how to preserve folders and downloaded files of the app during uninstalling app

Question

在卸载我的应用程序时，所有通过该应用程序下载的歌曲均被删除。

Answer 1

Apparently you are saving your files in your apps private external storage. It will be deleted when uninstalling your app. See: https://developer.android.com/training/basics/data-storage/files.html#WriteExternalStorage

Use

Environment.getExternalStorageDirectory()

to get the primary external storage location and create a directory for eg your downloads and save them there.

https://developer.android.com/reference/android/os/Environment.html#getExternalStorageDirectory()