MicroEJ Developer
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Get Started
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    • Getting Started
    • MICROEJ VEE
    • MICROEJ SDK
  • SDK User Guide
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      • Install Latest SDK Distribution
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        • Install SDK Distribution 21.11
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        • Get your Machine UID
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        • USB Dongle on GNU/Linux
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        • Troubleshooting
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    • Module Repositories
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      • Startup
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      • Resolve Foundation Libraries in Workspace
      • Resolve Front Panel in Workspace
    • SDK Version
    • MicroEJ Module Manager
      • Introduction
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      • Module Project Skeleton
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        • Enable MMM Semantic
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        • Automatic Update Before Resolution
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        • Preferences Page
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        • Meta Build creation
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        • Unresolved Dependency
        • Invalid Certificate
        • Target “simulator:run” does not exist
      • Former SDK Versions (lower than 5.2.0)
        • New MicroEJ Module Project
        • Preferences Pages
        • Build Kit
      • Former SDK Versions (from 5.2.0 to 5.3.x)
        • Build Kit
    • Release Notes
    • SDK Distribution Changelog
      • [23.07] - 2023-07-03
      • [23.02] - 2022-02-28
      • [22.06] - 2022-06-29
      • [21.11] - 2021-11-15
      • [21.03] - 2021-03-25
      • [20.12] - 2020-12-11
      • [20.10] - 2020-10-30
      • [20.07] - 2020-07-28
      • [19.05] - 2019-05-17
      • [19.02] - 2019-02-22
    • SDK Changelog
      • [5.8.1] - 2023-09-19
        • General
        • MicroEJ Module Manager
      • [5.8.0] - 2023-07-03
        • General
        • MicroEJ Module Manager
      • [5.7.0] - 2023-02-27
        • General
        • MicroEJ Module Manager
      • [5.6.2] - 2022-08-31
        • General
        • MicroEJ Module Manager
      • [5.6.1] - 2022-07-08
        • General
      • [5.6.0] - 2022-06-29
        • General
        • MicroEJ Module Manager
      • [5.5.3] - 2022-05-03
        • MicroEJ Module Manager
      • [5.5.2] - 2021-12-22
        • General
        • MicroEJ Module Manager
      • [5.5.1] - 2021-12-02
        • General
      • [5.5.0] - 2021-11-15
        • General
        • MicroEJ Module Manager
      • [5.4.1] - 2021-04-16
        • MicroEJ Module Manager
      • [5.4.0] - 2021-03-25
        • Known Issues
        • General
        • MicroEJ Module Manager
      • [5.3.1] - 2020-12-11
        • General
        • MicroEJ Module Manager
      • [5.3.0] - 2020-10-30
        • Known Issues
        • General
        • MicroEJ Module Manager
      • [5.2.0] - 2020-07-28
        • General
        • MicroEJ Module Manager
        • Misc
      • [5.1.2] - 2020-03-09
        • MicroEJ Module Manager
      • [5.1.1] - 2019-09-26
        • General
      • [5.1.0] - 2019-05-17
        • General
        • MicroEJ Module Manager
      • [5.0.1] - 2019-02-14
        • General
        • MicroEJ Module Manager
    • Build Types per SDK
    • Migration Notes
      • From 5.2.x to 5.3.x or more
        • Workspace migration warning
      • From 5.1.x to 5.2.x
        • Enable New Wizards Shortcuts in MicroEJ Perspective
        • Re-enable the Ivy Preferences Pages (Advanced Use)
      • From 4.1.x to 5.x
        • Wadapps Application Update
        • MicroEJ Module Manager Update
        • Meta build Project Update
  • Application Developer Guide
    • Introduction
    • Standalone Application
      • Platform Import
        • Source Platform Import
        • Binary Platform Import
      • Build and Run an Application
        • Create a MicroEJ Standalone Application
        • Run on the Simulator
        • Run on the Device
      • Build Output Files
        • Launch Output Folder
        • Published Module Files
        • The SOAR Map File
        • The SOAR Information File
      • MicroEJ Launch
        • Main Tab
        • Execution Tab
        • Configuration Tab
        • JRE Tab
        • Source Tab
        • Common Tab
      • Application Options
        • Introduction
        • Defining an Option
        • Category: Runtime
        • Category: Simulator
        • Category: Libraries
        • Category: Device
        • Category: Feature
      • SOAR
        • Java Symbols Encoding
        • Class Initialization Code
        • Method Devirtualization
        • Method Inlining
    • Sandboxed Application
      • Create a First Application
        • Entry Point
        • Configuration
        • SSL Certificate
        • Module Descriptor
