FragmentPagerAdapter动态增删Fragment不更新

桃扇骨 2023-02-18 03:01 38阅读 0赞

public class ResumePreviewAdapter extends FragmentPagerAdapter { 
        private ArrayList<Fragment> fragments;
        private String[] tabTitles;
    
    
        public ResumePreviewAdapter(FragmentManager fm, ArrayList<Fragment> fragments, String[] tabTitles) { 
            super(fm);
            this.fragments = fragments;
            this.tabTitles = tabTitles;
        }
    
        @Override
        public Fragment getItem(int position) { 
            if (null != fragments && position > -1 && position < fragments.size()) { 
                return fragments.get(position);
            }
            return null;
        }
    
        @Override
        public int getCount() { 
            return fragments == null ? 0 : fragments.size();
        }
    
    
        @Override
        public long getItemId(int position) { 
            // 获取当前数据的hashCode
            int hashCode = fragments.get(position).hashCode();
            return hashCode;
        }
    
        @Override
        public Parcelable saveState() { 
            return null;
        }
    
        /** * 使用这个方式，让页面不缓存，能够在清除fragment的时候对其做了删除 * 复写pageradapter的getItemPosition方法设置tag为POSITION_NONE意思是没有找到child要求重新加载。 * * @return */
        @Override
        public int getItemPosition(@NonNull Object object) { 
            return PagerAdapter.POSITION_NONE;
        }
    
        @Override
        public CharSequence getPageTitle(int position) { 
            return tabTitles[position];
        }
    
        @Override
        public void finishUpdate(ViewGroup container) { 
            // 避免 android.os.Handler android.support.v4.app.FragmentHostCallback.getHandler()' on a null object reference
            // bugly ：https://bugly.qq.com/v2/crash-reporting/crashes/2390cd07d3/107320?pid=1
            try { 
                super.finishUpdate(container);
            } catch (Exception egnore) { 
            }
        }
    }