ViewPager Fragment dynamic refresh

There is always a problem with the dynamic deletion and refresh of fragments when you start to use it

. Then I asked for advice 

PagerAdapter的 notifyDataSetChanged（） 需要继承 FragmentStatePagerAdapter 才可以

Also need to override the getItemPosition method

 

PagerAdapter

 public class TabFragmentPagerAdapter extends FragmentStatePagerAdapter {

        private FragmentManager mfragmentManager;


        public TabFragmentPagerAdapter(FragmentManager fm) {
            super(fm);
        }

//
        @Override
        public int getItemPosition(@NonNull Object object) {
            return PagerAdapter.POSITION_NONE;
        }

        @Override

        public Fragment getItem(int arg0) {
            return list_fragment.get(arg0);//显示第几个页面
        }



        @Override

        public int getCount() {
            return list_fragment.size();//有几个页面
        }

    }

viewpager monitor

  public class MyPagerChangeListener implements ViewPager.OnPageChangeListener {

        @Override
        public void onPageScrollStateChanged(int arg0) {
        }

        @Override
        public void onPageScrolled(int arg0, float arg1, int arg2) {

        }

        @Override
        public void onPageSelected(int arg0) {
//        setMyViewPager(arg0);//初始化tob
            pos_now=arg0;
        }
    }

Add fragment to viewpager

myViewPager.setOnPageChangeListener(new MyPagerChangeListener()); //把Fragment添加到List集合里面
list_fragment = new ArrayList<>();
for (int i = 0; i < list.size(); i++) {
    ItmeFragment_ErrorSubject itmeFragment = new ItmeFragment_ErrorSubject();
    Bundle bundle = new Bundle();
    bundle.putInt("pos", i);
    itmeFragment.setArguments(bundle);
    list_fragment.add(itmeFragment);
}
adapter = new TabFragmentPagerAdapter(getSupportFragmentManager());
myViewPager.setAdapter(adapter);

Refresh processing

list.remove(pos_now);
list_fragment.remove(pos_now);
tvTotal.setText(list.size() + "");
adapter.notifyDataSetChanged();