Dynamically changing file icon in project view

Hi I am a beginner to plugin development. Can someone please explain me in simple steps how to dynamically change an icon of a file in project view.

As an example I want to change the icon of the file I am currenlty working on. When I move to another file ,new file's icon should be changed and the previous file's icon should be set to default.

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You can implement the IconProvider interface and register your implementation as the <iconProvider> extension point. For Java files in the project view, your provider will receive an instance of PsiClass representing the top-level class contained in each file.

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