midlet4.java

这是郭克华老师的J2ME视频的源代码

package prj12_1;

import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Font;
import javax.microedition.lcdui.Graphics;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

public class MIDlet4 extends MIDlet {
	private MyCanvas mc = new MyCanvas();
	private Display dis;
	protected void startApp() throws MIDletStateChangeException {
		dis = Display.getDisplay(this);
		mc.setTitle("MyCanvas");
		dis.setCurrent(mc);

	}
	protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
		// TODO Auto-generated method stub

	}

	protected void pauseApp() {
		// TODO Auto-generated method stub

	}

	
	class MyCanvas extends Canvas{
		public void paint(Graphics g){//参数g负责在画布上画图
			g.setColor(200, 100, 20);//各个分量在0-255之间
			g.drawString("中国人", 0, 0, Graphics.HCENTER|Graphics.TOP);
			Font font = Font.getFont(Font.FACE_SYSTEM,Font.STYLE_BOLD,Font.SIZE_LARGE);
			g.setFont(font);
			g.drawString("中国人", 100, 0, Graphics.HCENTER|Graphics.TOP);
			//得到字符串占据的宽度
			System.out.println(font.stringWidth("中国人"));
			//得到字符串占据的高度
			System.out.println(font.getHeight());
			int x = this.getWidth()/2;
			int y = this.getHeight()/2 - font.getHeight()/2;
			g.drawString("中国人", x, y, Graphics.HCENTER|Graphics.TOP);
		}
	}

}