FragmentA fragment = FragmentA.newInstant(null);
getSupportFragmentManager().beginTransaction().add(R.id.f_tab_fragment,fragment).commit(); 

     <FrameLayout
        android:id="@+id/fl_container"
        android:layout_width="match_parent"
        android:layout_above="@+id/f_tab_fragment"
        android:layout_height="match_parent"/>

      <FrameLayout
        android:id="@+id/f_tab_fragment"
        android:layout_width="match_parent"
        android:layout_height="52dp"
        android:layout_alignParentBottom="true"/> 

 public class FragmentA extends BaseFragment {

  private static final String TAB_HOME = com.timediffproject.module.home.MyMainFragment.class.getName();

  private static final String TAB_TEST = com.timediffproject.module.home.TestFragment.class.getName();

  private BaseFragment mLastShowFragment;

  private static TabFragment fragment;

  public static TabFragment newInstant(Bundle bundle){
    if (fragment == null){
      fragment = new TabFragment();
      fragment.setArguments(bundle);
    }
    return fragment;
  }

  @Override
  public void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    initTabInfo();

  }

  private void initTabInfo(){
    FragmentManager fm = getFragmentManager();
    if (fm == null){
      return;
    }
    FragmentTransaction ft = fm.beginTransaction();

    BaseFragment home = (BaseFragment) fm.findFragmentByTag(TAB_HOME);
    if (home != null){
      ft.hide(home);
    }

    BaseFragment test = (BaseFragment) fm.findFragmentByTag(TAB_TEST);
    if (test != null){
      ft.hide(test);
    }

    ft.commit();

  }

  @Nullable
  @Override
  public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState) {
    return inflater.inflate(R.layout.fragment_tab,container,false);
  }

  @Override
  public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    view.findViewById(R.id.btn_change_home).setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View view) {
        switchTo(TAB_HOME,null);
      }
    });
    view.findViewById(R.id.btn_change_test).setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View view) {
        switchTo(TAB_TEST,null);
      }
    });
    switchTo(TAB_HOME,null);
  }

  //切换Fragment的方式（FragmentB、FragmentC）
  //tab为Fragment的类名（如：FragmentB.class.getName()）
  //R.id.fl_container是在Activity的布局里，不是在FragmentA的布局里
  private void switchTo(String tab, Bundle bundle){

    //初始化管理Fragment的类
    FragmentManager fm = getFragmentManager();
    if (fm == null){
      return;
    }
    FragmentTransaction ft = fm.beginTransaction();

    //从FragmentManager里寻找类名为tab的Fragment
    BaseFragment fragment = (BaseFragment)fm.findFragmentByTag(tab);
    if (fragment == null){
      fragment = (BaseFragment) Fragment.instantiate(getActivity(),tab);
      fragment.setArguments(bundle);
      ft.add(R.id.fl_container,fragment,tab);
    }else{
      ft.show(fragment);
    }
    //隐藏现在正显示的Fragment
    if (mLastShowFragment != null) {
      ft.hide(mLastShowFragment);
    }
    //记录最后点击的Fragment
    mLastShowFragment = fragment;

    ft.commitAllowingStateLoss();

  }
} 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="horizontal" android:layout_width="match_parent"
  android:layout_height="52dp">

  <Button
    android:id="@+id/btn_change_home"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="切换home"
    />

  <Button
    android:id="@+id/btn_change_test"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="切换test"
    />

</LinearLayout> 

public class TestFragment extends BaseFragment {

  @Nullable
  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {return inflater.inflate(R.layout.fragment_test,container,false);
  }

  @Override
  public void onViewCreated(View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
  }

} 

@Nullable
  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    //这里正确的写法是:
    //return inflater.inflate(R.layout.fragment_test,container,false);
    return inflater.inflate(R.layout.fragment_test,container);
   }