1 year ago
#383935
Kin Pu
How can I download multiple images from Firebase Storage on Flutter Web?
I am developing a Flutter Web application that, after clicking a download button, I need to download multiple images from Firebase Storage.
How can I don this on Flutter Web?
UPDATE:
After following Frank's suggestion on the comments, and other posts. I wrote the following function:
Future<void> downloadProductImages() async {
//TODO: modify on suppliers admin that images are saved with the correct name.
final storageRef = FirebaseStorage.instance.ref();
int count = 1;
for (final ref in product.imgsMap.keys.toList()) {
print(ref);
try {
final childRef = storageRef.child(ref);
const maxSize = 10 * 1024 * 1024;
final Uint8List data = (await childRef.getData(maxSize))!;
//check if file is jpeg
late String ext;
if (data[0] == 0xFF &&
data[1] == 0xD8 &&
data[data.length - 2] == 0xFF &&
data[data.length - 1] == 0xD9) {
ext = 'jpeg';
} else {
ext = 'png';
}
// Data for "images/island.jpg" is returned, use this as needed.
final content = base64Encode(data!.toList());
AnchorElement(
href:
"data:application/octet-stream;charset=utf-16le;base64,$content")
//href: "image/$ext;charset=utf-16le;base64,$content")
..setAttribute("download", "${product.name}_$count.$ext")
..click();
count++;
} on FirebaseException catch (e) {
//TODO: HANDLE EXCEPTIONS
print(e);
} on Exception catch (e) {
// Handle any errors.
print(e);
}
}
// File file = // generated somewhere
// final rawData = file.readAsBytesSync();
}
On chrome mobile, the files are downloaded but are not recognized as pictures. It seems that the AnchorElment doesn't have the correct href.
Any ideas?
flutter
firebase-storage
flutter-web
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