import org.eclipse.jdt.internal.ui.packageview.PackageExplorerContentProvider; //导入依赖的package包/类
public void init(ICommonContentExtensionSite commonContentExtensionSite) {
	fStateModel = commonContentExtensionSite.getExtensionStateModel();
	fContentProvider = (PackageExplorerContentProvider) commonContentExtensionSite.getExtension().getContentProvider();
	delegeteLabelProvider = createLabelProvider();

	delegeteLabelProvider.setIsFlatLayout(fStateModel
			.getBooleanProperty(Values.IS_LAYOUT_FLAT));
	fLayoutPropertyListener = new IPropertyChangeListener() {
		public void propertyChange(PropertyChangeEvent event) {
			if (Values.IS_LAYOUT_FLAT.equals(event.getProperty())) {
				if (event.getNewValue() != null) {
					boolean newValue = ((Boolean) event.getNewValue())
							.booleanValue() ? true : false;
					delegeteLabelProvider.setIsFlatLayout(newValue);
				}
			}

		}
	};
	fStateModel.addPropertyChangeListener(fLayoutPropertyListener);
}