selectcanvas.java

实现.多个.mid声音的播放,和图片的移动.可以手动控制图片的移动方向

import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Font;
import javax.microedition.lcdui.Graphics;

/**
 * @author XiaYaoxing Email: [e-mail]
 *
 */
public class SelectCanvas extends Canvas{

    public WorkMIDlet midlet;
    public int color;
    public int optionInd;
    public int optionPosX;	//选项位置	
    public int optionPosY;	
    public int width;
    public int height;
    
    
    /**当前选择项*/
    public int currentSelected;
    
    public SelectCanvas(WorkMIDlet midlet){
        setFullScreenMode(true);				//设置全屏显示
        width = getWidth();
        height = getHeight();
        this.midlet = midlet;
        color = 0xff0000;
    }
    protected void paint(Graphics g) {
        g.setColor(0xffffff);
        g.fillRect(0,0,width,height);
        drawOption(g); 
    }

    /**
     * 绘制选项
     */
    private void drawOption(Graphics g) {

        Font font = Pub.FONT_LARGE;
        g.setFont(font);
        int optionWidth = font.stringWidth("图片移动");
        int fontHeight = font.getHeight();
        int optionX = width - optionWidth >> 1;					//选项的X坐标
        String[] options = {"图片移动","声音播放"};
        int length = options.length;
        g.setColor(0);
        for(int i = 0;i < length;i ++){
            if(i == currentSelected){					//如果当前选项被选中,则显示红色
                g.setColor(0xff0000);
            }
            g.drawString(options[i],optionX,100 + (fontHeight + 5) * i,0);
            g.setColor(0);
        }
        g.drawString("退出",width - font.stringWidth("退出"),height - fontHeight,0);
    }
    
    /**按键处理*/
    public void keyPressed(int keyCode){
        switch(keyCode){
        	case Pub.KEY_UP:
        	case Pub.KEY_DOWN:
        	case KEY_NUM2:
        	case KEY_NUM8:
        	    currentSelected = currentSelected == 0 ? 1 : 0;
        	    repaint();
        	    serviceRepaints();
        	    break;
        	case Pub.SOFT_KEY_RIGHT:
        	    midlet.quitGame();			//退出游戏
        	    break;
        	case Pub.KEY_FIRE:
        	    WorkCanvas workCanvas = new WorkCanvas(midlet);
        		workCanvas.setFrame(currentSelected);
        		midlet.setCanvas(workCanvas);
        		break;
        }
    }

}