A complete Android UI development guideline with Jetpack Compose is described here.
Reference link:
https://developer.android.com/jetpack/compose/documentation
Jetpack Compose is a modern toolkit for building native Android user interfaces that simplifies and accelerates development with less code. It uses composable functions to define the UI programmatically based on data dependencies rather than focusing on the construction process. Jetpack Compose provides Material Design elements out of the box and uses a hierarchical layout system to compose functions within other functions to build the UI. It also supports features like lists, grids, animations and modifiers to customize the UI.
Jetpack Compose is a modern UI toolkit for Android that uses a declarative and reactive programming model built with Kotlin. It aims to simplify UI development by allowing developers to describe how the UI should look rather than how to construct it. Composable functions are annotated and can only call other composable functions to build UI components in a declarative way. State and navigation can be managed declaratively in Compose as well through state management and backstacking capabilities.
Jetpack Compose is a new declarative UI toolkit from Google that uses Kotlin to simplify and accelerate Android UI development with less code. It uses a declarative paradigm where the UI and its state are defined together, rather than imperatively updating views. Jetpack Compose is currently in beta but aims to provide a modern way to build user interfaces in Android with composable UI components instead of traditional screens.
Jetpack Compose is a new UI toolkit for Android that uses a declarative paradigm where the UI is defined as a function of app state, rather than as interacting objects. It allows defining UI using Kotlin instead of XML layouts. Compose provides composable functions to build UI in a declarative way and allows observing state changes. However, Compose is still in early development and requires unreleased versions of Android Studio, Kotlin, and the Android Gradle plugin to use.
Jetpack Compose is a Declarative UI toolkit written in 100% Kotlin. What is Declarative UI? Why should we use it? We will talk about data flow and the benefits of Declarative UI. Then we’ll show the way to setup Jetpack Compose, write some basic samples and let it works with the MVVM architecture.
Jetpack Compose is Android's new modern toolkit for building native UI using less code and powerful Kotlin APIs. It is inspired by React, Litho, Vue.js and Flutter but written completely in Kotlin. Compose aims to simplify and reduce code by separating concerns through a declarative paradigm instead of the traditional imperative view approach. It uses a gap buffer data structure to efficiently manage changes to UI over time in a reactive way. While still in developer preview, Compose shows promise for improving the Android UI development experience.
Jetpack Compose is a modern toolkit for building native Android user interfaces that simplifies and accelerates development with less code. It uses composable functions to define the UI programmatically based on data dependencies rather than focusing on the construction process. Jetpack Compose provides Material Design elements out of the box and uses a hierarchical layout system to compose functions within other functions to build the UI. It also supports features like lists, grids, animations and modifiers to customize the UI.
Jetpack Compose is a modern UI toolkit for Android that uses a declarative and reactive programming model built with Kotlin. It aims to simplify UI development by allowing developers to describe how the UI should look rather than how to construct it. Composable functions are annotated and can only call other composable functions to build UI components in a declarative way. State and navigation can be managed declaratively in Compose as well through state management and backstacking capabilities.
Jetpack Compose is a new declarative UI toolkit from Google that uses Kotlin to simplify and accelerate Android UI development with less code. It uses a declarative paradigm where the UI and its state are defined together, rather than imperatively updating views. Jetpack Compose is currently in beta but aims to provide a modern way to build user interfaces in Android with composable UI components instead of traditional screens.
Jetpack Compose is a new UI toolkit for Android that uses a declarative paradigm where the UI is defined as a function of app state, rather than as interacting objects. It allows defining UI using Kotlin instead of XML layouts. Compose provides composable functions to build UI in a declarative way and allows observing state changes. However, Compose is still in early development and requires unreleased versions of Android Studio, Kotlin, and the Android Gradle plugin to use.
Jetpack Compose is a Declarative UI toolkit written in 100% Kotlin. What is Declarative UI? Why should we use it? We will talk about data flow and the benefits of Declarative UI. Then we’ll show the way to setup Jetpack Compose, write some basic samples and let it works with the MVVM architecture.
