Get context in initstate flutter. From the FutureBuilder docs:.

Get context in initstate flutter initState(); context. Lets say you want to have a reusable class that navigates to a certain page of the app. I can use the provider values under the build context. Sep 7, 2019 · The problem is that you are initializing the instance of FileManagerBloc inside the BlocProvider which is, of course inaccessible to the parent widget. flutter_plugin_name import android. if you are looking for a different answer then create another question for that. Use bloc. It is a method of the State class that is used to initialize the state of a Stateful Widget. initState(); WidgetsBinding. Inside the initState (your 1st example) At this moment, your widget is being created. This will be called once so perform work which required to be performed only once, but remember context can't be used here, as widget state gets loaded only initState() work is done. navigator. Isn't there some way of reading the provider similar to context. annotation. 506. zero, {}) approach is using the behavior of Dart's event queue to delay execution until the next event loop iteration, at which point it is safe to access context since the widget is guaranteed to be built. initState] or the create method of providers like so: @override void initState() { super. I want to get the value and store in TextEditingController as an initial value. Jul 15, 2021 · I have JSON data like this: { "iduser": 3, "fname": "joni" } I want to display it on the home page. of(context). Is there a way to load async data on InitState method? 342. apiService . From the FutureBuilder docs:. app. You switched accounts on another tab or window. Using Context in Async Methods without Checking Validity: Avoid using context in asynchronous methods without verifying that the widget is still mounted. initState. Apr 28, 2021 · But I don't know how to access the state from within my void initState function. Dec 16, 2024 · Override this method to perform initialization that depends on the location at which this object was inserted into the tree (i. How to create number input field in Flutter? 5. its safe now because property mounted is true. How to initialize state using the Dec 19, 2024 · The technical storage or access is strictly necessary for the legitimate purpose of enabling the use of a specific service explicitly requested by the subscriber or user, or for the sole purpose of carrying out the transmission of a communication over an electronic communications network. during State. Follow these steps to achieve the result : 1. But there I calculate important things depending on the input. answered Mar 26, 2022 at 8:58. Mar 12, 2021 · This is because my MyCoolWidgets initState is not called again. e. Flutter Error: Could not find the correct ScopedModel. Instead, use it inside build() or after the widget has fully initialized. dependencies: flutter: sdk: flutter flutter_localizations: # Add this line sdk: flutter # Add this line intl: ^0. The builder method will run when the stream emits a new event and you can show different views based on the latest value from the stream. Apr 4, 2020 · I would try to a use a StatefulWidget and use initState() method. instance. videoData}) : super(key: key); @override _PlayerWidgetState createState() => _PlayerWidgetState(); } class Oct 27, 2019 · I'm working through understanding how the Provider package works with Flutter but confused on how listen:false works. addPostFrameCallback((_) => yourFunction(context)); } In this way , the yourFunction will be exectued as soon as the first frame of the widget loaded on the screen. of(context); but what if I want to access it somewhere else, say in initState() which Jun 20, 2019 · I find the localization procedure using the official Flutter localization plugin cumbersome. Jan 27, 2022 · Use Navigator. zero,() { _somethingFromApi = await ServiceProvider. shortestSide; double get screenHeightPixels => PlatformDispatcher. 223. 1 stable version, didUpdateWidget was only called after calling setState() to update the data displayed on the Widget. FlutterPlugin import io. In some cases, the context might not be fully initialized or available at the time the initState method is called, so By moving the initialization code to didChangeDependencies, you ensure that the context is available and ready to be used. So I try to access the value by calling a function using Provider. post(url);. myField. addObserver(this); } // This callback is invoked every time the platform brightness changes. Every widget in Flutter is associated with a context, which acts as a handle Oct 24, 2019 · We want to show an AlertDialog after some asynchronous processing such as network processes. I need a way to force it to refresh. otherwise, you are just wasting other people's time asking a question but seeking a different thing. of(context) flutter will always look up the widget tree to find the widget. initState performs the default implementation of the base class of your widget. read(clientProvider). StreamBuilder take a stream, and a