Put the APK into the system APK directory in Android, but the so file cannot be found

For example, putting the APK directly into the system directory will cause the APK to not find the so file. The normal installation is to use the PackageManager, which will copy the so file into the so folder directory read by the system and provide it to the app for use. ; The system application does not use PackageManager to install, so before using the system application, copy the so file into the so folder directory in advance, and after restarting, the app can call the so file