textexample.java

来自「Java ME手机应用开发大全一书的配套光盘上的源码」· Java 代码 · 共 63 行

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class TextExample extends MIDlet
{
  private Display  display;       
  private MyCanvas canvas;      
  public TextExample ()
  {
	//获取MIDlet的Display对象实例
    display = Display.getDisplay(this);
	//声明Canvas屏幕对象
    canvas  = new MyCanvas (this);
  }
  protected void startApp()
  {
    display.setCurrent(canvas);
  }
  protected void pauseApp()
  { 
  }
  protected void destroyApp( boolean unconditional )
  { 
  }
  public void exitMIDlet()
  {
    destroyApp(true);
    notifyDestroyed();
  }
}
class MyCanvas extends Canvas implements CommandListener
{
  private Command exit;  
  private TextExample textExample;
  public MyCanvas (TextExample textExample)
  {
    this. textExample = textExample;
    exit = new Command("Exit", Command.EXIT, 1);
    addCommand(exit);
    setCommandListener(this);
  } 
  protected void paint(Graphics graphics)
  {
	//设置画笔颜色为白色
    graphics.setColor(255,255,255);
	//填充屏幕
    graphics.fillRect(0, 0, getWidth(), getHeight());
	//设置画笔颜色为红色
    graphics.setColor(255,0,0);
	//设置字体格式
    graphics.setFont(Font.getFont(Font.FACE_PROPORTIONAL, 
                          Font.STYLE_BOLD, Font.SIZE_LARGE));
	//绘制字符串
    graphics.drawString("Hello World.", 50, 10, Graphics.HCENTER|Graphics.BASELINE);  
   }
  public void commandAction(Command command, Displayable displayable)
  {
    if (command == exit)
    {
      textExample.exitMIDlet();
    }
  }   
}