https://github.com/yongfengnice/android11SafDemo/blob/main/app/src/main/java/com/example/safdemo/utils/DocumentHelper.java
具体github项目地址:https://github.com/yongfengnice/android11SafDemo
android开发android11分区存储SAF迁移工具类
原文:https://www.cnblogs.com/yongfengnice/p/15233829.html