不同的linuandroidx系统查看端口是否开放的不同，在某些环境下，需要依赖于服务，如果Centos中并没有装相关的服务，就不一定能生效。所以具体使用哪种方法，取决于环境，可以每一种都试试。
I need to: - start / stop sounds with lengths between 0.1 and 10 seconds - change the playback volume I want to / would like to / would be nice to have to:
加载中,请稍侯......