Android Question Get name of File from ContentChooser result?

[JohnC]

I wish to obtain the filename of the selected file from the content chooser.

For example, content chooser could return:

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]

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.

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?

 

[Erel]

But, are these assumptions correct, or will there be exceptions?

They are not correct.

There is no reliable way to get the file name. Content providers are not expected to return the file name in the URI.

 

[Deleted member 103]

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.

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?

Hi @JohnC ,

thank you very much for this routine.
It is a good approach, but I think with my change now looks better.

Private 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("/") + 1, UriString.Length)
    else if UriString.StartsWith("content:") Then
        If UriString.IndexOf("%3A") > -1 Then
            Return UriString.SubString(UriString.LastIndexOf("%3A") + 3)
        Else if UriString.IndexOf("/") > -1 Then
            Return UriString.SubString(UriString.LastIndexOf("/") + 1)
        Else
            Return UriString
        End If
    Else
        Return UriString
    End If
End Sub

 

[Erel]

Never use such code.

Correct code: https://www.b4x.com/android/forum/t...-received-shared-file-example.117325/#content

 

[Deleted member 103]

Never use such code.

Correct code: https://www.b4x.com/android/forum/t...-received-shared-file-example.117325/#content

Hi Erel,
Sometimes I have to agree with you.