Application Development

• Application Development Overview
• Quick Start
  • Getting Started
    • Before You Start
    • Building the First ArkTS Application in Stage Model
  • Development Fundamentals
    • Application Package Fundamentals
      • Application Package Overview
      • Application Package Structure
        • Application Package Structure in Stage Model
        • Application Package Structure in FA Model
      • Multi-HAP Mechanism
        • Multi-HAP Design Objectives
        • Multi-HAP Build View
        • Multi-HAP Development, Debugging, Release, and Deployment
        • Multi-HAP Usage Rules
        • Multi-HAP Operation Mechanism and Data Communication Modes
      • Application Installation and Uninstallation
      • Application Package Update
      • Shared Package
        • Shared Package Overview
        • HAR
        • HSP
      • Quick Fix
        • Quick Fix Overview
        • CLI-based Quick Fix Development
    • Application Configuration Files in Stage Model
      • Application Configuration Files (Stage Model)
      • app.json5 Configuration File
      • module.json5 Configuration File
    • Application Configuration Files in FA Model
      • Application Configuration Files (FA Model)
      • Internal Structure of the app Tag
      • Internal Structure of the deviceConfig Tag
      • Internal Structure of the module Tag
  • Resource Categories and Access
  • Learning ArkTS
    • Getting Started with ArkTS
    • Introduction to ArkTS
    • TypeScript to ArkTS Migration Guide
      • ArkTS Migration Background
      • TypeScript to ArkTS Cookbook
      • Adaptation Cases
    • UI Paradigm
      • Basic Syntax
        • Basic Syntax Overview
        • Declarative UI Description
        • Custom Components
          • Creating a Custom Component
          • Page and Custom Component Lifecycle
        • @Builder Decorator: Custom Builder Function
        • @BuilderParam Decorator: @Builder Function Reference
        • @Styles Decorator: Definition of Resusable Styles
        • @Extend Decorator: Extension of Built-in Components
        • stateStyles: Polymorphic Style
        • @AnimatableExtend Decorator: Definition of Animatable Attributes
      • State Management
        • State Management Overview
        • Component State Management
          • @State Decorator: State Owned by Component
          • @Prop Decorator: One-Way Synchronization from Parent to Child Components
          • @Link Decorator: Two-Way Synchronization Between Parent and Child Components
          • @Provide and @Consume Decorators: Two-Way Synchronization with Descendant Components
          • @Observed and @ObjectLink Decorators: Observing Attribute Changes in Nested Class Objects
        • Application State Management
          • Application State Management Overview
          • LocalStorage: UI State Storage
          • AppStorage: Application-wide UI State Storage
          • PersistentStorage: Application State Persistence
          • Environment: Device Environment Query
        • Other State Management Features
          • Overview of Other State Management Features
          • @Watch Decorator: Getting Notified of State Variable Changes
          • $$ Syntax: Two-Way Synchronization of Built-in Components
        • MVVM
        • Best Practices for State Management
      • Rendering Control
        • if/else: Conditional Rendering
        • ForEach: Rendering of Repeated Content
        • LazyForEach: Lazy Data Loading
• Development
  • Application Models
    • Application Model Overview
      • Elements of the Application Model
      • Interpretation of the Application Model
    • Stage Model Development
      • Stage Model Development Overview
      • Stage Model Application Components
        • Application- or Component-Level Configuration
        • UIAbility Component
          • UIAbility Overview
          • UIAbility Lifecycle
          • UIAbility Launch Type
          • UIAbility Usage
          • Data Synchronization Between UIAbility and UI Page
          • Intra-Device Interaction Between UIAbility Components
        • ExtensionAbility Component
          • ExtensionAbility Overview
          • ServiceExtensionAbility
          • AccessibilityExtensionAbility
          • EnterpriseAdminExtensionAbility
          • InputMethodExtensionAbility
          • WindowExtensionAbility (for System Applications Only)
          • DriverExtensionAbility
        • Service Widget Development in Stage Model
          • Service Widget Overview
          • Developing an ArkTS Widget
            • ArkTS Widget Working Principles
            • ArkTS Widget Related Modules
            • ArkTS Widget Development
              • Creating an ArkTS Widget
              • Configuring Widget Configuration Files
              • Widget Lifecycle Management
              • Widget Page Development
                • Widget Page Capability Overview
                • Using Animations in the Widget
                • Applying Custom Drawing in the Widget
              • Widget Event Development
                • Widget Event Capability Overview
                • Redirecting to a UIAbility Through the router Event
                • Launching a UIAbility in the Background Through the call Event
                • Updating Widget Content Through the message Event
                • Updating Widget Content Through the router or call Event
              • Widget Data Interaction
                • Widget Data Interaction Overview
                • Configuring a Widget to Update Periodically
                • Updating Widget Content Through a Proxy
                • Updating Local and Online Images in the Widget
                • Updating Widget Content by State
                • Updating Widget Content by Widget Host (for System Applications Only)
          • Developing a JS Widget
        • AbilityStage Component Container
        • Context
        • Want
          • Want Overview
          • Matching Rules of Explicit Want and Implicit Want
          • Common action and entities Values
          • Using Explicit Want to Start an Application Component
          • Using Implicit Want to Open a Website
          • Using Want to Share Data Between Applications
        • Component Startup Rules (Stage Model)
        • Inter-Device Application Component Interaction (Continuation)
          • Continuation Overview
          • Cross-Device Migration
          • Multi-device Collaboration
        • Subscribing to System Environment Variable Changes
      • Process Model
        • Process Model Overview
        • Common Events
          • Introduction to Common Events
          • Common Event Subscription
            • Common Event Subscription Overview
            • Subscribing to Common Events in Dynamic Mode
            • Subscribing to Common Events in Static Mode (for System Applications Only)
            • Unsubscribing from Common Events in Dynamic Mode
          • Publishing Common Events
          • Removing Sticky Common Events (for System Applications Only)
        • Background Services
      • Thread Model
        • Thread Model Overview
        • Using EventHub for Intra-Thread Communication
      • Mission Management
        • Mission Management Scenarios
        • Mission and Launch Type
        • Page Stack and Mission List
        • Setting the Icon and Name of a Mission Snapshot
      • Application Configuration File (Stage Model)
    • FA Model Development
      • FA Model Development Overview
      • FA Model Application Components
        • Application- or Component-Level Configuration
        • PageAbility Component Development
          • PageAbility Overview
          • PageAbility Configuration
          • PageAbility Lifecycle
          • PageAbility Launch Type
          • Creating a PageAbility
          • Starting a Local PageAbility
          • Stopping a PageAbility
          • Starting a Remote PageAbility (for System Applications Only)
          • Starting a Specified Page
          • Window Properties
          • Requesting Permissions
          • Redirection Rules
        • ServiceAbility Component Development
          • ServiceAbility Overview
          • ServiceAbility Configuration
          • ServiceAbility Lifecycle
          • Creating a ServiceAbility
          • Starting a ServiceAbility
          • Connecting to a ServiceAbility
        • DataAbility Component Development
          • DataAbility Overview
          • DataAbility Configuration
          • DataAbility Lifecycle
          • Creating a DataAbility
          • Starting a DataAbility
          • Accessing a DataAbility
          • DataAbility Permission Control
        • Service Widget Development in FA Model
        • Context
        • Want
        • Component Startup Rules (FA Model)
      • Process Model
        • Process Model Overview
        • Common Events
        • Background Services
      • Thread Model
        • Thread Model Overview
        • Using Emitter for Inter-Thread Communication
      • Mission Management
      • Application Configuration File (FA Model)
    • Development of Component Interaction Between the FA Model and Stage Model
      • Component Interaction Between the FA Model and Stage Model
