Libgdx 音乐未正确处理

Posted 2023-02-26

【中文标题】Libgdx 音乐未正确处理

【英文标题】：Libgdx music not disposing properly

【发布时间】：2017-06-15 00:15:07

【问题描述】：

我有这个 libgdx 横向滚动游戏，音乐文件 (mp3) 一直在自己播放，而不是被处理和播放一次。听起来多个音乐文件同时播放，游戏变慢了崩溃。

游戏从MenuState(菜单)>>PlayState(实际游戏区域)>>GameOverState(游戏结束类)>>PlayState>>GameOverState等...

playstate 中的音乐继续播放而游戏崩溃。

这是我的 PlayState

package com.mygdx.game.States;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.audio.Music;
import com.badlogic.gdx.graphics.Color;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.BitmapFont;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.graphics.g2d.freetype.FreeTypeFontGenerator;
import com.badlogic.gdx.math.Vector2;
import com.badlogic.gdx.utils.Array;
import com.badlogic.gdx.utils.TimeUtils;
import com.mygdx.game.GrumpyDemo;
import com.mygdx.game.Sprites.Bird;
import com.mygdx.game.Sprites.Tube;

/**
 * Created by Kronos on 28-01-2017.
 */

public class PlayState extends State 
private static final int TUBE_SPACING = 75;
private static final int TUBE_COUNT = 4;

private Bird bird;
private Texture actualGamebg;
private Tube tube ;
private Texture ground;
private Vector2 groundPos1,groundPos2;
private static final int HIGHEST_GROUND_LIMIT = -30;
private Array<Tube> tubes;
private int k;
long startTime=0;
private Music mainMusic;
private Music scoreIncrease;
private Music wingFlap;
public BitmapFont font24;
public String SCORE;
public int l;

public PlayState(GameStateManager gsm) 
    super(gsm);
    bird = new Bird(0,300);
    actualGamebg = new Texture("bg.png");
    cam.setToOrtho(false, GrumpyDemo.WIDTH/2,GrumpyDemo.HEIGHT/2);

    tubes =new Array<Tube>();
    ground = new Texture("ground.png");
    mainMusic = Gdx.audio.newMusic(Gdx.files.internal("mainmusic.mp3"));
    scoreIncrease = Gdx.audio.newMusic(Gdx.files.internal("smw_coin.ogg"));
    wingFlap = Gdx.audio.newMusic(Gdx.files.internal("sfx_wing.ogg"));

    font24= new BitmapFont();
    SCORE = new String();
    fontGenerator();
    groundPos1 = new Vector2(cam.position.x -cam.viewportWidth/2, HIGHEST_GROUND_LIMIT);
    groundPos2 = new Vector2((cam.position.x - cam.viewportWidth/2) + ground.getWidth(),HIGHEST_GROUND_LIMIT);
    startTime = TimeUtils.nanoTime();

    for(int i=1 ; i<=TUBE_COUNT; i++)
        tubes.add(new Tube(i* (TUBE_SPACING + Tube.TUBE_WIDTH)));
    
    mainMusic.play();
    mainMusic.setVolume(0.8f);
    mainMusic.setLooping(true);


@Override
protected void handleInput() 
    if (Gdx.input.justTouched())
        bird.jump();
    wingFlap.setLooping(false);
    wingFlap.play();
    wingFlap.setVolume(0.1f);


@Override
public void update(float dt) 
    handleInput();
    updateGround();
    bird.update(dt);
    if (TimeUtils.timeSinceNanos(startTime) > 1400000000)
    
        Score();
        startTime = TimeUtils.nanoTime();
    
    SCORE = String.valueOf(k);

    for(int i =0 ; i< tubes.size;i++)
    
        Tube tube= tubes.get(i);
        if (cam.position.x - (cam.viewportWidth/2) > tube.getPosTopTube().x + tube.getTopTube().getWidth())
        
            tube.reposition(tube.getPosTopTube().x + ((Tube.TUBE_WIDTH + TUBE_SPACING) *TUBE_COUNT));
        
        if(tube.collides(bird.getBounds()))
        
            cam.position.x = bird.getPosition().x;
            mainMusic.stop();
            gsm.set(new GameOverState(gsm));
            l=k;
        

        else
            cam.position.x = bird.getPosition().x +80;
    
    if (bird.getPosition().y <= ground.getHeight())
        gsm.set(new GameOverState(gsm));
        l = k;
    

    cam.update();


@Override
public void render(SpriteBatch sb) 

    sb.setProjectionMatrix(cam.combined);
    sb.begin();
    sb.draw(actualGamebg, cam.position.x - (cam.viewportWidth/2), 0);
    sb.draw(bird.getTexture(), bird.getPosition().x , bird.getPosition().y);
    for(Tube tube: tubes) 

        sb.draw(tube.getTopTube(), tube.getPosTopTube().x, tube.getPosTopTube().y);
        sb.draw(tube.getBottomTube(), tube.getPosBottomTube().x, tube.getPosBottomTube().y);
    
    sb.draw(ground,groundPos1.x,groundPos1.y);
    sb.draw(ground,groundPos2.x,groundPos2.y);

    font24.draw(sb,SCORE,cam.position.x -2,cam.position.y + 15);
    sb.end();


/**
 * spritebatches must be drawn in order .The one at the bottommost acts as the top layer.
 */