builder method. Mar 8, 2021 · i have code like this from the internet, and my is not working: class _StartingAnimationState extends State&lt;StartingAnimation&gt;{ @override void initState() { Future. How to use data from Provider during initState in Flutter application. . push returns a Future that completes after calling // Navigator. Scaffold. So initState has access to the context of a Stateful Widget because between the creation of a State and the calling of initState, a BuildContext is already available to be passed. read<ProfileCubit>(). var brightness = MediaQuery. This means that a developer needs to use widgets to tell Flutter what to draw on the canvas. View. Nov 6, 2022 · The documentation of flutter_bloc says that:. platformBrightness; } Using WidgetsBindingObserver class _MyPageState extends State<MyPage> with WidgetsBindingObserver { @override void initState() { super. instance?. 17. You signed out in another tab or window. You could initialize them via the named constructor parameters like this: Aug 25, 2020 · I use StreamProvider to receive firestore data in my app. However, I am getting the following error: E/f Aug 19, 2019 · The problem here lies with the fact that context does not exist yet in initState as extensively explained by the other answers. initState should be the following: @override void initState() { super. That is the lifecycle you are referring to. physicalSize. The framework will call this method exactly once for each State object it creates. Yeasin The provider values are coming from the parent widget. devicePixelRatio; // Screen size in real pixels double get screenWidthPixels => PlatformDispatcher. of(context) method. context. Modified 8 days ago. May 2, 2019 · @Hosar I did that using this code: static BuildContext _context = HomeState(). whlie the process is in await, it Sep 17, 2022 · why unsafe to use context in initState is because the widget is unmounted. Md. pushNamed( context, routeName, arguments: <args>, ); Now, I need to access these argument's in the state's initState method as the arguments are needed to subscribe to some external events. NonNull; import io. Special attention is paid on the InheritedWidget which is one of the most important and less documented widgets. createState and before calling initState. of<FiltersBloc>(). Context is Undefined. We want to call something using context( Material Color, ModalRoute etc) before the Accessing the context in the initState method of a Flutter widget requires careful consideration. delayed because you need context. 1 for Listing notes from database. Get. flutter: No ancestor could be found starting from the context that was passed to flutter: BlocProvider. 2. How can I test if the user is signed in and if not route to another page Sep 17, 2021 · Flutter get context value from outside context. package com. storage. 2 for adding or editing note. initState(); May 22, 2021 · Ask questions, find answers and collaborate at work with Stack Overflow for Teams. I'm using InheritedWidget to inject a services object in my main. Explore Teams Nov 3, 2021 · So, I have made a function in Cubit Class it is to get data from API. 316. When a state object is no longer needed, the framework calls dispose() on the state object. However, it seems like it never gets called, I tried all fixes I found on here, but none of them works! Here is a simplified Aug 29, 2018 · The difference is (in the context of creating a State object) which has the initState() method:. 0; @override void initState() { super. Is there a method in the Widget Lifecycle to override for this purpose that gets called on rebuild? Like somewhere in between initState and when the build method is called from setState: May 15, 2019 · I have removed all method calls and work being done in the initState() method to exclude any possibility that it somehow calls itself. dart: final routes = { '/login' : (BuildContext context) => new LoginPage(), '/' : (BuildContext context) => new LoginPage() }; main. Flutter showDialog(context) in initState method. plugins. of(context) within the widget that has Scaffold inside the build method. Jul 21, 2021 · I was just making a simple note app to learn about Flutter Bloc. When the stateful widget is inserted into the widget tree for the first time, initstate is called. usually inside widget i call Blocbuilder to retrieve a string and then the string value i can pass to Bloc Jan 24, 2020 · EDIT 10/03/2022. initState() is called after the object is created and at this point you have access to the BuildContext or the StatefulWidget to which the State is attached to, respectively using the context and the widget properties. Desired behavior: When Home screen opens, app should check if users email verified, if it's not then should You can't get the context in the main method because it doesn't exist yet. width return the resolution (ex: 1080 / 2400) to get the same value as MediaQuery. Follow these steps: 1. context Jul 26, 2022 · Ask questions, find answers and collaborate at work with Stack Overflow for Teams. Force Flutter navigator to reload state when popping. flutter: 2. Jun 3, 2020 · The main purpose of initState is for initializing variables and it'll only be called when the widget gets destroyed, so as long as dispose method of the widget is not called your variable which was initialized through initState would be alive and you can use it in build method. ActivityAware import io. May 22, 2019 · Navigator. Apr 19, 2024 · Context is central in managing the state, accessing resources, and navigating the widget tree. Implementations of initState are required to start by calling super. Assuming you have different themes for different parts of your app (via nested Navigators, etc. initState(). 