      • Run on the Simulator
        • From the SDK
        • From the Command Line Interface
      • Run on the Device
        • Local Deployment
        • Remote Deployment
      • Fundamental Concepts
      • Shared Interfaces
        • Principle
        • Shared Interface Usage
        • Transferable Types
        • Implementing the Proxy Class
    • MicroEJ Libraries
    • Virtual Device
    • MicroEJ Runtime
      • Language
      • Core Libraries
        • Embedded Device Configuration (EDC)
        • Beyond Profile (BON)
        • Simple Native Interface (SNI)
        • Kernel & Features (KF)
      • Scheduler
      • Garbage Collector
      • Limitations
        • Primitive Types
    • Module Natures
      • Add-On Library
      • Add-On Processor
      • Foundation Library API
      • Foundation Library Implementation
      • Kernel Application
      • Meta Build
      • Mock
      • Module Repository
      • Runtime Environment
      • Sandboxed Application
      • Standalone Application
      • Studio Rebranding
      • Natures Plugins
        • Java Compilation
        • Platform Loader
        • Javadoc
        • Test Suite
        • J2SE Unit Tests
        • Artifact Checker
      • Global Build Options
    • Module Repository
      • Create a Repository Project
      • Configure Resolver for Input Modules
      • Configure Consistency Check
      • Advanced Options
      • Include Modules
        • Include a Single Module
        • Include a Module Repository
      • Generate Javadoc
      • Build the Repository
      • Use the Offline Repository
    • MicroEJ Classpath
      • Application Classpath
      • Classpath Load Model
      • Classpath Elements
        • Application Entry Points
        • Types
        • Resources
        • Immutable Objects
        • System Properties
        • Constants
    • Application Resources
    • Native Language Support
      • Introduction
      • Principle
      • Localization Source Files
      • NLS List Files
      • Usage
        • Plural Forms
        • Dealing With Missing Translations
      • BinaryNLS Resource Generation
      • Limitations
      • NLS External Loader Tool
        • Installation
        • Usage
        • Troubleshooting
        • Crowdin
    • Debug an Application
      • Debug on Simulator
      • Debug on Device
      • Get Library Sources
        • Add-On Library Sources
        • Foundation Library Sources
    • Platform Selection
    • Development Tools
      • Test Suite with JUnit
        • Principle
        • JUnit Compliance
        • Setup a VEE Port for Tests
        • Setup a Project with a JUnit Test Case
        • Build and Run a JUnit Test Suite
        • Test Suite Reports
        • Configure the Execution on your Device
        • Advanced Configurations
      • Stack Trace Reader
        • Principle
        • Functional Description
        • Dependencies
        • Installation
        • Use (Standalone Application)
        • Use (Sandboxed Application)
        • Stack Trace Reader Options
      • Code Coverage Analyzer
        • Principle
        • Functional Description
        • Dependencies
        • Installation
        • Use
      • Heap Usage Monitoring
        • Introduction
        • Heap Usage Introspection
        • Automatic Heap Usage Monitoring
        • Heap Usage Analysis
      • Heap Dumper & Heap Analyzer
        • Introduction
        • Heap Dumper
        • Heap Viewer
        • Progressive Heap Usage
        • Compare Heap Dumps
      • Serial to Socket Transmitter
        • Principle
        • Installation
        • Use
      • Memory Map Analyzer
        • Principle
        • Functional Description
        • Dependencies
        • Installation
        • Use
      • Event Tracing
        • Description
        • Event Recording
        • Java API Usage
        • Platform Implementation
        • Advanced Event Tracing
      • Null Analysis
        • Principle
        • Java Code Annotation
        • Module Project Configuration
        • MicroEJ Libraries
        • Advanced Use
        • Troubleshooting
      • Dependency Discoverer
        • Introduction
        • Installation
        • Use
    • Advanced Tools
      • MicroEJ Linker
        • Overview
        • ELF Overview
        • Linking Process
        • Linker Specific Configuration File Specification
        • Auto-generated Sections
        • Execution
        • Error Messages
        • Map File Interpretor
      • MicroEJ Test Suite Engine
        • Introduction
        • Using the MicroEJ Test Suite Ant Tasks
        • Using the Trace Analyzer
        • Appendix
      • VEE Debugger Proxy
        • Principle
        • Generate a Core Dump File on Linux using GDB
        • Start the Proxy
    • Graphical User Interface
      • MicroUI
        • Introduction
        • Drawing Logs
        • Images
        • Fonts
        • Font Designer
        • Application Options
        • Debug Traces
        • Error Messages
        • Migration Guide
      • MicroVG
        • Introduction
        • Path
        • Matrix
        • Linear Gradient
        • Vector Fonts
        • Vector Images
        • Debug Traces
