In Short, Provider is like a way to use an InheritedWidget.
For Example: If any data gets changed and need to updated into the App UI, then Instead of rebuilding full hierarchy of Widgets, we can simply Update value of Flutter Provider Consumer Widgets.
Below Example is by using setState() method
Using setState method is good when there is Small UI data change.
Normally by making us of setState() method whole application UI gets rebuilt and continuously keeps rebuilding full application which is not a good sign to be a Flutter developer and this may give lots of load to the flutter engine (which may led to app performance issue).
As you can see in above screenshot: i have made use of Count timer to decrement a variable value then simple display the updated variable value into the UI
Here Count down will be from 10 – 0, and every 1 second decrement the value by 1 and as value gets updated, whole app UI gets rebuilt for 10 time
You can view the logcat print statement above.
For a simple application which has very few data change/update then, it’s fine to make use of setState() method, but it is better to make use of other method like flutter provider when it comes for complex application build.
Flutter provider tutorial and Explaination
In provider we have 3 important part that are :
ChangeNotifierProvider : which creates the instance of your data, as you can see in above diagram changeNotifierProvider will create instance of DataModel class
Update: from any where inside your page you want to update the value, you just get instance of that provider and manupulate that value as per and then as soon as the value is been change, data model will notify all the Flutter Consumer widgets.
And then once the consumer get Notified about the data change, you can update your widget as per.
Flutter provider tutorial with Example
Step 1: Creating a new Flutter Project
Step 2: Open pubspec.yaml file and add the dependencies
provider: ^4.3.2+2 #latest version check official site
Step 3: Create a new Dart file in lib directory
After adding dependencies, then create a new dart file in lib directory on your flutter project
then name it as “Timer_Data.dart”
class Timer_Data extends ChangeNotifier
int _time_remain_provider=11; // initial value of count down timer
int gettime_remain_provider() => _time_remain_provider; //method to get update value of variable
_time_remain_provider --; //method to update the variable value
In above source we have a variable that holds initial value,
then there is a method that gets updated value of variable
and then it has updateRemainingTime() method that will decrement the value by -1.
Step 4: Create one more dart file for UI Design (Homepage.dart)
Hi, Guys Welcome to Proto Coders Point, In this android tutorial, we will learn about android jetpack compose and will build a simple app using state management (MutableState) in jetpack that will update UI when State or Variable value changes on button click.
Android Jetpack Compose tutorial – A declarative UI Toolkit
What is Android Jetpack Compose?
A Jetpack compose is a modern toolkit using which we can build a Native android UI Application, It’s based on the declarative programming model, so all you need is to simply describe how your app UI should look like and the compose will take care of the rest of app state changes, and UI gets Automatically Changed.
What do we mean by declarative UI?
Declarative UI means the developer can design the UI by the means of Programming Code, This Android Jetpack compose is been inspired by React.js and Flutter development.
Why Compose Jetpack?
Easy way to Explain you :
Whenever we design a screen in android we are making use of XML to create UI design & then giving functionality to the UI using code in Java or kotlin.
Fewer Lines of Code
No XML Needed
When we use Android JetPack compose there is no need to write XML UI Files, we just need to write the whole UI Code in Kotlin language itself.
Building Block of jetpack
If you are designing a UI using jetpack compose, then you are basically writing function by making use of @Composable,
Then to check the preview display of your android application UI design in the android studio preview section you just need to add @Preview on top of @Composable.
A Composing is a function whatever we write in it get printed on the mobile screen as a widget view.
Note: As in Flutter all everything is a widget likewise in android jetpack every view is a widget
For Now, Android-Studio Stable version does not support Jetpack Compose so you need to make use of the Android Studio Canary version
Hi Guys, Welcome to Proto Coders Point, In this Flutter tutorial we will discuss on flutter swiper Library
What is flutter swiper? how to implement swiper in flutter?
A Swiper in simple words is a modern touch slider using which user of mobile application can slide any view like image Slider.
Swiper is been used on websites and mobile applications.
In Flutter there is a best library to integrate Swiper, with can be customized with multiple layouts and infinite loop, and as said in official library site that is compatible with Both Android and iOS.
Let’s begin implementation of this flutter library.
Installation of dependencies
Add library in pubspec.yaml file
flutter_swiper: ^1.1.6 #add this line
Hi Guys, Welcome to Proto Coders Point, In the article post we will discuss on 5 best programming books for beginners by which you can teach yourself and learn to think like a programmer and crack can any coding interview.
As any beginner in the Coding field, It’s very important to have a basic knowledge of coding/programming. Since there are many books that are good and available to buy from Amazon or Flipkart and this company even provides read online books for free, But selecting the right book seems to be difficult to deal with.
So Here i am with some top coding books for beginners, which all programmers must have read:
5 Best Coding Books – Programming Books for Beginners
#1. Think Like a Programmer – An Introduction to Creative Problem Solving
Anton Spraul says : The real challenge of programming isn’t learning a language’s syntax—it’s learning to creatively solve.
The Author V.Anton Spraul his main focus is on how to think like a programmmer, this unique book for coders will break down the way any programmers tends to solve coding issues. In this book there is a problem solving methods where a programmers can test their programming skill and knowlegde.
This book will help you in learning the systematic and Clean Code: Usually when beginner code any function it will work perfectly but then the same code is been sent to other programmer he might be difficult for him to understand because the code is full of messy and with no proper comments – this book Clean Code will help you to teach yourself how to write clean code.