10. In the StreamProvider I have to pass context to listen to Mar 6, 2019 · Look at this code - widget to fetch data and display on list: class _MyEventsFragmentState extends State <MyEventsFragment>{ var events; @override initState(){ super. content. Reload to refresh your session. views. I tried to define Oct 28, 2019 · To do this in initState You need WidgetsBinding. clientName,this. You're going to need a way to initialize it without the context or initialize it during the initState of the root widget. instance! Oct 23, 2020 · Either create a bloc using default constructor, or get it from BlocProvider - both in initState(). Related. fetchProfile() } Wrap BlocListener for your widget tree. flutter. To get the context in the initState method, you can use the following approach: @override void initState {super. I wanna make the function automatically called when the page/screen is o Oct 19, 2019 · flutter: BlocProvider. Sep 19, 2019 · I get some data from an API and i want to use it in a DropdownButton. @override void initState() { super. They provide the MediaQuery. currentPage from within the initState function. The context you used comes from a widget above the BlocProvider. dart file like so void main() async { final sqflite. videoData to read in initState. of<InternetConnectionBloc>(context); //I am able to get the bloc but I would like to access it's current state's property } States: Mar 15, 2023 · Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand May 29, 2021 · Just after new page is created, I need to load webservice data (while loading is in progress, busy inducator should be displayed), then when loading done, show data. push instead. Nov 25, 2022 · On running the application for the very first time you will find the initState method getting triggered i. Dec 30, 2020 · In Flutter, you cannot call Scaffold. go('objects_list') context. where('uid', isEqualTo: uid) . didUpdateConfig, or State. I hope I can get some help regarding the access of the state. aspectRatio, which was accessible in initState(). Dec 15, 2020 · Learn how to add context in the initState method of the stateful widget. Accessing Flutter context when creating StatefulWidget. how to read it properly? my code is bellow : i Jun 2, 2018 · Flutter - This article covers the important notions of Widget, State, Context and InheritedWidget in Flutter Applications. go method but since it replaces at the top navigator, it Sep 13, 2020 · I have got the value stored in Documents directory in initState() using widget. of(context) under the hood is using the inherited widget, so cannot be called using context from initState. 37. If you call anything before super. Context import androidx. Some getters are already available, like the context. For example, override initState to configure animations or to subscribe to platform services. 5. arguments Demo pass arguments: {'instalation': "123 Oct 15, 2020 · I'm trying to use the simple state management described in the Flutter docs, using a ChangeNotifier, a Consumer, and a ChangeNotifierProvider. Rather than creating the FutureBuilder widget in the initState method, you could return the FutureBuilder widget in the overridden build method. I wrote some basic code using the usual Counter example from a new Flutter pr Mar 7, 2020 · In my test using Flutter 2. – Mar 7, 2020 · How to get context here? I keep getting null on my sharedPref because of context being null. May 13, 2019 · I'm confused with flutter, when I want to read arguments from statefulwidget (initstate) and access it into widget build, the variable is still null. you keep wanting an async value during a narrow window while initState is running, and won't be giving a chance for any other tasks to complete. arguments; call in initState, I get a runtime exception. registerWith(flutterEngine) MethodChannel(flutterEngine Jan 17, 2022 · Mixing answers from other users (considering that window is deprecated), you can use:. addPostFrameCallback((timeStamp) { isF = context. But, if you execute it again by invoking the class you will find the initState() method getting overridden and the next print statement will come to form the Build May 16, 2023 · Flutter get context in initState method. Called when this object is inserted into the tree. MODE_PRIVATE) override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) { GeneratedPluginRegistrant. 