It's easy to navigate from a file in a view to an editor showing the file. Just double-click the file in the view. However, what if you want to go backward; from the editor showing a file to the view showing that file?
Select Navigate Show In, and select the view you want from those that appear in the submenu.
For example, if you're editing a Java file, select Navigate Show In, and the Package Explorer will open . The file you're currently editing will be selected.