Android Tutorial [B4X] B4XTable - Multiple rows selection

Edit: Don't use this code. Use B4XTableSelections class instead:

[B4X] B4XTableSelections - extended selection modes for B4XTable

B4XTableSelections extends B4XTable and adds new selection modes: SINGLE_CELL_TEMP - this is the built-in selection mode. Unlike the other selection modes it disappears automatically. SINGLE_CELL_PERMANENT - selection of a single cell. SINGLE_LINE_PERMANENT - selection of a single line...

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This example depends on B4XTable v1.02+ and B4XCollections.

It is quite simple to implement custom selection logic.

Step #1: The Selection Color property in the designer should be set to transparent. This will disable the default cell click animation.

Step #2: We maintain a B4XSet with the selected rows ids. This set is updated in the CellClicked event:

Sub B4XTable1_CellClicked (ColumnId As String, RowId As Long)
   Dim Selected As Boolean
   If SelectedRows.Contains(RowId) Then
       SelectedRows.Remove(RowId)
       Selected = False
   Else
       SelectedRows.Add(RowId)
       Selected = True
   End If
   Dim Index As Int = B4XTable1.VisibleRowIds.IndexOf(RowId) 'Find the index of the visible row
   SetRowColor(Index, Selected) 'Set its color
End Sub

Step #3: Whenever the data is updated, we need to go over the visible rows and update their visual state:

Sub B4XTable1_DataUpdated
   For i = 0 To B4XTable1.VisibleRowIds.Size - 1
       Dim RowId As Long = B4XTable1.VisibleRowIds.Get(i)
       SetRowColor(i, SelectedRows.Contains(RowId))
   Next    
End Sub

A B4J example is attached.