Android Question problem with some customview when getview

Hi

i use this library that have a customview:
https://www.b4x.com/android/forum/threads/arrowdownloadbutton.58720/#content

and when i get this view from a panel with getview() , i cant do anything on view , like when view not initialized!

and i have this problem with some others customview library.

project code:
B4X:
Sub Activity_Create(FirstTime As Boolean)
    Activity.Color=Colors.Gray
    
    Dim cls As ColorDrawable
    cls.Initialize(Colors.White,15dip)
    
    For i = 1 To 5
        Dim pnl As Panel
        pnl.Initialize("pnl")
        pnl.Background=cls
        Activity.AddView(pnl,10dip,(i*80dip),100%x-20dip,70dip)
        Dim adb1 As ArrowDownloadButton
        adb1.Initialize("adb")
        adb1.RingColor = Colors.Blue
        adb1.ProgressColor = Colors.yellow
        adb1.ProgressTextColor = Colors.white
        adb1.ArcWidth = 30
        adb1.ProgressTextSize = 60
        pnl.AddView(adb1,0,0,0,0)
        adb1.Height=60dip
        adb1.Width=adb1.Height
        adb1.Left=(pnl.Width-adb1.Width)/2
        adb1.Top=5dip
        If i = 3 Then
            adb1.startAnimating 'it works
        End If
    Next
End Sub

Sub pnl_Click
    Dim panel As Panel
    panel=Sender
    Dim adb2 As ArrowDownloadButton
    adb2=panel.GetView(0)
    adb2.startAnimating 'it not works
    adb2.Top=0 'it not works
End Sub
Log when pnl_Click:
B4X:
Error occurred on line: 64 (Main)
java.lang.NullPointerException: Attempt to invoke virtual method 'void main.java.com.fenjuly.library.ArrowDownloadButton.startAnimating()' on a null object reference
    at arrowdownloadbuttonwrapper.arrowDownloadButtonWrapper.startAnimating(arrowDownloadButtonWrapper.java:175)
    at java.lang.reflect.Method.invoke(Native Method)
    at anywheresoftware.b4a.shell.Shell.runVoidMethod(Shell.java:777)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:354)
    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:197)
    at anywheresoftware.b4a.BA.raiseEvent(BA.java:193)
    at anywheresoftware.b4a.objects.ViewWrapper$1.onClick(ViewWrapper.java:80)
    at android.view.View.performClick(View.java:5637)
    at android.view.View$PerformClick.run(View.java:22429)
    at android.os.Handler.handleCallback(Handler.java:751)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:154)
    at android.app.ActivityThread.main(ActivityThread.java:6131)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:892)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:782)
and sometime i get this error when compile:
B4X:
Generating R file.    (0.00s)
Compiling generated Java code.    Error
B4A line: 63
adb2=panel.GetView(0)
javac 1.8.0_162
src\b4a\example\main.java:431: error: cannot find symbol
_adb2 = (arrowdownloadbuttonwrapper.arrowDownloadButtonWrapper) anywheresoftware.b4a.AbsObjectWrapper.ConvertToWrapper(new arrowdownloadbuttonwrapper.arrowDownloadButtonWrapper(), (main.java.com.fenjuly.library.ArrowDownloadButton)(_panel.GetView((int) (0)).getObject()));
                                                                                                                                                                                         ^
  symbol:   class java
  location: class main
please help me how i can solve this, Thanks.

Also i attached project and picture.

2020-11-01_124043.jpg
 

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