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：

 package com.fxb.newtest;

 import com.badlogic.gdx.ApplicationAdapter;
 import com.badlogic.gdx.Gdx;
 import com.badlogic.gdx.audio.Music;
 import com.badlogic.gdx.audio.Sound;
 import com.badlogic.gdx.graphics.Color;
 import com.badlogic.gdx.graphics.GL10;
 import com.badlogic.gdx.scenes.scene2d.Actor;
 import com.badlogic.gdx.scenes.scene2d.InputEvent;
 import com.badlogic.gdx.scenes.scene2d.InputListener;
 import com.badlogic.gdx.scenes.scene2d.Stage;
 import com.badlogic.gdx.scenes.scene2d.ui.Label;
 import com.badlogic.gdx.scenes.scene2d.ui.Skin;
 import com.badlogic.gdx.scenes.scene2d.ui.Slider;
 import com.badlogic.gdx.scenes.scene2d.ui.Table;
 import com.badlogic.gdx.scenes.scene2d.ui.TextButton;
 import com.badlogic.gdx.scenes.scene2d.utils.ChangeListener;

 public class Lib015_Music extends ApplicationAdapter{

     Music music;
     Sound sound;

     Skin skin;
     Stage stage;
     State state;

     enum State{ music_play, music_stop, music_pause };

     @Override
     public void create() {
         // TODO Auto-generated method stub
         super.create();

         music = Gdx.audio.newMusic( Gdx.files.internal( "audio/xjwq.mp3" ) );
         music.setLooping( true );
         music.setVolume( 0.5f );
         //music.play();

         stage = new Stage();
         skin = new Skin( Gdx.files.internal( "skin/uiskin.json" ) );
         final TextButton buttonStop = new TextButton( "Stop", skin );
         TextButton buttonPlay = new TextButton( "Play/Pause", skin );

         state = State.music_stop;
         buttonStop.setDisabled( true );
         buttonStop.addListener(new InputListener(){
             public boolean touchDown(InputEvent event, float x, float y,int pointer, int button) {
                 // TODO Auto-generated method stub
                 return true;
             }
             public void touchUp(InputEvent event, float x, float y,int pointer, int button) {
                 // TODO Auto-generated method stub
                 if( state != State.music_stop ){
                     music.stop();
                     state = State.music_stop;
                     buttonStop.setDisabled( true );
                     System.out.println( "stop" );
                 }
             }
         });

         buttonPlay.addListener(new InputListener(){
             public boolean touchDown(InputEvent event, float x, float y,int pointer, int button) {
                 // TODO Auto-generated method stub
                 return true;
             }
             public void touchUp(InputEvent event, float x, float y,int pointer, int button) {
                 // TODO Auto-generated method stub
                 if( state == State.music_play ){
                     music.pause();
                     state = State.music_pause;
                     System.out.println( "pause" );
                 }
                 else{
                     music.play();
                     state = State.music_play;
                     buttonStop.setDisabled( false );
                     System.out.println( "play" );
                 }
                 //(state==State.music_play)? music.pause(): music.play();
             }
         });    

         final Slider slider = new Slider( 0, 100, 1, false, skin );
         slider.addListener(new ChangeListener(){
             public void changed(ChangeEvent event, Actor actor) {
                 // TODO Auto-generated method stub
                 music.setVolume( slider.getValue()/100 );
             }
         });

         slider.setValue( 50 );
         Table table = new Table();
         table.defaults().space(5);

         table.row();
         table.add( new Label( "Music Play", skin )  ).colspan(2).expandX();
         table.row();
         table.add( slider ).colspan(2).expandX();
         table.row();
         table.add( buttonPlay ).minWidth(100);
         table.add( buttonStop ).minWidth(100);
         table.pad( 10 );
         table.pack();
         table.setBackground( skin.newDrawable( "white", Color.PINK ) );

         stage.addActor( table );
         table.setPosition( stage.getWidth()/2-table.getWidth()/2, stage.getHeight()/2-table.getHeight()/2 );
         Gdx.input.setInputProcessor( stage );
     }

     @Override
     public void render() {
         // TODO Auto-generated method stub
         super.render();

         Gdx.gl.glClearColor( 1, 1, 1, 1 );
         Gdx.gl.glClear( GL10.GL_COLOR_BUFFER_BIT );

         stage.act();
         stage.draw();
     }

     @Override
     public void dispose() {
         // TODO Auto-generated method stub
         music.dispose();
         super.dispose();
     }

 }

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。