如何从activity onCreate方法中调用片段

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // 获取容器的ID
        int containerId = R.id.fragment_container;

        // 创建片段实例
        Fragment fragment = new YourFragment();

        // 开始事务
        FragmentManager fragmentManager = getSupportFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();

        // 替换容器中的片段
        fragmentTransaction.replace(containerId, fragment);

        // 提交事务
        fragmentTransaction.commit();
    }
}