Android Question Huawei P20 and ExpandableCLV

[Cableguy]

Hi guys,

It's been a while… trying to pass the time in these troublesome times, I decided to restart a few projects, and got back into development.
I have an Huawei P20 and a very simple layout consisting of a "Title" panel (with a label, a textfield, 2 checkboxes and a button) and a ExtendableCLV.
For now I am populating with "only" 288 items. each Item's layout is exactly the same and are set in the layout, so they are static, except for 12 labels in each item.

I am getting a lag everytime I reload/recreate the CLV of about 2/3 seconds... is this considered "normal"?

 

[Peter Simpson]

@hello @Cableguy,
I do find that my Huawei test devices including my Huawei Y6 2019 can be a bit laggy at times. The Y6 2019 is actually set to factory default and only has B4A-Bridge installed on it. But saying that, looking at the specs on your phone you should not gave any lag at all...

 

[sorex]

it seems that you're creating a few thousands of views at once?

then it's normal that it will lag.

try adding them while you scroll through them.

 

[josejad]

Maybe a good chance to test this:

xListview

xCLV now supports adding huge numbers of items smoothly using Preoptimized class , you should use it instead : https://www.b4x.com/android/forum/threads/preoptimizedclv-lazy-loading-extension-for-xcustomlistview.115289/ I'd like to share my first B4A library, Using xListview you can add tens...

www.b4x.com

BTW @Cableguy we've miss you. I hope everything is fine

 

[josejad]

And of course, perfect chance to see the brilliant new Peter Simpson's Tutorials

? Part 1 Basics - Creating long lists using xCustomListView with Lazy Loading - Newer developers

Hello All After thinking about it yesterday and having a quick chat with Erel, I decided that my previous long list examples were not basic enough for newer B4X developers, so I put together a minimal xCLV with LL code example together with comments in the code module. There are no themes...

www.b4x.com

? Part 2 Examples - Creating long lists using xCustomListView with Lazy Loading - Newer developers

Hello All, If you're not experienced with using xCustomListView (xCLV) with Lazy Loading (LL) when it comes to loading long lists of data, then I strongly suggest that you read the following post first >>>? Part 1 Basics > XcustomListView

www.b4x.com

 

[Cableguy]

I have juggled a bit with the creation of the views so the lag now is quite minimal and bearable. Thank for the inputs

 

[Cableguy]

And of course, perfect chance to see the brilliant new Peter Simpson's Tutorials

? Part 1 Basics - Creating long lists using xCustomListView with Lazy Loading - Newer developers

Hello All After thinking about it yesterday and having a quick chat with Erel, I decided that my previous long list examples were not basic enough for newer B4X developers, so I put together a minimal xCLV with LL code example together with comments in the code module. There are no themes...

www.b4x.com

? Part 2 Examples - Creating long lists using xCustomListView with Lazy Loading - Newer developers

Hello All, If you're not experienced with using xCustomListView (xCLV) with Lazy Loading (LL) when it comes to loading long lists of data, then I strongly suggest that you read the following post first >>>? Part 1 Basics > XcustomListView

www.b4x.com

Thanks, @José J. Aguilar , I will check them out.
For now all is well, doing the confinement adds a very special layer of stress... Not used to.

 

[Erel]

You need to switch to lazy loading.
I've attached an example of simple lazy loading (the content items aren't reused).

 

[beltrao73]

Hi Erel,

I teste your example with a loop of 3000 itens, and it took a while to load, probably becuse of the CreateItem call inside the For Loop.

Sub Activity_Create(FirstTime As Boolean)
    Activity.LoadLayout("1")
    expandable.Initialize(clv1)
    For i = 1 To 3000
        Dim clr As Int = Rnd(0xFF000000, 0xFFFFFFFF)
        Dim p As B4XView = CreateItem(clr, "Item #" & i, Rnd(100dip, 300dip) + 60dip)
        clv1.Add(p, expandable.CreateValue(p, clr))
    Next
End Sub

Could it be moved to then clv1_VisibleRangeChanged Sub?

 

[Erel]

No. Do you really need to add 3000 items? No user will ever want to scroll 3000 items.

Another option is to add more items as the user scrolls. Example: https://www.b4x.com/android/forum/threads/118486/#content