        • Android Vector Drawable Loader
      • MWT (Micro Widget Toolkit)
        • Introduction
        • Concepts
        • How to Create a Widget
        • How to Create a Container
        • How to Animate a Widget
        • How to Define an Outline or Border
        • How to Define a Background
        • How to Create a Desktop Event Dispatcher
        • How to Define an Extra Style Field
        • How to Use the Overlap Render Policy
        • How to Debug
      • Widgets and Examples
        • Widget Library
        • Widget Demo
        • MWT Examples
      • Advanced
        • How to Detect Text Overflow
        • MicroUI Flush Visualizer
    • JavaScript
      • Getting Started
      • Sources Management
        • JavaScript Sources Location
        • JavaScript Sources Load Order
        • JavaScript Sources Load Scope
        • JavaScript Sources Processing
      • Examples
        • Simple Application
        • Use a Java API in JavaScript
        • Create a JavaScript API from Java
      • API
        • Built-in Objects
        • Host Objects
      • Communication Between Java and JS
        • JavaScript Engine
        • Calling Java from JavaScript
        • Calling JavaScript from Java
        • Passing Values Between JavaScript and Java
      • Tests
      • Limitations
        • Unsupported Directives
        • Unsupported Statements
        • Unsupported Built-in Objects
      • Troubleshooting
        • Compilation error cannot be resolved to a type in FFI class
      • Internals
        • JavaScript Sources Processing
        • Foreign Function Interface
    • Networking
      • Foundation Libraries
      • Add-On Libraries
        • IoT Libraries
        • Data Serialization Libraries
        • Cloud Agent Libraries
      • HOKA Web Server
        • Intended Audience
        • Getting Started
        • Routes Mapping
        • Request
        • Response
        • Halt Request Processing Chain
        • Filters
        • Error Handling
        • Static Files
        • Web Server Configuration
        • Handle Encoding
        • Session
        • HOKA Configuration
    • Event Queue
      • Principle
      • Functional Description
        • Overview
        • Architecture
        • Event format
        • Event Queue listener
        • Standard event
        • Extended event
        • Mock the Event Queue
      • Use
    • Character Encoding
      • Default Encoding
      • UTF-8 Encoding
      • Custom Encoding
      • Console Output
        • Set Encoding in MicroEJ SDK Console
    • Limitations
  • VEE Porting Guide
    • Introduction
      • Scope
      • Intended Audience
    • MicroEJ Platform
      • Introduction
      • Build Process
      • Concepts
        • MicroEJ Platform Configuration
        • Modules
        • Low Level API Pattern
    • MicroEJ Architecture
      • Naming Convention
      • Architectures Changelog
        • Notation
        • [8.0.0] - 2023-06-27
        • [7.20.1] - 2023-04-10
        • [7.20.0] - 2023-04-04
        • [7.19.0] - 2023-02-16
        • [7.18.1] - 2022-10-26
        • [7.18.0] - 2022-09-14
        • [7.17.0] - 2022-06-13
        • [7.16.0] - 2021-06-24
        • [7.15.1] - 2021-02-19
        • [7.15.0] - 2020-12-17
        • [7.14.1] - 2020-11-30
        • [7.14.0] - 2020-09-25
        • [7.13.3] - 2020-09-18
        • [7.13.2] - 2020-08-14
        • [7.13.1] - 2020-07-20
        • [7.13.0] - 2020-07-03
        • [7.12.0] - 2019-10-16
        • [7.11.0] - 2019-06-24
        • [7.10.1] - 2019-04-03
        • [7.10.0] - 2019-03-29
        • [7.9.1] - 2019-01-08
        • [7.9.0] - 2018-09-20
        • [7.8.0] - 2018-08-01
        • [7.7.0] - 2018-07-19
        • [7.6.0] - 2018-06-29
        • [7.5.0] - 2018-06-15
        • [7.4.0] - 2018-06-13
        • [7.3.0] - 2018-03-07
        • [7.2.0] - 2018-03-02
        • [7.1.2] - 2018-02-02
        • [maintenance/6.18.0] - 2017-12-15
        • [7.1.1] - 2017-12-08
        • [7.1.0] - 2017-12-08
        • [7.0.0] - 2017-11-07
        • [6.17.2] - 2017-10-26
        • [6.17.1] - 2017-10-25
        • [6.17.0] - 2017-10-10
        • [6.16.0] - 2017-09-27
        • [6.15.0] - 2017-09-12
        • [6.14.2] - 2017-08-24
        • [6.14.1] - 2017-08-02
        • [6.13.0] - 2017-07-21
        • [6.12.0] - 2017-07-07
        • [6.11.0] - 2017-06-13
        • [6.11.0-beta1] - 2017-06-02
        • [6.10.0] - 2017-06-02
        • [6.9.2] - 2017-06-02
        • [6.9.1] - 2017-05-29
        • [6.9.0] - 2017-03-15
    • MicroEJ Packs
      • Overview
      • Naming Convention
        • Architecture Specific Pack
        • Generic Pack
    • Platform Creation
      • Architecture Selection
      • Platform Configuration
      • Pack Import
      • Platform Build
      • Platform Module Configuration
      • Platform Customization
      • Platform Publication
      • BSP Connection
        • Principle
        • Options
        • Build Script File
        • Run Script File
    • Platform Qualification
      • Introduction
      • Platform Qualification Tools Overview
      • Platform Test Suite
      • Test Suite Versioning
        • Core Engine
        • UI Pack
        • FS Pack
        • BLUETOOTH Pack