0. I know that helps with automatic cleanup of the Bloc but if you want to access it inside initState or didChangeDependencies then you have to initialize it at the parent level like so, Aug 30, 2019 · How can you get setState. Dec 23, 2022 · sorry i was misunderstand before, but scroll controller is use localy, its useless to use it as global variable and use everywhere. dart: Dec 26, 2022 · The documentation covers this example in detail. This method is called only once. Nov 14, 2024 · Using Context Before Widget Initialization: As mentioned, avoid using context inside initState or dispose. routes. addPostFrameCallback and ModalRoute. offUntil() // go to next named route and remove all the previous routes until the predicate returns true. 436. size Nov 30, 2023 · The framework associates State objects with a BuildContext after creating them with StatefulWidget. of inside [State. name) { case "Screen Name": return MaterialPageRoute(builder: (context) => ScreenName(args)); // TODO pass above argument here and get in the form of Apr 2, 2023 · initState is for sync initialization only. Enlight me please, what am I doing wrong here? @override void initState() { super. The association is permanent: the State object will never change its BuildContext. Mar 29, 2022 · I'm beginner of flutter and trying to make app now. initState() Called when new Widget is inserted into the tree. I wanna know how to be able to get a parameter from the previous screen and pass it in initState to my initialisation method c May 31, 2017 · Flutter get context in initState method. This means that you can't use asynchronous information (such as data that you still need to load from Firestore) in initState. The Future. For Example. In this comprehensive guide, we’ll explore every context usage in Flutter, providing detailed Nov 26, 2024 · Is there any way to get the global context of Material App in Flutter. The reason, so I believe, is that Locale tries to look up an InheritedWidget ancestor up in the tree, but the tree is just now being built (your widget is created during the parent widget's build) Mar 1, 2019 · Instead of subscribing to the stream in your initState, use a StreamBuilder widget. Where is context getting passed in? 0. When you click the TestButton, the countRefresh function is called and the variable count increases by 1. It doesn't exist because it hasn't yet been made a part of the widget tree. 10, you had WidgetsBinding. activity. For now I just can get the data if I pressed a button. physicalSize Jul 23, 2019 · You can also get the context in initState, try using a future with duration zero. instance . , widget). Do not use await in initState even though static analysis may allow you to. initState(); _internetConnectionBloc = BlocProvider. How to get the current context in Flutter? 1. read() outside the widget tree in flutter? Aug 28, 2021 · Problem is that "questionsList" and "_languageA" bool is not filed in initState , so I get null or initial value, only when I refresh state or reload List get filed and var get value So what I need to do in order to have initial filed variables before build method so user can see. myAppTitle - not exactly sleek Sep 8, 2023 · Get. if you could point me the reason why you need to use provider to hold scroll controller, maybe i can help with in spesific case Apr 5, 2020 · i curious how to call BlocProvider inside inistate that retrieve value from BlocBuilder. You can find some examples here. flutter: flutter: This can happen if: flutter: 1. Database database = await _openDatabase('db. snapshots(); Jan 31, 2023 · Rather than being translated into the equivalent OS widgets, Flutter user interfaces are built, laid out, composited, and painted by Flutter itself. Jun 12, 2018 · Best way is don't pass parameters to State class using it's constructor. Aug 12, 2020 · I've found several methods explaining how to get the location of a widget when pressing a button etc but whenever I try to get the location of a widget (during initState, didChangeDependencies, or Nov 15, 2018 · class NavigationRoutes { static Route<dynamic> generateScreenRoute(RouteSettings settings) { // TODO below we are able to get Arguments list Map args = settings. But now that this is being deprecated, I don't know how to get this. Is there a Dec 16, 2024 · BuildContext get context. Activity import android. g. until() // go to next route and remove all the previous routes until the predicate returns true. engine. Sep 2, 2019 · To complete @MohammadKhanAwan response, WidgetsBinding. pushnamed('/second') Second page has a textEditingController, and the Sep 9, 2021 · Im a new flutter developer and have just started using the initState(). constructor simply create a new State instance. Override this method to perform initialization that depends on the location at which this object was inserted into the tree (i. clientID); @override UserDataState createState() => UserDataState(); } class UserDataState extends State<UserData> { @override May 8, 2019 · You need a MaterialApp or a WidgetsApp around your widget. All it does is calling super. This is from the flutter