Flutter bottom sheet dialog is placed above to keyboard

bottomsheetdialog_placing

To have the AddTaskScreen sit just above the keyboard, you can wrap it inside a SingleChildScrollView, which determines the padding at the bottom using a MediaQuery.

showModalBottomSheet.dart

onPressed: () {
  showModalBottomSheet(
    context: context,
    isScrollControlled: true,
    builder: (context) => SingleChildScrollView(
      child:Container(
        padding: EdgeInsets.only(bottom: MediaQuery.of(context).viewInsets.bottom),
        child: AddTaskScreen(),
      )
    )
  );
}