//获取AudioManager实例对象
AudioManager audioManage = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
//获取最大音量和当前音量,参数:STREAM_VOICE_CALL(通话)、STREAM_SYSTEM(系统声音)、STREAM_RING(铃声)、STREAM_MUSIC(音乐)和STREAM_ALARM(闹铃)
int max = audioManager.getStreamMaxVolume(