使用绑定从片段访问父活动的UI元素

public class MainActivity extends AppCompatActivity {
    private ActivityMainBinding binding;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        binding = ActivityMainBinding.inflate(getLayoutInflater());
        setContentView(binding.getRoot());

        if (savedInstanceState == null) {
            getSupportFragmentManager().beginTransaction()
                .replace(R.id.container, new MainFragment())
                .commit();
        }
    }

    public ActivityMainBinding getBinding() {
        return binding;
    }
}

public class MainFragment extends Fragment {
    private ActivityMainBinding activityBinding;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        activityBinding = ((MainActivity) requireActivity()).getBinding();
        View view = inflater.inflate(R.layout.fragment_main, container, false);

        activityBinding.button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // 处理按钮点击事件
            }
        });

        return view;
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        activityBinding = null;
    }
}