The HN reader app developed live on The Boring Flutter Development Show
Home Page: https://www.youtube.com/playlist?list=PLjxrf2q8roU3ahJVrSgAnPjzkpGmL9Czl
License: BSD 3-Clause "New" or "Revised" License
A HackerNews reader app in Flutter.
If the Article API gets changed, you should run:
$ flutter packages pub run build_runner build --delete-conflicting-outputs
For faster switching between versions of Flutter, this app uses the community tool called fvm.
You don't need to use it, but if you want to, then install the tool
and then run everything with fvm (e.g. fvm flutter build). Read the tool's
README for more information.
New to dart/flutter. I apologize for creating a PR to ask questions.
Are the close() methods of HackerNewsBloc/PrefsBloc ever executed actually?
Regardless, is it necessary to close BehaviorSubjects in this use case?
I'm at b5cca6d212aa8920bc93c81ac18d213f8348d06f.
I run $ flutter -v pub run build_runner build.
It seems stuck.
[INFO] 2m 6s elapsed, 1/15 actions completed.
[INFO] 2m 7s elapsed, 1/15 actions completed.
[INFO] 2m 8s elapsed, 1/15 actions completed.
[INFO] 2m 9s elapsed, 1/15 actions completed.
[INFO] 2m 10s elapsed, 1/15 actions completed.
[INFO] 2m 11s elapsed, 1/15 actions completed.
[INFO] 2m 12s elapsed, 1/15 actions completed.
[INFO] 2m 13s elapsed, 1/15 actions completed.
[INFO] 2m 14s elapsed, 1/15 actions completed.
[INFO] 2m 15s elapsed, 1/15 actions completed.
[WARNING] No actions completed for 15.1s, waiting on:
- built_value_generator:built_value on test/json_test.dart
- built_value_generator:built_value on test/widget_test.dart
- built_value_generator:built_value on lib/main.dart
- built_value_generator:built_value on lib/src/article.dart
- built_value_generator:built_value on lib/src/widgets/search.dart
.. and 9 more
[INFO] 2m 17s elapsed, 1/15 actions completed.
[INFO] 2m 19s elapsed, 1/15 actions completed.
[INFO] 2m 20s elapsed, 1/15 actions completed.
[INFO] 2m 21s elapsed, 1/15 actions completed.
[INFO] 2m 22s elapsed, 1/15 actions completed.
[INFO] 2m 23s elapsed, 1/15 actions completed.
[INFO] 2m 24s elapsed, 1/15 actions completed.
I tried to implement isolate to update firestore database. But I got Null check operator error. Can't firebase use on secondary isolate?
Error
I/flutter ( 9135): [Null check operator used on a null value, #0 MethodChannel.binaryMessenger (package:flutter/src/services/platform_channel.dart:142:86)
I/flutter ( 9135): #1 MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:148:36)
I/flutter ( 9135): #2 MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:331:12)
I/flutter ( 9135): #3 MethodChannel.invokeListMethod (package:flutter/src/services/platform_channel.dart:344:41)
I/flutter ( 9135): #4 MethodChannelFirebase._initializeCore (package:firebase_core_platform_interface/src/method_channel/method_channel_firebase.dart:30:37)
I/flutter ( 9135): #5 MethodChannelFirebase.initializeApp (package:firebase_core_platform_interface/src/method_channel/method_channel_firebase.dart:77:13)
I/flutter ( 9135): #6 Firebase.initializeApp (package:firebase_core/src/firebase.dart:42:47)
I/flutter ( 9135): #7 Worker.readUpdate (package:yello/services/chatMessageService.dart:202:20)
I/flutter ( 9135): #8 Worker._isolateEntry.<anonymous closure> (package:yello/services/chatMessageService.dart:214:15)
I/flutter ( 9135): #9 Worker._isolateEntry.<anon
I/chatty ( 9135): uid=10206(u0_a206) 1.ui identical 1 line
I/flutter ( 9135): [Null check operator used on a null value, #0 MethodChannel.binaryMessenger (package:flutter/src/services/platform_channel.dart:142:86)
I/flutter ( 9135): #1 MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:148:36)
I/flutter ( 9135): #2 MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:331:12)
I/flutter ( 9135): #3 MethodChannel.invokeListMethod (package:flutter/src/services/platform_channel.dart:344:41)
I/flutter ( 9135): #4 MethodChannelFirebase._initializeCore (package:firebase_core_platform_interface/src/method_channel/method_channel_firebase.dart:30:37)
I/flutter ( 9135): #5 MethodChannelFirebase.initializeApp (package:firebase_core_platform_interface/src/method_channel/method_channel_firebase.dart:77:13)
I/flutter ( 9135): #6 Firebase.initializeApp (package:firebase_core/src/firebase.dart:42:47)
I/flutter ( 9135): #7 Worker.readUpdate (package:yello/services/chatMessageService.dart:202:20)
I/flutter ( 9135): #8 Worker._isolateEntry.<anonymous closure> (package:yello/services/chatMessageService.dart:214:15)
I/flutter ( 9135): #9 Worker._isolateEntry.<anon
Full Code
class Worker {
SendPort _sendPort;
Isolate _isolate;
final _isolateReady = Completer<void>();
Worker() {
init();
}
Future<void> get isReady => _isolateReady.future;
void dispose() {
_isolate.kill();
}
Future<void> fetch(ChatModel model) async {
_sendPort.send(model);
}
Future<void> init() async {
final receivePort = ReceivePort();
final errorPort = ReceivePort();
errorPort.listen(print);
receivePort.listen(_handleMessage);
_isolate = await Isolate.spawn(
_isolateEntry,
receivePort.sendPort,
onError: errorPort.sendPort,
);
}
void _handleMessage(dynamic message) {
if (message is SendPort) {
_sendPort = message;
_isolateReady.complete();
return;
}
if (message is bool) {
return;
}
throw UnimplementedError("Undefined behavior for message: $message");
}
static Future<void> readUpdate(ChatModel model) async {
await Firebase.initializeApp();
final FirebaseFirestore _db = FirebaseFirestore.instance;
return _db.collection('chats').doc(model.chatFieldId).collection('messages').doc(model.messageId).update({'readStatus': 'R'});
}
static void _isolateEntry(dynamic message) {
SendPort sendPort;
final receivePort = ReceivePort();
receivePort.listen((dynamic message) async {
assert(message is ChatModel);
try {
await readUpdate(message);
sendPort.send(true);
} finally {
//client.close();
}
});
if (message is SendPort) {
sendPort = message;
sendPort.send(receivePort.sendPort);
return;
}
}
}Compiler message:
lib/src/favorites.g.dart:137:8: Error: The return type of the method '$FavoritesTable.validateIntegrity' is 'bool', which does not
match the return type, 'VerificationContext', of the overridden method, 'TableInfo.validateIntegrity'.
- 'VerificationContext' is from 'package:moor/src/runtime/structure/error_handling.dart'
('file:///Users/jintian/development/flutter/.pub-cache/hosted/pub.flutter-io.cn/moor-1.5.1/lib/src/runtime/structure/error_handling.d
art').
Change to a subtype of 'VerificationContext'.
bool validateIntegrity(Favorite instance, bool isInserting) =>
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