Flutter initstate called multiple times. To initialize data that needs to executed before build().
Flutter initstate called multiple times Dec 26, 2021 · Build can be called at any time multiple times. Dec 5, 2020 · initState will be called as many route segments as you have unless you override onGenerateInitialRoutes; build is called as many times as flutter thinks there's a change event. As you go back and forth between these two screens (pop homescreen, push homescreen) initState will be called exponentially more times. Sep 15, 2020 · I have three pages, A, B, C, and I navigate between them through a Drawer. I've checked if subwidgets or parents effect anything but I did not find out anything new. pushNamed" and going from the weather page to home page with a "Navigator. The main idea is to get users of my application to the good screen, depending on his role. My problem is that the setState function seems to be called multiple times. Jul 15, 2023 · First of all, subscribing/listening to anything inside the widget's build method is a bad idea in itself, because that method must not contain any side effects. My future is being called outside of build() in initState() - it's also wrapped in an AsyncMemoizer. When I checked i found that Streambuilder is called multiple times as I scroll down and back again up. 5 a1668566e5 Apr 29, 2019 · future builder running multiple times and page opening multiple at the same time. Relevant code: Apr 14, 2020 · First, my English is clearly not perfect : I will do my best ! I'm quite new with Flutter. flutter Jun 21, 2019 · Whenever, I have a Hero widget about a StatefulWidget, the State. But I'm not sure on how will I implement it in my code. 7. It seems like this is also the reason, why my items inside the PageView. g it will run initState and dispose each time the build method is called. Closed including the output of flutter doctor -v and a minimal reproduction of the issue. Sep 27, 2022 · I have come across a strange issue. Nov 17, 2019 · For some reason whenever I use setState((){}); in the function I pass in WidgetsBinding. You're doing something weird if it does. My goal is to get initState to be called only once (when the page is inserted in the widget tree), so that the state of each Apr 14, 2020 · When you call uploader. withData(ConnectionState. tools I/flutter ( 2680): is called after initState and whenever the dependencies change thereafter. has anyone found a fix for this? The Flutter Inspector shows that the widget is actually loading twice. As long as you don't do any complex logic or any API calls during the build stage it's not that bad. Excuse the ignorance i am new to Flutter. Why is initState() called twice? 5. Please re-open this issue. Tell me, if I change the value of a variable, how can I tell it and call methods in initState again without reloading the page? main Jul 11, 2020 · Flutter Init State Called Multiple Times. You switched accounts on another tab or window. Nov 30, 2020 · @pedromassango: We are seeing initState get called multiple times but only on iOS. Not expected as it should reuse the HomePage and not recreate it. Asking for help, clarification, or responding to other answers. In other words, each time you call notifyListeners(), your widget rebuilds, and the method is called again. Usually, you should create a subscription in the initState lifecycle and cancel it in the dispose lifecycle. listen it'll add a subscription each time, if you call that n times, n subscription will be added. Both methods a() and b() contain a call to setState(): void onButtonPressed() { Nov 21, 2022 · I'm having an issue with my widget running its FutureBuilder code multiple times with an already resolved Future. The framework will call this method exactly once for each [State] object it creates. Note: I am using the suggested solution in this issue to properly position the Scrollbar on iOS devices. Take the example counter app, and add a print statement in the initState and build methods. initState(); this. build(): This is a mandatory method and is called after initState() and didChangeDependencies(). All reactions. I am practicing on a course I did and I have the following scenario: I have a view where I consume a web service in the method getDataArray (FutureBuilde May 10, 2022 · When init called multiple times it just means that your widget tree changed. class Home ex Apr 19, 2022 · I have 3 page (all statefull widgets) : Home page; Weather page; Setting page; The things is when i'm going from home page to weather page with a "Navigator. However my initial HTTP call is being called multiple times. Mar 6, 2024 · Steps to reproduce Run the sample on the iOS platform. Thanks Jul 15, 2022 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. When I first run the app on the web (Chrome browser) everything is okay: the initState and the build method is called once Aug 19, 2017 · Steps to Reproduce Run the following and use the chevron arrows to switch pages. This is m Sep 12, 2018 · Uses of initState() initState() is a method of class State and it is considered as an important lifecycle method in Flutter. 