      • Starting a UIAbility from the FA Model
      • Connecting to a ServiceExtensionAbility from the FA Model
      • Accessing a DataShareExtensionAbility from the FA Model
      • Starting a PageAbility from the Stage Model
      • Connecting to a ServiceAbility from the Stage Model
    • Switching from the FA Model to the Stage Model
      • Model Switching Overview
      • Configuration File Switching
        • Differences in Configuration Files
        • Switching of app and deviceConfig
        • Switching of module
      • Component Switching
        • PageAbility Switching
        • ServiceAbility Switching
        • DataAbility Switching
      • Widget Switching
      • API Switching
        • API Switching Overview
        • Context Switching
        • featureAbility Switching
        • particleAbility Switching
        • LifecycleForm Switching
        • LifecycleApp Switching
        • LifecycleService Switching
        • LifecycleData Switching
        • DataAbilityHelper Switching
        • mediaLibrary Switching
        • request Switching
        • resourceManager Switching
        • window Switching
        • Storage Switching
  • UI Development
    • ArkUI Overview
    • UI Development (ArkTS-based Declarative Development Paradigm)
      • UI Development (ArkTS-based Declarative Development Paradigm) Overview
      • Layout Development
        • Layout Overview
        • Building a Layout
          • Linear Layout (Row/Column)
          • Stack Layout (Stack)
          • Flex Layout (Flex)
          • Relative Layout (RelativeContainer)
          • Responsive Grid Layout (GridRow/GridCol)
          • MediaQuery (mediaquery)
          • Creating a List (List)
          • Creating a Grid (Grid/GridItem)
          • Creating a Swiper (Swiper)
      • Adding a Component
        • Adding a Common Component
          • Button
          • Radio Button (Radio)
          • Toggle
          • Progress Indicator (Progress)
          • Text Display (Text/Span)
          • Text Input (TextInput/TextArea)
          • Custom Dialog Box (CustomDialog)
          • Video Playback (Video)
          • XComponent
        • Adding a Popup and Menu
          • Popup
          • Menu
      • Setting Page Routing and Component Navigation
        • Page Routing (router)
        • Component Navigation
          • Navigation
          • Tabs
      • Using Graphics
        • Displaying Images (Image)
        • Drawing Geometric Shapes (Shape)
        • Drawing Custom Graphics on the Canvas (Canvas)
      • Using Animation
        • Animation Overview
        • Property Animation
          • Property Animation Overview
          • Property Animation APIs
          • Custom Property Animation
        • Transition Animation
          • Transition Animation Overview
          • Enter/Exit Transition
          • Navigation Transition
          • Modal Transition
          • Shared Element Transition
          • Page Transition Animation (Not Recommended)
        • Component Animation
        • Animation Curve
          • Animation Curve Overview
          • Traditional Curve
          • Spring Curve
        • Animation Smoothing
        • Animation Effects
          • Blur Effect
          • Shadow Effect
          • Color Effect
      • Using Interaction Events
        • Interaction Event Overview
        • Universal Events
          • Touchscreen Event
          • Keyboard and Mouse Event
          • Focus Event
        • Gesture Events
          • Gesture Binding
          • Single Gesture
          • Combined Gestures
    • UI Development with JavaScript-compatible Web-like Development Paradigm
      • UI Development with JavaScript-compatible Web-like Development Paradigm Overview
      • Framework
        • File Organization
        • "js" Tag
        • app.js
        • Syntax
          • HML
          • CSS
          • JavaScript
        • Lifecycle
        • Resource Limitations and Access
        • Multi-Language Capability
      • Building the UI
        • Component Overview
        • Building the Layout
          • Layout Description
          • Adding Title and Paragraph Text
          • Adding an Image
          • Adding a Comment
          • Adding a Container
        • Adding Interactions
        • Developing Animations
        • Defining Gesture Events
        • Defining Page Routes
      • Common Component Development Guidelines
        • Container Components
          • List Development
          • Dialog Development
          • Form Development
          • Stepper Development
          • Tabs Development
          • Swiper Development
        • Basic Components
          • Text Development
          • Input Development
          • Button Development
          • Picker Development
          • Image Development
          • Image-animator Development
          • Rating Development
          • Slider Development
          • Chart Development
          • Switch Development
          • Toolbar Development
          • Menu Development
          • Marquee Development
          • Qrcode Development
          • Search Development
        • Canvas Development
          • Canvas
          • CanvasRenderingContext2D
          • Path2D
          • OffscreenCanvasRenderingContext2D
        • Grid-container Development
        • Svg
          • Basics
          • Graph Drawing
          • Path Drawing
          • Text Drawing
      • Animation Development Guidelines
        • CSS Animation
          • Defining Attribute Style Animations
          • Defining Animations with the transform Attribute
          • Defining Animations with the background-position Attribute
          • Defining Animations for SVG Components
        • JS Animation
          • Component Animation
          • Interpolator Animation
            • Animation Effect
            • Animation Frame
      • Custom Components
  • ArkTS Common Library
    • Overview of ArkTS Common Library
    • Concurrency
      • Concurrency Overview
      • Using Asynchronous Concurrency for Development
        • Asynchronous Concurrency Overview (Promise and Async/Await)
        • Single I/O Task Development (Promise and Async/Await)
      • Using Multithread Concurrency for Development
        • Multithread Concurrency Overview (TaskPool and Worker)
        • TaskPool Introduction
        • Worker Introduction
        • Comparison Between TaskPool and Worker
        • CPU Intensive Task Development (TaskPool and Worker)
        • I/O Intensive Task Development (TaskPool)
        • Synchronous Task Development (TaskPool and Worker)
      • Appendix
        • Comparison Between the Actor and Memory Sharing Models
        • Serialization Types Supported by TaskPool and Worker
        • @Concurrent Decorator: Verifying Concurrent Functions
    • Container
      • Container Overview
      • Linear Containers
      • Nonlinear Containers
    • XML Generation, Parsing, and Conversion
      • XML Overview
      • XML Generation
      • XML Parsing
      • XML Conversion
  • Web
    • Web Component Overview
    • Loading Pages by Using the Web Component
    • Setting Basic Attributes and Events
      • Setting the Dark Mode
      • Uploading Files
      • Opening Pages in a New Window
      • Managing Location Permissions
    • Using Frontend Page JavaScript Code on the Application
      • Invoking Frontend Page Functions on the Application
      • Invoking Application Functions on the Frontend Page
      • Establishing a Data Channel Between the Application and the Frontend Page
    • Managing Page Redirection and Browsing History Navigation
    • Managing Cookies and Data Storage
    • Customizing Page Request Responses
    • Debugging Frontend Pages by Using DevTools
  • Notification
    • Notification Overview
    • Notification Subscription (for System Applications Only)
    • Enabling Notification
    • Notification Badge
    • Publishing a Notification
      • Publishing a Basic Notification
      • Publishing a Progress Notification
      • Adding a WantAgent Object to a Notification
  • Window Manager
    • Window Overview
    • Application Window Development (Stage Model)
    • Application Window Development (FA Model)
    • System Window Development (Stage Model Only)
  • WebGL
    • WebGL Overview
    • WebGL Development
  • Media
    • Media Application Development Overview
    • Audio and Video
      • Audio and Video Overview
      • AVPlayer and AVRecorder
      • Audio Playback
        • Audio Playback Overview
        • Using AVPlayer for Audio Playback
        • Using AudioRenderer for Audio Playback
        • Using OpenSL ES for Audio Playback
        • Using TonePlayer for Audio Playback (for System Applications Only)
        • Using OHAudio for Audio Playback
        • Using SoundPool for Audio Playback
        • Audio Playback Concurrency Policy
        • Volume Management
        • Audio Effect Management
        • Audio Playback Stream Management
        • Audio Output Device Management
        • Distributed Audio Playback (for System Applications Only)
      • Audio Recording
        • Audio Recording Overview
        • Using AVRecorder for Audio Recording
        • Using AudioCapturer for Audio Recording
        • Using OpenSL ES for Audio Recording
