displayable1.java~1~

来自「手机上画线」· JAVA~1~ 代码 · 共 52 行

import javax.microedition.lcdui.*;

public class Displayable1 extends Canvas implements CommandListener {
  /** Constructor */
  public Displayable1() {
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }

  /**Component initialization*/
  private void jbInit() throws Exception {
    // Set up this Displayable to listen to command events
    setCommandListener(this);
    // add the Exit command
    addCommand(new Command("Exit", Command.EXIT, 1));
  }

  /**Handle command events*/
  public void commandAction(Command command, Displayable displayable) {
    /** @todo Add command handling code */
    if (command.getCommandType() == Command.EXIT) {
// stop the MIDlet
      MIDlet1.quitApp();
    }
  }

  /** Required paint implementation */
  protected void paint(Graphics g) {
    int width = getWidth();
    int height = getHeight();
// Fill the background using black
    g.setColor(0);
    g.fillRect(0, 0, width, height);
// White horizontal line
    g.setColor(0xFFFFFF);
    g.drawLine(0, height / 2, width - 1, height / 2);
// Yellow dotted horizontal line
    g.setStrokeStyle(Graphics.DOTTED);
    g.setColor(0xFFFF00);
    g.drawLine(0, height / 4, width - 1, height / 4);
// Solid diagonal line in brightest gray
    g.setGrayScale(255);
    g.setStrokeStyle(Graphics.SOLID);
    g.drawLine(0, 0, width - 1, height - 1);
  }
}