Android歌词秀设计思路（6）运用Proxy设计模式简化歌词播放服务(3)

              mPlaybackService.setNotificationProvider(mNotificationProvider); 
              if(mConnectionListener != null){ 
               mConnectionListener.onServiceConnected(); 
              } 
          } 
 
          public void onServiceDisconnected(ComponentName className) { 
           mPlaybackService.setLyricPlayerListener(null); 
           mPlaybackService = null; 
           if(mConnectionListener != null){ 
               mConnectionListener.onServiceDisconnected(); 
              } 
          }    
   };  
 演员新入行，有时需要把一个指令分解，一步一步的指挥。经纪人也不容易啊。
void startAndBindService(){
    mContextWrapper.startService(new Intent(mContextWrapper ,LyricPlayerService.class));   
    mContextWrapper.bindService(new Intent(mContextWrapper, LyricPlayerService.class), mPlaybackConnection, Context.BIND_AUTO_CREATE); 
} 
 
void stopService(){ 
    if(mPlaybackService != null){ 
        mContextWrapper.stopService(new Intent(mContextWrapper ,LyricPlayerService.class)); 
    } 
} 
经纪人做的挺好，干脆就不见小演员了，全又经纪人传话算了，这样一来，小演员来不来就没有什么关系了。
public String getTitle(){ 
    if(mPlaybackService != null){ 
        return mPlaybackService.getTitle(); 
    }else{ 
        return null; 
    } 
} 
 
public void setMediaInfoProvider(MediaPlayerService.MediaInfoProvider provider) { 
    mPlaybackService.setMediaInfoProvider(provider); 
} 
 
public void setNotificationProvider(MediaPlayerService.NotificationProvider provider){ 
    mNotificationProvider = provider; 
} 
 
public String getDataSource(){ 
    if(mPlaybackService != null){