Jetpack Compose is Android's new modern toolkit for building native UI using less code and powerful Kotlin APIs. It is inspired by React, Litho, Vue.js and Flutter but written completely in Kotlin. Compose aims to simplify and reduce code by separating concerns through a declarative paradigm instead of the traditional imperative view approach. It uses a gap buffer data structure to efficiently manage changes to UI over time in a reactive way. While still in developer preview, Compose shows promise for improving the Android UI development experience.
Introduction to React in combination with Redux. Redux helps you to develop applications in a simple way while having features like time-travel available during development.
Jetpack Compose is Google's new declarative UI toolkit for Android that aims to simplify building user interfaces. It uses composable functions to build up UI elements in a declarative way. Composables can update reactively in response to changes in state data models. This allows building UIs as simple as printing lines of code. Compose principles include treating UI as functions, using composable building blocks, and implementing a top-down data flow from state models to views through composables. The speaker demonstrates a simple counter app built with Compose.
Jetpack Compose is the new Android UI framework that allows you to create rich user interfaces in a declarative way using Kotlin language. In this presentation, it will be demonstrated how to take the first steps with Compose, learn its main concepts and understand how to be prepared for this change of paradigm on the front-end development of native Android applications.
This document provides an introduction to React for developers. It explains that React is a JavaScript library for building user interfaces developed by Facebook. It then covers key React concepts like components, props, state, rendering, and the virtual DOM. It also discusses tools and patterns for architecting React apps like Flux, Redux, routing, internationalization, and async logic. Finally, it recommends designing state carefully, using standards like Flux Standard Action, avoiding side effects in reducers, and leveraging tools like React DevTools.
State is managed within the component in which variables declared in function body. State can be changed. State can be accessed using “useState” Hook in functional components and “this.state” in class components. Hook is a new feature in react. To use this expression it’s essential to have good understanding of class components. State hold information that used for UI by browser.
https://www.ducatindia.com/javatraining/
React is a JavaScript library for building user interfaces. It was created by Facebook and is best for building dynamic websites like chat applications. React uses a virtual DOM for efficiently updating the view after data changes. Components are the building blocks of React and can contain state and props. The document provides an example of a simple component class and demonstrates how to add state and props. It also includes links to example code and MicroPyramid's social media profiles.
When developing applications we have a hard time managing application state, and that is okay because managing application state is hard. We will try to make it easier using Redux.
Redux is predictable state management container for JavaScript applications that helps us manage our state while also making our state mutations predictable.
Through the presentation and code, I will show you how I solved my state problem with Redux in React application.
In this presentation, Prashant Sharma of Valuebound has talked about ReactJS - a JavaScript library for building user interfaces. Check out the agendas to know what is there for you.
----------------------------------------------------------
Get Socialistic
Our website: http://valuebound.com/
LinkedIn: http://bit.ly/2eKgdux
Facebook: https://www.facebook.com/valuebound/
Twitter: http://bit.ly/2gFPTi8
In this tutorial on Kotlin Jetpack, we will learn why Jetpack compose, What is Kotlin Jetpack compose, and How does compose works?. We will also learn about Composable function, Layouts, and material design. At last, we will have a look at the List and animations.
What is Kotlin Jetpack compose?
Why Jetpack compose?
How does the compose work?
Composable function
Layouts
Material design
List and animations
Explanation of the fundamentals of Redux with additional tips and good practices. Presented in the Munich React Native Meetup, so the sample code is using React Native. Additional code: https://github.com/nacmartin/ReduxIntro
A short introduction to the new set of tools offered to Android developers - Android Jetpack. Talk held at Leeds Mobile focusing on the ViewModel and the LiveData compoments availabe in Jetpack.
This document provides an overview of React and Redux. It introduces React as a component-based library for building user interfaces using JavaScript and JSX. Key aspects of React include its lifecycle methods, use of a virtual DOM for fast updates, and functional stateless components. Redux is introduced as a state management library that uses a single immutable store with actions and reducers. It follows the Flux architecture pattern without a dispatcher. Hands-on demos are provided for key React and Redux concepts. Resources for further learning are also listed.
React Hooks were introduced in React 16.8 to add state and side effects to function components by replacing class components. Common hooks include useState for managing component state, useEffect for handling side effects like data fetching, useCallback for creating memoized functions, and useRef for creating references that don't trigger re-renders when mutated. Hooks allow extracting logic into custom reusable hooks and following a few simple rules helps avoid bugs.
