基於Nokia手機的移動遊戲開發步步通（五）

5 高分屏幕

　　當用戶從主菜單中選擇"High scores"選項的時候，高分就會顯示出來。高分是顯示在全屏畫布（FullCanvas）實例上的。分數應該在一個屏幕上就顯示完，而不要捲動頁面，因爲這樣會給用戶帶來麻煩。
當然了，高分屏幕也可能會包含一些圖片或者動畫。用戶應該能夠通過按下左功能鍵、右功能鍵、數字鍵或者Send鍵返回主菜單。這個例子不提供任何處理高分的機制。處理高分的兩種典型的方法是通過使用記錄管理服務（RMS）永久保存分數或者通過HTTP連接把高分保存到服務器中。下面的代碼是高分的框架。

import javax.microedition.lcdui.*;
import com.nokia.mid.ui.*;
public class HighScore extends FullCanvas {
private GameMIDlet parent = null;
private MainMenu menu = null;
public HighScore(GameMIDlet parent, MainMenu menu) {
this.parent = parent;
this.menu = menu;
}
protected void paint(Graphics g) {
//Paint the high scores here
}
public void keyPressed(int keyCode) {
if (keyCode != KEY_END) {
//selection list to the screen
parent.setDisplayable(menu);
}
}
}

　　6 教學屏幕

　　當用戶從主菜單中選擇"Instructions"條目的時候，就會顯示出遊戲的規則。遊戲規則文本放置在Form實例中。Form中應該包含用於進入下一條教學規則的命令（例如，標籤"More"）和回到主菜單的命令（例如，標籤"Back"）。"More"一般由左功能鍵控制，而"Back"由右功能鍵控制。如果教學規則裏包含動畫，那麼這些動畫應該使用全屏畫布（FullCanvas）來顯示。按下左功能鍵將跳過動畫進入下一個教學屏幕。按下右功能鍵，用戶將從動畫中回到主菜單。鍵End將結束應用程序。下面的代碼是文字教學規則和動畫的框架。

//Text instructions. Text can be written in constructor or in own
method.
//Developer should remember that also instruction texts should be
//internationalized
import javax.microedition.lcdui.*;
public class Instructions extends Form implements CommandListener {
//Command for going next instruction if needed
private Command more = new Command(
Resources.getString(Resources.ID_GAME_MORE),
Command.OK, 1);
//Command for going back to the main menu
private Command back = new Command("", Command.BACK, 2);
private GameMIDlet parent = null;
private MainMenu menu = null;
public Instructions(String title, GameMIDlet parent, MainMenu
menu) {
super(title);
this.parent = parent;
this.menu = menu;
this.addCommand(back);
this.addCommand(more);
this.setCommandListener(this);
}
public void commandAction(Command p0, Displayable p1) {
if (p0 == more) {
//go to the next if needed e.g animation
parent.setDisplayable(new InstructionAnimation(parent));
}
else if (p0 == back) {
parent.setDisplayable(menu);
}
}
}
//Instruction animation
import javax.microedition.lcdui.*;
import com.nokia.mid.ui.*;
public class InstructionAnimation extends FullCanvas {
private GameMIDlet parent = null;
public InstructionAnimation(GameMIDlet parent) {
this.parent = parent;
}
protected void paint(Graphics g) {
//Do the animation here
}
public void keyPressed(int keyCode) {
if (keyCode == KEY_SOFTKEY1) {
//go to the next instruction screen if needed
}
else if (keyCode == KEY_SOFTKEY2) {
//selection list to the screen
parent.setDisplayable(new MainMenu(
Resources.getString (
Resources.ID_GAME_NAME),
List.IMPLICIT, parent));
}
}
}

　　7關於（About）屏幕

　　關於（About）屏幕顯示遊戲製作公司的消息文本或標誌。當用戶從主菜單中選擇"About"選項的時候，就會啓動這個屏幕。和教學規則頁面一樣，關於屏幕頁面如果只需要文本信息的話，那麼可以使用Form來實現。如果需要圖像或動畫，那麼應該使用Canvas或FullCanvas。

