Get Selected File names from ProjectViewPane and add Action Group

Hi, I am trying to add an actionGroup in the projectViewPane menu displayed when user right clicks on a file. I want to display this group if the user clicks on project directory or .java files only. Below is the code that I am using.

The problem is that I cannot directly check from UI thread and using invoke later always returns empty actionGroup as the boolean value does not change. How do I wait till the invokeLater() is executed?

class RequiredActionGroup : ActionGroup(), DumbAware {
    override fun getChildren(event: AnActionEvent?): Array<AnAction> {
        
        val project = event!!.project

        //Project Directory Path
        val projectDirectory = project!!.basePath
        println("ProjectDirectory: $projectDirectory")

        //Array returning actions
        var actionGroup: Array<AnAction> = arrayOf()

        //Boolean Indicating whether to show action group or not
        var toShow = false

        //Boolean Indicating whether projectDirectory was selected or not
        var isProjectDirectorySelected = false

        //Getting user selected elements from ProjectViewPane
        var selectedUserObjects: Array<out Any?>?
        var selectedElements: Array<out Any>?

        val getSelectedElementsRunnable = Runnable {
            selectedUserObjects = ProjectView.getInstance(project).currentProjectViewPane.selectedUserObjects
            selectedElements = ProjectView.getInstance(project).currentProjectViewPane.getSelectedValues(
                selectedUserObjects!!)
            println("Inside Runnable")

            if(selectedElements!=null){
                for(element in selectedElements!!){
                    if(element.javaClass == PsiClassImpl::class.java){
                        val selectedElement: PsiClassImpl = element as PsiClassImpl
                        println(selectedElement.containingFile.virtualFile.canonicalPath)
                        toShow = true
                    }else if(element.javaClass == PsiJavaDirectoryImpl::class.java){
                        val selectedElement: PsiJavaDirectoryImpl = element as PsiJavaDirectoryImpl

                        if(selectedElement.virtualFile.canonicalPath == projectDirectory){
                            isProjectDirectorySelected = true
                            toShow = true
                        }
                    }
                }
            }
        }



        ApplicationManager.getApplication().invokeLater(getSelectedElementsRunnable)

        if(toShow){
            actionGroup= arrayOf(
            RunAnalysisAction("Run Analysis",
                "Run Analysis on this project",
                AllIcons.Actions.Execute)
            )
        }

        return actionGroup

    }
}