This document provides an overview of React including: key features like components, JSX, and unidirectional data flow; installation and technical requirements; the component lifecycle; differences from Angular; popular companies using React; and links to examples. It covers React concepts like states, props, and events. Questions from attendees are invited at the end.
The document discusses Jetpack Compose, a declarative UI toolkit for Android. It covers topics such as:
- Thinking in Compose by describing what the UI should look like, not how to build it
- Creating composable functions that can run in any order and in parallel
- Using the Compose toolkit which includes MaterialTheme, Scaffold, and Surface
- State management with MutableState and remember to control the UI
- Ensuring composables are side-effect free and may run frequently on recomposition
React is a library for building user interfaces using components. It uses a virtual DOM for rendering components, which are pieces of UI defined as classes or functions. Components receive data via props and local state, and can be nested to build complex UIs. The component lifecycle includes mounting, updating, and unmounting phases. Data flows unidirectionally down the component tree. React has a vibrant ecosystem and community for continued learning.
JSX is an XML-like syntax used with React to describe what the UI should look like. There can only be one root element, attribute names use camelCase, and expressions are used to render dynamic values. Custom components start with uppercase letters and can accept children as nested elements or via the "children" prop. Conditional rendering uses techniques like the && and ternary operators to toggle display of components.
This document introduces ReactJS, a JavaScript library for building user interfaces. It discusses key React concepts like the virtual DOM, which is a JavaScript representation of real DOM elements that allows React to efficiently update the real DOM by comparing it to a new virtual DOM. It also covers one-way data binding in React, where data flows from parent to child components through props, while events flow in the opposite direction. Finally, it emphasizes that in React, everything is a component, and components manage their own state and receive immutable props from parent components.
The document discusses React patterns and hooks. It covers topics like inheritance, composition, mixins, render props, higher order components (HOCs), and React hooks. Some key points:
- Inheritance and composition are approaches to code reuse in object-oriented programming. React uses composition over inheritance.
- Mixins were introduced in 2015 for code reuse but are now deprecated due to issues. Render props and HOCs are preferred patterns.
- Render props and HOCs allow code and state to be shared across components. Render props have fewer levels of nesting while HOCs are better for applying multiple concerns.
- Hooks were introduced to overcome class component limitations and support functional components with local state and lif
Jetpack Compose untuk UI Masa Depan Bagian 2 - Sidiq PermanaDicodingEvent
Kita telah mempelajari fundamental terkait Jetpack Compose pada pertemuan sebelumnya. Kali ini kita akan mengenal Layout dan State lebih dalam di mana kedua komponen tersebut berperan secara fundamental dan membedakan implementasi pengembangan UI dengan cara lainnya.
Dicoding Event hadir menyapa Anda dengan materi lanjutan kelas pro ini. Mari belajar implementasi Layout dan State Jetpack Compose dengan mudah dan aplikatif. Serta yang terpenting, langsung bisa Anda aplikasikan pada kodemu sendiri
Sesi IDCamp X Dicoding LIVE ke-14 kali ini, akan mengupas tuntas:
- Pengenalan dan Implementasi Prinsip Layout yang Aplikatif
- Pengenalan dan Implementasi State
The document provides an overview of iOS app development basics including building a "Hello World" app, application architecture and states, coding in Objective-C, short message sending, storyboarding, and static table views. It discusses setting up an Xcode project, the app delegate, view controllers, windows, and application states like active, background, and suspended. It also covers Objective-C basics like properties, accessors, and blocks.
Introduction to React in combination with Redux. Redux helps you to develop applications in a simple way while having features like time-travel available during development.
Jetpack Compose is Google's new declarative UI toolkit for Android that aims to simplify building user interfaces. It uses composable functions to build up UI elements in a declarative way. Composables can update reactively in response to changes in state data models. This allows building UIs as simple as printing lines of code. Compose principles include treating UI as functions, using composable building blocks, and implementing a top-down data flow from state models to views through composables. The speaker demonstrates a simple counter app built with Compose.
Jetpack Compose is the new Android UI framework that allows you to create rich user interfaces in a declarative way using Kotlin language. In this presentation, it will be demonstrated how to take the first steps with Compose, learn its main concepts and understand how to be prepared for this change of paradigm on the front-end development of native Android applications.
