How do you do overlays on Android?
How to draw Screen Overlay
- First of all, Create a LayoutParams variable to define the overlay type, width, height, flags, etc.
- Now we need a layout that will be inflated on the device window.
- And now, you need to add this view on the screen using the WindowManager class.
What is window overlay?
Provides a window which can have an arbitrary number of overlay views that will sit above the root view of the window. Overlays will be the full size of the screen, and will be rotated as appropriate based on device orientation.
What is System_alert_window?
A flutter plugin to show Truecaller like overlay window, over all other apps along with callback events. Android Go or Android 11 & above, this plugin shows notification bubble, in other android versions, it shows an overlay window.
What is WindowManager 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. Among other things, it automatically performs window transitions and animations when opening or closing an app or rotating the screen.