        • NET Pack
    • MicroEJ Core Engine
      • Functional Description
      • Architecture
      • Capabilities
      • Implementation
        • Initialization
        • Scheduling
        • Idle Mode
        • Time
        • Error Codes
        • Example
        • Restart the Core Engine
        • Dump the States of the Core Engine
        • Check Internal Structure Integrity
      • Generic Output
      • Link
      • Dependencies
      • Installation
      • Abstraction Layer
      • Memory Considerations
      • Use
    • Advanced Event Tracing
      • Principle
      • Platforms using GNU LD linker
      • Platforms using IAR ILINK linker
    • Multi-Sandbox
      • Principle
      • Functional Description
      • Memory Considerations
      • Dependencies
      • Installation
      • Use
      • Feature Installation
        • Introduction
        • In-Place Installation
        • Custom Installation
        • Feature Persistency
        • Advanced Options
        • Determining the Amount of Required Memory
    • Tiny-Sandbox
      • Principle
      • Installation
      • Limitations
    • Native Interface Mechanisms
      • Simple Native Interface (SNI)
        • Principle
        • Functional Description
        • Example
        • Synchronization
        • Dependencies
        • Installation
        • Use
      • Shielded Plug (SP)
        • Principle
        • Functional Description
        • Shielded Plug Compiler
        • Example
        • Dependencies
        • Installation
        • Use
      • MicroEJ Java H
        • Principle
        • Functional Description
        • Dependencies
        • Installation
        • Use
    • External Resources Loader
      • Functional Description
      • Implementations
        • Open a Resource
        • Resource Identifier
        • Resource Offset
        • Resource Inside the CPU Address Space Range
      • External Resources Folder
      • Dependencies
      • Installation
      • Use
    • Serial Communications
      • ECOM
        • Principle
        • Functional Description
        • Device Management API
        • Dependencies
        • Installation
        • Use
      • ECOM Comm
        • Principle
        • Functional Description
        • Component Architecture
        • Comm Port Identifier
        • Dynamic Connections
        • Java API
        • Driver API
        • BSP File
        • XML File
        • ECOM Comm Mock
        • Dependencies
        • Installation
        • Use
    • Graphical User Interface
      • Principle
      • UI Port
        • UI Port Configuration
        • Simulation
        • BSP Port
        • GPU Port
      • MicroUI
        • Principle
        • Architecture
        • Thread
        • Native Calls
        • Transparency
        • Installation
        • Use
      • Static Initialization
        • Principle
        • Functional Description
        • XML File
        • XML File Example
        • Dependencies
        • Installation
        • Use
      • Abstraction Layer API
        • Principle
        • Embedded VEE Port
        • Simulator
      • LED
        • Principle
        • Functional Description
        • Abstraction Layer API
        • Typical Implementation
        • Dependencies
        • Installation
        • Use
      • Input
        • Principle
        • Functional Description
        • Driver Listener
        • Static Initialization
        • Standard Event Generators
        • Generic Event Generators
        • Abstraction Layer API
        • Typical Implementation
        • Event Buffer
        • Dependencies
        • Installation
        • Use
      • Display
        • Principle
        • Functional Description
        • Display Configurations
        • Buffer Modes
        • Partial Buffer
        • Byte Layout
        • Memory Layout
        • Pixel Structure
        • Abstraction Layer API
        • Typical Implementations
        • Display Synchronization
        • GPU Synchronization
        • Antialiasing
        • CLUT
        • Image Pixel Conversion
        • Library ej.api.Drawing
        • Dependencies
        • Installation
        • Use
      • Drawings
        • Abstraction Layer
        • Destination Format
        • Graphics Engine Software Algorithms
        • MicroUI C Module
        • Simulation
        • Custom Drawing
        • Drawing Logs
      • Images
        • Overview
        • Image Format
        • Image Generator
        • Image Loader
        • Image Renderer
        • Buffered Image
      • Fonts
        • Overview
        • Font Characteristics
        • Font Generator
        • Font Loader
        • Font Renderer
      • C Modules
        • Principle
        • UI Pack
        • C Module: MicroUI
        • C Module: MicroUI Over DMA2D
        • C Module: MicroUI Over VGLite
        • C Module: MicroUI Over NemaGFX
        • Compatibility
      • Simulation
        • Principle
        • Module Dependencies
        • MicroUI Implementation
        • Widget Display
        • Inputs Extensions
        • Heap Simulation
        • Image Decoders
        • Drawings
        • Image Rendering
        • Buffered Image
        • Classpath
