Android Question [solved] BBCodeView on draggable Panel throws error

fredo

Well-Known Member
Licensed User
The BBCodeview allows to display texts in a variety of ways. Since it also contains a scrollview, it is ideal for displaying longer texts even in a small area.

In this case BBCodeViews should be used on several windows, which can be dragged around.

2020-12-08_18-03-17.png

When trying to assign a text to BBCodeview, the following error always appears:
errormessage:
Error occurred on line: 192 (BBCodeView)
java.lang.NullPointerException: Attempt to invoke virtual method 'anywheresoftware.b4a.objects.collections.List b4a.example.bbcodeparser._parse(b4a.example.bbcodeparser, b4a.example.bbcodeparser$_bbcodeparsedata)' on a null object reference
    at b4a.example.bbcodeview._parseanddraw(bbcodeview.java:136)
    at b4a.example.bbcodeview._settext(bbcodeview.java:72)
    at b4a.example.b4xmainpage._createinfowindow(b4xmainpage.java:198)
    at b4a.example.b4xmainpage._showinfo(b4xmainpage.java:99)
    at b4a.example.b4xmainpage._button1_click(b4xmainpage.java:79)
    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:351)
    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.raiseEvent(BA.java:193)
    at anywheresoftware.b4a.objects.ViewWrapper$1.onClick(ViewWrapper.java:80)
    at android.view.View.performClick(View.java:7161)
    at android.view.View.performClickInternal(View.java:7133)
    at android.view.View.access$3500(View.java:804)
    at android.view.View$PerformClick.run(View.java:27416)
    at android.os.Handler.handleCallback(Handler.java:883)
    at android.os.Handler.dispatchMessage(Handler.java:100)
    at android.os.Looper.loop(Looper.java:241)
    at android.app.ActivityThread.main(ActivityThread.java:7617)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:941)

B4X:
Sub Class_Globals
    Private Root As B4XView
    Private xui As XUI

    Private InfoWindowList As List

    Private TextEngine As BCTextEngine
    Private BBCodeView1 As BBCodeView
    
    Private Action1 As B4XView
    Private InfoWinPanel As B4XView
    Private Label1 As B4XView
End Sub

Public Sub Initialize
    
End Sub

Private Sub B4XPage_Created (Root1 As B4XView)
    Root = Root1
    Root.LoadLayout("MainPage")
    
    TextEngine.Initialize(Root)
    InfoWindowList.Initialize
End Sub


Sub Button1_Click
    ShowInfo(1, "aaaa [b]Testtext[/b] aaaa aaa.")
End Sub

Sub Button2_Click
    ShowInfo(2, "bbb [b]AnotherText[/b] bbbb bbb.")
End Sub


Sub ShowInfo(Index As Int, Text1 As String )
    If Index > InfoWindowList.size Then
        Dim vx As B4XView = CreateInfoWindow(Index, "Window #" & Index, Text1, 300dip, 200dip)
        Root.AddView(vx, 10dip, 10dip, vx.Width, vx.Height)
        
        Private dvP As dragview
        dvP.Initialize(Root, vx)
        
        InfoWindowList.Add(vx)
    Else
        Dim vx As B4XView = InfoWindowList.get(Index -1)
        vx.Visible = True
    End If   
End Sub

Sub CreateInfoWindow(Index As Int, Title As String, Text As String, ItemHeight As Int, ItemWidth As Int) As B4XView
    Dim p As B4XView = xui.CreatePanel("")
    p.SetLayoutAnimated(0, 0, 0, ItemWidth, ItemHeight)
    p.LoadLayout("infowindow")
    Label1.Text = Title
    Action1.Tag =Index
    
    BBCodeView1.Text = Text
    
    Return p
End Sub

Sub DvPanel_Action_Click
    Dim vc As B4XView = Sender
    Dim vx As B4XView = InfoWindowList.get(vc.Tag -1)
    vx.Visible = False
End Sub


Somehow the TextEngine must be connected to BBCodeview after Loadlayout().
But how?



[Small Testproject attached]
 

Attachments

  • BBCodewievOnDraggables.zip
    12.3 KB · Views: 37

Mahares

Expert
Licensed User
Somehow the TextEngine must be connected to BBCodeview after Loadlayout().
But how?
Hi fredo:
Here is what I did to make it work. If you want I can export the project:
1. Remove or comment this line: TextEngine.Initialize(Root)
2. I modified the below sub like this:
B4X:
Sub CreateInfoWindow(Index As Int, Title As String, Text As String, ItemHeight As Int, ItemWidth As Int) As B4XView
    Dim p As B4XView = xui.CreatePanel("")
    p.SetLayoutAnimated(0, 0, 0, ItemWidth, ItemHeight)
    p.LoadLayout("infowindow")
    Label1.Text = Title
    Action1.Tag =Index    
    TextEngine.Initialize(p)    'put this here
    BBCodeView1.Text = Text
    Return p
End Sub
 
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