        • Using OHAudio for Audio Recording
        • Microphone Management
        • Audio Recording Stream Management
        • Audio Input Device Management
      • Audio Call
        • Audio Call Overview
        • Developing Audio Call
      • Video Playback
      • Video Recording
      • Screen Capture
      • Audio and Video Codecs
        • Obtaining Supported Codecs
        • Audio Encoding
        • Audio Decoding
        • Video Encoding
        • Video Decoding
        • Audio/Video Encapsulation
        • Audio/Video Decapsulation
    • AVSession
      • AVSession Overview
      • Local AVSession
        • Local AVSession Overview
        • AVSession Provider
        • AVSession Controller
      • Distributed AVSession
        • Distributed AVSession Overview
        • Using Distributed AVSession
    • Camera
      • Camera Overview
      • Camera Development
        • Camera Development Preparations
        • Device Input Management
        • Session Management
        • Camera Preview
        • Camera Photographing
        • Camera Recording
        • Camera Metadata
      • Best Practices
        • Camera Photographing Sample
        • Camera Recording Sample
        • Taking Photos in Portrait Mode
        • Dual-Channel Preview
        • Using Performance Improvement Features (for System Applications Only)
    • Image
      • Image Overview
      • Image Decoding
      • Image Processing
        • Image Transformation (ArkTS)
        • Image Transformation (Native)
        • PixelMap Data Processing (Native)
        • Pixel Map Operation
      • Image Encoding
      • Image Tool
  • Security
    • Access Control
      • Access Control (Permission) Overview
      • Applying for Permissions
      • Verifying API Access Permissions
      • Application Permission List
      • Application Permission Group List
    • Security Component
      • Security Component Overview
      • Security Component Development
    • Data Loss Prevention (DLP)
      • DLP Overview
      • DLP Development
    • User Authentication
      • User Authentication Overview
      • User Authentication Development
    • HUKS
      • HUKS Overview
      • HUKS Development (ArkTS)
      • HUKS Development (Native)
      • HUKS Cipher Algorithm Specifications
    • Crypto Framework
      • Crypto Framework Overview
      • Crypto Framework Development
    • Certificate
      • Certificate Overview
      • Certificate Development
    • hapsigner
      • hapsigner Overview
      • hapsigner Guide
      • HarmonyAppProvision Configuration File
  • AI
    • AI Development
    • Using MindSpore Lite JavaScript APIs to Develop AI Applications
    • Using MindSpore Lite Native APIs to Develop AI Applications
  • Connectivity
    • Network Management
      • Network Management Overview
      • HTTP Data Request
      • WebSocket Connection
      • Socket Connection
      • Network Sharing
      • Ethernet Connection
      • Network Connection Management
      • MDNS Management
      • Traffic Management
      • VPN Management
    • IPC & RPC
      • IPC & RPC Overview
      • IPC & RPC Development
      • Subscribing to State Changes of a Remote Object
  • Telephony Service
    • Telephony Service Overview
    • Call Service Development
    • SMS Service Development
  • Data Management
    • Data Management Overview
    • Application Data Persistence
      • Overview of Application Data Persistence
      • Persisting Preferences Data
      • Persisting KV Store Data
      • Persisting RDB Store Data
    • Distributed Application Data Synchronization
      • Distributed Application Data Synchronization Overview
      • Cross-Device Synchronization of KV Stores
      • Cross-Device Synchronization of RDB Stores
      • Cross-Device Synchronization of Distributed Data Objects
    • Data Reliability and Security
      • Data Reliability and Security Overview
      • Database Backup and Restoration
      • Database Encryption
      • Access Control by Device and Data Level
    • Cross-Application Data Sharing
      • Data Sharing Overview
      • Unified Data Definition
      • One-to-Many Data Sharing (for System Applications Only)
        • Sharing Data Using DataShareExtensionAbility
        • Silent Access via the DatamgrService
      • Many-to-Many Data Sharing
        • Sharing Data via Unified Data Channels
  • File Management
    • File Management Overview
    • Application Files
      • Application File Overview
      • Application Sandbox
      • Application File Access and Management
        • Accessing Application Files
        • Uploading and Downloading Application Files
        • Obtaining Application and File System Space Statistics
      • Pushing Files to an Application Sandbox Directory
      • Sharing an Application File
      • Application Data Backup and Restore
        • Application Data Backup and Restore Overview
        • Accessing Backup and Restore
        • Triggering Backup and Restore (for System Applications Only)
    • User Files
      • User File Overview
      • User File URI
      • Selecting and Saving User Files (FilePicker)
        • Selecting User Files
        • Saving User Files
      • Album Management (photoAccessHelper)
        • photoAccessHelper Overview
        • Managing Media Assets
        • Managing User Albums
        • Managing System Albums
        • Observing Media Assets
      • Developing a File Manager Application (for System Applications Only)
      • Managing External Storage Devices (for System Applications Only)
    • Distributed File System
      • Distributed File System Overview
      • Setting the Security Level of a Distributed File
      • Accessing Files Across Devices
  • Background Task Management
    • Background Task Overview
    • Transient Task
    • Continuous Task
    • Deferred Task
    • Agent-powered Reminder
    • Requesting Efficiency Resources (for Privileged System Applications Only)
  • Device Management
    • USB Service
      • USB Service Overview
      • USB Service Development
    • Location
      • Location Development
    • Sensor
      • Sensor Overview
      • Sensor Development
    • Vibrator
      • Vibrator Overview
      • Vibrator Development
    • Multimodal Input
      • Input Device Development
      • Mouse Pointer Development
    • Update Service
      • Sample Server Overview
      • Sample Server Development
    • Stationary
      • Stationary Development
    • Peripheral
      • Peripheral Management Development
  • Device Usage Statistics
    • Device Usage Statistics Overview
    • Device Usage Statistics Development
  • DFX
    • Development of Application Event Logging
    • Development of Distributed Call Chain Tracing
    • HiLog Development (Native)
    • Performance Tracing
      • Development of Performance Tracing (ArkTS)
      • Development of Performance Tracing (Native)
    • Error Management
      • Development of Error Manager
      • Development of Application Recovery
    • Log Analysis
      • Application Freeze (appfreeze) Log Analysis
      • cppcrash Log Analysis
  • Internationalization and Localization
    • Overview of Internationalization and Localization
    • Application Internalization
      • UI Design for Internationalization
      • Locale and Cultural Habit Division
      • Language and User Preference Setting
        • System Language and Region Setting
        • User Preference Setting
      • Date and Time Formatting
      • Number and Unit of Measurement Formatting
      • Phone Number Formatting
      • Calendar Setting
      • Time Zone and DST Setting
        • Timezone Setting
        • DST Transition
      • Multilingual Sorting
        • Overview of Multilingual Sorting
        • Sorting by Local Habits
        • Sorting by Indexes
      • Character Processing
      • Name Localization
        • Language and Locale Name Localization
        • Time Zone Name Localization
    • Application Localization
      • Multilingual Resource Provisioning
      • Application Translation
        • Hard Coding and Concatenation Prevention
        • Scene and Context Clarification for Translation
        • Singular/Plural Form Selection
    • Localization Testing
      • Pseudo-Localization Testing
        • Overview of Pseudo-Localization Testing
        • Pseudo-Localization Testing for Translation
        • Pseudo-Localization Testing for UI Mirroring
      • Linguistic Testing
  • Application services
    • OAID Service
  • Application Test
    • arkXtest User Guide
    • SmartPerf User Guide
    • wukong User Guide
  • IDL Specifications and User Guide
  • Native APIs
    • Getting Started with the NDK
    • Creating an NDK Project
    • Building an NDK Project
      • NDK Project Building Overview
      • Building an NDK Project with the DevEco Studio Template
      • Building an NDK Project with the Command Line CMake
      • Building an NDK Project with Prebuilt Libraries
    • Code Development
      • Development Overview
      • Node-API Development
        • OpenHarmony Node-API Overview
        • Node-API Development Specifications
        • Node-API Development Process
        • Typical Scenarios
          • Asynchronous Task Development Using Node-API
          • Thread Safety Development Using Node-API
