Android Question How to get Layout Height?

Alberto Iglesias · Sep 11, 2017

Hello everyone!

Someone knows the right way to get the height of a layout?

I create a function to get the bottom of last view on layout, but not working because when I get the view.top and view.height, some views came wrong (with negative values).

B4X:

Sub FU_LayoutHeight(p As Panel) As Long
   
    Dim lMax As Long = 0
    For Each v As View In p.GetAllViewsRecursive
          Log(v.Tag & "/" & v.Top & "/" & v.Height)
          If v.Top + v.Height > lMax Then 
              lMax = v.Top + v.Height
          End If
    Next
    Return lMax
End Sub

Look the negative value of this Label (-30 ??????)

Somebody can explain that behavior?

Thank You

Alberto Iglesias

DonManfred · Sep 11, 2017

Alberto Iglesias said:
Somebody can explain that behavior?

https://developer.android.com/reference/android/view/ViewGroup.LayoutParams.html#MATCH_PARENT

https://developer.android.com/reference/android/view/ViewGroup.LayoutParams.html#WRAP_CONTENT

Erel · Sep 12, 2017

How do you load this layout?

Alberto Iglesias · Sep 12, 2017

B4X:

Dim q As Panel
q.Initialize("")
q.LoadLayout("laymosaico1")
iHeight = Funcoes.FU_LayoutHeight(q)

Wich the best way to get the bottom of last view of layout?

Erel · Sep 12, 2017

This is a mistake. Check the logs you will see a warning.

You must set the panel size before you load the layout. Is you are using B4A v7.3+ then you can set it with q.SetLayout.

Alberto Iglesias · Sep 12, 2017

OK I'm still using v6.0.0 of B4A.

I can't do something like this:

B4X:

    Dim q As Panel : q.Initialize("")
    q.Height = 1000
    q.LoadLayout("laymosaico1")

but you say to me in the version 7.3+ I can use some like this:

B4X:

    Dim q As Panel : q.Initialize("")
    q.SetLayout(......)   <- I dont know the parameters.....  Can I put Layout and Size, is correct?

DonManfred · Sep 12, 2017

https://www.b4x.com/android/help/views.html#panel_setlayout

Alberto Iglesias · Sep 12, 2017

Thanks Manfred, you think this will work?

B4X:

Dim q AsPanel : q.Initialize("")
q.SetLayout (0,0,100%x, 1000)
q.LoadLayout("laymosaico1")
iHeight = Funcoes.FU_LayoutHeight(q)

with this can I get the correct size of layout? (in iHeight valriable)

Is the only way to get the size of layout??

I just need to know the sizes of each views in layout...... :-(

DonManfred · Sep 12, 2017

Based on the Valuees you use. You already know the real height. Note that you should use 1000dp instead of 1000
Though

B4X:

Funcoes.FU_LayoutHeight(q)

will still return -1 or -2 (because you are using anchors) i guess.

Erel · Sep 13, 2017

The way to set the panel size in older versions of B4A is to add it to an Activity or any other panel:

B4X:

Activity.AddView(q, 0, 0, width, height)
q.LoadLayout(...)
q.RemoveView 'remove the panel from the activity

Alberto Iglesias · Sep 13, 2017

OK. thank you very much Erel

Alberto Iglesias · Mar 19, 2018

@DonManfred @Erel

I can't get the height of the layout after loading in a panel, like this:

B4X:

Dim q AsPanel : q.Initialize("")
q.SetLayout (0,0,100%x, 1000dp)
q.LoadLayout("laymosaico1")

I start a panel with 1000dp, but after loading some layout, I need to know where is the finish of the last object in this layout.

Do you have some idea for get the height of layout AFTER load the panel, independent of the size of panel

thanks

Erel · Mar 20, 2018

I'm not sure what you mean with "the height of layout". The panel size will never change when you call Panel.LoadLayout.

Alberto Iglesias · Mar 20, 2018

Hi Erel, my doubt is this:

I have a customlistview with different rows and each row I have a layout with different Height. like this little screenshot:

In this app I put something like this:

B4X:

        Case "layLayout1"
            iHeight = 105dip
             
        Case "layLayout2"
            iHeight = 280dip
                 
        Case "layLayout3"
            iHeight = 410dip

I understand this in unnecessary, is that right?

I can calculate the "height"of this layout to dimensioning the height of each row?

Whats the best practice to to that, without specifying size of each layout?

Thank you

Alberto Iglesias

Erel · Mar 20, 2018

It is always the container that sets the layout size. You do need something like you did.

Alberto Iglesias · Mar 20, 2018

But I can change the height of this container after load the layout or not? based on bottom of last component of this layout?

Erel · Mar 20, 2018

Alberto Iglesias said:
But I can change the height of this container after load the layout or not?

You can change it however it will not affect the views previously added.

Alberto Iglesias · Mar 20, 2018

OK. so, my solution is the correct one!

Thank you!

Android Question How to get Layout Height?

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