This document provides an introduction to React for developers. It explains that React is a JavaScript library for building user interfaces developed by Facebook. It then covers key React concepts like components, props, state, rendering, and the virtual DOM. It also discusses tools and patterns for architecting React apps like Flux, Redux, routing, internationalization, and async logic. Finally, it recommends designing state carefully, using standards like Flux Standard Action, avoiding side effects in reducers, and leveraging tools like React DevTools.
State is managed within the component in which variables declared in function body. State can be changed. State can be accessed using “useState” Hook in functional components and “this.state” in class components. Hook is a new feature in react. To use this expression it’s essential to have good understanding of class components. State hold information that used for UI by browser.
https://www.ducatindia.com/javatraining/
React is a JavaScript library for building user interfaces. It was created by Facebook and is best for building dynamic websites like chat applications. React uses a virtual DOM for efficiently updating the view after data changes. Components are the building blocks of React and can contain state and props. The document provides an example of a simple component class and demonstrates how to add state and props. It also includes links to example code and MicroPyramid's social media profiles.
When developing applications we have a hard time managing application state, and that is okay because managing application state is hard. We will try to make it easier using Redux.
Redux is predictable state management container for JavaScript applications that helps us manage our state while also making our state mutations predictable.
Through the presentation and code, I will show you how I solved my state problem with Redux in React application.
In this presentation, Prashant Sharma of Valuebound has talked about ReactJS - a JavaScript library for building user interfaces. Check out the agendas to know what is there for you.
----------------------------------------------------------
Get Socialistic
Our website: http://valuebound.com/
LinkedIn: http://bit.ly/2eKgdux
Facebook: https://www.facebook.com/valuebound/
Twitter: http://bit.ly/2gFPTi8
In this tutorial on Kotlin Jetpack, we will learn why Jetpack compose, What is Kotlin Jetpack compose, and How does compose works?. We will also learn about Composable function, Layouts, and material design. At last, we will have a look at the List and animations.
What is Kotlin Jetpack compose?
Why Jetpack compose?
How does the compose work?
Composable function
Layouts
Material design
List and animations
Explanation of the fundamentals of Redux with additional tips and good practices. Presented in the Munich React Native Meetup, so the sample code is using React Native. Additional code: https://github.com/nacmartin/ReduxIntro
A short introduction to the new set of tools offered to Android developers - Android Jetpack. Talk held at Leeds Mobile focusing on the ViewModel and the LiveData compoments availabe in Jetpack.
This document provides an overview of React and Redux. It introduces React as a component-based library for building user interfaces using JavaScript and JSX. Key aspects of React include its lifecycle methods, use of a virtual DOM for fast updates, and functional stateless components. Redux is introduced as a state management library that uses a single immutable store with actions and reducers. It follows the Flux architecture pattern without a dispatcher. Hands-on demos are provided for key React and Redux concepts. Resources for further learning are also listed.
React Hooks were introduced in React 16.8 to add state and side effects to function components by replacing class components. Common hooks include useState for managing component state, useEffect for handling side effects like data fetching, useCallback for creating memoized functions, and useRef for creating references that don't trigger re-renders when mutated. Hooks allow extracting logic into custom reusable hooks and following a few simple rules helps avoid bugs.
This document provides an overview of React including: key features like components, JSX, and unidirectional data flow; installation and technical requirements; the component lifecycle; differences from Angular; popular companies using React; and links to examples. It covers React concepts like states, props, and events. Questions from attendees are invited at the end.
The document discusses Jetpack Compose, a declarative UI toolkit for Android. It covers topics such as:
- Thinking in Compose by describing what the UI should look like, not how to build it
- Creating composable functions that can run in any order and in parallel
- Using the Compose toolkit which includes MaterialTheme, Scaffold, and Surface
- State management with MutableState and remember to control the UI
- Ensuring composables are side-effect free and may run frequently on recomposition
React is a library for building user interfaces using components. It uses a virtual DOM for rendering components, which are pieces of UI defined as classes or functions. Components receive data via props and local state, and can be nested to build complex UIs. The component lifecycle includes mounting, updating, and unmounting phases. Data flows unidirectionally down the component tree. React has a vibrant ecosystem and community for continued learning.
