what is window manager in android
The Android WindowManager is a system service, which is responsible for managing the z-ordered list of windows, which windows are visible, and how they are laid out on screen.mong other things, it automatically performs window transitions and animations when opening or closing an app or rotating the screen. Every activity has a Window that is used to display its content on the screen. When you call setContentView on an activity, it attaches that view to the activity's default window.