多片Android后如何触发Back Button返回主屏

@Override
public void onBackPressed() {
    Intent intent = new Intent(this, MainActivity.class);
    intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
    startActivity(intent);
    finish();
}

public class MyFragment extends Fragment {
    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        requireActivity().getOnBackPressedDispatcher().addCallback(getViewLifecycleOwner(), new OnBackPressedCallback(true) {
            @Override
            public void handleOnBackPressed() {
                // 处理返回逻辑
                if (shouldReturnToHome()) {
                    navigateToHome();
                } else {
                    setEnabled(false); // 禁用回调，让Activity处理返回事件
                }
            }
        });
    }

    private boolean shouldReturnToHome() {
        // 判断是否应该返回主屏
        return true;
    }

    private void navigateToHome() {
        Intent intent = new Intent(requireActivity(), MainActivity.class);
        intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
        requireActivity().startActivity(intent);
        requireActivity().finish();
    }
}