https://www.jianshu.com/p/2de0113b3164
https://blog.csdn.net/wulex/article/details/72899363
getPath()与getAbsolutePath()
https://blog.csdn.net/a172131234/article/details/48948939
Android11适配
https://blog.csdn.net/da_caoyuan/article/details/109486444
郭神讲解：
https://blog.csdn.net/guolin_blog/article/details/105419420
手机厂商每次版本更新给出的适配方案：（OPPO手机厂商为例）
https://open.oppomobile.com/wiki/doc#id=10960
key：
emulate 仿真，模拟
getExternalCacheDir()--------------------/storage/emulated/0/Android/data/com.floruit.fruitsvideo/cache
