ViewPager嵌套Fragment

ViewPager嵌套Fragment

1. 新建4個Fragment；

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

   private ArrayList<Fragment> arrayList;
   
       public ViewpagerAdapter(@NonNull FragmentManager fm,ArrayList<Fragment> 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中爲ViewPager綁定適配器；

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);