修改股票代碼

Question

我試圖修改下面的類，以便滾動文字出現在畫面左下角的「overlay.png」圖像後面。

我試圖改變

final int screenWidth = Display.getWidth(); 

到

final int screenWidth = 240 

但did'nt工作。

我該如何採取行動？

感謝

public class Ticker extends Field { 

     String text; 
    final int screenWidth = Display.getWidth(); 
    int offset = screenWidth; 
    Timer timer = new Timer(); 
    final int delay = 20; 
    private Bitmap backgroundImage; 

    public void setText(String text) { 
     this.text = text; 
    } 

    public String getText() { 
     return text; 
    } 

    public Ticker(String text) { 
     this.text = text; 
     backgroundImage = Constants.TICKER_BACKGROUND_IMAGE; 
     final int width = Font.getDefault().getAdvance(text); 
     TimerTask timerTask = new TimerTask() { 
      public void run() { 
       offset--; 
       if (offset + width == 0) { 
        offset = screenWidth; 
       } 
       invalidate(); 
      } 
     }; 
     timer.scheduleAtFixedRate(timerTask, delay, delay); 
    } 

    protected void layout(int width, int height) { 
     int w = Display.getWidth(); 
     int h = Font.getDefault().getHeight(); 
     setExtent(w, h); 

    } 

    protected void paint(Graphics graphics) { 


     graphics.drawBitmap(0, 0, backgroundImage.getWidth(), backgroundImage.getHeight(), backgroundImage, 0, 0); 
     Bitmap b = Bitmap.getBitmapResource("overlay.png"); 
     graphics.drawBitmap(0, 0, b.getWidth(), b.getHeight(), b, 0, 0); 

     graphics.setColor(Color.WHITE); 
     graphics.drawText(text, offset, 0); 
    } 


} 

Answer 1

嘗試修改你的paint方法是這樣的：

protected void paint(Graphics graphics) { 


    graphics.drawBitmap(0, 0, backgroundImage.getWidth(), backgroundImage.getHeight(), backgroundImage, 0, 0); 

    graphics.setColor(Color.WHITE); 
    graphics.drawText(text, offset, 0); 

    Bitmap b = Bitmap.getBitmapResource("overlay.png"); 
    graphics.drawBitmap(0, 0, b.getWidth(), b.getHeight(), b, 0, 0); 

}