stateful | Kotlin library which makes Android application development | Android library
kandi X-RAY | stateful Summary
kandi X-RAY | stateful Summary
Stateful is a Kotlin library which makes Android application development faster and easier. It helps you delete all the boilerplate code for saving instance state and lets you forget about saving and restoring your fragment's/activity's state.
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stateful Key Features
stateful Examples and Code Snippets
Lines of Code : 57
License : No License
Copyimport { ApolloLink } from 'apollo-link';
class OperationCountLink extends ApolloLink {
constructor() {
super();
this.operations = 0;
}
request(operation, forward) {
this.operations++
return forward(operation);
}
}
const lin class MySuperCoolActivity : Activity() {
private var importantNumber: Int = 3
private var importantNullableNumber: Int? = null
private var importantFlag: Boolean = false
///and many other super important properties
override fun implementation 'com.picsart:stateful:1.2.1'
def stateful_ops(self):
"""Returns the list of stateful ops in function definition.
Returns:
A list of (op.name, op.type) pairs.
"""
self._create_definition_if_needed()
return self._stateful_ops @GetMapping("/stateful")
public String getStateful() {
return helloStatefulWorld.getHelloWorld() + " called " + helloStatefulWorld.howManyTimes() + " times";
} def stateful(self, value):
self._stateful = value Community Discussions
Trending Discussions on stateful
QUESTION
I have added validator in TextField but validator is not working while submitting data. Save button saves the data with null value.
...ANSWER
Answered 2022-Mar-09 at 17:16The only possible reason is because of _addressType it's initial value is null
since it's a String? variable so if the user didn't select a "Delivery Slot"
the result of it after saving would be null,
what you need to do, it to check the value of _addressType if it's null or not then proceed to saving the form because your form doesn't check it if it's null or not.
QUESTION
I am getting an error when trying to save a model with data augmentation layers with Tensorflow version 2.7.0.
Here is the code of data augmentation:
...ANSWER
Answered 2022-Feb-04 at 17:25This seems to be a bug in Tensorflow 2.7 when using model.save combined with the parameter save_format="tf", which is set by default. The layers RandomFlip, RandomRotation, RandomZoom, and RandomContrast are causing the problems, since they are not serializable. Interestingly, the Rescaling layer can be saved without any problems. A workaround would be to simply save your model with the older Keras H5 format model.save("test", save_format='h5'):
QUESTION
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'info.dart';
void main() => runApp(MyApp());
class MyApp extends StatefulWidget {
@override
State createState() => MyAppState();
}
class MyAppState extends State {
List li = [
info(name: 'text1', length: 170, date: DateTime.now()),
info(name: 'text2', length: 175, date: DateTime.now()),
info(name: 'text3', length: 180, date: DateTime.now()),
info(name: 'text4', length: 180, date: DateTime.now()),
info(name: 'text5', length: 180, date: DateTime.now()),
info(name: 'text6', length: 180, date: DateTime.now()),
info(name: 'text7', length: 180, date: DateTime.now()),
info(name: 'text8', length: 180, date: DateTime.now()),
info(name: 'text9', length: 180, date: DateTime.now()),
];
void x (BuildContext ctx){
showModalBottomSheet(context: ctx, builder: (ctx){
return ListView.builder(
itemCount: li.length,
itemBuilder: (cx , index){
return Padding(
padding: EdgeInsets.all(10.0),
child: Card(
shadowColor: Colors.red,
elevation: 10.0,
color: Colors.blue,
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Column(
children: [
Row(
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: [
Text(
li[index].name,
style: TextStyle(color: Colors.white, fontSize: 20),
),
Text(
'${li[index].length}',
style: TextStyle(color: Colors.white, fontSize: 20),
),
],
),
Text(
'${li[index].date}',
style: TextStyle(color: Colors.white, fontSize: 20),
),
],
),
),
),
);
},
);
});
}
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'App name',
home: Scaffold(
appBar: AppBar(
title: Text('This is the App bar'),
),
body: Container(
padding: EdgeInsets.all(10.0),
height: double.infinity,
color: Colors.black,
),
floatingActionButton: FloatingActionButton(
child: Icon(Icons.add),
onPressed: () => x(context)
),
),
);
}
}
ANSWER
Answered 2021-Aug-03 at 13:16This is a common mistake that happens when using Inherited Widgets like MediaQuery. Now you may not be using it explicitly but from your description it seems that Flutters' showModalBottomSheet method maybe using it.
The error is telling you that no MediaQuery ancestor(i.e. WidgetsApp, CupertinoApp or MaterialApp) could be found above context. It means above this context:
QUESTION
Pardon the confusing title.
