在黑莓的上方位圖字段中加載gif圖像

Question

我在打開我的應用程序時在位圖字段中添加了啓動屏幕圖像。在線程方法中，我從httpconnection獲取徽標。

完成線程執行後，我刪除了位圖字段。並在該屏幕上加載徽標。

我想在執行線程時顯示在位圖字段上方加載gif圖像。

請幫忙。

嗨，我已經使用位圖字段在全屏顯示圖像。在上面的位圖字段中如何顯示加載gif圖像。那是我的問題。

Answer 1

轉到此鏈接：

http://www.blackberry.com/knowledgecenterpublic/livelink.exe/fetch/2000/348583/800332/800505/800345/How_To_-_Display_an_animated_GIF.html?nodeid=1405903&vernum=0

您將得到AnimatedGIFField.java文件。用專名保存它。寫這樣的....

GIFEncodedImage bitmapImage=(GIFEncodedImage)GIFEncodedImage.getEncodedImageResource("loading.gif"); 
AnimatedGIFField image_field=new AnimatedGIFField(bitmapImage); 
add(image_field); 

注：如果在> 6.0版本中使用這種 「loading.gif」 它給exceptoin。爲此，您必須將該文件重命名爲「loading.agif」。意味着你必須使用的7.0版本「loading.agif」不是「loading.gif」。重命名文件，並把在res文件夾和更改文件名：

GIFEncodedImage.getEncodedImageResource（「loading.agif」）

如果您有任何疑問都在計算器上的聊天室名稱「生活黑莓」澄清你和我們的疑惑。

Answer 2

使用下面的類到GIF文件加載到BitmapField， 要調用它，並顯示它使用下面的代碼：

GIFEncodedImage yourImage =(GIFEncodedImage)GIFEncodedImage.getEncodedImageResource("picture.gif"); 
AnimatedGIFField yourImageField =new AnimatedGIFField(yourImage); 
add(yourImageField); 

**

• 類別：

**

import net.rim.device.api.ui.UiApplication; 
import net.rim.device.api.system.GIFEncodedImage; 
import net.rim.device.api.ui.Graphics; 
import net.rim.device.api.ui.component.BitmapField; 
import net.rim.device.api.ui.Color; 
//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); 

     //Don't redraw the background if this is the first frame. 
     if (_currentFrame != 0) 
     { 
      //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() 
        { 
         _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; 
        } 
       } 
      } 
     } 
    } 
}