读 Beginning Android Games 2nd Edition (十五) 游戏主菜单-优快云博客

本博客详细解析了游戏主菜单中的交互逻辑及音效处理机制，通过代码实现，确保用户在点击不同选项时能触发相应的事件，并在静音设置下优化音效播放体验。

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如上图,主菜单的选项有各自的坐标数,点击在固定的范围内才能触发相应事件

package com.badlogic.androidgames.mrnom;

import java.util.List;

import com.badlogic.androidgames.framework.Game;
import com.badlogic.androidgames.framework.Graphics;
import com.badlogic.androidgames.framework.Input.TouchEvent;
import com.badlogic.androidgames.framework.Screen;

public class MainMenuScreen extends Screen {
    public MainMenuScreen(Game game) {
        super(game);               
    }   

    public void update(float deltaTime) {
        Graphics g = game.getGraphics();
        List<TouchEvent> touchEvents = game.getInput().getTouchEvents();
        game.getInput().getKeyEvents();       
        
        int len = touchEvents.size();
        for(int i = 0; i < len; i++) {
            TouchEvent event = touchEvents.get(i);
            if(event.type == TouchEvent.TOUCH_UP) {
                if(inBounds(event, 0, g.getHeight() - 64, 64, 64)) {
                    Settings.soundEnabled = !Settings.soundEnabled;
                    if(Settings.soundEnabled)
                        Assets.click.play(1);
                }
                if(inBounds(event, 64, 220, 192, 42) ) {
                    game.setScreen(new GameScreen(game));
                    if(Settings.soundEnabled)
                        Assets.click.play(1);
                    return;
                }
                if(inBounds(event, 64, 220 + 42, 192, 42) ) {
                    game.setScreen(new HighscoreScreen(game));
                    if(Settings.soundEnabled)
                        Assets.click.play(1);
                    return;
                }
                if(inBounds(event, 64, 220 + 84, 192, 42) ) {
                    game.setScreen(new HelpScreen(game));
                    if(Settings.soundEnabled)
                        Assets.click.play(1);
                    return;
                }
            }
        }
    }
    
    private boolean inBounds(TouchEvent event, int x, int y, int width, int height) {
        if(event.x > x && event.x < x + width - 1 && 
           event.y > y && event.y < y + height - 1) 
            return true;
        else
            return false;
    }

    public void present(float deltaTime) {
        Graphics g = game.getGraphics();
        
        g.drawPixmap(Assets.background, 0, 0);
        g.drawPixmap(Assets.logo, 32, 20);
        g.drawPixmap(Assets.mainMenu, 64, 220);
        if(Settings.soundEnabled)
            g.drawPixmap(Assets.buttons, 0, 416, 0, 0, 64, 64);
        else
            g.drawPixmap(Assets.buttons, 0, 416, 64, 0, 64, 64);
    }

    public void pause() {        
        Settings.save(game.getFileIO());
    }

    public void resume() {

    }

    public void dispose() {

    }
}

present 方法是在界面中画出背景图,游戏logo,游戏主菜单选项(实际上是一整张图片,不同选项),选择静音的按钮

inBounds方法限定触摸屏幕时,事件触发的区域

                    if(Settings.soundEnabled)
                        Assets.click.play(1);

上面的代码就是点击菜单以后,如果没有静音,那么播放点击时的音效

总的来说,还是很好理解的