CustomListView - A flexible list based on ScrollView

Erel · Aug 23, 2015

You can either go over all items and disable them or put a transparent panel over CLV and handle its click event.

ANSA · Aug 23, 2015

I am trying to do the first option (going over all Items ad disable them)
I wrote the following SUB, but it dose not seem to work:

'Disable all items.
Public Sub DisableAll
For i = 0 To sv.Panel.NumberOfViews - 1
sv.Panel.Enabled = False
Next
End Sub

any suggestions?
Thank you

LucaMs · Aug 23, 2015

ANSA said:
sv.Panel.Enabled = False

That is the (unique) INTERNAL panel of a ScrollView.

This code should work (I don't tried it):

B4X:

For i = 0 To YourCustomListView.GetSize - 1
    Dim pnl As Panel = YourCustomListView.GetPanel(i)
    pnl.Enabled = False
Next

ANSA · Aug 23, 2015

Hi Luca,
it did not work :-(

the funny thing is that, if I use for example (pnl.Visible = False) the code is working fine and the items becomes invisible!

but (pnl.Enabled = False) dose not make the items disabled !!!

thank yiu

LucaMs · Aug 23, 2015

Ops... panelXX.Enabled = False does not disable the "children views", If I remember well, sorry.

You should get all views of that panel (pnl in the example):

B4X:

For Each v As View In pnl.GetAllViewsRecursive
    v.Enabled = False
Next

then the code should be:

B4X:

For i = 0 To YourCustomListView.GetSize - 1
    Dim pnl As Panel = YourCustomListView.GetPanel(i)
    pnl.Enabled = False
    For Each v As View In pnl.GetAllViewsRecursive
        v.Enabled = False
    Next
Next

ANSA · Aug 23, 2015

Thanks luca for the quick reply, I am afraid it did not do anything different than the previous code!!!
any other suggestions?

MaFu · Aug 23, 2015

The transparent panel above the CLV should be the simplest solusion.

LucaMs · Aug 24, 2015

ANSA said:
Thanks luca for the quick reply, I am afraid it did not do anything different than the previous code!!!
any other suggestions?

It should work but I agree that a transparent panel is more simple and fast too (for all items).
The only drawback is that you can not scroll through the list.

LucaMs · Aug 24, 2015

LucaMs said:
It should work but I agree that a transparent panel is more simple and fast too (for all items).
The only drawback is that you can not scroll through the list.

ANSA said:
I am using "clv1" only in my program.

This is why my code does not work: it works with clv3, clv1 is different ("text only").
clv1 is created and managed in a different way.

LucaMs · Aug 24, 2015

Added "GetPanels" to CustomListView, so you can disable its text items.

ANSA · Aug 24, 2015

Thank you all VERY much.
appreciate your help

peacemaker · Sep 6, 2015

If to make the LIstview transparent, to get a custom background picture - the checkboxes looks invisible by default (very light-grey) over a light background picture.
If to try to re-draw then by https://www.b4x.com/android/forum/threads/add-border-to-views-and-change-checkbox-graphic.36436/ - old phones and modern Sony - have LIstview of several hundred items - crached due to OutOfMemory (default checkbox has no OOM issue).

ColorDrawable can be applied, but it's only for border over whole the checkbox, not to the square.
SO, question - is there possibility to change only square color of the checkbox ?

kozbot · Sep 10, 2015

Is it possible to make particular words, all different words in my list bold? I was trying to use Rich String class with it, but it doesn't seem to be working. Ideas? Thanks.

Erel · Sep 10, 2015

Yes. It will work with RichString. If you are unable to solve it then please start a new thread.

peacemaker · Sep 10, 2015

When to use an EditText view on the customlistview and use focus to get the text:

B4X:

Sub lbl_FocusChanged (HasFocus As Boolean)
Dim index As Int = cv.GetItemFromView(Sender)

...

there is the error in the sub

B4X:

Public Sub GetItemFromView(v As View) As Int

B4X:

Error occurred on line: 212 (CustomListView)
java.lang.NullPointerException
    at anywheresoftware.b4a.agraham.reflection.Reflection.runmethod(Reflection.java:205)
    at anywheresoftware.b4a.agraham.reflection.Reflection.RunMethod(Reflection.java:802)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:668)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:334)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:244)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:132)
    at anywheresoftware.b4a.BA$2.run(BA.java:299)
    at android.os.Handler.handleCallback(Handler.java:733)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:136)
    at android.app.ActivityThread.main(ActivityThread.java:5021)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:827)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:643)

in the line

B4X:

parent = r.RunMethod("getParent")

due to parent got Null after some loops.

Erel · Sep 10, 2015

Can you upload a small project that demonstrates this issue?

peacemaker · Sep 11, 2015

Erel said:
Can you upload a small project that demonstrates this issue?

Seems, no, Erel - it is complex project with several activities. And seems, this error occurs when
1) txt_FocusChanged occured, but
2) the listview is cleared at the almost same time.

So it's reproduced not always.
Maybe just a suggestion - how to be in such situation.
Now i use Try\Catch in _FocusChanged.

LucaMs · Sep 11, 2015

You should create a little sample project.

Anyway, how do you add the CustomListView? And the EditText? Probably you can post these lines.

peacemaker · Sep 11, 2015

LucaMs said:
You should create a little sample project.
Anyway, how do you add the CustomListView? And the EditText? Probably you can post these lines.

As in the sample:

B4X:

Sub CreateListItem(Text As String, Width As Int, Height As Int) As Panel
    Dim p As Panel
    p.Initialize("")
    p.Color = Colors.Transparent
    Dim chk As CheckBox
    chk.Initialize("chk")
    Dim lbl As EditText
    lbl.Initialize("lbl")
    lbl.InputType = lbl.INPUT_TYPE_NONE
    lbl.Text = Text
    lbl.TextSize = 16
    lbl.TextColor = Colors.Black
    lbl.SingleLine = False

    p.AddView(chk, 0, (Height-30dip)/2, 30dip, 30dip) 'view #0
    p.AddView(lbl, chk.Width, 2dip, Width - chk.Width, Height) 'view #1
    Return p
End Sub

And build:

B4X:

cv.Clear
For i = 0 To l.Size - 1
    Dim p As Panel = CreateListItem(L.Get(i), cv.AsView.Width, 60dip)
    Dim lbl As EditText = p.GetView(1)
    Dim texth As Int = su.MeasureMultilineTextHeight(lbl, l.Get(i)) + 75
    texth = Max(40dip, texth)
    lbl.Height = texth
    cv.Add(p, texth + 10dip, l.Get(i))
    If (i mod 100) = 0 Then DoEvents
Next

And use:

B4X:

Sub lbl_FocusChanged (HasFocus As Boolean)
Try
    Dim index As Int = cv.GetItemFromView(Sender)
    Dim pnl As Panel = cv.GetPanel(index)
    Dim chk As CheckBox = pnl.GetView(0)
    Dim lbl As EditText = pnl.GetView(1)
    If HasFocus Then
        If chk.Checked Then
            chk.Checked = False
        Else
            chk.Checked = True
        End If
        atxtSearch.RequestFocus
    End If
Catch
End Try
End Sub

And somtimes this error occurs during
Dim lbl As EditText = pnl.GetView(1)

So, now only Try helps :-(

LucaMs · Sep 11, 2015

Where is the code to add the CustomListView?

(lbl can be a name for a label. edt should be better )

CustomListView - A flexible list based on ScrollView

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