J2ME를 사용하여 Blackberry에서 marque와 같은 스크롤 텍스트를 표시하려면 어떻게해야합니까?

Question

J2ME를 사용하여 Marquee 텍스트를 Blackberry에 표시하는 방법은 무엇입니까? 그것은 왼쪽에서 오른쪽 또는 수직으로 움직이는가? 도움이 될 것입니다.

Answer 1

정말 쉽게 표시 할 수 있습니다. 아래 코드를 확인하십시오.

import java.util.Timer; 
import java.util.TimerTask; 

import net.rim.device.api.ui.DrawStyle; 
import net.rim.device.api.ui.Field; 
import net.rim.device.api.ui.Font; 
import net.rim.device.api.ui.Graphics; 
import net.rim.device.api.ui.UiApplication; 
import net.rim.device.api.ui.component.LabelField; 
import net.rim.device.api.ui.container.MainScreen; 

public class MarqueeApp extends UiApplication { 

    public MarqueeApp() { 
    pushScreen(new MarqueeScreen()); 
    } 

    public static void main(String[] args) { 
     (new MarqueeApp()).enterEventDispatcher(); 
    } 
} 

class MarqueeScreen extends MainScreen { 
    public MarqueeScreen() { 
     setTitle(new LabelField("hi")); 
     MarqueeLabel testLabel1 = new MarqueeLabel("This is a marquee", 
       Field.FOCUSABLE); 
     add(testLabel1); 

     MarqueeLabel testLabel2 = new MarqueeLabel("This is a long long " + 
       "long long long long long long long long long long long " + 
       "long long marquee", Field.FOCUSABLE); 
     add(testLabel2); 
    } 
} 

class MarqueeLabel extends LabelField { 
    int currentChar = 0; 
    String currentText = null; 
    Font ourFont; 
    private Timer _scrollTimer; 
    private TimerTask _scrollTimerTask; 

    public MarqueeLabel(String text, long style) { 
     super(text, style);  
    } 

    public void paint(Graphics graphics) { 
     currentText = this.getText(); 
     if (currentChar < currentText.length()) { 
      currentText = currentText.substring(currentChar); 

     } 
     graphics.drawText(currentText, 0, 0, DrawStyle.ELLIPSIS, 200); 
     super.paint(graphics); 
    } 

    public void layout(int width, int height) { 
     ourFont = this.getFont(); 
     setExtent(500, ourFont.getHeight()); 
    } 

    protected void onDisplay() { 
     startScroll(); 
    } 

    protected void onUnfocus() { 
     startScroll(); 
    } 

    private void startScroll() { 
     // Start scrolling 
     final String fullText = this.getText(); 
     if (_scrollTimer == null) { 
      _scrollTimer = new Timer(); 
      _scrollTimerTask = new TimerTask() { 
       public void run() { 
        currentChar = currentChar + 4; 
        if (currentChar > fullText.length()) { 
         currentChar = 0; 
        } 
        invalidate(); 
       } 
      }; 
      _scrollTimer.scheduleAtFixedRate(_scrollTimerTask, 0, 300); 
     } 
    } 

    protected void onFocus(int direction) { 
     if (_scrollTimer != null) { 
      _scrollTimerTask.cancel(); 
      _scrollTimer.cancel(); 
      _scrollTimer = null; 
      _scrollTimerTask = null; 
     } 
    } 

    protected boolean navigationMovement(int dx, int dy, 
     int status, int time) { 
     currentText = this.getText(); 
     int oldCurrentChar = currentChar; 
     if (Math.abs(dx) > Math.abs(dy)) { 
      // horizontal scroll 
      if (dx > 0) { 
       currentChar = Math.min(currentText.length() - 1, 
         currentChar + 1); 
      } else if (dx < 0) { 
       currentChar = Math.max(0, currentChar - 1); 
      } 
      if (oldCurrentChar != currentChar) { 
       this.invalidate(); 
      } 
      return true; 
     } else { 
      return super.navigationMovement(dx, dy, status, time); 
     } 
    } 
}