[Solved] why use menu.findItem() and not findViewByID alone?

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The difference is that the second line refers to menu to find its item and the first finds view in activity layout

Doc for the first line: https://developer.android.com/reference/android/app/Activity.html#findViewById(int)

Doc for the second line:
https://developer.android.com/reference/android/view/Menu.html#findItem(int)

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solved why use menu.findItem() and not findViewByID alone?