// [i18n:getAudioManager]
var context = com.fanfanlo.lib.mc.LibMainModel.instance.application;
var audioManager = context.getSystemService(android.content.Context.AUDIO_SERVICE);
// [i18n:adjustVolume]
audioManager.adjustStreamVolume(android.media.AudioManager.STREAM_MUSIC,
    android.media.AudioManager.ADJUST_RAISE, android.media.AudioManager.FLAG_SHOW_UI);