        • Dependencies
        • Installation
        • Use
      • Release Notes
        • MicroEJ Architecture Compatibility Version
        • Foundation Libraries
        • Abstraction Layer Interface
        • Front Panel API
        • Image Generator API
        • C Modules
      • Changelog
        • [13.6.1] (2023-07-26)
        • [13.6.0] (2023-07-17)
        • [13.5.1] (2023-06-08)
        • [13.5.0] (2023-05-03)
        • [13.4.1] (2023-02-06)
        • [13.4.0] - 2022-12-13
        • [13.3.1] - 2022-09-09
        • [13.3.0] - 2022-09-02
        • [13.2.0] - 2022-05-05
        • [13.1.0] - 2021-08-03
        • [13.0.7] - 2021-07-30
        • [13.0.6] - 2021-03-29
        • [13.0.5] - 2021-03-08
        • [13.0.4] - 2021-01-15
        • [13.0.3] - 2020-12-03
        • [13.0.2] - 2020-10-02
        • [13.0.1] - 2020-09-22
        • [13.0.0] - 2020-07-30
        • [12.1.5] - 2020-10-02
        • [12.1.4] - 2020-03-10
        • [12.1.3] - 2020-02-24
        • [12.1.2] - 2019-12-09
        • [12.1.1] - 2019-10-29
        • [(maint) 8.0.0] - 2019-10-18
        • [12.1.0] - 2019-10-16
        • [12.0.2] - 2019-09-23
        • [12.0.1] - 2019-07-25
        • [12.0.0] - 2019-06-24
        • [11.2.0] - 2019-02-01
        • [11.1.2] - 2018-08-10
        • [11.1.1] - 2018-08-02
        • [11.1.0] - 2018-07-27
        • [11.0.1] - 2018-06-05
        • [10.0.2] - 2018-02-15
        • [11.0.0] - 2018-02-02
        • [10.0.1] - 2018-01-03
        • [10.0.0] - 2017-12-22
        • [9.4.1] - 2017-11-24
        • [9.4.0] - 2017-11-23
        • [9.3.1] - 2017-09-28
        • [9.3.0] - 2017-08-24
        • [9.2.1] - 2017-08-14
        • [9.2.0] - 2017-07-21
        • [9.0.2] - 2017-04-21
        • [9.1.2] - 2017-03-16
        • [9.0.1] - 2017-03-13
        • [9.1.1] - 2017-02-14
        • [9.1.0] - 2017-02-13
        • [9.0.0] - 2017-02-02
        • [8.1.0] - 2016-12-24
        • [8.0.0] - 2016-11-17
        • [7.4.7] - 2016-06-14
        • [7.4.2] - 2016-05-25
        • [7.4.1] - 2016-05-10
        • [7.4.0] - 2016-04-29
        • [7.3.0] - 2016-04-25
        • [7.2.1] - 2016-04-18
        • [7.2.0] - 2016-04-05
        • [7.1.0] - 2016-03-02
        • [7.0.0] - 2016-01-20
        • [6.0.1] - 2015-12-17
        • [6.0.0] - 2015-11-12
      • Migration Guide
        • From 13.5.x to 13.6.x
        • From 13.4.x to 13.5.x
        • From 13.3.x to 13.4.x
        • From 13.2.x to 13.3.x
        • From 13.1.x to 13.2.x
        • From 13.0.x to 13.1.x
        • From 12.x to 13.x
        • From 11.x to 12.x
        • From 10.x to 11.x
        • From 9.x to 10.x
        • From 8.x to 9.x
        • From 7.x to 8.x
    • Vector Graphics
      • Principle
      • MicroVG
        • Principle
        • Architecture
        • Native Calls
        • Installation
        • Use
      • Abstraction Layer API
        • Principle
        • Embedded VEE Port
        • Simulator
      • Matrix
        • Principle
        • Functional Description
        • Abstraction Layer API
        • Use
      • Path
        • Principle
        • Functional Description
        • Abstraction Layer API
        • Use
      • Gradient
        • Principle
        • Functional Description
        • Abstraction Layer API
        • Use
      • Image
        • Principle
        • Compile-time Image
        • Resource Vector Image
        • Buffered Vector Image
        • Runtime Image
        • Rendering Engine
        • Abstraction Layer API
        • Simulation
        • Use
      • Font
        • Principle
        • Functional Description
        • Abstraction Layer API
        • External Memory
        • Use
      • C Modules
        • Principle
        • UI Pack & MicroUI C Modules
        • Library: Vivante VGLite
        • VG Pack
        • C Module: MicroVG
        • Library: FreeType
        • Library: Harfbuzz
        • C Module: MicroVG Over VGLite
        • Compatibility
      • Simulation
        • Principle
        • Installation
        • Use
      • Release Notes
        • UI Pack Compatibility Version
        • Foundation Libraries
        • C Modules Compatibility Version
      • Changelog
        • [1.4.0] - 2023-07-21
        • [1.3.0] - 2023-05-10
        • [1.2.1] - 2023-02-06
        • [1.2.0] - 2022-12-30
        • [1.1.0] - 2022-09-05
        • [1.0.1] - 2022-05-16
        • [1.0.0] - 2022-05-13
      • Migration Guide
        • From 1.3.x to 1.4.x
        • From 1.2.x to 1.3.x
    • Networking
      • Principle
      • Network Core Engine
        • Principle
        • Functional Description
        • Dependencies
        • Installation
        • Use
      • SSL
        • Principle
        • Functional Description
        • Dependencies
        • Installation
        • Use
      • Network Interfaces Management
        • Overview
        • Dependencies
        • Installation
        • Use
      • Wi-Fi
        • Overview
        • Dependencies
        • Installation
        • Use
    • Bluetooth
      • Principle
      • Functional Description
      • Overview
      • Dependencies
      • Installation
      • Use
    • Event Queue
      • Principle
      • Dependencies
      • Installation
