音乐播放器（MusicPlayer）四大基础功能实践（初学者良贴）
程序提供了四个实现音乐播放器的基础功能，具体见`详情`。每个music_play_中的Activity都可独立运行。
1.music_play_1
基于Service的音乐播放器的实现。
2.music_play_2
仅播放本地音频和断点续传下载的实现。
3.music_play_3
在线请求网络音频资源（json数据解析）的实现。
4.music_play_4
基于LrcView的歌词滚动控件的实现。（以本地音频资源为例）
引自[https://github.com/wangchenyan/LrcView]
5.music_play_5
基于LrcView的歌词滚动控件的实现。（以网络音频资源为例）
此部分包含两种实现方法，TestActivity直接实现，Test2Activity在PlayerTwo封装的基础上实现。
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