Downloading image to file from firebase in flutter - firebase

Question

I am trying to store images from firebase storage to the phone so that they can be available offline (downloaded). I am aware of this Stack Overflow question Download an image from Firebase to Flutter
-- but that solution seems outdated as the "getData()" method now requires a maxSize-- (I just pick a high number like 9999999).
My current attempt looks like this. My thought process is that by downloading the data, I can then write it to a local file. I am using the path_provider pub.
static Future<List<int>> downloadImage(String title, String route) async{
List<int> data = await FirebaseStorage.instance.ref().child("English/routes/" + route + "/" + title +".jpg").getData(1000000);
var text = new String.fromCharCodes(data);
print("data= "+data.toString());
print("text= " +text);
return data;
}
Future<String> get _localPath async {
final directory = await getApplicationDocumentsDirectory();
return directory.path;
}
Future<File> localFile(String fileName) async {
final path = await _localPath;
return new File('$path/'+fileName+'.txt');
}
Future<File> writeImage(List<int> bytes, File file) async {
// Write the file
return file.writeAsBytes(bytes);
}
When I run downloadImage, I get the following errors over and over again, overflowing my console.
I can't tell whether the error is due to authentication, because of the following error message
(E/StorageUtil(15931): error getting token java.util.concurrent.ExecutionException: com.google.firebase.internal.api.FirebaseNoSignedInUserException: Please sign in before trying to get a token.)
Or maybe something to do with the "maxSize", because of this error message
java.lang.IndexOutOfBoundsException: the maximum allowed buffer size was exceeded.
Or maybe both! But my rules are set to true for reading and writing so I don't even see how authentication has anything to do with it. I've not had to sign in before.
E/StorageException(15931): StorageException has occurred.
E/StorageException(15931): An unknown error occurred, please check the HTTP result code and inner exception for server response.
E/StorageException(15931): Code: -13000 HttpResult: 200
E/StorageException(15931): the maximum allowed buffer size was exceeded.
E/StorageException(15931): java.lang.IndexOutOfBoundsException: the maximum allowed buffer size was exceeded.
E/StorageException(15931): at com.google.firebase.storage.zzi.doInBackground(Unknown Source)
E/StorageException(15931): at com.google.firebase.storage.StreamDownloadTask.run(Unknown Source)
E/StorageException(15931): at com.google.firebase.storage.StorageTask.zzl(Unknown Source)
E/StorageException(15931): at com.google.firebase.storage.zzq.run(Unknown Source)
E/StorageException(15931): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
E/StorageException(15931): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
E/StorageException(15931): at java.lang.Thread.run(Thread.java:762)
E/StorageUtil(15931): error getting token java.util.concurrent.ExecutionException: com.google.firebase.internal.api.FirebaseNoSignedInUserException: Please sign in before trying to get a token.
E/flutter (15931): [ERROR:topaz/lib/tonic/logging/dart_error.cc(16)] Unhandled exception:
E/flutter (15931): PlatformException(download_error, An unknown error occurred, please check the HTTP result code and inner exception for server response., null)
E/flutter (15931): #0 StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:547:7)
E/flutter (15931): #1 MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:279:18)
E/flutter (15931): <asynchronous suspension>
E/flutter (15931): #2 StorageReference.getData (package:firebase_storage/firebase_storage.dart:207:42)
E/flutter (15931): <asynchronous suspension>
E/flutter (15931): #3 Utils.downloadImage (package:flutter_alight/utils/utils.dart:88:108)
E/flutter (15931): <asynchronous suspension>
E/flutter (15931): #4 BusRouteItemState.downloadPois.<anonymous closure> (package:flutter_alight/UI/busRouteCards.dart:56:23)
E/flutter (15931): #5 _RootZone.runUnaryGuarded (dart:async/zone.dart:1316:10)
E/flutter (15931): #6 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:330:11)
E/flutter (15931): #7 _DelayedData.perform (dart:async/stream_impl.dart:578:14)
E/flutter (15931): #8 _StreamImplEvents.handleNext (dart:async/stream_impl.dart:694:11)
E/flutter (15931): #9 _PendingEvents.schedule.<anonymous closure> (dart:async/stream_impl.dart:654:7)
E/flutter (15931): #10 _microtaskLoop (dart:async/schedule_microtask.dart:41:21)
E/flutter (15931): #11 _startMicrotaskLoop (dart:async/schedule_microtask.dart:50:5)
W/NetworkRequest(15931): no auth token for request
I/System.out(15931): (HTTPLog)-Static: isSBSettingEnabled false
I/System.out(15931): (HTTPLog)-Static: isSBSettingEnabled false
E/StorageReference(15931): the maximum allowed buffer size was exceeded.
W/StreamDownloadTask(15931): Exception occurred calling doInBackground.
W/StreamDownloadTask(15931): java.lang.IndexOutOfBoundsException: the maximum allowed buffer size was exceeded.

Answer 1

Maybe the high number you picked isn't high enough for what you want to download.
1mb is 1024*1024 = 1048576, which is higher than what you set as max limit.
And your data could be larger than 1mb.
Check your data and set the max limit accordingly.