    • File System
      • Principle
      • Functional Description
      • Dependencies
      • Installation
        • Properties File Template
      • Use
    • Hardware Abstraction Layer
      • Principle
      • Functional Description
      • Identifier
        • Basic Rule
        • Generic Rules
      • Configuration
      • Dependencies
      • Installation
      • Use
    • Device Information
      • Principle
      • Dependencies
      • Installation
      • Use
    • Watchdog Timer
      • Overview
      • Principle
      • Mock Implementation
      • Dependencies
      • Installation
      • Use in an Application
      • Code example in Java
      • Use in C inside the BSP
      • Code example in C
    • SystemView
      • Principle
      • References
      • Installation
      • MicroEJ Core Engine OS Task
      • OS Tasks and Java Threads Names
      • OS Tasks and Java Threads Priorities
      • Use
      • Troubleshooting
        • SystemView doesn’t see any activity in MicroEJ Tasks
        • OVERFLOW Events in SystemView
        • RTT Control Block Not Found
      • RTT block found by SystemView but no traces displayed
      • Bus hardfault when running SystemView without Java Virtual Machine (JVM)
      • SystemView for STM32 ST-Link Probe
    • Simulation
      • Principle
      • Functional Description
      • Dependencies
      • Installation
      • Use
      • Mock
        • Principle
        • Functional Description
        • Example
        • Mocks Design Support
        • Dependencies
        • Installation
        • Use
        • JavaFX
      • Shielded Plug Mock
        • General Architecture
        • Configuration
      • Front Panel Mock
        • Principle
        • Functional Description
        • The Front Panel Project
        • Module Dependencies
        • Front Panel File
        • Widget
        • Installation
        • Use
      • Bluetooth LE Mock
        • Overview
        • Requirements
        • Usage
        • Troubleshooting
    • Appendices
      • Low Level API
        • LLMJVM: MicroEJ Core Engine
        • LLKERNEL: Multi-Sandbox
        • LLSP: Shielded Plug
        • LLEXT_RES: External Resources Loader
        • LLCOMM: Serial Communications
        • LLUI_INPUT: Input
        • LLUI_DISPLAY: Display
        • LLUI_LED: LEDs
        • LLVG: VectorGraphics
        • LLVG_MATRIX: Matrix
        • LLVG_PATH: Vector Path
        • LLVG_GRADIENT: Vector Linear Gradient
        • LLVG_FONT: Vector Font
        • LLNET: Network
        • LLNET_SSL: SSL
        • LLECOM_NETWORK: Network Interfaces
        • LLECOM_WIFI: Wi-Fi Management
        • LLBLUETOOTH: Bluetooth
        • LLEVENT: Event Queue
        • LLFS: File System
        • LLHAL: Hardware Abstraction Layer
        • LLDEVICE: Device Information
        • LLWATCHDOG_TIMER: Watchdog Timer
        • LLSEC: Security
      • MicroEJ Foundation Libraries
        • EDC
        • SNI
        • KF
        • ECOM
        • ECOM Comm
        • FS
        • Net
        • SSL
      • Tools Options and Error Codes
        • Immutable Files Related Error Messages
        • SNI
        • SP Compiler
        • NLS Immutables Creator
        • MicroUI Static Initializer
        • Front Panel
        • HIL Engine
        • Heap Dumping
      • Architectures MCU / Compiler
        • Principle
        • Supported MicroEJ Core Engine Capabilities by Architecture Matrix
        • ARM Cortex-M0
        • ARM Cortex-M4
        • ARM Cortex-M7
        • ARMv7A (ARMv7-A without integer division extension: Cortex-A5/Cortex-A8/Cortex-A9)
        • ARMv7VE (ARMv7-A with integer division extension: Cortex-A7/Cortex-A15)
        • ESP32
        • IAR Linker Specific Options
        • GNU LD Specific Options
        • ARM Linker Specific Options
      • Former Platform Migration
        • Create an Architecture Repository
        • Import the Former Platform Sources
        • Install the Platform Configuration Additions
        • Update the Front Panel Configuration
        • Configure the BSP Connection
        • Add the Build and Run Scripts
        • Use the Platform in Module Projects
        • Going further
      • Architecture 7.x Migration
        • Update Platform Configuration Additions
        • Update BSP with new Sections Names
        • Remove LLBSP_IMPL_isInReadOnlyMemory
        • Migrate Built-in Modules
        • Migrate Your LLKERNEL Implementation
        • Migrate Trace C Library Usage
        • Migrate Legacy System Properties Files
  • Kernel Developer Guide
    • Overview
      • Introduction
      • Terms and Definitions
      • Overall Architecture
      • Input and Output Artifacts
      • Kernel Build Flow
      • Kernel Implementation Libraries
    • Kernel & Features Specification
    • Getting Started
    • Kernel Creation
      • Create a new Project
      • Configure a VEE Port
      • Build the Executable and Virtual Device
      • Expose APIs
      • Add Pre-installed Applications
      • Build the Executable in the Workspace
      • Kernel Application Configuration
        • Module Configuration
        • Build Options
        • Build only a Virtual Device with a pre-existing Kernel