JSX is an XML-like syntax used with React to describe what the UI should look like. There can only be one root element, attribute names use camelCase, and expressions are used to render dynamic values. Custom components start with uppercase letters and can accept children as nested elements or via the "children" prop. Conditional rendering uses techniques like the && and ternary operators to toggle display of components.
This document introduces ReactJS, a JavaScript library for building user interfaces. It discusses key React concepts like the virtual DOM, which is a JavaScript representation of real DOM elements that allows React to efficiently update the real DOM by comparing it to a new virtual DOM. It also covers one-way data binding in React, where data flows from parent to child components through props, while events flow in the opposite direction. Finally, it emphasizes that in React, everything is a component, and components manage their own state and receive immutable props from parent components.
The document discusses React patterns and hooks. It covers topics like inheritance, composition, mixins, render props, higher order components (HOCs), and React hooks. Some key points:
- Inheritance and composition are approaches to code reuse in object-oriented programming. React uses composition over inheritance.
- Mixins were introduced in 2015 for code reuse but are now deprecated due to issues. Render props and HOCs are preferred patterns.
- Render props and HOCs allow code and state to be shared across components. Render props have fewer levels of nesting while HOCs are better for applying multiple concerns.
- Hooks were introduced to overcome class component limitations and support functional components with local state and lif
Jetpack Compose untuk UI Masa Depan Bagian 2 - Sidiq PermanaDicodingEvent
Kita telah mempelajari fundamental terkait Jetpack Compose pada pertemuan sebelumnya. Kali ini kita akan mengenal Layout dan State lebih dalam di mana kedua komponen tersebut berperan secara fundamental dan membedakan implementasi pengembangan UI dengan cara lainnya.
Dicoding Event hadir menyapa Anda dengan materi lanjutan kelas pro ini. Mari belajar implementasi Layout dan State Jetpack Compose dengan mudah dan aplikatif. Serta yang terpenting, langsung bisa Anda aplikasikan pada kodemu sendiri
Sesi IDCamp X Dicoding LIVE ke-14 kali ini, akan mengupas tuntas:
- Pengenalan dan Implementasi Prinsip Layout yang Aplikatif
- Pengenalan dan Implementasi State
The document provides an overview of iOS app development basics including building a "Hello World" app, application architecture and states, coding in Objective-C, short message sending, storyboarding, and static table views. It discusses setting up an Xcode project, the app delegate, view controllers, windows, and application states like active, background, and suspended. It also covers Objective-C basics like properties, accessors, and blocks.
The document provides an overview of Android app development concepts including activity lifecycle, app architecture, navigation, and use of ViewModels. It discusses how activities transition through various states, principles of separation of concerns and unidirectional data flow in architecture, and how to implement navigation between screens in a multi-screen app while respecting architecture. Hands-on examples are provided for activity lifecycle, handling configuration changes with ViewModels, and navigation.
Mobile Programming - 7 Side Effects, Effect Handlers, and Simple AnimationsAndiNurkholis1
Material for this slide includes:
1. Description of effect handlers and their types
2. Description of side effects and their examples
3. Description of animations and their APIs in Jetpack Compose
How to build a react native app with the help of react native hooksKaty Slemon
How to build React Native application using React Hooks. Hire React Native developer to extract component logic into reusable functions without writing a class.
This document discusses functional programming in TypeScript. It begins by defining functional programming concepts like immutability, higher order functions, and avoiding side effects. It then outlines three tenets of functional programming: taming side effects, using expressions over statements, and higher order functions. Finally, it details TypeScript features that support functional programming, including spread/rest operators, lambda expressions, union types, type inference, and tagged union types.
At Lia Infraservice we create Dynamic Websites. Become a front-end React JS developer and be a part of our tech-savvy Web App Development Company in Chennai.
"The Story of Declarative React at Grammarly: From two-way data binding with ...Fwdays
In this talk, we will detail the history of how the team behind the Grammarly Editor approached React components composition and state management, the problems faced over the years, and how these challenges shape the future of React at Grammarly — a pure, side effect-free, and declarative way to define React-based UI.
this presentation serve as an introduction to Angular JavaScript framework and also touch on some basic modern JavaScript, front-end development basics.
Introduction to State Restoration in FlutterDave Chao
State Restoration let your user keep the experience intact and land to his app at the same place even if the operating system kills the app in the background.
