将canvas创建高级菜单(2)

  // Get Width and Height of Canvas 
  width = getWidth(); 
  height = getHeight(); 
  setFullScreenMode(true); 
  menuIdx = 0; 
  g = getGraphics(); 
  leftOption = "Options"; 
  rightOption = "Exit"; 
  menu = new Menu(leftOption, rightOption, menuOptions); 
  start(); 
  midlet.display.setCurrent(this); 
 } 
 
 public void start() { 
  clearScreen(); 
  menu.drawInactiveMenu(this, g); 
 } 
 
 public void clearScreen() { 
  g.setColor(0xffffff); // white 
  g.fillRect(0, 0, width, height); 
  flushGraphics(); 
 } 
  
 protected void keyPressed(int keyCode) { 
  if (menuIsActive) { 
   if (keyCode == RIGHT_SOFTKEY_CODE) { 
    // draw inactive menu again 
    clearScreen(); 
    menu.drawInactiveMenu(this, g); 
    menuIsActive = false; 
   } 
   keyCode = getGameAction(keyCode); 
   if (keyCode == UP) { 
    currentlySelectedIndex--; 
    if (currentlySelectedIndex < 0) { 
     currentlySelectedIndex = 0; // stay within limits 
    } 
    menu.drawActiveMenu(this, g, currentlySelectedIndex); 
   } 
   else if (keyCode == DOWN) { 
    currentlySelectedIndex++; 
    if (currentlySelectedIndex >= menuOptions.length) { 
     currentlySelectedIndex = menuOptions.length - 1; 
    } 
    menu.drawActiveMenu(this, g, currentlySelectedIndex); 
   } 
   else if (keyCode == FIRE) { 
    clearScreen(); 
    g.setColor(0x000000); 
    g.drawString("[" + menuOptions[currentlySelectedIndex] 
      + "] was selected", 10, 15, g.LEFT | g.TOP); 
    menu.drawInactiveMenu(this, g); 
    menuIsActive = false; 
   } 
  } 
  else { 
   if (keyCode == LEFT_SOFTKEY_CODE) { // "Options" pressed 
    menu.drawActiveMenu(this, g, currentlySelectedIndex); 
    menuIsActive = true; 
   } 
   else if (keyCode == RIGHT_SOFTKEY_CODE) { 
     
   }