        • OpenHarmony Node-API FAQs
      • Graphics
        • XComponent Development
        • Using Drawing to Draw and Display Graphics
        • Native Buffer Development
        • Native Image Development
        • Native Vsync Development
        • Native Window Development
        • Vulkan Development
      • Resource Management
        • Raw File Development
      • Resource Scheduling
        • FFRT Development
      • AI
        • Using MindSpore Lite for Model Inference
        • Using MindSpore Lite for Offline Model Conversion and Inference
        • Connecting the Neural Network Runtime to an AI Inference Framework
      • Memory Management
        • Purgeable Memory Development
      • Device Management
        • USB DDK Development
      • Data Management
        • Relational Store Development
      • Bundle Management
        • Native Bundle Development
    • Debugging and Profiling
      • Overview of Debugging and Profiling
      • Debugging in DevEco Studio
      • LLDB Debugger
      • C/C++ Memory Error Detection
    • Hardware Compatibility
      • Introduction to Hardware Compatibility
      • OpenHarmony ABI
      • CPU Features
      • Using Neon Instructions
  • Performance
    • Application Performance Improvement Overview
    • ArkTS High-Performance Programming
      • TypeScript and JavaScript High-Performance Programming Practices and Tools
      • Efficient Concurrent Programming
      • Secure and Efficient N-API Development
    • Reducing Frame Freezing
      • Proper LazyForEach Usage for Optimization
      • Best Practices for Component Reuse
      • High-Performance WaterFlow Development
      • Swiper High-Performance Development
      • Proper State Management
      • Precisely Controlling Render Scope
      • Reducing Frame Loss
      • Reasonably Using Multithreaded Shared Memory
    • Improving Application Startup and Response Times

      • Speeding Up Application Cold Start

      • Speeding Up Application Response

      • Flex Layout Performance Improvement

      • Reducing Nesting

      • Proper IPC Usage

      • Improving File Upload and Download Performance

      • More Performance Improvement Methods

      • Reasonably Running Background Tasks

    • Profiling Tools

      • CPU Profiler

      • Typical Traces

• Tools
  • DevEco Studio (OpenHarmony) User Guide
  • Debugging Tools
    • Ability Assistant
    • Bundle Manager
    • Packing and Unpacking Tools
      • Packing Tool
      • Unpacking Tool
    • Common Event Manager
    • Advanced Notification Manager
    • restool
    • LLDB
• Hands-On Tutorials
  • Samples
  • Codelabs
• API References
  • SystemCapability
  • SystemCapability List
  • ArkTS API Reference
    • API Reference Document Description
    • Ability Framework
      • Stage Model (Recommended)
        • @ohos.app.ability.Ability (Ability Base Class)
        • @ohos.app.ability.AbilityConstant (AbilityConstant)
        • @ohos.app.ability.abilityLifecycleCallback (AbilityLifecycleCallback)
        • @ohos.app.ability.AbilityStage (AbilityStage)
        • @ohos.app.ability.ActionExtensionAbility (ExtensionAbility for Custom Actions)
        • @ohos.app.ability.ApplicationStateChangeCallback (ApplicationStateChangeCallback)
        • @ohos.app.ability.common (Context)
        • @ohos.app.ability.contextConstant (ContextConstant)
        • @ohos.app.ability.EnvironmentCallback (EnvironmentCallback)
        • @ohos.app.ability.ExtensionAbility (ExtensionAbility Base Class)
        • @ohos.app.ability.PrintExtensionAbility (Print Extension Ability)
        • @ohos.app.ability.ServiceExtensionAbility (ServiceExtensionAbility)
        • @ohos.app.ability.ShareExtensionAbility (ExtensionAbility for Sharing)
        • @ohos.app.ability.StartOptions (StartOptions)
        • @ohos.app.ability.UIAbility (UIAbility)
        • @ohos.app.ability.UIExtensionAbility (Base Class for ExtensionAbilities with UI)
        • @ohos.app.ability.UIExtensionContentSession (UI Operation Class for ExtensionAbilities with UI)
        • @ohos.app.form.FormExtensionAbility (FormExtensionAbility)
        • @ohos.application.DataShareExtensionAbility (DataShareExtensionAbility)
        • @ohos.application.StaticSubscriberExtensionAbility (StaticSubscriberExtensionAbility)
      • FA Model
        • @ohos.ability.ability (Ability)
        • @ohos.ability.featureAbility (FeatureAbility)
        • @ohos.ability.particleAbility (ParticleAbility)
      • Both Models (Recommended)
        • @ohos.app.ability.abilityDelegatorRegistry (AbilityDelegatorRegistry)
        • @ohos.app.ability.abilityManager (AbilityManager)
        • @ohos.app.ability.appManager (appManager)
        • @ohos.app.ability.appRecovery (appRecovery)
        • @ohos.app.ability.Configuration (Configuration)
        • @ohos.app.ability.ConfigurationConstant (ConfigurationConstant)
        • @ohos.app.ability.dataUriUtils (DataUriUtils)
        • @ohos.app.ability.dialogRequest (dialogRequest)
        • @ohos.app.ability.errorManager (ErrorManager)
        • @ohos.app.ability.missionManager (missionManager)
        • @ohos.app.ability.quickFixManager (quickFixManager)
        • @ohos.app.ability.Want (Want)
        • @ohos.app.ability.wantAgent (WantAgent)
        • @ohos.app.ability.wantConstant (wantConstant)
        • @ohos.app.businessAbilityRouter (Business Ability Router)
        • @ohos.app.form.formBindingData (formBindingData)
        • @ohos.app.form.formHost (FormHost)
        • @ohos.app.form.formInfo (FormInfo)
        • @ohos.app.form.formObserver (formObserver)
        • @ohos.app.form.formProvider (FormProvider)
        • @ohos.application.uriPermissionManager (URI Permission Management)
      • Both Models (To Be Deprecated Soon)
        • @ohos.ability.dataUriUtils (DataUriUtils)
        • @ohos.ability.errorCode (ErrorCode)
        • @ohos.ability.wantConstant (wantConstant)
        • @ohos.application.abilityDelegatorRegistry (AbilityDelegatorRegistry)
        • @ohos.application.abilityManager (AbilityManager)
        • @ohos.application.appManager (appManager)
        • @ohos.application.Configuration (Configuration)
        • @ohos.application.ConfigurationConstant (ConfigurationConstant)
        • @ohos.application.formBindingData (formBindingData)
        • @ohos.application.formError (FormError)
        • @ohos.application.formHost (FormHost)
        • @ohos.application.formInfo (FormInfo)
        • @ohos.application.formProvider (FormProvider)
        • @ohos.application.missionManager (missionManager)
        • @ohos.application.Want (Want)
        • @ohos.wantAgent (WantAgent)
      • Dependent Elements and Definitions
        • ability
          • abilityResult
          • connectOptions
          • dataAbilityHelper
          • dataAbilityOperation
          • dataAbilityResult
          • startAbilityParameter
          • want
        • app
          • appVersionInfo
          • context
          • processInfo
        • application
          • abilityDelegator
          • abilityDelegatorArgs
          • abilityMonitor
          • AbilityRunningInfo
          • AbilityStageContext
          • AbilityStateData
          • abilityStageMonitor
          • ApplicationContext
          • ApplicationStateObserver
          • AppStateData
          • BaseContext
          • Context
          • ContinuableInfo
          • ContinueCallback
          • ContinueDeviceInfo
          • ContinueMissionInfo
          • ErrorObserver
          • ExtensionContext
          • ExtensionRunningInfo
          • FormExtensionContext
          • MissionCallbacks
          • MissionDeviceInfo
          • MissionInfo
          • MissionListener
          • MissionParameter
          • MissionSnapshot
          • ProcessData
          • ProcessRunningInfo
          • ProcessInformation
          • ServiceExtensionContext
          • UIAbilityContext
          • UIExtensionContext
          • shellCmdResult
          • WindowExtensionContext
        • wantAgent
          • triggerInfo
          • wantAgentInfo
      • Continuation
        • @ohos.continuation.continuationManager (continuationManager)
        • continuation
          • continuationExtraParams
          • continuationResult
    • Common Event and Notification
      • System Common Events
      • @ohos.commonEventManager (Common Event) (Recommended)
      • @ohos.events.emitter (Emitter)
      • @ohos.notificationManager (NotificationManager) (Recommended)
      • @ohos.notificationSubscribe (NotificationSubscribe) (Recommended)
      • @ohos.application.StaticSubscriberExtensionContext (NotificationSubscribe) (Recommended)
      • System Common Events (To Be Deprecated Soon)
      • @ohos.commonEvent (Common Event) (To Be Deprecated Soon)
      • @ohos.notification (Notification) (To Be Deprecated Soon)
      • application
        • EventHub
      • commonEvent
        • CommonEventData
        • CommonEventPublishData
        • CommonEventSubscriber
        • CommonEventSubscribeInfo
      • notification
        • NotificationActionButton
        • NotificationCommonDef
        • NotificationContent
        • NotificationFlags
        • NotificationRequest
        • NotificationSlot
        • NotificationSorting
        • NotificationSortingMap
