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Get method documentation [Android Documentation]
Return the current drawable used as the navigation icon.
Set method documentation [Android Documentation]
Set the icon to use for the toolbar's navigation button.
The navigation button appears at the start of the toolbar if present. Setting an icon will make the navigation button visible.
If you use a navigation icon you should also set a description for its action using Toolbar.SetNavigationContentDescription(int). This is used for accessibility and tooltips.