for initState documentation: You cannot use [BuildContext. The future is firing again because you're creating it in the build method at the same time as the FutureBuilder. The reason, so I believe, is that getData tries to look up an InheritedWidget ancestor up in the tree, but the tree is just now being built (your widget is created during the parent widget's build). replace instead of . Aug 31, 2020 · To achieve what you have described you need to first make the navigation service using get_it. initState (); WidgetsBinding. class UserData extends StatefulWidget { final String clientName; final int clientID; const UserData(this. initState, State. to. Add videoData to the parameters of your widget and use widget. The future must have been obtained earlier, e. first. 0 # Add this line flutter: uses-material-design: true generate: true # Add this line flutter_intl: # Add this line enabled: true # Add this line class_name: I10n # Add this line main_locale: en # Add Feb 3, 2019 · void initState() { super. I am trying to get the context but it gives me the context of particular screen but I want the context of MaterialApp. Ask Question Asked 3 years, 3 months ago. However I need the provider values in the getHomeCampaigns function. flutter Navigator in initState, not working. Oct 4, 2020 · Trying to read a streamProvider inside initState, but failed. embedding. ActivityPluginBinding import io Dec 16, 2024 · void initState () . After adding note successfully when come May 23, 2021 · @override points out that the function is also defined in an ancestor class, but is being redefined to do something else in the current class. Mar 8, 2023 · Flutter get context in initState method. After that, calling a setState will rebuild the layout. There is a full tutorial and you can learn a lot. When i change the value of the DropdownButton its doesn't change on the screen. When you call . If I put the args = ModalRoute. Explore Teams Mar 5, 2022 · I'm new to flutter , so i'm not sure my way of coding is correct. Oct 10, 2022 · @override void initState() { super. 2. Since this thread became very popular I feel I need to add some comments. The member variable context can be accessed during initState but can't be used for everything. getSharedPreferences(“”,Context. delayed(Duration. example. Feb 20, 2021 · Flutter get context in initState method. I am refactoring my Flutter application code by adding Provider as a state management. To display a localized string I have to call AppLocalizations. Dec 21, 2020 · Flutter get context in initState method. means that the widget doesn't have place in the widget tree. read<ProviderForFiltter>(); }); // also itried this but it don't Jun 13, 2020 · Apparently, you cannot access current App Locale during initState (more concrete: before it completed). of(context) requires a valid context. The framework will call this method exactly once for each [State] object it creates. settings. initState(); // make sure this is called in the beggining // your code here runs only once Future. initState(); l_orders = xyz(); } Additionally, all of your members and your initState declaration are in build. But I Jul 12, 2022 · You can check the Readme of flutter_bloc. But what interests us in this case is the context in the entire application with the following command: Modular. d Jun 29, 2020 · The initState method is synchronous by design. class PlayerWidget extends StatefulWidget { final Map<String, dynamic> videoData; const PlayerWidget({Key? key, required this. If the widget should only be rendered once the data is available, you should not render it until that data has been loaded. of() called with a context that does not contain a Bloc of type FiltersBloc. Modified 5 years, Flutter get context in initState method. Not the context of particular screen. But, it can not wait. , context) or on the widget used to configure this object (i. Congratulations, you’ve just unlocked the power of Flutter’s initState! Throughout this journey, we've explored its role, its features, and how it plays a pivotal part in managing the state of Nov 24, 2021 · Edit: Based on the first reply be @miguel-ruivo, I learned that context can actually be accessed as a property on the State object, and therefore accessible from initState. delayed(Duration(seconds: 1), { WidgetsBinding. No Initialization: If you don’t use initState, any initialization that you might have intended to perform in initState will simply not happen. If you want to call showSnackbar inside initState, you have to call it inside a delayed function. You should try to use a Future inside the initState(). delayed(Duration(sec Jun 20, 2023 · Before Flutter 3. I'm trying to get data from firebase , and want to load it in initState(). Feb 23, 2022 · is better don't do use Provider in initState, but you can use Future. Jul 6, 2021 · I want to obtain a value from database in the initState method. Dec 18, 2019 · Getting provider with Provider. – Alexey Subbotin You signed in with another tab or window. Improve this answer. didChangeDependencies. Is there a way to load async data on InitState method? 