AudioManager audioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
audioManager.getRingerMode() == AudioManager.RINGER_MODE_SILENT : 사일런트 모드일 경우
audioManager.getRingerMode() == AudioManager.RINGER_MODE_VIBRATE : 진동모드일 경우
audioManager.getRingerMode() == AudioManager.RINGER_MODE_NORMAL : 벨 모드일 경우
audioManager.setRingerMode(AudioManager.RINGER_MODE_NORMAL);  //
audioManager.setRingerMode(AudioManager.RINGER_MODE_VIBRATE); //진동
audioManager.setRingerMode(AudioManager.RINGER_MODE_SILENT); //무음


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