Android Question Best option to add a layout with size variable on CustomListView?

Alberto Iglesias · Jan 30, 2019

Hello all,

Anyone knows what's the best solution to put some layout with size variable on CustomListView?

My scenario:

I have a layout with one image, and this image is resizable according with width of screen, so, this image grow to keep square depending of width:

and I dont want to show this space on CustomListView between on row and another

the problem is this iHeight related below:

What's the best option to calculate the height of this new panel with this layout?

B4X:

    Dim p As Panel = xui.CreatePanel("")
    p.Initialize("")
    p.SetLayoutAnimated(  0, 0, 0, pCLV.AsView.Width, iHeight)
    pCLV.Add(p, "")
    p.LoadLayout(strLayout)

Thanks in advance

Erel · Jan 30, 2019

What do you want to show under the ImageView?

Alberto Iglesias · Jan 30, 2019

Nothing... just the panel with borders, to keep like card inside customlistview

Alberto Iglesias · Jan 30, 2019

My solution was:

First, put this methods on CustomListView:

B4X:

public Sub SetScrollViewInnerHeight(Height As Double)
    sv.ScrollViewContentHeight = Height
End Sub

public Sub GetScrollViewInnerHeight() As Double
    Return sv.ScrollViewContentHeight
End Sub

and in the code, after loading the panel with layout, I decrease the height based on components of this new layout, look:

B4X:

    Dim dMax As Double
    For Each v As View In p.GetAllViewsRecursive
        If (v.Top + v.Height) > dMax Then dMax = v.Top + v.Height
    Next
    Dim iCLVHeight As Double = iHeight - (dMax+5dip)
    pCLV.SetScrollViewInnerHeight(pCLV.GetScrollViewInnerHeight - iCLVHeight)

Is working fine, but I need to know if is this a best pratice to do that!

Erel · Jan 30, 2019

It is definitely not the best practice. Avoid changing the code.

1. I recommend you to remove the call to AutoScaleAll from the item layout.
2. It should be very simple to correctly calculate the required height based on the width. Set the item's height correct when you add it.

Alberto Iglesias · Jan 30, 2019

ok about autoscaleall but I don't understand how i can get the correct value of height BEFORE add it, because the height is calculated after load in the panel

Erel · Jan 30, 2019

Very simple. Click on imgFoto1 in the designer and find its top property. The item's height is <top value>dip + pCLV.AsView.Width - 6dip (the exact value depends on the distances set in the designer).

Alberto Iglesias · Jan 30, 2019

Ok. I understand for this specific layout, but I will construct something more clever, to works with any layout, to now worry about calculations.

Thanks for explanations!

Android Question Best option to add a layout with size variable on CustomListView?

Alberto Iglesias

Well-Known Member

Erel

B4X founder

Alberto Iglesias

Well-Known Member

Alberto Iglesias

Well-Known Member

Erel

B4X founder

Alberto Iglesias

Well-Known Member

Erel

B4X founder

Alberto Iglesias

Well-Known Member

Similar Threads

Android Question Best option to add a layout with size variable on CustomListView?

Well-Known Member

B4X founder

Well-Known Member

Well-Known Member

B4X founder

Well-Known Member

B4X founder

Well-Known Member

Similar Threads

Privacy & Transparency

Privacy & Transparency