Android Question How to refer to controls inside a panel which is inside the customlistview?

Hanz · Jul 4, 2021

We can put a panel inside the listview(xcustomlistview) as cell item. The panel may contain controls, eg. button, label, etc. We use this panel and the controls therein many times. My question is, how can we refer to them individually?

In case, the question is confusing, let me illustrate.

B4X:

+----------------------------+
|   label1   label2          |   <---------- a panel with two labels
+----------------------------+

+----------------------------+
|   the panel as list item   |    label2.text = "dog"
+----------------------------+
| the panel is used again    |  label2.text = "cat"
+----------------------------+
| the panel used 3rd time    |   label2.text = "mouse"
+----------------------------+

Now, I will go to label1_click and say, I do like this:

B4X:

log(label2.text)

If I click label1 of the three items, I always get the value of label2 of the third listitem and that is "mouse". How can I refer to individual labels and get their specific/individual values or properties

mcqueccu · Jul 4, 2021

B4X:

dim lbl as B4xview = xclv.GetView(1)
Log(lbl.text)

aeric · Jul 4, 2021

[B4X] [XUI] xCustomListView - cross platform CustomListView

Update: As several other libraries depend on xCustomListView library, it is no longer recommended to use the code module. Use the library instead. There are several extension classes that add more features to xCLV. They are listed at the end of this post. Video tutorial: xCustomListView is...

www.b4x.com

If you follow this tutorial, the first video (jump to 15:50) you will see, you can use

B4X:

Dim index As Int = CLV1.GetItemFromView(Sender)

to get the list item you click on.

William Lancee · Jul 4, 2021

I think that the problem is that the panel is re-used rather than a new panel for each item. Check that you are using a new clone of the panel.

Probably in your case something like:

B4X:

        Dim pnl As B4XView = xui.CreatePanel("")
        pnl.LoadLayout("CLVCell2")

Hanz · Jul 5, 2021

William Lancee said:
I think that the problem is that the panel is re-used rather than a new panel for each item. Check that you are using a new clone of the panel.

Probably in your case something like:

B4X:

Dim pnl As B4XView = xui.CreatePanel("") pnl.LoadLayout("CLVCell2")

This is exactly what I did.

Hanz · Jul 5, 2021

mcqueccu said:
B4X:

dim lbl as B4xview = xclv.GetView(1) Log(lbl.text)

I'm not sure if xclv has a "GetView". I don't see it.

Hanz · Jul 5, 2021

aeric said:
[B4X] [XUI] xCustomListView - cross platform CustomListView

Update: As several other libraries depend on xCustomListView library, it is no longer recommended to use the code module. Use the library instead. There are several extension classes that add more features to xCLV. They are listed at the end of this post. Video tutorial: xCustomListView is...

www.b4x.com

If you follow this tutorial, the first video (jump to 15:50) you will see, you can use

B4X:

Dim index As Int = CLV1.GetItemFromView(Sender)

to get the list item you click on.

Thanks, I get the index, my problem now is to get to a specific control, in this case the label.

mangojack · Jul 5, 2021

My take on the OP's question ...

B4X:

Sub Label1_Click
    Dim Index As Int = clv1.GetItemFromView(Sender)
    Dim pnl As B4XView = clv1.GetPanel(Index)   'the base row item panel ...

    'you first have to access your designer panel ... then the child views. (labels)
    Log(pnl.GetView(0).GetView(0).Text)    '1st label on designer panel.. refer order in Designer ViewTree for Item/Row layout
    Log(pnl.GetView(0).GetView(1).Text)    '2nd label

A little extra posted code would have clarified if you are using Label1_Click or CLV1_Click event.
If you are using the latter then remove the 1st line of code as the index is returned automatically.

Hanz · Jul 5, 2021

mangojack said:
My take on the OP's question ...

B4X:

Sub Label1_Click Dim Index As Int = clv1.GetItemFromView(Sender) Dim pnl As B4XView = clv1.GetPanel(Index) 'the base row item panel ... 'you first have to access your designer panel ... then the child views. (labels) Log(pnl.GetView(0).GetView(0).Text) '1st label on designer panel.. refer order in Designer ViewTree for Item/Row layout Log(pnl.GetView(0).GetView(1).Text) '2nd label

A little extra posted code would have clarified if you are using Label1_Click or CLV1_Click event.
If you are using the latter then remove the 1st line of code as the index is returned automatically.

For your code at line 6, I get this error

B4X:

java.lang.RuntimeException: Object should first be initialized (View).

I also use the Label1_Click, and I'm getting right the first lines of codes except the part similar to your code at line 6 where the above error message appears.

Hanz · Jul 5, 2021

mangojack said:
My take on the OP's question ...

B4X:

Sub Label1_Click Dim Index As Int = clv1.GetItemFromView(Sender) Dim pnl As B4XView = clv1.GetPanel(Index) 'the base row item panel ... 'you first have to access your designer panel ... then the child views. (labels) Log(pnl.GetView(0).GetView(0).Text) '1st label on designer panel.. refer order in Designer ViewTree for Item/Row layout Log(pnl.GetView(0).GetView(1).Text) '2nd label

A little extra posted code would have clarified if you are using Label1_Click or CLV1_Click event.
If you are using the latter then remove the 1st line of code as the index is returned automatically.

Here is the screenshot of the output:

Hanz · Jul 5, 2021

Found the answer...

B4X:

Dim index As Int = lvw.GetItemFromView(Sender)
Dim pnl As B4XView = lvw.GetPanel(index)
Dim lbl As B4XView = pnl.GetView(2) <----- the index is 2 because that is the order of the label in the designer in my case.
Log(lbl.Text)

Thanks for your replies.

aeric · Jul 5, 2021

You may also check my YouTube tutorial on creating a Todo list app using B4A
Check timeline 4:30

aeric · Jul 5, 2021

You can count the index of the child view from the Designer’s View Tree tab on the left side. Index starts from 0.

Mahares · Jul 5, 2021

Hanz said:
Found the answer...

This is a case where if the OP posted a snapshot of his views tree or a copy of his item layout in his first post, the thread would have been solved in two posts instead of 14. Remember folks, Unless warranted, the more posts are in a thread the less readable the thread becomes.

Android Question How to refer to controls inside a panel which is inside the customlistview?

Hanz

Active Member

mcqueccu

Well-Known Member

aeric

Expert

[B4X] [XUI] xCustomListView - cross platform CustomListView

William Lancee

Well-Known Member

Hanz

Active Member

Hanz

Active Member

Hanz

Active Member

[B4X] [XUI] xCustomListView - cross platform CustomListView

mangojack

Expert

Hanz

Active Member

Hanz

Active Member

Hanz

Active Member

aeric

Expert

aeric

Expert

Mahares

Expert

Similar Threads

Android Question How to refer to controls inside a panel which is inside the customlistview?

Active Member

Well-Known Member

Expert

Well-Known Member

Active Member

Active Member

Active Member

Expert

Active Member

Active Member

Active Member

Expert

Expert

Expert

Similar Threads

Privacy & Transparency

Privacy & Transparency