Android Question Split list into chunks

apty · Oct 22, 2018

I have a list with 50 items. How can i split the list into 10 items each and load the first 10 in panel 1, the next 10 in panel 2 etc upto 5 panels?. The panels are from sliding panels tutorial.

I want each panel to hold 10 items (10 buttons to be specific).

Peter Simpson · Oct 22, 2018

Have you seen this, maybe you can adapt it somehow...

https://www.b4x.com/android/forum/threads/xui-customlistview-with-floating-titles.87935/#content

DonManfred · Oct 22, 2018

apty said:
I want each panel to hold 10 items (10 buttons to be specific).

Where is the problem? Iterate through the list and create a new panel on ever 10th item....
What have you tried so far? <- Do not expect us to write the code for you!

apty · Oct 22, 2018

I tried the below code but it loads everything in first panel

B4X:

Dim panels(4) As Panel
    Dim lt As Int=0
    Dim tp As Int=0
    For i = 0 To panels.Length - 1
        panels(i).Initialize("panels")
        panels(i).Color = Colors.RGB(Rnd(0, 255), Rnd(0, 255), Rnd(0, 255))
        For j=0 To 50
            Dim btn As Button
            btn.Initialize("")
            btn.Text="Hi"
            panels(i).AddView(btn,Activity.Width/5*lt,Activity.Width/5*tp,100dip,100dip)
            lt=lt+1
            If lt=5 Then
                tp=tp+1
                lt=0
            End If
            If j=10 Then
               
                Activity.AddView(panels(i), 100%x, 0, 100%x, 100%y - 80dip)
                Activity.AddMenuItem("Panel #" & i, "Menu")
            End If
        Next
        
        

        
    Next

DonManfred · Oct 22, 2018

apty said:
If j=10 Then

Activity.AddView(panels(i), 100%x, 0, 100%x, 100%y - 80dip)
Activity.AddMenuItem("Panel #" & i, "Menu")
End If

you are only adding the panel at index 10. Other panels are not added. Why?

apty · Oct 22, 2018

The panels are added but all 50 buttons are on first panel. The rest 4 panels are empty with no buttons

DonManfred · Oct 22, 2018

apty said:
The panels are added but all 50 buttons are on first panel. The rest 4 panels are empty with no buttons

the problem is in your code. You are adding all to the first panel

udg · Oct 22, 2018

I have a list with 50 items

Iterating from 0 to 50 gives you 51 items..
And

Dim panels(4)

gives you 4 panels (0 to three)..

j div 10 will give you 0 for first block (0..9), 1 for second block (10..19) and so on. So the integer part of the divison is what you need to identify the right panel.
j mod 10 will give you the "order position" of an item on its panel (returns 0..9)

apty · Oct 22, 2018

Thanks.Where do i place the j div 10 or j mod 10 in the code?

Star-Dust · Oct 22, 2018

apty said:
I have a list with 50 items. How can i split the list into 10 items each and load the first 10 in panel 1, the next 10 in panel 2 etc upto 5 panels?. The panels are from sliding panels tutorial.

I want each panel to hold 10 items (10 buttons to be specific).

See this
https://www.b4x.com/android/forum/threads/sd-viewextra.87236/#post-552093

And
https://www.b4x.com/android/forum/threads/sd-menu-with-animation.80908/#content

Android Question Split list into chunks

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