非原创，转载：http://blog.csdn.net/h623691640/article/details/51492255
关于Android获取系统音量值的文章在网上随便一搜就一大堆，我在此再整理只是为了更方便与学习，相当于做笔记吧。

                AudioManager am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

                max = am.getStreamMaxVolume(AudioManager.STREAM_VOICE_CALL);// 0
                current= am.getStreamVolume(AudioManager.STREAM_VOICE_CALL);
                Log.e("service", "通话音量值：" + max + "-" + current);

                max = am.getStreamMaxVolume(AudioManager.STREAM_SYSTEM);// 1
                current = am.getStreamVolume(AudioManager.STREAM_SYSTEM);
                Log.e("service", "系统音量值：" + max + "-" + current);

                max = am.getStreamMaxVolume(AudioManager.STREAM_RING);// 2
                current = am.getStreamVolume(AudioManager.STREAM_RING);
                Log.e("service", "系统铃声值：" + max + "-" + current);

                max = am.getStreamMaxVolume(AudioManager.STREAM_MUSIC);// 3
                current = am.getStreamVolume(AudioManager.STREAM_MUSIC);
                Log.e("service", "音乐音量值：" + max + "-" + current);

                max = am.getStreamMaxVolume(AudioManager.STREAM_ALARM);// 4
                current = am.getStreamVolume(AudioManager.STREAM_ALARM);
                Log.e("service", "闹铃音量值：" + max + "-" + current);

                max = am.getStreamMaxVolume(AudioManager.STREAM_NOTIFICATION);// 5
                current = am
                        .getStreamVolume(AudioManager.STREAM_NOTIFICATION);
                Log.e("service", "提示声音音量值：" + max + "-" + current);

                // ------还可以通过动态设置音量值的大小，方法如下：
                // public void setStreamVolume(int streamType, int index,
                // int flags);
                // streamType以上几种模式中的一种，
                // index：设置音量的大小
                // flags：标志位，不太清楚做什么的。