Slide Puzzle is a game for Nokia Asha software platform and Series 40 phones created with LWUIT library. Among other things, it demonstrates dragging, different layouts and painters, and also shows how to make custom LWUIT components.
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LWUIT Slide Puzzle

Slide Puzzle is a simple LWUIT-based puzzle game for Nokia Asha software platform and Series 40 phones. It demonstrates how LWUIT components can be used in a game context. Both non-touch and touch devices are supported, with drag gestures where available. It also gives an idea of how to use the device camera and helper threads for animating the interface.

This example application demonstrates:

  • LWUIT components in a game context
  • Layouts
  • Drag gestures on touch UI
  • Keyboard events
  • Embedding camera viewfinder
  • Animations
  • Fullscreen mode

The application is hosted in GitHub:

For more information on the implementation, visit the project's wiki:

  1. Usage

The game is a classical puzzle game where you have a 3x3 grid with 8 tiles. The goal of the player is to slide the tiles so that they are in the correct order. There are 3 puzzles with different pictures. When you start the game, you can continue from the state where you left the game last time. You can also take pictures with the camera in your phone and generate puzzles from them.

  1. Prerequisites

  • Java ME basics
  • LWUIT basics
  1. Important classes

  • PuzzleMidlet: The midlet class that initialises the display and starts the application.
  • GameView: The main game area and input handling.
  • PuzzleComponent: LWUIT component representing the Puzzle, handling game state persistence.
  • Puzzle: Logical controller component for the puzzle state, used by PuzzleComponent.
  • TileMover: Helper component for moving tiles around the puzzle.
  • CameraComponent: LWUIT component for controlling the camera.

3.1 Design considerations

At the top of the structure hierarchy there is PuzzleMidlet. It checks device characteristics and initialises the application but also takes care of operations needed when it is being closed.

PuzzleMidlet constructs a GameView (extends LWUIT Form) which functions as the main view in the game. In the middle of the view there is a container which holds the puzzle component and different menu components and shows them depending on the state. More details about the view is available online at

PuzzleComponent has a list of Puzzles instances of which one is active at a time. Puzzle holds the data and logic of puzzles. Every Puzzle has a two-dimensional array of Tile instances. When a Puzzle is set active, its image is loaded and split to tiles.

LWUIT mostly handles the painting but there is also a thread repainting them (for example, when the tiles are moved).

  1. Compatibility

Nokia Asha software platform 1.0 and all Series 40 phones with CLDC 1.1, MIDP 2.0, Mobile Media API (JSR-135), and camera. Max heap memory of the device needs to be at least 2 MB.

Tested on Nokia Asha 501, 311, 308, 305, 303 and Nokia X3-02.

Developed with Nokia Asha SDK 1.0 and Netbeans 7.1.

4.1 Required capabilities

CLDC 1.1, MIDP 2.0

4.2 Known issues

Asha 203 has an issue with rapidly moving between Next and Menu selections.

  1. Building, installing, and running the application

The example has been made with NetBeans 7.1 and Nokia SDK 2.0. The project can be easily opened in NetBeans by selecting 'Open Project' from the File menu and selecting the application.

Before opening the project, make sure the Nokia SDK 2.0 or newer is installed and added to NetBeans. Ensure that LWUIT for Series 40 library is added in the Libraries section. Building is done by selecting 'Build main project'.

Installing the application on a phone can be done by transferring the JAR file via Nokia Ovi Suite or via Bluetooth.

The application can also be run with Eclipse.

If you are playing with a device with touch screen, the tiles are moved by dragging them. On non-touch devices, the tiles are moved with navi-key or numbers 4, 8, 6, and 2. The menu and back buttons can be clicked with command keys on non-touch devices.

  1. License

See the license text file delivered with this project. The license file is also available online at

  1. Related documentation

Nokia SDK for Java:

  1. Version history

  • 1.1 Added camera feature, bug fixes. Published at
  • 1.0 First release (at Nokia Developer projects only).