final directory = (await getApplicationDocumentsDirectory()).path; //from path_provide package
String fileName = "Bob";
String pathName = '$directory/$fileName.png';
//print(path);
screenshotController
.capture(
path: pathName,
).then((File image) async {
print("image: $image");
setState(() {
_imageFile = image;
});
print(pathName);
final result =
await ImageGallerySaver.saveImage(image.readAsBytesSync());
print("File Saved to Gallery. result: $result");
//print("path: $path");
}).catchError((onError) {
print(onError);
});
}
SNIPPET
print("File Saved to Gallery. result: $result");
results in the following output:
File Saved to Gallery. result: file:///storage/emulated/0/app_name/1581602261670.png
I would like to rename the "1581602261670" part, if possible. Thank you
In your code, you are passing that file name to construct the path, then why not change the name there itself.
Anyway, you can rename an existing file using
await file.rename (newPath
):
Can't rename files using this method. Need to use a package called Gallery Saver:
https://pub.dev/packages/gallery_saver
This package allows you to set your own file name and save to the gallery.
I have a sound file in asset folder and I can check if it exist using code like below:
if (FileSystemEntity.typeSync(
'/Users/admin/Library/Developer/CoreSimulator/Devices/AC8BED2E-4EF1-4777-A399-EBD52E38B5C7/data/Containers/Data/Application/1390EE2C-A5D8-46E0-A414-AAC2B83CD20C/Library/Caches/sounds/3/unbeaten.m4a') !=
FileSystemEntityType.notFound) {
print('file is found');
} else {
print('not found');
}
As you can see I need to use the absolute path. Is there a way to check if the file is in the asset folder using path like 'assets/sounds/3/unbeaten.m4a' without the need to specify the whole path?
As was mentioned by #frank06, by using path_provider, I am able to check if a file is in asset folder or not by using the following code. But this works for iOS only and I am still trying to find a solution for Android. Notice the need to add /Library and /Caches for iOS. For Android, it seems that I can't see the path unlike that of iOS.
I would appreciate it if anyone could provide me some info for that of Android. The appDir looks like this for Android - /data/user/0/com.learnchn.alsospeak/app_flutter/
directory = await getApplicationDocumentsDirectory();
var parent = directory.parent;
var directoryPath = directory.path;
var parentPath = parent.path;
String testString = 'sounds/3/unbeaten.m4a';
parentPath = parentPath + '/Library' '/Caches/' '$testString';
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.