sscanvas.java

j2me做的国旗播放 就是一个小小的幻灯片 然后有代码自己画的图 也有图片

import javax.microedition.lcdui.*;
import java.io.*;
public class SSCanvas extends Canvas {
  private int curSlide = 5;
     

public void keyPressed(int keyCode) {
    // 将物理按键代码转换为逻辑游戏按键代码
    int action = getGameAction(keyCode);
    switch (action) {
      case FIRE://确认健
        if (--curSlide < 0)
          curSlide = 4;
        repaint();//重新绘制整个Canvas
        break;
      }
  }

  public void paint(Graphics g) {
    // 填充背景
    int w = this.getWidth();
    int h = this.getHeight();

    g.setColor(0, 0, 0);  // 黑
    g.fillRect(0, 0, w, h);
    switch (curSlide) {
    case 0:
    g.setColor(255, 255, 255);    
    g.fillRect(0, 50, w, h-90);
    g.setColor(255, 0, 0); 
    g.fillArc(w/2-55, h/2-55, w/2-10, w/2-10, 0, 360);
    g.setColor(255, 255, 255);
    String s = "日本国旗";//字符串赋值
	Font f = Font.getFont(Font.FACE_MONOSPACE, 
		                  Font.STYLE_PLAIN, 
		                  Font.SIZE_LARGE);
    g.setFont(f);//设置字体
    int stringWidth = f.stringWidth(s);//字符串宽度
    int stringHeight = f.getHeight();//字符串高度
    
   // 字符串位置
	
	int i = (w - stringWidth)/2;
	int j = 10;	
	g.drawString(s, i, j, Graphics.TOP|Graphics.LEFT);
		
    break;
    case 1:g.setColor(0, 0, 0);  
    g.fillRect(0, 0, w, h);

    g.setColor(255, 255, 255);    
    g.fillRect(0, 50, w, h-90);

    g.setColor(0, 140, 239);    
    g.fillRect(0, 70, w, h-260);
    g.fillRect(0, 200, w, h-260);
    g.fillTriangle(w/2-50,130,w/2+50,130,w/2,190);
    g.fillTriangle(w/2,110,w/2-50,170,w/2+50,170);
    
    String z = "以色列国旗";//字符串赋值
	Font l = Font.getFont(Font.FACE_MONOSPACE, 
		                  Font.STYLE_PLAIN, 
		                  Font.SIZE_LARGE);
    g.setFont(l);//设置字体
	int stw = l.stringWidth(z);//字符串宽度
	int sth = l.getHeight();//字符串高度
    // 字符串位置
	
	int x = (w - stw)/2;
	int y = 10;	
	g.drawString(z, x, y, Graphics.TOP|Graphics.LEFT);
   break;

    case 2:    g.setColor(0, 0, 0);  
    g.fillRect(0, 0, w, h);

    g.setColor(255, 0, 0);    
    g.fillRect(0, 50, w, h-90);
    g.setColor(255, 255, 255);    
    g.fillRect(w/2-80, h/2-20, w/2+40, h/2-100);
    g.fillRect(w/2-20, h/2-70, w/2-80, h/2+20);break;
    case 3:

Image img;
try{// 加载幻灯片图片
img=Image.createImage("/images/wnrl.jpg");
}catch(java.io.IOException e){
System.out.println("can not find wnrl.jpg");
img=null;
}
g.drawImage(img, getWidth() / 2, getHeight() /  
2,
                Graphics.HCENTER | Graphics.VCENTER);
break;
case 4:
Image img1;
try{// 加载幻灯片图片
img1=Image.createImage("/images/mei.jpg");
}catch(java.io.IOException e){
System.out.println("can not find mei.jpg");
img1=null;
}
g.drawImage(img1, getWidth() / 2, getHeight() /  
2,
                Graphics.HCENTER | Graphics.VCENTER);
break;
case 5:
g.setColor(255, 255, 255);  
    g.fillRect(0, 0, w, h);
g.setColor(0, 0, 0);
String k = "欢迎来到国旗观赏";//字符串赋值
String m = "请按select键看下一张图";
Font p = Font.getFont(Font.FACE_MONOSPACE, 
		                  Font.STYLE_PLAIN, 
		                  Font.SIZE_LARGE);
    g.setFont(p);//设置字体
    int sW= p.stringWidth(k);//字符串宽度
    int sH = p.getHeight();//字符串高度
g.drawString(k, 50, sH/2, Graphics.TOP|Graphics.LEFT);
g.drawString(m, 30, sH/2+20, Graphics.TOP|Graphics.LEFT);
}

}
}