Android Course Project 4
实现一个简单的播放器，要求功能有：
 打开程序主页面 |
 开始播放 |
 暂停 |
停止 |
附加内容（加分项，加分项每项占10分）
1.选歌
用户可以点击选歌按钮自己选择歌曲进行播放，要求换歌后不仅能正常实现上述的全部功能，还要求选歌成功后不自动播放，重置播放按钮，重置进度条，重置歌曲封面转动角度，最重要的一点：需要解析mp3文件，并更新封面图片。
为了正常运行demo，请将manual中的文件:山高水长.mp3放到/data/目录下，并打开应用的文件读取权限
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