437], locale de-DE) • Flutter version 1. Consider the below example where it is rendered 3 times at once: Flutter Init State Called Multiple Times. @override void initState() { super. pop", the next time i'm trying to go to the weather page from the home page, initState method is called again Nov 23, 2020 · The problem is build is beeing called 4 times. connectToSocket(); } void connectToSocket() { Initstate can and will be called multiple times, potentially loading your data twice etc. The framework will call this method exactly once for each State object it creates. pushNamed(context, '/screen_b'); }, Screen B code class ScreenB extends Aug 12, 2021 · You are creating a side effect when building the UI, and that is not desired. You should structure your application in a way that assumes build will be called on every frame - anything less is an optimization. Nov 25, 2022 · Flutter provides an inbuilt widget called “Offstage†, which is been used to hide or show any widget programmatically depending on user action/event. If I add the event in statefull widget's initState. Don't know where to add the event to prevent re-builds. push My current screens initState gets called again. Apr 14, 2022 · I solved it by setting an initState() as described here: Flutter FutureBuilder gets constantly called flutter-futurebuilder-gets-constantly-called. dart) then I get the is run 3 times home. Actually, I initially thought that the answer to my question might just be simple since I start the listen which doesn't end on listening even if I go to another screen. But am having challenges of flutter future builder is calling itself multiple times, I have implemented sugge Jun 27, 2022 · I have a page with a FutureBuilder and a custom widget with multiple FutureBuilders. , context) or on the widget used to configure this object (i. 138 14 info flutter. 1 How to nest tab in flutter? 1 Nov 25, 2021 · Steps to Reproduce. tools I/flutter ( 2680): initialization based on inherited widgets can be placed in the didChangeDependencies method, which 20:49:44. Jul 24, 2023 · It may be called multiple times during the widget’s lifecycle. Reload to refresh your session. It solved the Sep 5, 2019 · Only on iOS initState() is firing the same number of times as different tabs that have already been displayed. case (1) if i switch in tab like from tab A to B it's working fine. If our socket is connecting several times, maybe your method is triggered on a widget that is being re-renderized by state changes. 17763. To fix the issue, either you need to cancel previous subscription using cancel() method or you have to add the subscription only once (In your initState and cancel in your dispose method). Dec 23, 2020 · I am new to flutter and trying to build eCommerce mobile app using the woocommerce api. Jul 31, 2021 · The build method might get called multiple times and it shouldn't be considered a problem. Unlike the other questions on SO about this, my build() method isn't being called multiple times. But listener function called even when I click on the text field and sometimes even I clicked outside the text field. case (2) but if i'm go to tab A to C then initstate() of tab 'B' called two times . Mar 9, 2023 · This is a common issue that occurs because you have your request or method call inside the Consumer widget. Jul 28, 2022 · I have a page with initState method. Are you using Provider by any chance? You can simply use a FutureProvider instead of the StatefulWidget above: Feb 3, 2022 · I tested your code just now and it works fine. How to use multiple tab for single page in Flutter. As stated in the official documentation of FutureBuilder,. Which takes me back to 0th position in listivew. May 18, 2020 · Flutter get context in initState method. 0. May 25, 2021 · The initState of the third screen is called twice along with dispose. Used for initialization tasks. Nov 6, 2019 · Here userInfoDao is my local storage, I'm retrieving a flag from there which tells whether the user is already logged in or not and based on that the user is being routed to either login page or the activities page. We have a sample size of about 1,000. Cleaner ways 🛀. which rests my scrolling position in list. Example : To initialize data that depends on the specific BuildContext. Builder are called multiple times. If A class extends stateful widget and in build method _AState class having B class which extends Statefulwidget then for any setState method call in _AState the B class will get recreated and so is the Feb 12, 2019 · Steps to Reproduce. none, 'data of first future') new AsyncSnapshot<String>. result. You'll see that the state is only created once (at widget creation Dec 6, 2024 · Flutter’s widget lifecycle is a fundamental concept every Flutter developer must understand to build efficient and bug-free applications. My goal is to get Future after opening this page, but my FutureBuilders keep calling the Future twice. Nov 12, 2019 · But when I scrolled all the way down and back to top. getRoute() gets called even when I'm routed to the activities page, and because of that the activitesPage's initState is being Dec 13, 2023 · Salam, I'm a flutter developer, and I have in my application a TabBar, and in the TabBarView I have multiple widgets, these widgets count depends on a list, I loop the list and generate a widget each time, (it is the same widget) which means I use the same widget multiple times in the TabBarView but with different values I passed to it from the Jul 31, 2021 · The build method might get called multiple times and it shouldn't be considered a problem. So, each time your widget rebuilds, the method is triggered. Why is FutureBuilder called multiple times? 3. 