255. arguments; switch (settings. Execution of initstate for every instance. removeRoute() // back repeatedly until the predicate returns true. May 28, 2021 · With the way Flutter works at the moment, async calls are scheduled after synchronous work, so initState and the initial layout will complete before getCoinData starts. The location in the tree where this widget builds. This behavior matches the description mentioned on the docs where the didUpdateWidget method is called whenever the widget configuration changes. zero= Duration(seconds: 0); initState calls when this object is inserted into the tree. For example, if you were fetching data or setting up a controller, that code would not execute. Load 6 more related questions Show fewer related questions Sorted by: Reset to default Jan 8, 2022 · So you get uid before it is set. 0 # Add this line get_it: ^7. So Sep 12, 2018 · A subclass of State can override initState to do work that needs to happen just once. of<RecorderStore>(context, listen: false); } Now as to why overriding didChangeDependencies is not a good idea: In the docs it says Apr 19, 2024 · In Flutter, context is an object that provides information about the current widget’s location in the widget tree. Wrapping Up: Mastering initState for Flutter Success. The framework associates State objects with a BuildContext after creating them with StatefulWidget. I have used . With this freedom of choice, Flutter needs to come up with its own system of building the UI: a widget tree. May 23, 2019 · initState; didChangeDependencies; のように進みます。 3のdidChangeDependenciesはinitStateの直後に呼ばれます。 ここでは、contextにアクセスが必要なInheritedWidget由来のinheritFromWidgetOfExactTypeにアクセスすることができます。 didChangeDependenciesの公式ドキュメントより、 Feb 1, 2024 · Flutter get context in initState method. Nov 4, 2019 · The Theme is usually an object that could be accessed from everywhere in your code to maintain uniform UI and consistency. initState that depends on the base class then this might cause problem. Flutter get context in initState method. Sep 24, 2020 · Ask questions, find answers and collaborate at work with Stack Overflow for Teams. initState also must complete in time for the first build, which should be within the first 60th of a second or there'll be dropped frames. Is it a good practice to use it to access Bloc A's data before adding an event for Bloc B? Mar 26, 2022 · Flutter get context in initState method; Share. addPostFrameCallback ((_) {if (! _checkConfiguration ()) {_showConfiguration (context);}});} Mar 27, 2023 · You can get the context from the BuildContext parameter of the build method or from a widget higher up in the widget tree that has a context, such as a Scaffold or a MaterialApp. I used the example below to test and learn how to call parent functions from child widget. private val CHANNEL = "samples. some page) with BlocProvider making it possible for that widget to access the bloc. orderBy('createdate') . ), 4 days ago · These examples give you a better understanding of initState and its usage in Flutter Widgets. You can listen to ProfileLoaded state here and get the user data immediately. To know more, join our Flutter Certification today. delayed method or one of the alternative approaches mentioned in this article, you can ensure that the context is fully initialized when you need it. I'm wrapping my carousel widget with a BlocProvider to read the CarouselBloc from the context and emit the events depending on the current page. Mar 1, 2022 · final properties are assigned either via named constructor parameters or at declaration, not in the initState method. My problem is that I can't get a hold a on valid conte Dec 31, 2019 · Using flutter_modular packages you can manage your application status, routes and many other things. for the 3rd, you may know about deactivate Feb 21, 2022 · Everything either a function or something else in widget build will run whenever you do a hot reload or a page refreshes but with initState it will run once on start of the app or when you restart the app in your IDE for example in StatefulWidget widget you can use: void initState() { super. The duration can be 0. platformDispatcher. window. Apr 11, 2022 · Flutter get context in initState method. read is most commonly used for retrieving a bloc instance in order to add an event within onPressed callbacks. instance. By leveraging the Future. initState(); final _store = Provider. 12. Dec 16, 2022 · When I started working with Flutter one of the most confusing things for me were inability to use methods that required BuildContext outside of flutter widgets. 