Variable ActivityState`Const`

ActivityState: {
    ACTIVE: 2;
    BACKGROUND: 0;
    FOREGROUND: 1;
} = ...

ReadonlyACTIVE: 2
An activity is in the foreground and user can interact with it.
ReadonlyBACKGROUND: 0
An activity is in the background and not visible to the user.
ReadonlyFOREGROUND: 1
An activity is in the foreground, and it is visible to the user, but doesn't have focus (for example, covered by a dialog).

Variable ActivityStateConst