@Override
public void dispose() 
    actualGamebg.dispose();
    bird.dispose();
    font24.dispose();
    for(Tube tube: tubes)
    
        tube.dispose();
    
    ground.dispose();

    System.out.println("Play State Disposed");


private void updateGround()

    if (cam.position.x-(cam.viewportWidth/2) > groundPos1.x + ground.getWidth())
    
        groundPos1.add(ground.getWidth()*2,0);
    
    if (cam.position.x-(cam.viewportWidth/2) > groundPos2.x + ground.getWidth())
    
        groundPos2.add(ground.getWidth()*2,0);
    


public void Score()

    k++;
    scoreIncrease.play();
    scoreIncrease.setVolume(0.3f);


public int getL()
    return l;


public void fontGenerator()
    FreeTypeFontGenerator generator = new FreeTypeFontGenerator(Gdx.files.internal("bitmapfont/PressStart2P.ttf"));
    FreeTypeFontGenerator.FreeTypeFontParameter parameter= new FreeTypeFontGenerator.FreeTypeFontParameter();

    parameter.size=12;
    parameter.color= Color.GOLD;
    parameter.borderColor= Color.GOLDENROD;
    font24= generator.generateFont(parameter);
    font24.setUseIntegerPositions(false);

然后它转换为 GameOverState，即：

package com.mygdx.game.States;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.audio.Music;
import com.badlogic.gdx.graphics.Color;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.BitmapFont;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.graphics.g2d.freetype.FreeTypeFontGenerator;
import com.badlogic.gdx.math.Vector2;
import com.mygdx.game.GrumpyDemo;
import com.mygdx.game.States.PlayState;

/**
  * Created by Kronos on 28-01-2017.
  */

public class GameOverState extends State 
private Texture gameOver;
private Texture gameOverBg;
private Texture playAgainBtn;
private Texture ground;
private Vector2 groundPos1;
private Music gameOverMusic;
private BitmapFont totalScore;
private String STRING;
public PlayState playState;
public Boolean AdStart = true;

public GameOverState(GameStateManager gsm) 
    super(gsm);
    cam.setToOrtho(false, GrumpyDemo.WIDTH/2,GrumpyDemo.HEIGHT/2);

    gameOver = new Texture("gameover.png");
    gameOverBg =  new Texture ("bg.png");
    playAgainBtn = new Texture("playbtn.png");
    ground = new Texture("ground.png");
    AdStart = new Boolean(true);
    gameOverMusic = Gdx.audio.newMusic(Gdx.files.internal("gameoversfx.ogg"));
    groundPos1 = new Vector2(cam.position.x -cam.viewportWidth/2, -30);
    totalScore =  new BitmapFont();
    STRING = new String();
    playState = new PlayState(gsm);
    gameOverMusic.play();
    gameOverMusic.setVolume(1.0f);


@Override
public void handleInput() 
    if (Gdx.input.justTouched())
    
        gsm.set(new PlayState(gsm));
        gameOverMusic.stop();
        AdStart = false;
    


@Override
public void update(float dt) 
    handleInput();
    STRING = "SCORE: " + playState.getL();
    fontGenerator();


@Override
public void render(SpriteBatch sb) 
    sb.setProjectionMatrix(cam.combined);
    sb.begin();
    sb.draw(gameOverBg,0,0);
    sb.draw(gameOver, cam.position.x-gameOver.getWidth()/2 , 5*(cam.position.y/3));
    sb.draw(ground,groundPos1.x,groundPos1.y);
    sb.draw(playAgainBtn,cam.position.x-playAgainBtn.getWidth()/2,2*(cam.position.y/3));
    totalScore.draw(sb,STRING,cam.position.x - gameOver.getWidth()/4 ,5*(cam.position.y/4));

    sb.end();


@Override
public void dispose() 
    gameOver.dispose();
    gameOverBg.dispose();
    playAgainBtn.dispose();
    ground.dispose();
    totalScore.dispose();
    playState.dispose();

    System.out.println("Game Over State Disposed");


public void fontGenerator()
    FreeTypeFontGenerator generator = new FreeTypeFontGenerator(Gdx.files.internal("bitmapfont/PressStart2P.ttf"));
    FreeTypeFontGenerator.FreeTypeFontParameter parameter= new FreeTypeFontGenerator.FreeTypeFontParameter();

    parameter.size=12;
    parameter.color= Color.GOLD;
    parameter.borderColor= Color.GOLDENROD;
    totalScore= generator.generateFont(parameter);
    totalScore.setUseIntegerPositions(false);


public Boolean getAdStart()
    return AdStart;

我还是新手，所以如果问题被问得不恰当，请原谅我。 非常感谢任何帮助。

【参考方案1】：

当您移动到 ​​GameOverState 时，您需要停止播放 PlayState 的音乐。

当鸟的位置低于地面高度时，我检查你忘记停止播放状态的音乐。

if (bird.getPosition().y <= ground.getHeight())
        gsm.set(new GameOverState(gsm));
        l = k;

无需在每次调用 PlayState 或/和 GameOverState 时创建音乐实例。立即制作并使用它，直到您玩游戏为止。退出游戏时处置您的资产，例如音乐等。

在一些大型/重型游戏中，当资产非常大时，当我们从一个场景移动到另一个场景时需要处理一些资产。