实现音频和视频文件的播放，包括加载音频、视频文件，播放、暂停、停止、关闭等操作，支持文件格式包括mp3、avi、mpg、rmvb等格式。-The audio and video file playback, including loading audio, video files, play, pause, stop, turn off other operations in support of file formats including. Mp3,. Avi,. Mpg,. Rmvb an