libgdx学习记录15——音乐Music播放

背景音乐是游戏中必备的元素，好的背景音乐能为游戏加分不少，使人更容易融入到游戏的氛围中去。
Music类中主要有以下函数：
play()播放
stop()停止
pause()暂停
setVolume()设置音量
setLooping()是否循环播放
代码示例：
  1 package com.fxb.newtest;
  2 
  3 import com.badlogic.gdx.ApplicationAdapter;
  4 import com.badlogic.gdx.Gdx;
  5 import com.badlogic.gdx.audio.Music;
  6 import com.badlogic.gdx.audio.Sound;
  7 import com.badlogic.gdx.graphics.Color;
  8 import com.badlogic.gdx.graphics.GL10;
  9 import com.badlogic.gdx.scenes.scene2d.Actor;
 10 import com.badlogic.gdx.scenes.scene2d.InputEvent;
 11 import com.badlogic.gdx.scenes.scene2d.InputListener;
 12 import com.badlogic.gdx.scenes.scene2d.Stage;
 13 import com.badlogic.gdx.scenes.scene2d.ui.Label;
 14 import com.badlogic.gdx.scenes.scene2d.ui.Skin;
 15 import com.badlogic.gdx.scenes.scene2d.ui.Slider;
 16 import com.badlogic.gdx.scenes.scene2d.ui.Table;
 17 import com.badlogic.gdx.scenes.scene2d.ui.TextButton;
 18 import com.badlogic.gdx.scenes.scene2d.utils.ChangeListener;
 19 
 20 public class Lib015_Music extends ApplicationAdapter{
 21     
 22     Music music;
 23     Sound sound;
 24     
 25     Skin skin;
 26     Stage stage;
 27     State state;
 28     
 29     enum State{ music_play, music_stop, music_pause };
 30     
 31     @Override
 32     public void create() {
 33         // TODO Auto-generated method stub
 34         super.create();
 35         
 36         music = Gdx.audio.newMusic( Gdx.files.internal( "audio/xjwq.mp3" ) );
 37         music.setLooping( true );
 38         music.setVolume( 0.5f );
 39         //music.play();
 40     
 41         stage = new Stage();
 42         skin = new Skin( Gdx.files.internal( "skin/uiskin.json" ) );
 43         final TextButton buttonStop = new TextButton( "Stop", skin );
 44         TextButton buttonPlay = new TextButton( "Play/Pause", skin );
 45         
 46         state = State.music_stop;
 47         buttonStop.setDisabled( true );
 48         buttonStop.addListener(new InputListener(){
 49             public boolean touchDown(InputEvent event, float x, float y,int pointer, int button) {
 50                 // TODO Auto-generated method stub
 51                 return true;
 52             }
 53             public void touchUp(InputEvent event, float x, float y,int pointer, int button) {
 54                 // TODO Auto-generated method stub
 55                 if( state != State.music_stop ){
 56                     music.stop();
 57                     state = State.music_stop;
 58                     buttonStop.setDisabled( true );
 59                     System.out.println( "stop" );
 60                 }
 61             }            
 62         });
 63         
 64         buttonPlay.addListener(new InputListener(){
 65             public boolean touchDown(InputEvent event, float x, float y,int pointer, int button) {
 66                 // TODO Auto-generated method stub
 67                 return true;
 68             }
 69             public void touchUp(InputEvent event, float x, float y,int pointer, int button) {
 70                 // TODO Auto-generated method stub
 71                 if( state == State.music_play ){
 72                     music.pause();
 73                     state = State.music_pause;
 74                     System.out.println( "pause" );
 75                 }
 76                 else{
 77                     music.play();
 78                     state = State.music_play;
 79                     buttonStop.setDisabled( false );    
 80                     System.out.println( "play" );
 81                 }                            
 82                 //(state==State.music_play)? music.pause(): music.play();
 83             }            
 84         });    
 85         
 86             
 87         final Slider slider = new Slider( 0, 100, 1, false, skin );
 88         slider.addListener(new ChangeListener(){
 89             public void changed(ChangeEvent event, Actor actor) {
 90                 // TODO Auto-generated method stub
 91                 music.setVolume( slider.getValue()/100 );
 92             }        
 93         });
 94         
 95         slider.setValue( 50 );
 96         Table table = new Table();
 97         table.defaults().space(5);
 98 
 99         table.row();
100         table.add( new Label( "Music Play", skin )  ).colspan(2).expandX();
101         table.row();
102         table.add( slider ).colspan(2).expandX();
103         table.row();
104         table.add( buttonPlay ).minWidth(100);
105         table.add( buttonStop ).minWidth(100);
106         table.pad( 10 );
107         table.pack();
108         table.setBackground( skin.newDrawable( "white", Color.PINK ) );
109 
110         stage.addActor( table );
111         table.setPosition( stage.getWidth()/2-table.getWidth()/2, stage.getHeight()/2-table.getHeight()/2 );
112         Gdx.input.setInputProcessor( stage );
113     }
114 
115     @Override
116     public void render() {
117         // TODO Auto-generated method stub
118         super.render();
119         
120         Gdx.gl.glClearColor( 1, 1, 1, 1 );
121         Gdx.gl.glClear( GL10.GL_COLOR_BUFFER_BIT );
122         
123         stage.act();
124         stage.draw();
125     }
126 
127     @Override
128     public void dispose() {
129         // TODO Auto-generated method stub
130         music.dispose();
131         super.dispose();
132     }
133 
134 }
运行效果：
中间滑动条是调节音量的，左下是播放暂停键，右下是停止键。
另外Sound与Music类似。