基于MVP模式的音乐播放器，可以用来学习mvp模式和MediaPlayer
有几个界面没用presenter来控制逻辑，歌词界面把情非得已写死了（有请求入口，用TODO标记了），歌曲是陈洁丽的，可以下载下来播放看歌词显示效果
感谢设计豆设计美化
个人博客：简书
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