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Android 调节响铃音量 var audioManager = getSystemService(Context.AUDIO_SERVICE) as AudioManager audioManager.setStreamVolume(AudioManager.STREAM_ALARM, 3, AudioManager.FLAG_SHOW_UI)

https://github.com/xitu/gold-miner/blob/master/TODO/audio-focus-1.md https://github.com/xitu/gold-miner/blob/master/TODO/audio-focus-2.md https://github.com/xitu/gold-miner/blob/master/TODO/audio-focus-3.md