//统一的Fragment构建方法
  public static MerchandiseListBaseFragment newInstance(int flag) {
    Bundle args = new Bundle();
    //type代表页签，0：全部订单 1：待发货 2：待收货 3：已完成
    args.putString("type", String.valueOf(flag));
    MerchandiseListBaseFragment fragment = new MerchandiseListBaseFragment();
    fragment.setArguments(args);
    return fragment;
  }

  /**
   * 初始化ViewPager
   */
  private void initViewPager() {
    final ArrayList<Fragment> fragmentList = new ArrayList<>();
    MerchandiseListBaseFragment merchandiseListAll = MerchandiseListBaseFragment.
        newInstance(0);
    MerchandiseListBaseFragment merchandiseListDisPatch = MerchandiseListBaseFragment.
        newInstance(1);
    MerchandiseListBaseFragment merchandiseListReceive = MerchandiseListBaseFragment.
        newInstance(2);
    MerchandiseListBaseFragment merchandiseListFinish = MerchandiseListBaseFragment.
        newInstance(3);
    MerchandiseListBaseFragment.firstGetData();//初始化数据

    //持有fragment对象List
    fragmentList.add(merchandiseListAll);
    fragmentList.add(merchandiseListDisPatch);
    fragmentList.add(merchandiseListReceive);
    fragmentList.add(merchandiseListFinish);

    FragmentPagerAdapter fragmentAdapter = new BaseFragmentAdapter(getSupportFragmentManager(), fragmentList, mTitles);
    viewPager.setAdapter(fragmentAdapter);
    viewPager.setCurrentItem(0);
    viewPager.setOffscreenPageLimit(4);
    viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {

      @Override
      public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
      }

      @Override
      public void onPageSelected(int position) {
        tabLayout.getTabAt(position).select();
      }

      @Override
      public void onPageScrollStateChanged(int state) {
      }
    });
    tabLayout.setupWithViewPager(viewPager);//将tabLayout和ViewPager绑定
    tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
      @Override
      public void onTabSelected(TabLayout.Tab tab) {
        viewPager.setCurrentItem(tab.getPosition());
      }

      @Override
      public void onTabUnselected(TabLayout.Tab tab) {
      }

      @Override
      public void onTabReselected(TabLayout.Tab tab) {
      }
    });
  }

  /**
   * MVP绑定
   */
  @Override
  public void attachPre() {
    activity = this;
    // mContext = this;
    mPresenter = TUtil.getT(this, ID_PRESENTER);
    mModel = TUtil.getT(this, ID_MODEL);
    if (mPresenter != null) {
      mPresenter.mContext = this;
    }
    initPresenter();
  }

 public static <T> T getT(Object o, int i) {
    try {
      return ((Class<T>) ((ParameterizedType) (o.getClass()
          .getGenericSuperclass())).getActualTypeArguments()[i])
          .newInstance();
    } catch (InstantiationException e) {
      e.printStackTrace();
    } catch (IllegalAccessException e) {
      e.printStackTrace();
    } catch (ClassCastException e) {
      e.printStackTrace();
    }
    return null;
  }