用J2ME在移动设备上实现动画

private Image[] loadFrames( String name, int frames )

throws IOException {;

Image[] images = new Image[frames];

for( int i = 0; i < frames; ++i ){;

images = Image.createImage( name + i +

".png" );

};

return images;

};

import java.util.*;

import javax.microedition.lcdui.*;

// A canvas to which you can attach one or more

// animated images. When the canvas is painted,

// it cycles through the animated images and asks

// them to paint their current image.

public class AnimatedCanvas extends Canvas {;

private Display display;

private Image offscreen;

private Vector images = new Vector();

public AnimatedCanvas( Display display ){;

this.display = display;

// If the canvas is not double buffered by the

// system, do it ourselves...

if( !isDoubleBuffered() ){;

offscreen = Image.createImage( getWidth(),

getHeight() );

};

};

// Add an animated image to the list.

public void add( AnimatedImage image ){;

images.addElement( image );

};

// Paint the canvas by erasing the screen and then

// painting each animated image in turn. Double

// buffering is used to reduce flicker.

protected void paint( Graphics g ){;

Graphics saved = g;

if( offscreen != null ){;

g = offscreen.getGraphics();

};

g.setColor( 255, 255, 255 );

g.fillRect( 0, 0, getWidth(), getHeight() );

int n = images.size();

for( int i = 0; i < n; ++i ){;

AnimatedImage img = (AnimatedImage)

images.elementAt( i );

img.draw( g );

};

if( g != saved ){;

saved.drawImage( offscreen, 0, 0,

Graphics.LEFT | Graphics.TOP );

};

};

};