Angular 16 is the biggest release since the initial rollout of Angular, and it changes everything: Bye bye zones, change-detection, life-cycle, children-selectors, Rx and what not.
Recorded webinar based on these slides given by Yaron Biton, Misterbit Coding-Academy’s CTO, can be found at: https://www.youtube.com/watch?v=92K1fgPbku8
Coding-Academy offers advanced web-techs training and software development services: Top-rated Full-stack courses for Angular, React, Vue, Node, Modern architectures, etc. | Available top-notch on-demand-coders trough Misterbit technological solutions | Coding-Academy Bootcamp: Hundreds of employed full-stack developers every year | Anything web, end to end projects | Tech companies and startups | Consulting to management and dev teams | Workshops for managers and leaders.
React and its component structure
● What are Hooks?
● React Hooks and their capabilities
● Migrating Your Existing Apps to React Hooks
● Combine Existing React Hooks into New Custom Hooks
● Benefits of using React Hooks
● Best Practices
The document discusses implementing the Memento pattern in the Exparency BPM system to provide undo/redo functionality. It describes using two queues - a command queue and an undo queue - to store commands. Command objects save the old and new state and are serialized/deserialized. A CommandManager interacts with these queues and localStorage to persist commands. This allows recorded macros to reproduce issues for debugging.
This document summarizes a session on building a money counter app using Jetpack Compose. It discusses key Compose concepts like composition, recomposition, state and state hoisting. It shows how to create a counter button composable with a count variable, update the count on button click using mutable state, and recompose the UI. It then explains how to move the count state out of the button into the parent MoneyCounter composable to make the button stateless.
Automation testing material by Durgasoft,hyderabadDurga Prasad
The document discusses automation testing tools QuickTest Professional (QTP) and Unified Functional Testing (UFT). It provides an overview of QTP, describing its features such as scripting language, supported applications and browsers. The document also covers QTP concepts like object repository, object spy, standard classes and object methods.
Read about Redux, a state management for any vanilla javascript framework, it works on client, server and native.
complete introduction and also a comparison with its alternative.
last but not least we have a quick review on redux middleware
Over the last few months one of our development teams has been working on content-driven mobile apps for multiple customers. The architecture, design and technology choices have gone through various iterations and we have learned a lot along the way. In this talk we want to share some of the experiences we have made, talk about architecture and design decisions. We will discuss some core design concepts that have proven their value, for content-driven mobile apps as well as other types of applications.
React Basics
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Modern app development with Jetpack Compose.pptx
1. Modern app development with
Jetpack Compose
Md Shamsul Arafin Mahtab
Software Engineer (Android), Therap Services
2. Why Adopt Compose
● Less Code
● Declarative API
● Faster Development
● Powerful
“For the same Button class it [the code] was 10x
of magnitude smaller.” (Twitter)
“Significant reduction for any screen built with a
RecyclerView.” (Monzo)
“Reading the code for complicated components
is easier.” (Square)
3. Why Adopt Compose
● Less Code
● Declarative API
● Faster Development
● Powerful
“Theming layer is vastly more intuitive and
legible.” (Twitter)
“UI components that were stateless, easy to use
and maintain, and intuitive to
implement/extend/customize.” (Twitter)
4. Why Adopt Compose
● Less Code
● Declarative API
● Faster Development
● Powerful
“We didn’t have to think about things like light
and dark mode.” (Cuvva)
“Previews in Android Studio have been a big
time saver.” (Square)
5. Why Adopt Compose
● Less Code
● Declarative API
● Faster Development
● Powerful
“Animations are so easy to add.” (Monzo)
“Accessibility apis have been improved.”
(Square)
12. ● All Composable functions must have
@Composable annotation; this
annotation informs the Compose
compiler that this function is intended to
convert data into UI.
● The function doesn't return anything.
● This function is fast, idempotent, and
free of side-effects.
