animationimagemidlet.java

来自「example2 众多JAVA实例源码...学习java基础的好帮手」· Java 代码 · 共 81 行

package opusmicro.demos.animate;
import java.io.*;
import java.util.*;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
// MIDlet that displays some simple animations.
// Displays a series of birds on the screen and
// animates them at different (random) rates.
public class AnimationImageMIDlet extends MIDlet implements CommandListener {;
private static final int BIRD_FRAMES = 7;
private static final int NUM_BIRDS = 5;
private Display display;
private Timer timer = new Timer();
private AnimatedImage[] birds;
private Random random = new Random();
public static final Command exitCommand = new Command( "Exit", Command.EXIT, 1 );

	public AnimationImageMIDlet(){
	}
	public void commandAction( Command c, Displayable d ){
		if( c == exitCommand ){
			exitMIDlet();
		}
	}
	protected void destroyApp( boolean unconditional )throws MIDletStateChangeException {
		exitMIDlet();
	}
	public void exitMIDlet(){
		timer.cancel(); // turn it off...
		notifyDestroyed();
	}
// Generate a non-negative random number...
	private int genRandom( int upper ){
		return( Math.abs( random.nextInt() ) % upper );
	}
	public Display getDisplay(){ return display; }
// Initialize things by creating the canvas and then
// creating a series of birds that are moved to
// random locations on the canvas and attached to
// a timer for scheduling.
	protected void initMIDlet(){
		try {
			AnimatedCanvas c = new AnimatedCanvas( getDisplay() );
			Image[] images = loadFrames( "/image", BIRD_FRAMES );
			int w = c.getWidth();
			int h = c.getHeight();
//			birds = new AnimatedImage[ NUM_BIRDS ];
			for( int i = 0; i < NUM_BIRDS; ++i ){
				AnimatedImage b = new AnimatedImage( c, images );
//				birds[i] = b;
				b.move( genRandom( w ), genRandom( h ) );
				c.add( b );
				timer.schedule( b, genRandom( 1000 ), genRandom( 400 ) );
			}
			c.addCommand( exitCommand );
			c.setCommandListener( this );
			getDisplay().setCurrent( c );
		}catch( IOException e ){
			System.out.println( "Could not load images" );
			exitMIDlet();
		}
	}
// Load the bird animation, which is stored as a
// series of PNG files in the MIDlet suite.
	private Image[] loadFrames( String name, int frames ) throws IOException {;
		Image[] images = new Image[frames];
		for( int i = 0; i < frames; ++i ){
			images[i] = Image.createImage( name + i + ".png" );
		}
		return images;
	}
	protected void pauseApp(){
	}
	protected void startApp() throws MIDletStateChangeException {
		if( display == null ){
			display = Display.getDisplay( this );
			initMIDlet();
		}
	}
}