    • Kernel APIs
      • Kernel API Definition
      • Writing Kernel APIs
        • Default Kernel APIs Derivation
        • Kernel API Generator
    • Runtime Environment
      • Principle
      • Create a new Runtime Environment Module
        • Kernel APIs as Dependencies
        • Kernel APIs as Project File
        • Add Add-On Processors
      • Use a Runtime Environment in an Application
      • Extend a Runtime Environment
    • Kernel UID
    • Sandboxed Application Lifecycle
    • Communication between Features
      • Kernel Service Registry
      • Kernel Types Converter
    • Multi-Sandbox Enabled Libraries
      • Manage Internal Global State
        • Declare a Static Field Local to the Feature
        • Allow a Field Assignment in Kernel Mode
        • Use Existing Multi-Sandbox Enabled Data Structures
      • Implement a Security Manager Check
      • Known Foundation Libraries Behavior
        • MicroUI
        • BON
        • ECOM
        • ECOM-COMM
        • FS
        • NET
        • SSL
    • Setup a KF Test Suite
      • Enable the Test Suite
      • Add a KF Test
      • KF Test Suite Options
    • Kernel Linking
      • Link Flow
      • Kernel Metadata Generation
      • Feature Portability Control
        • Principle
        • Enable
        • Portability Rules
    • Application Linking
      • SOAR Build Phases
      • Feature Build Off Board
      • Feature Build On Device
        • General Workflow
        • Implement the Kernel
      • FSO Compatibility
      • Feature Portability
  • Tutorials
    • Understand How to Build a Firmware and its Dependencies
      • The Components
        • Architecture
        • Platform Sources
        • Application
        • C Toolchain (GCC, KEIL, IAR, …)
        • Module Repository
        • Dependencies Between Components
      • How to Build
        • Build a Platform
        • Build a Firmware
        • Dependencies Between Processes
    • Create a MicroEJ Platform for a Custom Device
      • Introduction
      • A MicroEJ Platform Project is already available for the same MCU/RTOS/C Compiler
        • Platform
        • BSP
        • Simulator
      • A MicroEJ Platform Project is not available for the same MCU/RTOS/C Compiler
        • MCU
        • RTOS
        • C Compiler
      • Platform Validation
      • Further Assistance Needed
    • Create a MicroEJ Firmware From Scratch
      • Intended Audience
      • Introduction
      • Prerequisites
      • Overview
      • Setup the Development Environment
      • Get Running BSP
      • FreeRTOS Hello World
      • Create a MicroEJ Platform
        • Import the MicroEJ Architecture
        • Install an Evaluation License
        • Create the MicroEJ Platform
        • Setup the MicroEJ Platform
      • Create MicroEJ Application HelloWorld
      • Configure BSP Connection in MicroEJ Application
      • MicroEJ and FreeRTOS Integration
        • Minimal Low Level APIs
        • Invoke MicroEJ Core Engine
        • Build and Link the Firmware with the MicroEJ Runtime and MicroEJ Application
    • Create MicroEJ Platform Build and Run Scripts
      • Intended Audience
      • Prerequisites
      • Introduction
      • Overview
      • Create Build and Run Scripts
        • Create build.sh and run.sh Scripts
        • Create build.bat and run.bat Scripts
      • Use Build Script in MicroEJ SDK
        • Build Firmware from MicroEJ SDK
        • Convert from partial BSP connection to full BSP connection (optional)
      • Going Further
    • Setup an Automated Build using Jenkins and Artifactory
      • Intended Audience
      • Introduction
      • Prerequisites
      • Overview
      • Install the Build Tools
      • Get a Module Repository
      • Setup Artifactory
        • Install and Start Artifactory
        • Configure Artifactory
        • Create Repositories
        • Import MicroEJ Repositories
      • Setup Jenkins
        • Install Jenkins
        • Configure Jenkins
        • Create a Job Template
      • Build a new Module using Jenkins
        • Create a new MicroEJ Module
        • Create a New Jenkins Job
        • Build the “Hello World” Application
      • Appendix
        • Customize Jenkins
        • Customize target~ path
    • Improve the Quality of Java Code
      • Intended Audience
      • Readable Code
        • Naming Convention
        • Visibility
        • Javadoc
        • Code Convention
        • Code Style and Formatting
      • Best Practices
        • Common Pitfalls
        • Simplify Maintenance
        • Basic Optimizations
        • Local Extraction
        • Equals and Hashcode
      • Related Tools
        • Unit Testing
        • Code Analysis with SonarQube™
    • Optimize the Memory Footprint of an Application
      • Intended Audience
      • Introduction
      • How to Analyze the Footprint of an Application
        • How to Analyze the Files Generated by the MicroEJ Linker
        • How to Analyze a Map File Generated by a Third-Party Linker
      • How to Reduce the Image Size of an Application
        • Application Resources
        • Application Code
        • MicroEJ Platform Configuration