I have this code, which is accepted by GCC, Clang, and MSVC:
...ANSWER
Answered 2022-Jan-25 at 08:25The declaration auto helper() -> Writer; doesn't cause instantiation of Writer because the return type is not required to be complete.
The definition of helper() and with it the implicit instantiation of Writer are then in a complete-class context, which it seems the compilers assume means that the member function definition is located after the class definition and that the point-of-instantiation of Writer is then also after the class definition.
I don't know whether this is actually how it is supposed to work or which paragraph in the standard would specify this behavior, though.
Reading the tag only in the body of another (static) member function causes the read to also be located in a complete class context, i.e. after the class definition in the above interpretation, which is why it works again.
QUESTION
Error:
...ANSWER
Answered 2022-Jan-20 at 06:50You have typo. In place where you declare variable there is answers field, but you are accessing answer field.
Change following line and see again.
QUESTION
I have created a page in which there is search bar and then the listview builder which is building items of List coming from provider class. When I tap on search bar, the keyboard appears ,suddenly disappears and page refreshes. when page is refreshed, first it shows circularprogressIndicator and then regular ListView.builder.
Kindly Help.
Thank you in advance!
ANSWER
Answered 2022-Jan-16 at 07:55future builder trigger on every build. so when you click on searchBox the keyboard changes screen size and Expanded rebuild futureBuilder.
Replace below part of future Builder
QUESTION
I'm considerably new to Flutter and I'm to build a Messenger Chap App on Flutter, and I face the issue of "LateInitilization: Field 'searchSnapShot' has not been initialized. Following is the snippet of code that is causing the issue:
...ANSWER
Answered 2021-Sep-24 at 04:08Try this please
QUESTION
I am trying to use the video_player, but I am getting the below error. I have also added an MRE (minimum reproducible example).
I have used an emulated Pixel 4, an emulated Pixel 4 XL, and an emulator Pixel 5 with the Android Studio Beta, but none of them worked.
The below error was when I was using a Pixel 4 XL, but the error was the same with all of them.
Error:
...ANSWER
Answered 2022-Jan-11 at 08:53It can be a bug of that Flutter package, indeed. Have you tried to create an issue in GitHub of that package?
Secondly, during my development, I see several times when emulators just fail and real devices always work. The solution I used is - simply to do not test them on simulators. Real users never use simulators, aren't they?
It can be a bug of the library when running on x86 arch (the arch simulators use). Then, nobody with a real device (arm arch) will ever see the bug.
Thirdly, what about trying to use "cloud real devices" to test whether they work on real Pixel devices that you are worried about. There are many platforms that host some real devices and you can connect to them via a webpage and test your app.
QUESTION
From the well-known C++ coroutine library (search "Don't allow any use of co_await inside the generator coroutine." in the source file generator.hpp), and from my own experiments, I know that a coroutine using co_yield cannot use co_await meanwhile.
Since a generator using co_yield must be synchronous, then, what's the advantage of using co_yield over a simple stateful lambda?
For example:
...ANSWER
Answered 2021-Dec-30 at 19:16For trivial generators with minimal internal state and code, a small functor or lambda is fine. But as your generator code becomes more complex and requires more state, it becomes less fine. You have to stick more members in your functor type or your lambda specifier. You have bigger and bigger code inside of the function. Etc.
At the most extreme, a co_yield-based generator can hide all of its implementation details from the outside world, simply by putting its definition in a .cpp file. A stateful functor cannot hide its internal state, as its state are members of the type, which the outside world must see. The only way to avoid that is through type-erasure, such as with something like std::function. At which point, you've gained basically nothing over just using co_yield.
Also, co_await can be used with co_yield. Cppcoro's generator type explicitly hoses it, but cppcoro isn't C++20. You can write whatever generator you want, and that generator can support uses of co_await for specific purposes.
Indeed, you can make asynchronous generators, where sometimes you can yield a value immediately, and sometimes you can schedule the availability of a value with some asynchronous process. The code invoking your async generator can co_await on it to extract values from it, rather than treating it like a functor or an iterator pair.
QUESTION
Why should I use debugFillProperties in the stateful widget in Flutter? I have seen Some flutter Built-in stateful widgets Like Slider using this method.
I went through Flutter Docs given here. I'm still not able to understand the practical usage of debugFillProperties. When or why use it?
I tried It in My example code, Still Not able to understand. I did not find any docs or relevant information was found about this method in Flutter.
...ANSWER
Answered 2021-Oct-04 at 08:13By overriding the debugFillProperties function, we can show the current value of a variable (state) in the Details Tree
example: without overriding this method:
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