Android status bar is the default grey bar with 3-4 button (back, home, recent, menu).
You can use the status bar or not with Livecode, let's see how to interact with it. First of all, you can choose to display or not the status bar with your app in the Standalone application settings.
If you don't want to show the status bar, please remember to add at least close this stack button in order to close your app. Many programmers prefer to not show the status bar and create a personal one in their app.
If you decide to show it, you may interact with the back button (the go back arrow button) and with the menu button (the three dots button).
The message to interact with the go back button is with the backKey, example:
on backKey answer "You pressed the back key" end backKey
The message to interact with the go menu button is with the menuKey, example:
on menuKey answer "You pressed the menu key" end menuKey
The message to interact with the search menu button is with the searchkey, example:
on SearchKey answer "You pressed the menu key" end searchKey