ContentResolver - how to get file name from Uri

Question

I call startActivityForResult with Intent ACTION_GET_CONTENT. Some app returns me data with this Uri:

content://media/external/images/media/18122

I

Answer 1

For anyone using Kotlin who has the same problem, you can define an extension method to get the file name and size (in bytes) in one fell swoop. If it is unable to retrieve the fields, it returns null.

fun Uri.contentSchemeNameAndSize(): Pair? {
    return contentResolver.query(this, null, null, null, null)?.use { cursor ->
        if (!cursor.moveToFirst()) return@use null

        val name = cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME)
        val size = cursor.getColumnIndex(OpenableColumns.SIZE)

        cursor.getString(name) to cursor.getInt(size)
    }
}

Use it thusly

val nameAndSize = yourUri.contentNameAndSize()
// once you've confirmed that is not null, you can then do
val (name, size) = nameAndSize

It might throw an exception, but it hasn't ever done so for me (as long as the URI is a valid content:// URI).