2 at C:\Dev\flutter • Framework revision 7a4c33425d (2 weeks ago), 2019-04-29 11:05:24 -0700 • Engine revision 52c7a1e849 • Dart version 2. Hi, My FlutterBuilder widget runs many times so it connects the backend many times unintentionally. onGenerateRoute(RouteSettings(name:initialRoute))], initialRoute: initial, onGenerateRoute: app. Apr 8, 2019 · The first time we see A, it's fine it only runs once. When I first run the app on the web (Chrome browser) everything is okay: the initState and the build method is called once Jun 11, 2018 · Whenever I do Navigator. As per the documentation: The framework calls this method when this widget is inserted into the tree in a given BuildContext and when the dependencies of this widget change. Offstage Widget is a widget that lays the child out as if it was in the tree, but without painting anything, without making the child available for hit Jun 3, 2022 · This issue is most likely caused by the fact that you are not canceling the previously scheduled notifications before scheduling new ones. To solve this issue, move your method to the initState of your widget. Whenever I make the TextFormField to be focused and the keyboard pops up, the builder function of the ShellRoute will be called multiple times which makes me confused. But item builder works multiple times after loading data, i don't understand when it happen, sometimes when scrolling happen, sometimes after initial data load . build(): Called multiple times to render the UI. Flutter Init State Called Multiple Times. Using setState to update the vote count allows me to save the state of the field and persist it when I changes tabs. code global variable. On the other Jan 23, 2019 · Now when I navigate back to the login screen using the back button and then go back to the home screen initState will go off multiple times (this can be seen by the print statement I left in). In requests, I use the CodeEmailVerif. Flutter does a very good job of rebuild avoidance though, so widgets are only rebuilt when necessary. 2, on Microsoft Windows [Version 10. flutter Nov 1, 2019 · When i placed this function inside the initState function, The setter variable gets updated as long as I navigating to a new page inside pageview but when i go back to pages which i have already visited, the setter will have the value of the last page i have visited. To avoid multiple rebuilds, Intialise all your objects in local fields and only when all are ready, you can call setState once. initState() is called only Once and we use it for one time initializations. Aug 26, 2023 · If you observe that initState() is being called multiple times, there could be a few reasons: Hot Reload / Hot Restart: When you perform a Hot Reload or Hot Restart during the development process, the Flutter framework recreates the widget tree, including all the State objects. initState method is called three times instead of once when navigating to that page. initState(); subscription = Connectivity() . You could move your initialization logic to didChangeDependencies, however that might not be exactly what you want as didChangeDependencies can be called multiple times in the lifecycle of the widget. – Günter Flutter provides simpler solution. To avoid the future getting called, you need to save it in your state and "trigger" it inside the initState. Aug 26, 2023 · Understanding the widget lifecycle and how state changes trigger rebuilds is crucial for working with Flutter and can help in avoiding confusion around initState() or any other lifecycle methods being called multiple times. e. Builder are called multiple times, if I start swiping to the next page. When I open the page, I run requests in the initState method. The bottom (stateful) can be called any amount of times without changing. 20. And calling it inside initState is probalbly not a good idea. builder called multiple times Mar 22, 2022 · Flutter - Why is child widget's initState() is not called on every rebuild of Parent widget? 7 Flutter Init State Called Multiple Times. How can I prevent that? Nov 21, 2019 · I have setup a basic check using Connectivity's Readme on checking internet connectivity. Flutter Even if your code is working in the first place, you are not doing it correctly. results of case (1) flutter: A. This obviously only happens when the other page Jan 8, 2025 · The initState method is called only once when the widget is inserted into the tree, making it the best place to establish these connections without risking them being established multiple times. 1. results of case (2) flutter: A. put your code where your initialized code is called only once may be initState method or globally. Apr 18, 2023 · 6. Set the initalRoute to /home/1/2/3/4/5 and the onGenerateRoute will be called 7 times. onConnectivityChanged . I see that you are abusing seState in the build method if the same exists in the widget tree above that can be the root cause of why your state reinitializing every time. Aug 19, 2020 · that's probably because somewhere you use setState() and when you that your widget tree get re-build and the FutureBuilder call the future method again, to prevent this gain access to the future method in initState() by having a stateful widget like this May 3, 2020 · Hello I have the below code that I have a streamcontroller to listen value if app has internet connectivity but when I call listen (home. initState is enough for both data fetching and on layout rendered Nov 26, 2018 · If a method is listening to an action then for first time it gets hit once, then for next time if user gets back to the same page then the method gets hit twice and on third time its 3 times and increases every time. May 15, 2020 · I have an infinite list like below. . Importance of Calling SetState inside initState. Nov 25, 2021 · Steps to Reproduce. Flutter, problem using Flutter . The third time we make this cycle, it's called 3 times, etc Hopefully someone can point me in the right direction here as to what i am doing wrong. The circularloading indicator gets visible, in the first block, instead of already loaded items. 