Android Question Get name of File from ContentChooser result?

JohnC

Well-Known Member
Licensed User
I wish to obtain the filename of the selected file from the content chooser.

For example, content chooser could return:

B4X:
Wait For CC_Result (Success As Boolean, Dir As String, FileName As String)
Directory = "ContentDir"
Filename = "content://com.android.externalstorage.documents/document/0000-0000%3AASLogo.jpg"

I know that the filename that I chose is "ASLogo.jpg".

And I see that there is a colon (%3A) right before the filename at the end of the string.

So, my questions are:

1) Is that last %3A guaranteed to ALWAYS be included in a content string and be the last delimiter before the filename?
2) And if not, what is a good way to get the filename returned from CC no matter what format it returns?
 

JohnC

Well-Known Member
Licensed User
OK, I created this routine to extract the filename, but it is making a few assumptions:

1) That real file paths will always start with "/"
2) That content uri's will always have "%3A" at the end, before the file name.

B4X:
Sub GetFileNameFromContentResult(UriString As String) As String
    If UriString.StartsWith("/") Then 'If the user used a file manager to choose file
        Return UriString.SubString2(UriString.LastIndexOf("/")+3,UriString.Length)
    else if UriString.StartsWith("content:") Then
        If UriString.IndexOf("%3A") > -1 Then
            Return UriString.SubString2(UriString.LastIndexOf("%3A")+3,UriString.Length)
        Else if UriString.IndexOf("/") > -1 Then
            Return UriString.SubString2(UriString.LastIndexOf("/")+3,UriString.Length)
        Else
            Return UriString
        End If
    Else
        Return UriString
    End If
End Sub
But, are these assumptions correct, or will there be exceptions?
 
Last edited:
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