//Text "About" code skeleton
import javax.microedition.lcdui.*;
public class About extends Form implements CommandListener {
//Command for going back to the main menu
private Command back = new Command("", Command.BACK, 1);
private GameMIDlet parent = null;
private MainMenu menu = null;
public About(String title, GameMIDlet parent, MainMenu menu) {
super(title);
this.parent = parent;
this.menu = menu;
this.addCommand(back);
this.setCommandListener(this);
}
public void commandAction(Command p0, Displayable p1) {
if (p0 == back) {
parent.setDisplayable(menu);
}
}
}

　　8 退出

　　從主菜單中選擇"Exit game"選項來中止遊戲並釋放所有的資源。

　　9 Resources類

　　Resources類不是一個用戶界面類，與本文中介紹的其他類不同。這個類處理國際化問題。

/**
* A simple class to simulate a resource bundle.
* Modify the contents of this class according to the
* locales/languages you want your application to support.
* In your application, retrieve a string using code such as the
* following:
* <pre>
* <code>String s = Resources.getString(Resources.ID_GAME_NEW);
* </code></pre>
* Copyright (C) 2002 Nokia Corporation
*/
public class Resources {
// Identifiers for text strings.
public static final int ID_GAME_NEW = 0;
public static final int ID_GAME_OPTIONS = 1;
public static final int ID_GAME_HIGHSCORES = 2;
public static final int ID_GAME_INSTRUCTIONS = 3;
public static final int ID_GAME_ABOUT = 4;
public static final int ID_GAME_CONTINUE = 5;
public static final int ID_GAME_BACK = 6;
public static final int ID_GAME_MORE = 7;
public static final int ID_GAME_EXIT = 8;
public static final int ID_GAME_LEVEL = 9;
public static final int ID_GAME_SOUNDS = 10;
public static final int ID_GAME_VIBRA = 11;
public static final int ID_GAME_NAME = 12;
// List of supported locales.
// The strings are Nokia-specific values
// of the "microedition.locale" system property.
private static final String[] supportedLocales = {
"en", "fi-FI", "fr", "de"
};
//NOTE: default language must be the first one
//for getString to work!
// Strings for each locale, indexed according to the
// contents of supportedLocales
private static final String[][] strings = {
{ "New game", "Settings", "High scores", "Instructions",
"About","Continue", "Back", "More", "Exit game",
"Level", "Sounds","Shakes", "Game name" },
{ "Uusi peli", "Asetukset", "Huipputulokset", "Peliohjeet",
"Tietoja","Jatka", "Poistu", "Jatka", "Poistu",
"Vaikeusaste", "Peli??net", "V?rin?tehosteet",
"Pelin nimi" },
{ "Nouveau jeu", "Paramètres", "Scores", "Instructions",
"A propos","Continuer", "Retour", "Suite", "Sortir",
"Niveau", "Sons", "Vibrations", "Jeu nom" },
{ "Neues Spiel", "Einstellungen", "Rekord", "Anleitung",
"über","Weiter", "Zurück", "Weiter", "Beenden",
"Ebene", "Ton", "Vibrationen", "Spiel name" }
};
/**
* Gets a string for the given key.
* @param key Integer key for string
* @return The string
*/
public static String getString(int key) {
String locale = System.getProperty("microedition.locale");
if (locale == null) {
locale = new String(""); // use empty instead of null
}
// find the index of the locale id
int localeIndex = -1;
for (int i = 0; i < supportedLocales.length; i++) {
if (locale.equals(supportedLocales[i])) {
localeIndex = i;
break;
}
}
// not found
if (localeIndex == -1) {
// defaults to first language, in this example English
return strings[0][key];
}
return strings[localeIndex][key];
}
}

作者：wayne編譯    轉貼自：yesky.com    

作者Blog：http://blog.csdn.net/mobilechannel/