back only screen flutter code example

Example 1: flutter push route

// Within the `FirstRoute` widget
onPressed: () {
  Navigator.push(
    context,
    MaterialPageRoute(builder: (context) => SecondRoute()),
  );
}

Example 2: pop and push shows black screen which needs to be pressed back flutter

Navigator.pop(context);
Navigator.push(
            context,
            MaterialPageRoute(builder: (context) => SecondActivity()),
          );