viewPager.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager()) {
      @Override
      public Fragment getItem(int position) {
        switch(position){
        case 0:
        fragments=new Fragmnet01();
        break;
          case 1:
        fragments=new Fragmnet02();
        break;
        .....
      }
        return fragments;
      }
      @Override
      public int getCount() {
        return listTabs.size();
      }
    });

//定义一个对象数组并给定长度
 fragments=new MyFragment[listTabs.size()];
    viewPager.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager()) {
      @Override
      public Fragment getItem(int position) 
      {
      //在这里判断如果Fragmnet[position]当前页面没有加载的话我们再次在上面加载
        if(fragments[position]==null){
          //这里只是写一个构造方法把值传到fragment里面
          MyFragment my = MyFragment.getInstance(listTabs.get(position).getId());
          fragments[position]=my;
        }
        return fragments[position];
      }
      @Override
      public int getCount() {
        return listTabs.size();
      }
    });

 public static MyFragment getInstance(int id){
    MyFragment myFragment=new MyFragment();
    Bundle bundle=new Bundle();
    bundle.putInt("id",id);
    myFragment.setArguments(bundle);
    return myFragment;
  }