All these windows on a single screen are managed by WindowManager. The navigation bar also has a different window where it draws the back button, the home button etc. The status bar is given a window where the system draws things like time, battery, notification icons etc. The activity is given a window where it draws the view hierarchy specified by us. Each of these components are given a window to draw themselves into. Each of these components have a different window. What is a Window? When you open any standard app, you would see a status bar, a navigation bar, and the actual activity.
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