程序下载文件时报错，提示
Caused by: java.lang.SecurityException: Unsupported path /data/data/com.ex.ftjh/files/test.mp4
Android 10或者11吗？SecurityException: Unsupported path 应该是路径权限问题，参考如下解决试试：
https://blog.csdn.net/u013164293/article/details/114633907?spm=1001.2014.3001.5502