        • NotificationSubscribeInfo
        • NotificationSubscriber
        • NotificationTemplate
        • NotificationUserInput
      • Common Events
        • Common Events of the Ability Subsystem
        • Common Events of the Bundle Management Subsystem
        • Common Events of the Notification Service
        • Common Events of the Resource Scheduler Subsystem
        • Common Events of the Window Management Subsystem
        • Common Events of the Network Management Subsystem
        • Common Events of the SMS Application
        • Common Events of the Telephony Subsystem
        • Common Events of the Power Management Subsystem
        • Common Events of the NFC Subsystem
        • Common Events of the Wi-Fi Subsystem
        • Common Events of the USB Subsystem
        • Common Events of the File Management Subsystem
        • Common Events of the Theme Framework - Lock Screen
        • Common Events of the Time and Time Zone Subsystem
        • Common Events of the Account Subsystem
    • Bundle Management
      • @ohos.bundle.appControl (appControl)
      • @ohos.bundle.bundleManager (bundleManager)
      • @ohos.bundle.bundleMonitor (bundleMonitor)
      • @ohos.bundle.defaultAppManager (Default Application Management)
      • @ohos.bundle.distributedBundleManager (distributedBundleManager)
      • @ohos.bundle.freeInstall (freeInstall)
      • @ohos.bundle.installer (installer)
      • @ohos.bundle.launcherBundleManager (launcherBundleManager)
      • @ohos.bundle.overlay (overlay)
      • @ohos.zlib (Zip)
      • bundleManager
        • abilityInfo
        • applicationInfo
        • AppProvisionInfo
        • bundleInfo
        • BundlePackInfo
        • BusinessAbilityInfo
        • dispatchInfo
        • elementName
        • extensionAbilityInfo
        • hapModuleInfo
        • launcherAbilityInfo
        • metadata
        • OverlayModuleInfo
        • permissionDef
        • remoteAbilityInfo
        • SharedBundleInfo
        • shortcutInfo
    • UI Page
      • @ohos.animator (Animator)
      • @ohos.arkui.componentSnapshot (Component Snapshot)
      • @ohos.arkui.componentUtils (componentUtils)
      • @ohos.arkui.dragController (DragController)
      • @ohos.arkui.drawableDescriptor (DrawableDescriptor)
      • @ohos.arkui.inspector (Layout Callback)
      • @ohos.arkui.UIContext (UIContext)
      • @ohos.curves (Interpolation Calculation)
      • @ohos.font (Custom Font Registration)
      • @ohos.matrix4 (Matrix Transformation)
      • @ohos.measure (Text Measurement)
      • @ohos.mediaquery (Media Query)
      • @ohos.pluginComponent (PluginComponentManager)
      • @ohos.promptAction (Prompt)
      • @ohos.router (Page Routing)
      • @ohos.uiAppearance (UI Appearance)
      • getContext
    • Graphics
      • @ohos.animation.windowAnimationManager (Window Animation Management)
      • @ohos.application.WindowExtensionAbility (WindowExtensionAbility)
      • @ohos.display (Display)
      • @ohos.effectKit (Image Effects)
      • @ohos.graphics.colorSpaceManager (Color Space Management)
      • @ohos.screen (Screen)
      • @ohos.screenshot (Screenshot)
      • @ohos.window (Window)
    • Multimedia
      • @ohos.app.ability.MediaControlExtensionAbility (ExtensionAbility for Media Playback Control)
      • @ohos.multimedia.audio (Audio Management)
      • @ohos.multimedia.avsession (AVSession Management)
      • @ohos.multimedia.camera (Camera Management)
      • @ohos.multimedia.image (Image Processing)
      • @ohos.multimedia.media (Media)
      • @ohos.multimedia.systemSoundManager (System Sound Management)
      • application
        • MediaControlExtensionContext (ExtensionAbility Context for Media Playback Control)
      • multimedia
        • ringtonePlayer (Ringtone Player)
        • soundPool (Sound Pool)
    • Resource Management
      • @ohos.i18n (Internationalization)
      • @ohos.intl (Internationalization)
      • @ohos.resourceManager (Resource Manager)
    • Background Task
      • @ohos.distributedMissionManager (Distributed Mission Management)
      • @ohos.reminderAgentManager (Agent-Powered Reminders)
      • @ohos.resourceschedule.backgroundTaskManager (Background Task Management)
      • @ohos.resourceschedule.workScheduler (Deferred Task Scheduling)
      • @ohos.resourceschedule.usageStatistics (Device Usage Statistics)
      • @ohos.WorkSchedulerExtensionAbility (Deferred Task Scheduling Callbacks)
      • application
        • WorkSchedulerExtensionContext
    • Security
      • @ohos.abilityAccessCtrl (Ability Access Control)
      • @ohos.dlpPermission (DLP)
      • @ohos.privacyManager (Privacy Management)
      • @ohos.security.cert (Certificate)
      • @ohos.security.cryptoFramework (Crypto Framework)
      • @ohos.security.huks (HUKS)
      • @ohos.userIAM.faceAuth (Facial Authentication)
      • @ohos.userIAM.userAuth (User Authentication)
      • security
        • PermissionRequestResult
    • Data Management
      • @ohos.data.cloudData (Device-Cloud Synergy)
      • @ohos.data.dataAbility (DataAbility Predicates)
      • @ohos.data.dataShare (DataShare)
      • @ohos.data.dataSharePredicates (DataShare Predicates)
      • @ohos.data.dataShareResultSet (DataShare Result Set)
      • @ohos.data.distributedDataObject (Distributed Data Object)
      • @ohos.data.distributedKVStore (Distributed KV Store)
      • @ohos.data.preferences (User Preferences)
      • @ohos.data.relationalStore (RDB Store)
      • @ohos.data.unifiedDataChannel (Unified Data Channel)
      • @ohos.data.uniformTypeDescriptor (Standard Data Definition)
      • @ohos.data.ValuesBucket (Value Bucket)
    • File Management
      • @ohos.application.BackupExtensionAbility (BackupExtensionAbility)
      • @ohos.file.backup (Backup and Restoration)
      • @ohos.file.cloudSync (Device-Cloud Synchronization)
      • @ohos.file.cloudSyncManager (Device-Cloud Synchronization Management)
      • @ohos.file.environment (Directory Environment Capability)
      • @ohos.file.fileAccess (User File Access and Management)
      • @ohos.file.fileExtensionInfo (User File Extension Information)
      • @ohos.file.fileuri (File URI)
      • @ohos.file.fs (File Management)
      • @ohos.file.hash (File Hash Processing)
      • @ohos.file.photoAccessHelper (Album Management)
      • @ohos.file.picker (File Picker)
      • @ohos.file.recent (Recent File List)
      • @ohos.file.securityLabel (Data Label)
      • @ohos.file.statvfs (File System Space Statistics)
      • @ohos.file.storageStatistics (Application Storage Statistics)
      • @ohos.file.trash (Trash)
      • @ohos.file.volumeManager (Volume Management)
      • @ohos.filemanagement.userFileManager (User Data Management)
      • @ohos.fileshare (File Sharing)
    • AI
      • @ohos.ai.mindSporeLite (Inference)
      • @ohos.ai.intelligentVoice (Intelligent Voice)
    • Telephony Service
      • @ohos.contact (Contacts)
      • @ohos.telephony.call (Call)
      • @ohos.telephony.data (Cellular Data)
      • @ohos.telephony.observer (Observer)
      • @ohos.telephony.radio (Network Search)
      • @ohos.telephony.sim (SIM Management)
      • @ohos.telephony.sms (SMS)
    • Network Management
      • @ohos.net.connection (Network Connection Management)
      • @ohos.net.ethernet (Ethernet Connection Management)
      • @ohos.net.http (Data Request)
      • @ohos.net.policy (Network Policy Management)
      • @ohos.net.mdns (mDNS Management)
      • @ohos.net.sharing (Network Sharing)
      • @ohos.net.socket (Socket Connection)
      • @ohos.net.statistics (Traffic Management)
      • @ohos.net.vpn (VPN Management)
      • @ohos.net.webSocket (WebSocket Connection)
      • @ohos.request (Upload and Download)
    • Connectivity
      • @ohos.bluetooth.a2dp (Bluetooth A2DP Module) (Recommended)
      • @ohos.bluetooth.access (Bluetooth Access Module) (Recommended)
      • @ohos.bluetooth.baseProfile (Bluetooth baseProfile Module) (Recommended)
      • @ohos.bluetooth.ble (Bluetooth BLE Module) (Recommended)
      • @ohos.bluetooth.connection (Bluetooth connection Module) (Recommended)
      • @ohos.bluetooth.constant (Bluetooth constant Module) (Recommended)
      • @ohos.bluetooth.hfp (Bluetooth hfp Module) (Recommended)
      • @ohos.bluetooth.hid (Bluetooth hid Module) (Recommended)
      • @ohos.bluetooth.pan (Bluetooth pan Module) (Recommended)
      • @ohos.bluetooth.socket (Bluetooth socket Module) (Recommended)
      • @ohos.bluetooth (Bluetooth) (To Be Deprecated Soon)
      • @ohos.bluetoothManager (Bluetooth) (To Be Deprecated Soon)
      • @ohos.connectedTag (Active Tags)
      • @ohos.nfc.cardEmulation (Standard NFC Card Emulation)
      • @ohos.nfc.controller (Standard NFC)
      • @ohos.nfc.tag (Standard NFC Tags)
      • @ohos.rpc (RPC)
      • @ohos.secureElement (SE Management)
      • @ohos.wifiManager (WLAN) (Recommended)
      • @ohos.wifiManagerExt (WLAN Extension) (Recommended)
      • @ohos.wifi (WLAN) (To Be Deprecated Soon)
      • @ohos.wifiext (WLAN Extension) (To Be Deprecated Soon)
      • tag
        • nfctech (Standard NFC Technologies)
        • tagSession (Standard NFC Tag Session)
    • Basic Features
      • @ohos.accessibility (Accessibility)
      • @ohos.accessibility.config (System Accessibility Configuration)