1. Flutter - How to get context when not in a class with a build method. context; but when I pass _context in the constructor and run the app I get the error: Reading static variable '_context@25445118' during its initialization Apr 21, 2023 · addPostFrameCallback() If you search in Stackoverflow, one of the popular solutions to this issue is to implement addPostFrameCallback scheduling the callback at the end of the frame. of(context) has to always be called from a context that has a Scaffold as its ancestors. Jul 4, 2024 · Flutter get context in initState method. Sep 29, 2022 · Context is not accessible in initstate, try using didChangeDependencies life cycle method Flutter get context in initState method. Jun 24, 2019 · The problem comes from the context object not being available in initState. double get screenPixelRatio => PlatformDispatcher. Jul 31, 2023 · When I try to use the initState method like double anyvariable = 30. you need to learn how to ask a question for you to be able to get the right answer. initState(); // DO STUFF } Nov 9, 2022 · we are just answering your question How do I call method initState() from a stateless widget. I think it's because i use setState into an Nov 14, 2021 · initState() does not contain context and Duration. Create a navigation service Dec 16, 2024 · Called when this object is inserted into the tree. dev/battery" private val sharedPref = context. Jul 7, 2023 · context. Follow edited Oct 28, 2022 at 8:22. In app, there are 2 screens. I have 3 pages. Try to write your animals with get so it runs code written there only when you get animals but not on initialization: Stream<QuerySnapshot> get animals => FirebaseFirestore. readCounter() function. close() in dispose() if the bloc was created just for your widget using consturctor. it is called first and after that, the control enters the Build Context. initState(); // i tried this but it always give me errors that is isF null value Future. Explore Teams Aug 7, 2021 · How to get the context in a widget without a Build method 1 The argument type 'Widget Function(BuildContext)' can't be assigned to the parameter type 'Widget Function(BuildContext, Widget)'? Aug 6, 2023 · What is initState in Flutter? The word initState is made up of two words: the first word being init, which means initialize, and the other word being state. collection('animal') . My approach is load data inside Jul 19, 2023 · you can use didChangeDependencies lifecycle method instead of initState. Aug 18, 2019 · listen: false is necessary to be able to call Provider. Oct 22, 2024 · What Happens If You Don’t Use initState. Apr 22, 2018 · I see that I can access InheritedWidgets inside the build() method like this: final inheritedWidget = ChronoApp. You might want to use that class without a "context" argument. When calling 'showAlertDialog ()' from an external class, I want to call it without context. That's why it's recommended that you call initState in this fashion: @override void initState() { super. Nov 11, 2021 · The purpose of initState is to determine the state of the widget when it first renders. go('object_details) Make edits to the object; context. inheritFromWidgetOfExactType] from this method. of(context) in Flutter? Ask Question Asked 5 years, 4 months ago. You can easily access in State class using widget. Oct 15, 2019 · Now the super. So implement instead of initState use didChangeDependencies to call your fetchStudentsInfo(context) method Feb 20, 2021 · I have a stateful widget that has one method called in initialisation. didChangeDependencies(): This method is called immediately after initState on the first time the widget is built. Share. Mar 9, 2021 · ah, I get it, so then in my widget I can call final response = await context. 41. sqlite3'); runApp( Services( database: database, child: MyApp(), ), ); } Aug 17, 2018 · Flutter get context in initState method. pop on the Selection Screen. First page has a ElevatedButton with Navigator. Otherwise Oct 25, 2022 · See is there any difference between assigning value to the variable inside of initState or not in Flutter StatefulWidget? This will be run only once, when the class is created. This is valid solution if your goal is to use blocs that are not provided above your MaterialApp widget, but instead being declared somewhere down the widget tree by wrapping your widget (eg. What is Firebase Firestore 'Reference' data type good for? 213. its only can attach and listen to single scrollable, and you need to dispose it localy to avoid memory leaks. go('objects_list') When I return to 'objects_list' route from 'objects_details', it won't refresh and still shows the old data. So I'll paste in the relevant part: Future<void> _navigateAndDisplaySelection(BuildContext context) async { // Navigator. Apr 12, 2021 · l_orders is actually a String because you're awaiting it in initState. Previously I have created a model class below: usermodel. And I use lazy_load_scrollview package for the pagination in the image gridview. Aug 25, 2021 · Declare a list in your class: List<YourObject> list = []; Set your values in the list (better create a function that populates the list: fetchData() { List<YourObject Mar 14, 2019 · I have the following code: class RadialMenu extends StatefulWidget { @override _RadialMenuState createState() => _RadialMenuState(); } class _RadialMenuState extends Oct 16, 2018 · Apparently, you cannot access getData(context) during initState (more concrete: before it completed). mdgve lckwa qanh oscq yvn oab elput ejyl fgjyi vxmh