By Biswajit Sarkar
This e-book provides LWUIT via an optimal mixture of thought and perform. periods are defined and their functions are tested via a good number of examples. instance code is carefully analyzed and plenty of screenshots are integrated to teach what occurs whilst the code is finished. customized periods are equipped steadily with an intensive clarification of every step. The ebook additionally provides the underlying structural positive aspects of LWUIT which are vital for skillful use of the API. This booklet is for Java ME builders who are looking to create compelling consumer interfaces for Java ME functions, and wish to exploit LWUIT to make this take place.
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Extra resources for LWUIT 1.1 for Java ME Developers
If you find the file is missing, then you will have to load it manually. The JAR file can be found in the LWUIT_HOME directory. This has to be copied into the SWTK_HOME\lib\ext directory. The box on the right column (titled Bundle) has been left unchecked. This is alright as long as the application runs only on the emulator. To run it on a real phone, this box has to be checked. Other aspects of MIDlet deployment have been explained in the next section. jar selected, click on the OK button. This will take you to the screen confirming that the project has been created.
Let us suppose we have created our own widget—OurOwnWidget, and we want to paint it. We shall override the paint method to pass on the job of painting to the current LookAndFeel object. drawOurOwnWidget(g, this); } Obviously, the LookAndFeel object must implement the drawOurOwnWidget method. DefaultLookAndFeel, the concrete subclass of LookAndFeel that comes with LWUIT, contains methods for drawing all standard widgets. For example, it has the method drawButton for buttons, drawComboBox for combo boxes and so on.
Similarly, the parameter for the last three methods is the code for the key that was pressed. Methods for rendering Size and location data provide the basis for actual rendering of the components. There are a host of methods that perform various tasks related to drawing a component. A look at the list of these methods gives us our first idea about the intricacies involved in giving shape to a widget: • public void paint(Graphics g) • protected void paintBorder(Graphics g) • protected void paintBackground(Graphics g) • public void paintBackgrounds(Graphics g) • public void paintComponent(Graphics g) • public void paintComponent(Graphics g, boolean background) • protected void paintScrollbars(Graphics g) • protected void paintScrollbarX(Graphics g) • protected void paintScrollbarY(Graphics g) [ 43 ] This material is copyright and is licensed for the sole use by William Anderson on 26th August 2009 4310 E Conway Dr.