官方指南: https://developer.android.google.cn/guide/topics/media-apps/index.html

官方Audio样例: https://github.com/googlesamples/android-UniversalMusicPlayer

AudioDemo是UniversalMusicPlayer的简化版

Media App architectures:

• audio apps: a client/server design
• video apps: a single-activity design