      • @ohos.accessibility.GesturePath (Gesture Path)
      • @ohos.accessibility.GesturePoint (Gesture Point)
      • @ohos.application.AccessibilityExtensionAbility (AccessibilityExtensionAbility)
      • @ohos.base (Public Callback Information)
      • @ohos.faultLogger (FaultLogger)
      • @ohos.hichecker (HiChecker)
      • @ohos.hidebug (HiDebug)
      • @ohos.hilog (HiLog)
      • @ohos.hiSysEvent (System Event Logging)
      • @ohos.hiTraceChain (Distributed Call Chain Tracing)
      • @ohos.hiTraceMeter (Performance Tracing)
      • @ohos.hiviewdfx.hiAppEvent (Application Event Logging)
      • @ohos.inputMethod (Input Method Framework)
      • @ohos.inputMethodEngine (Input Method Service)
      • @ohos.InputMethodExtensionAbility (InputMethodExtensionAbility)
      • @ohos.InputMethodExtensionContext (InputMethodExtensionContext)
      • @ohos.InputMethodSubtype (Input Method Subtype)
      • @ohos.logLibrary (Log Library)
      • @ohos.pasteboard (Pasteboard)
      • @ohos.print (Print)
      • @ohos.screenLock (Screenlock)
      • @ohos.systemDateTime (System Time and Time Zone)
      • @ohos.systemTimer (System Timer)
      • @ohos.wallpaper (Wallpaper)
      • @ohos.WallpaperExtensionAbility (WallpaperExtensionAbility)
      • @ohos.web.webview (Webview)
      • Console
      • Timer
      • syscap
      • application
        • AccessibilityExtensionContext
    • Device Management
      • @ohos.app.ability.DriverExtensionAbility (DriverExtensionAbility)
      • @ohos.batteryInfo (Battery Information)
      • @ohos.batteryStatistics (Battery Statistics)
      • @ohos.brightness (Screen Brightness)
      • @ohos.calendarManager (Calendar Manager)
      • @ohos.charger (Charging Type)
      • @ohos.cooperate (Screen Hopping)
      • @ohos.deviceAttest (Device Attestation)
      • @ohos.deviceStatus.dragInteraction (Drag)
      • @ohos.deviceInfo (Device Information)
      • @ohos.distributedDeviceManager (Device Management)
      • @ohos.distributedHardware.deviceManager (Device Management)
      • @ohos.driver.deviceManager (Peripheral Management)
      • @ohos.geoLocationManager (Geolocation Manager)
      • @ohos.multimodalInput.gestureEvent (Gesture Input Event)
      • @ohos.multimodalInput.inputConsumer (Input Consumer)
      • @ohos.multimodalInput.inputDevice (Input Device)
      • @ohos.multimodalInput.inputEvent (Input Event)
      • @ohos.multimodalInput.inputEventClient (Key Event Injection)
      • @ohos.multimodalInput.inputMonitor (Input Monitor)
      • @ohos.multimodalInput.intentionCode (Intention Code)
      • @ohos.multimodalInput.keyCode (Key Code)
      • @ohos.multimodalInput.keyEvent (Key Event)
      • @ohos.multimodalInput.mouseEvent (Mouse Event)
      • @ohos.multimodalInput.pointer (Mouse Pointer)
      • @ohos.multimodalInput.touchEvent (Touch Event)
      • @ohos.multimodalInput.shortKey (Shortcut Key)
      • @ohos.power (System Power Management)
      • @ohos.resourceschedule.deviceStandby (Device Standby)
      • @ohos.runningLock (Runninglock)
      • @ohos.sensor (Sensor)
      • @ohos.settings (Data Item Settings)
      • @ohos.stationary (Device Status Awareness Framework)
      • @ohos.systemCapability (SystemCapability)
      • @ohos.systemParameterEnhance (System Parameter)
      • @ohos.thermal (Thermal Management)
      • @ohos.update (Update)
      • @ohos.usbManager (USB Manager)
      • @ohos.vibrator (Vibrator)
      • application
        • DriverExtensionContext
    • Account Management
      • @ohos.account.appAccount (App Account Management)
      • @ohos.account.distributedAccount (Distributed Account Management)
      • @ohos.account.osAccount (OS Account Management)
    • Customization
      • @ohos.configPolicy (Configuration Policy)
    • Enterprise Device Management
      • Enterprise Device Management Overview (for System Applications Only)
      • @ohos.enterprise.accountManager (Account Management)
      • @ohos.enterprise.adminManager (Enterprise Device Management)
      • @ohos.enterprise.applicationManager (Application Management)
      • @ohos.enterprise.browser (Browser Management)
      • @ohos.enterprise.bundleManager (Bundle Management)
      • @ohos.enterprise.dateTimeManager (System Time Management)
      • @ohos.enterprise.deviceControl (Device Control Management)
      • @ohos.enterprise.deviceInfo (Device Information Management)
      • @ohos.enterprise.deviceSettings (Device Settings Management)
      • @ohos.enterprise.EnterpriseAdminExtensionAbility (EnterpriseAdminExtensionAbility)
      • @ohos.enterprise.networkManager (Network Management)
      • @ohos.enterprise.restrictions (Restrictions)
      • @ohos.enterprise.usbManager (USB Management)
      • @ohos.enterprise.wifiManager (Wi-Fi Management)
    • Common Library
      • @ohos.buffer (Buffer)
      • @ohos.convertxml (XML-to-JavaScript Conversion)
      • @ohos.process (Obtaining Process Information)
      • @ohos.taskpool (Using the Task Pool)
      • @ohos.uri (URI String Parsing)
      • @ohos.url (URL String Parsing)
      • @ohos.util (util)
      • @ohos.util.ArrayList (Linear Container ArrayList)
      • @ohos.util.Deque (Linear Container Deque)
      • @ohos.util.HashMap (Nonlinear Container HashMap)
      • @ohos.util.HashSet (Nonlinear Container HashSet)
      • @ohos.util.LightWeightMap (Nonlinear Container LightWeightMap)
      • @ohos.util.LightWeightSet (Nonlinear Container LightWeightSet)
      • @ohos.util.LinkedList (Linear Container LinkedList)
      • @ohos.util.List (Linear Container List)
      • @ohos.util.PlainArray (Nonlinear Container PlainArray)
      • @ohos.util.Queue (Linear Container Queue)
      • @ohos.util.Stack (Linear Container Stack)
      • @ohos.util.TreeMap (Nonlinear Container TreeMap)
      • @ohos.util.TreeSet (Nonlinear Container TreeSet)
      • @ohos.worker (Worker Startup)
      • @ohos.xml (XML Parsing and Generation)
    • Application services
      • @ohos.identifier.oaid (OAID)
    • Test
      • @ohos.application.testRunner (TestRunner)
      • @ohos.uitest (UiTest)
    • APIs No Longer Maintained
      • @ohos.backgroundTaskManager (Background Task Management)
      • @ohos.bundle (Bundle)
      • @ohos.bundle.innerBundleManager (innerBundleManager)
      • @ohos.bundleState (Device Usage Statistics)
      • @ohos.bytrace (Performance Tracing)
      • @ohos.data.distributedData (Distributed Data Management)
      • @ohos.data.storage (Lightweight Data Storage)
      • @ohos.data.rdb (RDB)
      • @ohos.distributedBundle (Distributed Bundle Management)
      • @ohos.document (File Operation)
      • @ohos.fileio (File Management)
      • @ohos.geolocation (Geolocation)
      • @ohos.hiAppEvent (Application Event Logging)
      • @ohos.multimedia.medialibrary (Media Library Management)
      • @ohos.multimodalInput.inputDeviceCooperate (Screen Hopping)
      • @ohos.prompt (Prompt)
      • @ohos.reminderAgent (Reminder Agent)
      • @ohos.statfs (statfs)
      • @ohos.systemParameter (System Parameter)
      • @ohos.systemTime (System Time and Time Zone)
      • @ohos.usb (USB Management)
      • @ohos.util.Vector (Linear Container Vector)
      • @system.app (Application Context)
      • @system.battery (Battery Information)
      • @system.bluetooth (Bluetooth)
      • @system.brightness (Screen Brightness)
      • @system.cipher (Cipher Algorithm)
      • @system.configuration (Application Configuration)
      • @system.device (Device Information)
      • @system.fetch (Data Request)
      • @system.file (File Storage)
      • @system.geolocation (Geolocation)
      • @system.mediaquery (Media Query)
      • @system.network (Network State)
      • @system.notification (Notification)
      • @system.package (Bundle Management)
      • @system.prompt (Prompt)
      • @system.request (Upload and Download)
      • @system.router (Page Routing)
      • @system.sensor (Sensor)
      • @system.storage (Data Storage)
      • @system.vibrator (Vibrator)
      • bundle
        • abilityInfo
        • applicationInfo
        • bundleInfo
        • bundleInstaller
        • bundleStatusCallback
        • customizeData
        • elementName
        • hapModuleInfo
        • launcherAbilityInfo
        • moduleInfo
        • PermissionDef
        • remoteAbilityInfo
        • shortcutInfo
      • data/rdb
        • resultSet
  • Component Reference (ArkTS-based Declarative Development Paradigm)
    • Component Overview
    • Universal Component Information
      • Universal Events
        • Click Event
        • Touch Event
        • Show/Hide Event
        • Drag/Drop Event
        • Key Event
        • Focus Event
        • Mouse Event
        • Component Area Change Event
        • Visible Area Change Event
        • Custom Keyboard Shortcuts
      • Universal Attributes
        • Size
        • Location
        • Layout Constraints
        • Flex Layout
        • Border
        • Border Image
        • Background
        • Opacity
        • Visibility
        • Enable/Disable
        • Overlay
        • Z-order Control
        • Transformation
        • Image Effect Configuration
        • Shape Clipping
        • Grid
        • Gradient Color
        • Popup Control
        • Menu Control
