- 音频焦点行为（优先级、回避）
- 音量曲线映射
- 路由决策
- 与其他音频流的交互
可能的映射
说明：
- 优先级较高的音频使用类型可能会中断优先级较低的音频使用类型
- 中断后，流可能：
- 已回避（音量减小）
- 已暂停
- 已停止
- 已释放
- 可以使用以下项对焦点进行显示管理
枚举成员
USAGE_NONE
USAGE_NONE:0
USAGE_MEDIA
USAGE_MEDIA:1
USAGE_COMMUNICATION
USAGE_COMMUNICATION:2
USAGE_ALARM
USAGE_ALARM:3
USAGE_NOTIFICATION
USAGE_NOTIFICATION:4
USAGE_ACCESSIBILITY
USAGE_ACCESSIBILITY:5
USAGE_ANNOUNCEMENT
USAGE_ANNOUNCEMENT:6
USAGE_NAVIGATION
USAGE_NAVIGATION:7
USAGE_RING
USAGE_RING:8
USAGE_VOICE_ASSISTANT
USAGE_VOICE_ASSISTANT:9
USAGE_SYSTEM
USAGE_SYSTEM:10
USAGE_VOICE_RECOGNITION
USAGE_VOICE_RECOGNITION:11
USAGE_VOICE_PROMPT
USAGE_VOICE_PROMPT:12
USAGE_SPOKEN_WORD_CONTENT
USAGE_SPOKEN_WORD_CONTENT:13
USAGE_TEXT_READER
USAGE_TEXT_READER:14
USAGE_FLASH_BRIEFING
USAGE_FLASH_BRIEFING:15
