Android歌词秀设计思路（3）通用的音乐播放服务(上)(3)

    }    
     
    public void pause() { 
        giveUpAudioFocus(); 
        mIsPausing = true; 
        mMediaPlayer.pause(); 
    } 
     
    public void playNext(){ 
        if(mMediaInfoProvider.moveToNext()){ 
            if(isPlaying() || isPausing()){ 
                stop(); 
            } 
            mDataSource = mMediaInfoProvider.getUrl(); 
            mTitle = mMediaInfoProvider.getTitle(); 
            start(); 
        } 
    } 
     
    public void playPrev(){ 
        if(mMediaInfoProvider.moveToPrev()){ 
            if(isPlaying() || isPausing()){ 
                stop(); 
            } 
            mDataSource = mMediaInfoProvider.getUrl(); 
            mTitle = mMediaInfoProvider.getTitle(); 
            start(); 
        } 
    } 
     
    public boolean isPausing(){ 
        return mIsPausing; 
    } 
     
    public boolean isPlaying() {    
        return mMediaPlayer.isPlaying();    
    }   
     
    public boolean isStop(){ 
        return (isPlaying() == false && isPausing() == false); 
    } 
     
    public int getDuration() {