        • Focus Control
        • Hover Effect
        • Component ID
        • Polymorphic Style
        • restoreId
        • Foreground Color
        • Foreground Blur
        • Click Effect
        • Accessibility
        • Touch Interactions
          • Touch Target
          • Hit Test Control
        • Transition
          • Modal Transition
          • Sheet Transition
        • Obscuring
        • Universal Text Attributes
        • Drag and Drop Control
        • Safe Area
        • Special Effect Drawing Combination
        • Render Fit
      • Gesture Handling
        • Gesture Binding Methods
        • Basic Gestures
          • TapGesture
          • LongPressGesture
          • PanGesture
          • PinchGesture
          • RotationGesture
          • SwipeGesture
        • Combined Gestures
    • Basic Components
      • AlphabetIndexer
      • Blank
      • Button
      • CalendarPicker
      • Checkbox
      • CheckboxGroup
      • DataPanel
      • DatePicker
      • Divider
      • FormComponent
      • Gauge
      • Image
      • ImageAnimator
      • ImageSpan
      • LoadingProgress
      • Marquee
      • Menu
      • MenuItem
      • MenuItemGroup
      • Navigation
      • NavRouter
      • NavDestination
      • PatternLock
      • PluginComponent
      • Progress
      • QRCode
      • Radio
      • Rating
      • RemoteWindow
      • RichEditor
      • RichText
      • ScrollBar
      • Search
      • Select
      • Slider
      • Span
      • Stepper
      • StepperItem
      • Text
      • TextArea
      • TextClock
      • TextInput
      • TextPicker
      • TextTimer
      • TimePicker
      • Toggle
      • Web
      • XComponent
    • Container Components
      • Badge
      • Column
      • ColumnSplit
      • Counter
      • EffectComponent
      • Flex
      • FlowItem
      • FormLink
      • GridCol
      • GridRow
      • Grid
      • GridItem
      • Hyperlink
      • List
      • ListItem
      • ListItemGroup
      • Navigator
      • Panel
      • Refresh
      • RelativeContainer
      • Row
      • RowSplit
      • Scroll
      • SideBarContainer
      • Stack
      • Swiper
      • Tabs
      • TabContent
      • UIExtensionComponent
      • WaterFlow
    • Media Components
      • Video
    • Drawing Components
      • Circle
      • Ellipse
      • Line
      • Polyline
      • Polygon
      • Path
      • Rect
      • Shape
    • Canvas Components
      • Canvas
      • CanvasGradient
      • CanvasPattern
      • CanvasRenderingContext2D
      • ImageBitmap
      • ImageData
      • Matrix2D
      • OffscreenCanvas
      • OffscreenCanvasRenderingContext2D
      • Path2D
    • Advanced Components
      • @ohos.arkui.advanced.ComposeListItem (List)
      • @ohos.arkui.advanced.ComposeTitleBar (One- or Two-Row Title Bar with Profile Picture)
      • @ohos.arkui.advanced.Dialog (Dialog Box)
      • @ohos.arkui.advanced.EditableTitleBar (Editable Title Bar)
      • @ohos.arkui.advanced.Filter (Advanced Filter)
      • @ohos.arkui.advanced.ProgressButton (Download Button with Progress Indicator)
      • @ohos.arkui.advanced.SelectTitleBar (Drop-down Title Bar)
      • @ohos.arkui.advanced.SplitLayout (Split Layout)
      • @ohos.arkui.advanced.SubHeader (Subheader)
      • @ohos.arkui.advanced.SwipeRefresher (Swipe Refresher)
      • @ohos.arkui.advanced.TabTitleBar (Tab Title Bar)
      • @ohos.arkui.advanced.ToolBar (Toolbar)
      • @ohos.arkui.advanced.TreeView (Tree View)
      • @ohos.multimedia.avCastPicker (AVCastPicker)
    • Security Components
      • Security Component Universal Attributes
      • LocationButton
      • PasteButton
      • SaveButton
    • Animation
      • Property Animation (animation)
      • Explicit Animation (animateTo)
      • Transition Animation
        • Page Transition (pageTransition)
        • Component Transition (transition)
        • Shared Element Transition (sharedTransition)
        • Implicit Shared Element Transition (geometryTransition)
      • Motion Path Animation (motionPath)
      • Particle Animation (Particle)
    • Global UI Methods
      • Pop-up Window
        • Alert Dialog Box (AlertDialog)
        • Action Sheet (ActionSheet)
        • Custom Dialog Box (CustomDialog)
        • Calendar Picker Dialog Box (CalendarPickerDialog)
        • Date Picker Dialog Box (DatePickerDialog)
        • Time Picker Dialog Box (TimePickerDialog)
        • Text Picker Dialog Box (TextPickerDialog)
      • Menu
    • Custom Component Lifecycle
    • State Management with Application-level Variables
    • Pixel Units
    • Enums
    • Types
    • Components No Longer Maintained
      • AbilityComponent
      • GridContainer
    • APIs No Longer Maintained
      • Click Control
  • Component Reference (JavaScript-compatible Web-like Development Paradigm - ArkUI.Full)
    • Universal Component Information
      • Universal Attributes
      • Universal Styles
      • Universal Events
      • Universal Methods
      • Animation Styles
      • Gradient Styles
      • Transition Styles
      • Media Query
      • Custom Font Styles
      • Atomic Layout
    • Container Components
      • badge
      • dialog
      • div
      • form
      • list
      • list-item
      • list-item-group
      • panel
      • popup
      • refresh
      • stack
      • stepper
      • stepper-item
      • swiper
      • tabs
      • tab-bar
      • tab-content
    • Basic Components
      • button
      • chart
      • divider
      • image
      • image-animator
      • input
      • label
      • marquee
      • menu
      • option
      • picker
      • picker-view
      • piece
      • progress
      • qrcode
      • rating
      • richtext
      • search
      • select
      • slider
      • span
      • switch
      • text
      • textarea
      • toolbar
      • toolbar-item
      • toggle
      • web
      • xcomponent
    • Media Components
      • video
    • Canvas Components
      • canvas
      • CanvasRenderingContext2D
      • Image
      • CanvasGradient
      • ImageData
      • Path2D
      • ImageBitmap
      • OffscreenCanvas
      • OffscreenCanvasRenderingContext2D
    • Grid Components
      • Basic Concepts
      • grid-container
      • grid-row
      • grid-col
    • SVG Components
      • Universal Attributes
      • svg
      • rect
      • circle
      • ellipse
      • path
      • line
      • polyline
      • polygon
      • text
      • tspan
      • textPath
      • animate
      • animateMotion
      • animateTransform
    • Custom Components
      • Basic Usage
      • props
      • Style Inheritance
      • slot
      • Lifecycle Definition
    • Dynamic Component Creation
    • Data Type Attributes
  • Component Reference (JavaScript-compatible Web-like Development Paradigm - ArkUI.Lite)
    • Framework Overview
      • File Organization
      • "js" Tag
      • app.js
      • Lifecycle
      • Multi-Language Capability
      • Syntax
        • HML
        • CSS
        • JavaScript
    • Universal Component Information
      • Universal Events
      • Universal Attributes
      • Universal Styles
      • Animation Styles
      • Media Query
    • Container Components
      • div
      • list
      • list-item
      • stack
      • swiper
    • Basic Components
      • chart
      • image
      • image-animator
      • input
      • marquee
      • picker-view
      • progress
      • qrcode
      • slider
      • switch
      • text
    • Canvas Components
      • canvas
      • CanvasRenderingContext2D
  • JavaScript Service Widget UI Component Reference
    • JavaScript Service Widget UI Framework
      • File Organization
      • Syntax
        • HML
        • CSS
      • Multi-Language Capability
      • Version Compatibility Adaptation
      • Theme Configuration
    • Universal Components
      • Universal Attributes
      • Universal Styles
      • Universal Events
      • Gradient Styles
      • Media Query
      • Custom Font Styles
      • Accessibility
      • Atomic Layout
    • Container Components
      • badge
      • div
      • list
      • list-item
      • stack
      • swiper
    • Basic Components
      • button
      • calendar
      • chart
      • clock
      • divider
      • image
      • input
      • progress
      • span
      • text
    • Custom Component Basic Usage
    • Data Types
  • Error Codes
    • Universal Error Codes
    • Ability Framework
      • Ability Error Codes
      • Distributed Scheduler Error Codes
      • Form Error Codes
    • AI
      • Intelligent Voice Error Codes
    • Bundle Management
      • Bundle Error Codes
      • zlib Error Codes
    • Common Event and Notification
      • Event Error Codes
      • Notification Error Codes
      • DistributedNotificationService Error Codes
    • UI Page
      • Animator Error Codes
      • promptAction Error Codes
      • Router Error Codes
      • UI Appearance Error Codes
      • Drag Event Error Codes
    • Graphics
      • colorSpaceManager Error Codes
      • Display Error Codes
      • Window Error Codes
    • Multimedia
      • Audio Error Codes
      • Media Error Codes
      • AVSession Management Error Codes
      • Camera Error Codes
      • Image Error Codes
    • Resource Management
      • I18N Error Codes
