Android Question CLV with floating titles: Trying to get index of clicked title item

toby · Apr 21, 2020

My test app is based on the following example:

[XUI] CustomListView with floating titles

Title items are added to the list. A Panel is set above the list. The panel shows the current title when the top visible item is not a title item. It works by checking for the top item type. If it is a title item then the panel is hidden, otherwise the panel is shown with the current title...

www.b4x.com

What I'm trying to achieve: When a title item is clicked, I want to get the title item index . For example, if I click title item "Title #BBB", I want to find out its index which is 11.

I added the following code to get the index of the clicked title item, which works most of the time.

B4X:

Sub lblTitle_Click
    Dim index As Int = CLV1.GetItemFromView(Sender)
    LogColor("clicked title item index=" & index, Colors.Green)
End Sub

When the first title, Ttitle #AAA, is clicked, the app crashes. Below is the log

entering lblTitle_Click
Error occurred on line: 420 (CustomListView)
java.lang.ClassCastException: android.view.ViewRootImpl cannot be cast to android.view.View
at anywheresoftware.b4a.objects.B4XViewWrapper.asViewWrapper(B4XViewWrapper.java:70)
at anywheresoftware.b4a.objects.B4XViewWrapper.getParent(B4XViewWrapper.java:167)
at b4a.example3.customlistview._getitemfromview(customlistview.java:768)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:732)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:348)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:255)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:144)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:180)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:176)
at anywheresoftware.b4a.objects.ViewWrapper$1.onClick(ViewWrapper.java:80)
at android.view.View.performClick(View.java:5656)
at android.view.View$PerformClick.run(View.java:22462)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:159)
at android.app.ActivityThread.main(ActivityThread.java:6146)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
** Activity (main) Pause, UserClosed = true **
*** Service (starter) Create ***
** Service (starter) Start **
** Activity (main) Create, isFirst = true **
** Activity (main) Resume **

Test app attached. I don't know how to fix the error. Any helps would be appreciated greatly.

toby

Erel · Apr 21, 2020

Remove CustomListView module and add the xCustomListView library: https://www.b4x.com/android/forum/threads/xui-customlistview-with-floating-titles.87935/#post-556398

You cannot use GetItemFromView as the panel is not part of CLV.

B4X:

Sub pnlTitle_Click
    Dim title As String = pnlTitle.GetView(0).Text
    Log(title)
End Sub

toby · Apr 21, 2020

I downloaded the updated example and added the given pnlTitle_Click() event code. Below are my test results:
1. Clicking "Title #AAA" always works, which is very good.
2. When two or more title items are shown, only the top one has effect.

I would like to know which of any visible titles is clicked, whether or not they're at the top position.

Erel · Apr 21, 2020

You need to handle the CLV_ItemClick event for the non-floating titles.

toby · Apr 21, 2020

It's only the floating titles I'm having problems with. I need to know which floating title has been clicked.

toby · Apr 21, 2020

I've found a way to deal with the issue. Inside the CLV_ItemClick event, I look for title items as shown below.

B4X:

    If CLV1.GetValue(Index) Is TitleData Then
        Dim td As TitleData = CLV1.GetValue(Index)
        'pnlTitle.GetView(0).Text = td.Title
        LogColor("td.title=" & td.Title, Colors.Green)
    Else
        LogColor("CLV1.GetValue(index)=" & CLV1.GetValue(Index) , Colors.Green)
    End If

That means I have to handle first floating title differently from the rest of them. Am I doing it correctly or there is a better way?

Erel · Apr 21, 2020

Looks correct. Note that Value is passed as a parameter to ItemClick.

Android Question CLV with floating titles: Trying to get index of clicked title item

toby

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[XUI] CustomListView with floating titles

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