Blackberry 上显示动态 GIF 图片

主类是在外国网站上看的，忘了是哪个网站了。直接上主类的代码

package com.doll.decodegif;

import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.ui.XYRect;
import net.rim.device.api.system.GIFEncodedImage;
import net.rim.device.api.ui.Graphics;
import net.rim.device.api.ui.component.BitmapField;

//A field that displays an animated GIF.

public class AnimatedGIFField extends BitmapField 
{
    private GIFEncodedImage _image;     //The image to draw.
    private int _currentFrame;          //The current frame in the animation sequence.
    private int _width;                 //The width of the image (background frame).
    private int _height;                //The height of the image (background frame).
    private AnimatorThread _animatorThread;
    
    public AnimatedGIFField(GIFEncodedImage image)
    {
        this(image, 0);
    }
    
    public AnimatedGIFField(GIFEncodedImage image, long style)
    {
        //Call super to setup the field with the specified style.
        //The image is passed in as well for the field to configure its required size.
        super(image.getBitmap(), style);
        
        //Store the image and it's dimensions.
        _image = image;
        _width = image.getWidth();
        _height = image.getHeight();
        
        //Start the animation thread.
        _animatorThread = new AnimatorThread(this);
        _animatorThread.start();
    }
    
    protected void paint(Graphics graphics)
    {
        //Call super.paint.  This will draw the first background frame and handle any required focus drawing.
        super.paint(graphics);
        graphics.clear(this.getExtent());
        //Don't redraw the background if this is the first frame.
        if (true)
        {
            //Draw the animation frame.
            graphics.drawImage(_image.getFrameLeft(_currentFrame), _image.getFrameTop(_currentFrame), 
                _image.getFrameWidth(_currentFrame), _image.getFrameHeight(_currentFrame), _image, _currentFrame, 0, 0);
        }
    }
    
    //Stop the animation thread when the screen the field is on is
    //popped off of the display stack.
    protected void onUndisplay()
    {
        _animatorThread.stop();
        super.onUndisplay();
    }
    
   
    //A thread to handle the animation.
    private class AnimatorThread extends Thread
    {
        private AnimatedGIFField _theField;
        private boolean _keepGoing = true;      
        private int _totalFrames;               //The total number of frames in the image.
        private int _loopCount;                 //The number of times the animation has looped (completed).
        private int _totalLoops;                //The number of times the animation should loop (set in the image).

        public AnimatorThread(AnimatedGIFField theField)
        {
            _theField = theField;
            _totalFrames = _image.getFrameCount();
            _totalLoops = _image.getIterations();
            
        }
        
        public synchronized void stop()
        {
            _keepGoing = false;
        }
        
        public void run()
        {
        	
            while(_keepGoing)
            {
                //Invalidate the field so that it is redrawn.
                UiApplication.getUiApplication().invokeAndWait(new Runnable() 
                {
                    public void run() 
                    {
                    	//UiApplication.getUiApplication().getActiveScreen().invalidate();
                        _theField.invalidate();     
                      
                    }
                });                
                
                try
                {
                    //Sleep for the current frame delay before the next frame is drawn.
                    sleep(_image.getFrameDelay(_currentFrame) * 10);
                }
                catch (InterruptedException iex)
                {} //Couldn't sleep.
                
                //Increment the frame.
                ++_currentFrame;      
                
                if (_currentFrame == _totalFrames)
                {
                    //Reset back to frame 0 if we have reached the end.
                    _currentFrame = 0;
                    
                    ++_loopCount;
                    
                    //Check if the animation should continue.
                    if (_loopCount == _totalLoops)
                    {
                        _keepGoing = false;
                    }
                }
            }
        }
    }
}

附件里面是解析GIF图片的一个Demo工程 （这是在Eclipse上的 在BB自己的IDE里面我也测试过了）