class HelloCanvas extends Canvas { // Put all drawing here, in the paint() method in Java

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class HelloCanvas extends Canvas { // Put all drawing here, in the paint() method
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public void processEvent(int type, int param) { if(type == DisplayKEY_PRESSED_EVENT) { int key = getKeypadState(); if (param == DisplayKEY_RIGHT) // The right cursor key was pressed else if(param == DisplayKEY_SOFT1) // Softkey 1 was pressed else if(param == DisplayKEY_SOFT2) // Softkey 2 was pressed else if } } }
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KeyListener on a Panel
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Panels, meanwhile, can implement various listeners For instance, to detect key presses simply have your panel implement KeyListener You can then set the panel as the listener within the constructor:
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setKeyListener(this);
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The panel must then handle two methods:
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keyPressed(Panel panel,int key) keyReleased(Panel panel,int key)
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This enables the panel to detect any keypress, similar to the processEvent() method of
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Component Listener Additionally, a panel can implement ComponentListener This lets the panel deal with any changes to any of its components For example, to deal with a button
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public class ButtonTest extends Panel implements ComponentListener { Button btn; ButtonTest() { btn = new Button("Button"); thisadd(btn); setComponentListener(this); public void componentAction(Component source, int type, int param) { if (source instanceof Button && type == BUTTON_PRESSED) // Do something! } }
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Your panel or Canvas can also implement the SoftKeyListener class to deal directly with the two soft keys Simply add a listener to your panel or Canvas's constructor method:
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setSoftKeyListener(this);
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Then set the label you want to appear on the phone's menu This label is usually placed directly above the soft key:
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setSoftLabel(FrameSOFT_KEY_1, "Exit");
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You can now implement SoftKeyListener using the softKeyPressed() and softKeyReleased() methods For example
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public void softKeyPressed(int key) { if (key == FrameSOFT_KEY_1) MainAppterminate(); } public void softKeyReleased(int key) {}
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Graphics and Sound iAppli can handle the following formats:
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Still images GIF 87 and 87a Unlike MIDP, iApplis support transparent images This is good news for game programmers! Animations GIF89a animated GIF sequences Sounds i-Melody file (MLD) format This is a format similar to MIDI, allowing up to 16 different voices Most MLD files are less than 1KB in size You can create i-Melody files using various tools One popular tool is MLD Creator by Naka-Net (http://wwwnaka-netcom/SOFT/MLDC/)
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Images and sounds can be loaded using the comnttdocomouiMediaManager's methods:
MediaData getData(String location) MediaImage getImage(String location) MediaSound getSound(String location)
There are two main locations you can read media from:
You can place images or sounds within the JAR that the iAppli Java classes are packaged in In this case, you use the resource protocol:
MediaImage mi = MediaManagergetImage ("resource: ///samplegif");
You can grab a media file directly from a Web server using the HTTP or HTTPS protocol:
MediaImage mi = MediaManagergetImage ("http: //wwwsamplecom/images/samplegif");
MediaImage mi = MediaManagergetImage( getSourceURL() + "samplegif" );
Displaying an Image To display an image you could use code similar to the following:
MediaImage mi = MediaManagergetImage("resource:///samplegif"); try{ miuse(); } catch(ConnectionException ce){ // Could not connect } catch(UIException ui){ // Other exception } Image img = migetImage();
You can now paint using a VisualPresenter component When you are temporarily done with the image, you can call unuse() to free up the memory If you no longer need the image at all, you can call dispose() to unload the image entirely Playing Music To play an audio file, use an AudioPresenter The code is similar to the following:
AudioPresenter ap; MediaSound ms; ap = AudioPresentergetAudioPresenter(); ms = MediaManagergetSound("resouce:///audio/testmld"); try { msuse(); } catch (Exception e) { } apsetSound(ms);
You can then play the sound at any time by calling
applay();
When finished, call the stop() method on your audio presenter and call unuse() and dispose() on your media sound object to dispose of the sound properly Listening to Your Music You can also keep track of an audio clip by having your panel implement MediaListener You can then set the listener as follows:
apsetMediaListener(this);
Finally, you must implement the mediaAction method as follows:
public void mediaAction(MediaPresenter source, int type, int param) {
switch (type) { case AudioPresenterAUDIO_PLAYING: break; case AudioPresenterAUDIO_COMPLETE: break; case AudioPresenterAUDIO_STOPPED: break; }