A compose function
13. The declarative widgets
1. Widgets are relatively stateless
2. They do not expose any setter or getter functions
3. Widget are not exposed as objects
4. Composables are responsible for transforming the current application state into a UI
every time the observable data updates
14. A compose app example
Scaffold
Currencies
Timeline
Column
CurrencyPicker
Spacer
Spacer
Spacer
Box
CurrencyPicker
Icon
TextField
Dropdown
TopAppBar
BottomBar
Navigation Converter
TextField
Dropdown
Base
Current
1
USD
17. Things to be aware of
1. Composable functions can execute in any order
2. Composable functions can run in parallel
3. Recomposition skips as much as possible
4. Recomposition is optimistic
5. Composable functions might run quite frequently
20. Use of remember and rememberSaveable
1. remember composables stores single objects in memory by composable functions,
retain state across recomposition.
2. rememberSaveable same as remember, except retain states across configuration
changes.
21. Other supported types of State
1. LiveData
2. Flow
3. RxJava2
These observable types are converted to State<T> before reading it to Compose.
22. is a pattern of moving state to a composable's
caller to make a composable stateless.
State Hoisting
➔ value: T: the current value to display
➔ onValueChange: (T) -> Unit: an event
that requests the value to change, where
T is the proposed new value
25. State Management
Depending on the complexity of the composable, these are the alternatives to consider:
● Composables for simple UI element state management.
● State holders for complex UI element state management. They own UI elements' state and UI
logic.
● Architecture Components ViewModels as a special type of state holder in charge of providing
access to the business logic and the screen or UI state.
26. Use of Key
Recomposition (new
item added to top)
Calling a composable multiple times with key will help
to identify each composition distinct.
27. Use of Stable
Annotating the type with @Stable to allow Compose to favor smart recompositions if Compose
is not able to infer the stability of a type.
28. Modifiers
to decorate or augment a composable.
● Change the composable's size, layout, behavior, and appearance
● Add information, like accessibility labels
● Process user input
● Add high-level interactions, like making an element clickable, scrollable, draggable, or zoomable
31. Effects and Side-effects in Compose
1. A side-effect is a change to the state
of the app that happens outside the
scope of a composable function.
2. An effect is a composable function
that doesn't emit UI and causes side
effects to run when a composition
completes.
Effect {
Side Effect
}
Called from a controlled environment
that is aware of the lifecycle of the
composable.
32. LaunchedEffect
To call suspend functions safely from inside a composable,
LaunchedEffect composable to use.
Example: Showing error message on a Snackbar if a UI state
contains an error.
rememberCoroutineScope
To launch a coroutine outside of a composable, but
scoped so that it will be automatically canceled
once it leaves the composition.
Example: Showing a Snackbar when the user taps.
DisposableEffect
Effects that need to cleaned up after keys change or
the composables leaves the composition.
@Composable
fun HomeScreen(key: Key) {
DisposableEffect(key) {
val observer = Observer { }
addObserver(observer)
onDispose {
removeObserver(observer)
}
}
}
rememberUpdatedState
Capture a value in the effect
that, while recomposition,
the effect will not restart.
Example: Splash Screen.
SideEffect
To share Compose state
with objects not managed
by compose, SideEffect
composable to use.
produceState
Convert non-Compose state
into Compose state.
Example: Loading network
image and convert it to
State object.
@Composable
fun loadNetworkImage(
url: String,
imageRepository: ImageRepository
): State<Result<Image>> {
return
produceState<Result<Image>> {
//TODO }
}
34. Phases of Android View System
Composition Layout Drawing
Measurement Placement
35. Compose Architecture Layering
Runtime UI Foundation Material
Compose is created from a number of modules which are assembled together to form a complete
stack
Each layer is built upon the lower levels, combining functionality to create higher level components.
36. Use of CompositionLocal
● CompositionLocal is a tool for passing
data down through the Composition
implicitly.
● It is what the Material theme uses under
the hood.
● MaterialTheme is an object that provides
three CompositionLocal instances--
colors, typography and shapes
Manipulating views manually increases the chance of errors
Picker event notifies the app logic. Then the logic provides data to the top-level composable functions. That functions uses the data to describe the UI by calling other composables.
In an imperative UI model, to change a widget, you call a setter on the widget to change its internal state. In Compose, you call the composable function again with new data. Doing so causes the function to be recomposed--the widgets emitted by the function are redrawn, if necessary, with new data. The Compose framework can intelligently recompose only the components that changed.
derivedStateOf: convert one or multiple state objects into another state
snapshotFlow: convert Compose's State into Flows