ViewPager嵌套Fragment

ViewPager嵌套Fragment

1. 新建4个Fragment；

2. 新建ViewPagerAdapter继承FragmentPagerAdapter;
   public class ViewpagerAdapter extends FragmentPagerAdapter {

   private ArrayList arrayList;

   public ViewpagerAdapter(@NonNull FragmentManager fm,ArrayList arrayList) {
   super(fm);
   this.arrayList=arrayList;
   }

   @NonNull
   @Override
   public Fragment getItem(int position) {
   return arrayList.get(position);
   }

   @Override
   public int getCount() {
   return arrayList.size();
   }
   }

3. 在MainActivity中为ViewPager绑定适配器；

   arrayList=new ArrayList<>();
       arrayList.add(new Fragment1());
       arrayList.add(new Fragment2());
       arrayList.add(new Fragment3());
       arrayList.add(new Fragment4());
       viewpagerAdapter= new ViewpagerAdapter(getSupportFragmentManager(),arrayList);
       viewpager.setAdapter(viewpagerAdapter);