        • Application Configuration
        • Stripping Class Names from an Application
      • How to Reduce the Runtime Size of an Application
        • Application Code
        • MicroEJ Platform Configuration
        • Application Configuration
    • Explore Data Serialization Formats
      • Intended Audience
      • XML
        • XML Module
        • Example Of Use
      • JSON
        • JSON Module
        • Example Of Use
      • CBOR
        • CBOR Module
        • Example Of Use
    • Instrument Java Code for Logging
      • Intended Audience
      • Introduction
      • Overview
      • Log with the Trace Library
      • Log with the Message Library
      • Log with the Logging Library
      • Remove Logging Related Code
        • Wrap with a Constant If Statement
        • Shrink Code Using ProGuard
    • Run a Test Suite on a Device
      • Intended Audience and Scope
      • Prerequisites
      • Introduction
      • Import the Test Suite
      • Configure the Test Suite
        • Select the Test Suite Version
        • Configure the Platform BSP Connection
        • Configure Execution Trace Redirection
        • Start Serial To Socket
        • Configure the Test Suite Specific Options
      • Run the Test Suite
      • Configure the Tests to Run
      • Examine the Test Suite Report
    • Implement a Blocking Java Native Method with SNI
      • Intended Audience
      • Prerequisites
      • Overview
      • Requirements
      • Example Code
        • Application Behavior
      • Implement a Non-Blocking Method
        • Update the C Native Function Implementation
        • Application Behavior
    • Get Started With GUI
      • Setup your Environment
        • Prerequisites
        • Download and Install
        • Start the IDE for the First Time
        • Prepare Platform Sources
        • Create a New Project
        • Featured Project: Widget Demo
      • Starting MicroUI
        • Widgets
        • Desktop Usage
        • Displaying a Label
      • Basic Drawing on Screen
        • Drawing Basic Shapes
        • Drawing Images
        • Drawing Thick Shapes
      • Animation
        • Usage
      • Creating Widgets
        • Setting Up
        • Using with Animator
      • Using Layouts
        • Using a Flow Layout
        • Using a Canvas
      • Style
        • Selectors
      • Images
        • Adding Images
        • Displaying an Image
      • Advanced Styling
        • Using Images in Stylesheet
        • Class Selector
        • Combinator and Conditional Style
      • Event Handling
        • The handleEvent Method
        • Using Events with Buttons
      • Fonts
        • Creating a font
        • Adding the Font to a Label
      • Scroll List
        • List
        • Scrollable List
      • Creating a Contact List using Scroll List
        • Creating the Contact Widget
      • Internationalization
        • Using PO Files
        • Configuring NLS in MicroEJ
        • Usage
        • Loading Translations as an External Resource
    • Discover Embedded Debugging Techniques
      • Intended Audience
      • Debugging Tools
        • Events Tracing and Logging
        • Runtime State Dump
        • Memory Inspection
        • Platform Qualification
        • Simulator Debugger
        • Static Analysis Tools
        • GUI Debugging Tools
      • Use Case 1: Debugging a GUI Application Freeze
        • Check RTOS Tasks Scheduling
        • Check Java Threads Scheduling
        • Check UI Thread Liveness
        • Check Input Events Processing
        • Implementation Details
      • Use Case 2: Debugging a HardFault
        • Useful Resources
        • Exceptions, HardFaults And Exception Handler
        • What To Do In Exception Handlers?
        • Memory Protection Unit (MPU)
        • Memory Corruption
        • Investigation
        • When a HardFault Occurs
        • Memory Dump Analysis
        • Trigger a VM Dump
    • How to Add Emojis to a Vector Font
      • Intended Audience
      • Prerequisites
      • Append the Emoji Glyphs
    • How to debug GUI performance issue
      • General good coding practices
        • Documents and tools to improve application code quality
        • Using recent versions of UI libraries
        • Memory management
      • Identifying the causes of bad performances
        • SystemView
        • MicroUI Flush Visualizer
      • High-level debugging and optimizations
        • Format of UI resources
        • Widget hierarchy and layout
        • Bad use of requestRender and requestLayout
        • Animations implementation
      • Hardware and low-level debugging and optimizations
        • At project level
        • At hardware level
        • Flush policy
  • Get Support
  • About MicroEJ
MicroEJ Documentation
  • HOME  /
  • Application Developer Guide  /
  • Graphical User Interface  /
  • Widgets and Examples

Widgets and Examples¶

  • Widget Library
    • Source
    • Provided Widgets
    • Color Utilities
    • Debug Utilities
  • Widget Demo
    • Source
    • Provided Widgets
  • MWT Examples
    • Source
    • Run the Examples
    • Provided Examples
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