      • Resource Manager Error Codes
    • Background Task
      • backgroundTaskManager Error Codes
      • DeviceUsageStatistics Error Codes
      • reminderAgentManager Error Codes
      • workScheduler Error Codes
    • Security
      • Access Control Error Codes
      • HUKS Error Codes
      • Crypto Framework Error Codes
      • Certificate Error Codes
      • User Authentication Error Codes
      • DLP Service Error Codes
    • Data Management
      • RDB Error Codes
      • DataShare Error Codes
      • Distributed Data Object Error Codes
      • Distributed KV Store Error Codes
      • User Preference Error Codes
    • File Management
      • File Management Error Codes
    • Telephony Service
      • Telephony Error Codes
    • Network Management
      • Upload and Download Error Codes
      • HTTP Error Codes
      • Socket Error Codes
      • Network Connection Management Error Codes
      • Ethernet Connection Error Codes
      • Network Sharing Error Codes
      • Policy Management Error Codes
      • mDNS Error Codes
      • Traffic Management Error Codes
      • VPN Error Codes
    • Connectivity
      • Bluetooth Error Codes
      • Wi-Fi Error Codes
      • NFC Error Codes
      • SE Error Codes
      • RPC Error Codes
    • Basic Features
      • Accessibility Error Codes
      • FaultLogger Error Codes
      • Application Event Logging Error Codes
      • HiSysEvent Error Codes
      • HiDebug Error Codes
      • Log Library Error Codes
      • Input Method Framework Error Codes
      • Pasteboard Error Codes
      • Screen Lock Management Error Codes
      • Time and Time Zone Service Error Codes
      • Webview Error Codes
    • Account Management
      • Account Management Error Codes
    • Device Management
      • Power Consumption Statistics Error Codes
      • Brightness Error Codes
      • Power Manager Error Codes
      • Running Lock Error Codes
      • Thermal Manager Error Codes
      • Device Management Error Codes
      • Location Subsystem Error Codes
      • Screen Hopping Error Codes
      • Screen Hopping Error Codes (To Be Deprecated Soon)
      • Sensor Error Codes
      • Vibrator Error Codes
      • System Parameter Error Codes
      • USB Error Codes
      • Update Error Codes
    • Customization
      • Enterprise Device Management Error Codes
    • Common Library
      • Common Library Error Codes
    • Application services
      • OAID Error Codes
    • Test
      • UiTest Error Codes
  • Native APIs
    • Native API Introduction
    • Modules
      • Native XComponent
      • HiLog
      • NativeWindow
      • OH_NativeBuffer
      • Drawing
      • OH_NativeImage
      • NativeVsync
      • Image
      • Rawfile
      • RDB
      • MindSpore
      • NeuralNetworkRuntime
      • AVCapability
      • AVMuxer
      • AudioDecoder
      • AudioEncoder
      • CodecBase
      • Core
      • VideoDecoder
      • VideoEncoder
      • AVDemuxer
      • AVSource
      • OHAudio
      • AVScreenCapture
      • HuksKeyApi
      • HuksParamSetApi
      • HuksTypeApi
      • Init
      • Memory
      • UsbDdk
      • Hitrace
      • HiAppEvent
      • Vulkan
      • Bundle
    • Header Files
      • drawing_bitmap.h
      • drawing_brush.h
      • drawing_canvas.h
      • drawing_color.h
      • drawing_font_collection.h
      • drawing_path.h
      • drawing_pen.h
      • drawing_text_declaration.h
      • drawing_text_typography.h
      • drawing_types.h
      • external_window.h
      • image_mdk.h
      • image_mdk_common.h
      • image_pixel_map_mdk.h
      • image_pixel_map_napi.h
      • image_receiver_mdk.h
      • image_source_mdk.h
      • log.h
      • native_buffer.h
      • native_image.h
      • native_interface_xcomponent.h
      • native_xcomponent_key_event.h
      • native_vsync.h
      • raw_dir.h
      • raw_file_manager.h
      • raw_file.h
      • context.h
      • data_type.h
      • format.h
      • model.h
      • status.h
      • tensor.h
      • types.h
      • neural_network_runtime_type.h
      • neural_network_runtime.h
      • avcodec_audio_channel_layout.h
      • native_avcapability.h
      • native_avcodec_audiodecoder.h
      • native_avcodec_audioencoder.h
      • native_avcodec_base.h
      • native_avcodec_videodecoder.h
      • native_avcodec_videoencoder.h
      • native_avdemuxer.h
      • native_averrors.h
      • native_avformat.h
      • native_avmemory.h
      • native_avmuxer.h
      • native_avsource.h
      • native_audiocapturer.h
      • native_audiorenderer.h
      • native_audiostream_base.h
      • native_audiostreambuilder.h
      • native_avscreen_capture.h
      • native_avscreen_capture_base.h
      • native_avscreen_capture_errors.h
      • native_huks_api.h
      • native_huks_param.h
      • native_huks_type.h
      • native_interface_bundle.h
      • oh_cursor.h
      • oh_predicates.h
      • oh_value_object.h
      • oh_values_bucket.h
      • relational_store_error_code.h
      • relational_store.h
      • syscap_ndk.h
      • purgeable_memory.h
      • usb_ddk_api.h
      • usb_ddk_types.h
      • trace.h
      • hiappevent.h
      • hiappevent_cfg.h
      • hiappevent_event.h
      • hiappevent_param.h
      • vulkan_ohos.h
    • Structs
      • OH_Drawing_BitmapFormat
      • OH_NativeBuffer_Config
      • OH_NativeBundle_ApplicationInfo
      • OH_NativeXComponent_Callback
      • OH_NativeXComponent_MouseEvent
      • OH_NativeXComponent_MouseEvent_Callback
      • OH_NativeXComponent_TouchEvent
      • OH_NativeXComponent_TouchPoint
      • OHExtDataHandle
      • OHHDRMetaData
      • OhosImageComponent
      • OhosImageRect
      • OHOS::Media::OhosPixelMapInfo
      • OhosImageDecodingOps
      • OhosImageReceiverInfo
      • OhosImageRegion
      • OhosImageSize
      • OhosImageSource
      • OhosImageSourceDelayTimeList
      • OhosImageSourceInfo
      • OhosImageSourceOps
      • OhosImageSourceProperty
      • OhosImageSourceSupportedFormat
      • OhosImageSourceSupportedFormatList
      • OhosImageSourceUpdateData
      • OhosPixelMapCreateOps
      • OhosPixelMapInfos
      • RawFileDescriptor
      • Region
      • Rect
      • OH_AI_CallBackParam
      • OH_AI_ShapeInfo
      • OH_AI_TensorHandleArray
      • OH_NN_Memory
      • OH_NN_QuantParam
      • OH_NN_Tensor
      • OH_NN_UInt32Array
      • OH_AVCodecAsyncCallback
      • OH_AVCodecBufferAttr
      • OH_AVRange
      • OH_AudioCapturer_Callbacks_Struct
      • OH_AudioRenderer_Callbacks_Struct
      • OH_AudioBuffer
      • OH_AudioCaptureInfo
      • OH_AudioEncInfo
      • OH_AudioInfo
      • OH_AVScreenCaptureCallback
      • OH_AVScreenCaptureConfig
      • OH_RecorderInfo
      • OH_Rect
      • OH_VideoCaptureInfo
      • OH_VideoEncInfo
      • OH_VideoInfo
      • OH_Huks_Blob
      • OH_Huks_CertChain
      • OH_Huks_KeyInfo
      • OH_Huks_KeyMaterial25519
      • OH_Huks_KeyMaterialDh
      • OH_Huks_KeyMaterialDsa
      • OH_Huks_KeyMaterialEcc
      • OH_Huks_KeyMaterialRsa
      • OH_Huks_Param
      • OH_Huks_ParamSet
      • OH_Huks_PubKeyInfo
      • OH_Huks_Result
      • OH_Cursor
      • OH_Predicates
      • OH_Rdb_Config
      • OH_Rdb_Store
      • OH_VBucket
      • OH_VObject
      • UsbConfigDescriptor
      • UsbControlRequestSetup
      • UsbDdkConfigDescriptor
      • UsbDdkEndpointDescriptor
      • UsbDdkInterface
      • UsbDdkInterfaceDescriptor
      • UsbDeviceDescriptor
      • UsbDeviceMemMap
      • UsbEndpointDescriptor
      • UsbInterfaceDescriptor
      • UsbRequestPipe
      • VkExternalFormatOHOS
      • VkImportNativeBufferInfoOHOS
      • VkMemoryGetNativeBufferInfoOHOS
      • VkNativeBufferFormatPropertiesOHOS
      • VkNativeBufferPropertiesOHOS
      • VkNativeBufferUsageOHOS
      • VkSurfaceCreateInfoOHOS
    • Standard Libraries
      • libc
      • c++
      • Node-API
      • libuv
      • OpenSL ES
      • OpenGL ES
      • EGL
      • Zlib
      • Vulkan
      • Appendix
        • libc Symbols Not Exported
        • libc Symbols That May Fail to Call Due to Permission Control
        • EGL Symbols Exported
        • OpenGL ES 3.0 Symbols Exported
        • Vulkan Symbols Exported
• FAQs
  • Full SDK Compilation Guide
  • Guide to Switching to Full SDK
  • Using Native APIs (NDK) of the OpenHarmony SDK in a CMake Project
  • Application Model Development
  • ArkUI Framework Development (ArkTS)
    • ArkTS Syntax Usage
    • ArkUI Component Development (ArkTS)
    • ArkUI Layout Development (ArkTS)
    • ArkUI Routing/Navigation Development (ArkTS)
    • ArkUI Animation/Interaction Event Development (ArkTS)
  • ArkUI Development (JS)
  • ArkTS Common Library Development
  • Web Development
  • Bundle Management Development
  • Resource Manager Development
  • Common Event and Notification Development
  • Graphics Development
  • Window Management Development
  • Multimedia Development
  • Basic Security Capability Development
  • Ability Access Control Development
  • Data Management Development
  • File Management Development
  • Network Management Development
  • DFX Development
  • Pan-Sensor Development
  • Startup Development
  • Distributed Device Development
  • SDK Usage
  • NDK Usage
  • Compiler and Runtime Development
  • Usage of Third- and Fourth-Party Libraries