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我正在尝试用另一个片段替换我的选项卡式滑动视图中的片段视图，但它不会替换或添加片段，而是仅在所有选项卡式活动中添加片段的菜单。

我希望在我的滑动视图中的特定选项卡活动中，我可以用另一个片段（FragmentBoy）替换内容（片段A），它可以覆盖该特定选项卡式活动的特定菜单。在用另一个片段（FragmentGirl）替换内容（片段B）时也可以工作。

请我卡住了，我需要帮助-

public class Main2Activity extends AppCompatActivity {
private ViewPager mViewPager;
private int[] tabIcons = {
        R.drawable.ic_grand,
        R.drawable.ic_event,     
};
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main2);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    mViewPager = (ViewPager) findViewById(R.id.container);
    setupViewPager(mViewPager);
    TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
    tabLayout.setupWithViewPager(mViewPager);
    setupTabIcons();
}
private void setupTabIcons() {
    TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
    tabLayout.getTabAt(0).setIcon(tabIcons[0]);
    tabLayout.getTabAt(1).setIcon(tabIcons[1]);
}
private void setupViewPager(ViewPager mViewPager) {
    ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
    adapter.addFrag(new FragmentA(), "ONE");
    adapter.addFrag(new FragmentB(), "TWO");    
    mViewPager.setAdapter(adapter);
}

class ViewPagerAdapter extends FragmentPagerAdapter {
    private final List<Fragment> mFragmentList = new ArrayList<>();
    private final List<String> mFragmentTitleList = new ArrayList<>();
    public ViewPagerAdapter(FragmentManager manager) {
        super(manager);
    }
    @Override
    public Fragment getItem(int position) {
        return mFragmentList.get(position);
    }
    @Override
    public int getCount() {
        return mFragmentList.size();
    }
    public void addFrag(Fragment fragment, String title) {
        mFragmentList.add(fragment);
        mFragmentTitleList.add(title);
    }
    @Override
    public CharSequence getPageTitle(int position) {
        return null;
    }
}
public static class FragmentA extends Fragment {
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view=inflater.inflate(R.layout.grand,container,false);
        Button tb=(Button)view.findViewById(R.id.btn_c);
        tb.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                FragmentManager manager = getFragmentManager();
                FragmentTransaction transaction = manager.beginTransaction().add(R.id.swapfrag, new BOYFragment());
                transaction.commit();
            }
        });
        return view;
    }
}
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