How to invoke importwizard from eclipse plugin programmatically - eclipse

Question

I need to invoke eclipse importwizard from the eclipse plugin project programmatically. i follow the example from , seems not work
https://resheim.net/2010/07/invoking-eclipse-wizard.html
then in my code , it shows wizards array is empty, do i need to register importwizard ? and how?
IWizardDescriptor[] wizards= PlatformUI.getWorkbench().getImportWizardRegistry().getPrimaryWizards();

Answer 1

The import dialog doesn't use 'primary' wizards. You need to know the id of the wizard you want to use and call the wizard registry findWizard method.
The Import Projects wizard id is org.eclipse.ui.wizards.import.ExternalProject so the code would look like:
String id = "org.eclipse.ui.wizards.import.ExternalProject"
IWizardDescriptor descriptor = PlatformUI.getWorkbench().getImportWizardRegistry().findWizard(id);
IWizard wizard = descriptor.createWizard();
WizardDialog wd = new WizardDialog(display.getActiveShell(), wizard);
wd.setTitle(wizard.getWindowTitle());
wd.open();

Answer 2

private void openProject(String projectfolder) throws CoreException {
//TODO: check if project is already created and open, if yes do nothing or just refresh
IProjectDescription description = null;
IProject project = null;
description = ResourcesPlugin.getWorkspace().loadProjectDescription(
new Path(new File(projectfolder).getAbsolutePath()
+ "/.project"));
project = ResourcesPlugin.getWorkspace().getRoot()
.getProject(description.getName());
project.create(description, null);
project.open(null);
}