0-dev. However the onGenerateRoute gets called three times of which 2 times the default gets called (see the output). However, there are cases where it may appear that initState() is being called twice, which can be confusing. 0 (build 2. Here’s a quick summary of the lifecycle methods for Stateful widgets in Flutter: createState(): Called once to create the State object. listen called multiple times Switching between tabs initstate() called multiple times Listening of bloc getting called multiple times Flutter Setstate called multiple times (GestureDetector & PageView) Flutter Init State Called Multiple Times ListView. You can make it less terrible with: MaterialApp app; app = MaterialApp( onGenerateInitialRoutes: (initialRoute)=>[app. 4-hotfix. Switching between tabs initstate() called multiple times. As I learned so far, listening to the values of the pagecontroller with addListeners() does its job. Now I need the Future function to be executed when I press a button, to do this I have created a list to which I add the FutureBuilder when I press the button, but I have removed the initState(). Try to move it to a new function called at the end of initState: @override void initState() { super. 3. And I am not sure how to handle that. Is any way to restrict this behaviour. 138 15 info flutter. Aug 19, 2022 · You may be initializing the listener multiple times. initState() Called when new Widget is inserted into the tree. Jul 27, 2020 · A class extends stateful widget if we call setState from any method of _Astate only build method will get called no initState no createState. It is responsible for constructing May 31, 2021 · I have 2 screens Screen A Screen B I go from screen A to Screen B via the below code onTap: () { Navigator. Provide details and share your research! But avoid …. May 24, 2018 · TextField controlled controller. 0s [GoRouter] Full paths for routes: => /init => /debugFocus [GoRouter] setting initial location /init [GoRouter] Using MaterialApp configuration [GoRouter] going to /debugFocus flutter: Should be called only once! flutter: Debug Focus Page build() 32 flutter: Should be called only once! Aug 26, 2023 · Explanation of why Flutter initState is called twice In Flutter, the initState() method is called when the Stateful Widget is inserted into the widget tree and it is only called once during the lifecycle of the widget. To initialize data that needs to executed before build(). To prevent this, I cha Jul 22, 2020 · Hence only once the initState is called. May 22, 2019 · Alternatively, 20:49:44. tools I/flutter Sep 12, 2019 · It gets worse. Share Improve this answer May 16, 2019 · Switching between tabs initstate() called multiple times. The app uses Amplify and in initState Amplify is configured. Single Execution: A unique feature that defines the initState method is that it's called only once for every unique instance of a stateful widget. Bloc does not recognize ListBloc beeing in the context when fetching the bloc down the widget tree. Is there any way to overcome it? Note: Both the code within and outside the setState get called. 4s flutter: first called flutter: first called flutter: first called The correct question is: why initState() is called multiple times in StatefulWidget? Each Jun 11, 2018 · So, i think I found the answer in setState. Then we go to B, and then once we return to A, initState () is called twice. Feb 16, 2020 · I need to know which Tab is clicked. So it call FlashNewsCard build function multiple times as well as buildNewsCard function. How to fix this error? SubCategory StatefulWidget class subCategory extends StatefulWidget { final int RegId; Oct 14, 2021 · I have TextFormField with a text change listener attached to it. Mar 10, 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 19, 2020 · I noticed that my items inside my PageView. When I come back from detail view it again calls initState and everything again. 138 13 info flutter. It's how Flutter works. The build method should always return a widget and it shouldn't matter how many times is called. You signed out in another tab or window. I'm using flut May 12, 2019 · Each time it builds the HomePage it will not reuse it. setState(): Used to update the widget’s state and trigger a rebuild. Apr 19, 2023 · I have a problem with the flutter go_router ShellRoute. In Flutter, widgets go through a lifecycle that defines Mar 27, 2021 · But this time I need to take initState() of ActivityClass1 as I need to refresh few data on ActivityClass1. addPostFrameCallback(), that function gets called multiple times. 