B4J Question List to Array

[Blueforcer]

Is there a simple way to copy the content of a List into a Array?

For now i do it like that. but because this happens every 80ms, i thought there might be a faster/simpler way.

Dim bmproot As List

Dim bmp(bmproot.Size) As Int
For index=0 To bmproot.Size-1
    bmp(index)=bmproot.Get(index)
Next

 

[PatrikCavina]

Using JavaObject you can use only 3 lines:

Dim bmproot As List
Dim joList As JavaObject = bmproot
Dim bmp() As Object = joList.RunMethod("toArray", Null)

 

[Erel]

What do you need it for?

 

[Blueforcer]

a json is holding pixeldata (16bit RGB565) for an icon.
Its used by my project https://www.b4x.com/android/forum/threads/awtrix-2-0.103226/

But i need a Array of Int to display it on the matrix.

 

[Erel]

i thought there might be a faster/simpler way.

Your code is very simple. The question is whether it is fast enough.

Test it:

    Dim bmproot As List
   bmproot.Initialize
   For i = 1 To 100000
       bmproot.Add(Rnd(1, 10000))
   Next
   
   
   Dim n As Long = DateTime.Now
   For Test = 1 To 10000
       Dim bmp(bmproot.Size) As Int
       For index=0 To bmproot.Size-1
           bmp(index)=bmproot.Get(index)
       Next
   Next
   Log((DateTime.Now - n) / 10000)

On my computer it takes 0.1ms to create the array and fill it. Tested with a list of 100k numbers.
This is of course fast enough.

 

[Blueforcer]

Youre right. I should messure it before.
But because my List contains maximum 256 Items, the time will be here no longer worth mentioning.
Thnak you!