File not open

[ocsike]

Hi,
I have two activity Activity1 and Activity2 with using SimpleStorageHelper class. In Activity1 I pick file and strore filepath into a database. In Activity2 I read the filepath from datatbase and try to open with DocumentFileCompat.fromFullPath method, but it does not work, unless in Activity1 I call openfolderpicker too. What's wrong in my solution?

[anggrayudi]

Android 10 framework does not allow you to retain the file access once the app is killed, that's why DocumentFileCompat.fromFullPath() returned null. So, storing the file path into a database is not a good idea, unless you have the URI access granted for its parent folder. So, if you want to keep the file access in long-term purpose, you will need to request access to its parent folder first. It can be done via SimpleStorage#requestStorageAccess().

Suppose that your file is in /storage/emulated/0/Pictures/selfie.jpg, then you need to request access for /storage/emulated/0/Pictures, so accessing selfie.jpg will be possible in the future. Example:

storageHelper.onStorageAccessGranted = { _, root ->
    Toast.makeText(
        this,
        getString(com.anggrayudi.storage.R.string.ss_selecting_root_path_success_without_open_folder_picker, root.getAbsolutePath(this)),
        Toast.LENGTH_SHORT
    ).show()
}
storageHelper.requestStorageAccess(initialPath = FileFullPath(this, "/storage/emulated/0/Pictures"))

After the user granted access to your request, then DocumentFileCompat.fromFullPath() will return a result:

val picture = DocumentFileCompat.fromFullPath(this, "/storage/emulated/0/Pictures/selfie.jpg")

[ocsike]

Ok, thanks.