mycanvas.java

来自「J2ME 无线通信技术应用开发源代码」· Java 代码 · 共 31 行

// 程序名MyCanvas.java
// 一个简单的Canvas的子类
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class MyCanvas extends Canvas {
  private UI_Low4 midlet;
  String message ="Test";

  public MyCanvas( UI_Low4 midlet ){
    this.midlet = midlet;
  } 
 
  protected void showNotify() {
  }
  
  protected void hideNotify() {
  }

  protected void paint( Graphics g ){
    g.setColor(0xffffff);
    g.fillRect( 0, 0, getWidth(), getHeight());
    g.setColor(0x000000);
    g.drawString(message, getWidth()/2, 0,g.TOP | g.HCENTER );
  }

  protected void keyPressed( int keyCode ){
    message = "key "+getKeyName(keyCode)+" pressed.";
    repaint();
    System.out.println(message);
  }
}