audioManager = context.getSystemService("audio");
audio =android.os.ServiceManager.getService("audio");
function getVolumeInfo(context, streamType, targetVolume) {
    currentVolume = audio.getStreamVolume(streamType);
    newVolume = currentVolume + targetVolume;
    maxVolume = audio.getStreamMaxVolume(streamType);
    minVolume = 0;
    newVolume = Math.max(minVolume, Math.min(newVolume, maxVolume));
    audio.setStreamVolume(streamType, newVolume, 0, null);
    return newVolume;
}

getVolumeInfo(context, audioManager.STREAM_ALARM, 2);
// 调整闹钟音量（比如2 或 -2）
// 调节指定音量类型

#MVEL表达式 #Javascript