Android Question immersive mode crush

[yaniv hanya]

Hi
I use the immersiveMode (from thi tut)
After a few minutes of running, it crashes. I get this log

Spoiler

** Activity (main) Create, isFirst = true **
** Activity (main) Resume **
** Activity (main) Pause, UserClosed = false **
Error occurred on line: 152 (Main)
java.lang.NullPointerException: Attempt to read from field 'anywheresoftware.b4a.BA b4a.example.main.activityBA' on a null object reference
at b4a.example.main._activity_windowfocuschanged(main.java:515)
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 b4a.example.main.onWindowFocusChanged(main.java:185)
at com.android.internal.policy.DecorView.onWindowFocusChanged(DecorView.java:1451)
at android.view.View.dispatchWindowFocusChanged(View.java:10307)
at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:1217)
at android.view.ViewRootImpl$ViewRootHandler.handleMessage(ViewRootImpl.java:4018)
at android.os.Handler.dispatchMessage(Handler.java:110)
at android.os.Looper.loop(Looper.java:203)
at android.app.ActivityThread.main(ActivityThread.java:6251)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1063)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:924)

linr 152 is the Activity_WindowFocusChanged event

Sub Activity_WindowFocusChanged(HasFocus As Boolean) ' - line 152
    If HasFocus Then
        Try
            Dim jo As JavaObject = Activity
            Sleep(300)
            jo.RunMethod("setSystemUiVisibility", Array As Object(5894)) '3846 - non-sticky
        Catch
            'Log(LastException) 'This can cause another error
        End Try 'ignore       
    End If
End Sub

Do you have an idea why?

 

[Erel]

Immersive Mode - hide the navigation bar

Immersive mode means full screen mode where the navigation bar is also hidden. The user can bring back the bars by swiping near the edges. The required steps are: 1. Call setSystemUiVisibility with the immersive flags. This is done in Activity_WindowFocusChanged. 2. Get the full display size...

www.b4x.com

This error will only happen in debug mode. It is related to the event being raised when a breakpoint is reached.

 

[yaniv hanya]

OK. Thank you very much.
When is the event usually raised?

 

[Erel]

In debug mode it is raised when the program is paused.

This event is mainly raised when you show a dialog with MsgboxAsync.