0. Subscribe to Apr 18, 2020 · in a nutshell: if you want one shot notification you use a FutureBuilder which has either "waiting" and "done" (with the final data) state - if you want multiple notifications you need a StreamBuilder which produces "waiting" and multiple "active" states with the up-to-date data – Oct 13, 2018 · 4. i have 4 tabs in my tab barA,B,C and D. Nov 14, 2020 · Flutter does not guarantee Widget. In six months I'm using Flutter I haven't encountered a single case where initstate would be called more than once. Sep 7, 2023 · Yes, the build method can (potentially) be called 60 times a second on a 60Hz device. On app launch Sep 19, 2019 · Switching between tabs initstate() called multiple times. Jan 31, 2019 · Lets say I have a method onButtonPressed() which calls method a() and then method b(). Nov 28, 2024 · The build() method can be called multiple times, so avoid putting heavy operations (such as complex calculations or API calls) inside it. onGenerateRoute); Jan 27, 2020 · Every time setState is called, it triggers a rebuild. 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. initState(): Called once when the State is created. There is no navigation in the app yet, just one screen. clear 1 Flutter - Input TextField gets cleared by TextEditingController but the entered message appears to be 'still alive' (not empty) You signed in with another tab or window. The root cause should be somewhere above the tree. instance. The future must be obtained earlier, because if the future is created at the same time as the FutureBuilder, then every time the FutureBuilder's parent is rebuilt, the asynchronous task will be restarted. May 14, 2019 · C:\Users\x\Projekte\flutter_test\notification\flutter_app>flutter doctor -v [√] Flutter (Channel beta, v1. , widget). Instead, perform such operations in methods like initState() or use state management solutions to handle them more efficiently. In my application: there are many Card widget in my ListView widget and user can click one of the cards The top future (stateless) gets called and triggered all the time (every 3 seconds in this example). Stateless widgets are immutable and don’t change their state during the lifetime of the widget. initState is enough for both data fetching and on layout rendered Apr 27, 2019 · In documentations it is stated that if your future changes, build method will always be called twice: If the old future has already completed successfully with data as above, changing configuration to a new future results in snapshot pairs of the form: new AsyncSnapshot<String>. e. 3. Flutter : why future builder run more than one time. Not really. When a user scrolls to the bottom it then loads more inventory by triggering another http call. Click on the TextField to open the keyboard. Everything works fine unless the back button is pressed. waiting Dec 26, 2021 · Build can be called at any time multiple times. Dec 15, 2020 · I have a flutter project that makes an http request to gather json of inventory items then render it on screen in a list view. 2. 5. Let's say that i have a simple stateful MyApp widget with a MaterialApp widget inside (the sample code is below). Therefore I added the SingleTickerProviderStateMixin, created a TabController field in my State and added a Listener (huge boilerplate IMHO). To solve this problem, you should cancel the previously scheduled notifications before scheduling new ones. 20:49:44. Calling it multiple times is a no-no. flutter: B. However, [didChangeDependencies] will be called immediately following this method, and [BuildContext. inheritFromWidgetOfExactType] can be used there. Then the app is sent to background. Even added keys but didn't make any difference. Override this method to perform initialization that depends on the location at which this object was inserted into the tree (i. While implementing a functionality, I noticed that all of my widgets functions are called continuously, resulting in high CPU consumption. dart bool _net = true; void initState(){ _checkNetwork(); . When going from page 1 to page 2: I/flutter (24852): index: 2 I/flutter (24852): index: 1 I/f Apr 18, 2020 · in a nutshell: if you want one shot notification you use a FutureBuilder which has either "waiting" and "done" (with the final data) state - if you want multiple notifications you need a StreamBuilder which produces "waiting" and multiple "active" states with the up-to-date data – Nov 26, 2018 · If a method is listening to an action then for first time it gets hit once, then for next time if user gets back to the same page then the method gets hit twice and on third time its 3 times and increases every time. Flutter build called multiple times. Sep 6, 2020 · In the first approach, we can stop the re-triggering of widgets by declaring Future object inside initState () method, which called only ones in the stateful widget lifecycle. Can anybody help me on this, i am quite new to flutter. Notice the console log printing 3 times for every page change. Jun 21, 2019 · Hero widget calls initState of child multiple times #34840. On bringing the app back in foreground initState is called again (which to my understanding should not be happening). All users are stored in a FireStore Database. Relevant parts of code : Screen 2. This causes the event fetching the list 4 times. listen((ConnectivityResult result) { // Got a new connectivity status! Feb 24, 2023 · The issue I have is that the NavigatorAuthSate class initializes once and so does the build do as well. build will be called the minimum number of times possible. 1 Feb 12, 2025 · Called when this object is inserted into the tree. I reworked my sample above to have a button that increments a counter on each tab respectively. addListener(() gets called multiple time after using the controller. Jul 24, 2023 · In Flutter, widgets can be classified into two main types: Stateless and Stateful. cddre zob vik yyoltaccv hxvptjd nszeyub ovc bkfh akpx zoorn jllr rixgu clw ufvhaqx hjl