Android Question Skip emtpy line by reading in a file to a listview

Dim lines As List
lines = File.ReadList(File.DirAssets, "Bestandsliste.txt")

ListViewBestand.Clear
ListViewBestand.SingleLineLayout.Label.TextSize = 14
ListViewBestand.SingleLineLayout.Label.Height = 20dip
ListViewBestand.SingleLineLayout.ItemHeight = 70
ListViewBestand.SingleLineLayout.Label.TextColor = xui.Color_Black

For Each line As String In lines
    If line.Trim.Length > 0 Then ' Skip empty lines
        ListViewBestand.AddSingleLine(line.Trim)
        Log(line)
    End If
Next

ListViewBestand.Invalidate

• Use File.ReadList: This function reads all the lines from the file into a List, which works correctly with files in the assets folder.
• Replace TextReader with a List: By reading all lines into a List, you can iterate over each line without issues.
• Keep the ListView Configuration: Your ListView settings remain the same.
• Iterate Over the List: Use a For Each loop to process each line.

JohnC said:

I ran the new issue through the new ChatGPT o1 (preview version) and this is what it said...

The issue arises because reading line by line from a file located in File.DirAssets using TextReader does not work as expected in B4A. The assets folder is read-only and has limitations when accessed directly with TextReader. Instead, you should use File.ReadList to read all lines at once into a List.

Here's the corrected code:

B4X:

Dim lines As List
lines = File.ReadList(File.DirAssets, "Bestandsliste.txt")

ListViewBestand.Clear
ListViewBestand.SingleLineLayout.Label.TextSize = 14
ListViewBestand.SingleLineLayout.Label.Height = 20dip
ListViewBestand.SingleLineLayout.ItemHeight = 70
ListViewBestand.SingleLineLayout.Label.TextColor = xui.Color_Black

For Each line As String In lines
    If line.Trim.Length > 0 Then ' Skip empty lines
        ListViewBestand.AddSingleLine(line.Trim)
        Log(line)
    End If
Next

ListViewBestand.Invalidate

Explanation:

• Use File.ReadList: This function reads all the lines from the file into a List, which works correctly with files in the assets folder.
• Replace TextReader with a List: By reading all lines into a List, you can iterate over each line without issues.
• Keep the ListView Configuration: Your ListView settings remain the same.
• Iterate Over the List: Use a For Each loop to process each line.

This modification ensures that all lines from "Bestandsliste.txt" are read correctly and added to the ListView without the endless repetition of the first line.

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