Android Kotlin: Getting a FileNotFoundException with filename chosen from file picker?

Question

I\'m working on an Android application where one of the features is to let the user choose a file to open (I\'m wanting to open a plain text .txt file). I\'ve worked on And

Answer 1

You cannot open a Java File on a ÙRI converted to a String, the "path" section of the URI has no relation to a physical file location.

Use a contentResolver to get a Java FileDescriptor to open the file with.

val parcelFileDescriptor: ParcelFileDescriptor =
            contentResolver.openFileDescriptor(uri, "r")
    val fileDescriptor: FileDescriptor = parcelFileDescriptor.fileDescriptor

This method is compatible with Android 10 where file paths for non App private directories are not usuable.

https://developer.android.com/training/data-storage/shared/documents-files