FragmentPagerAdapter的getItem不叫 [英] FragmentPagerAdapter getItem is not called

问题描述

我不能够重用片段FragmentPagerAdapter ..使用destroyItem（）方法，它是删除片段，但仍不能称之为getItem（）时again..There只是2-3图像，所以我使用而不是FragmentPagerAdapter FragmentStatePagerAdapter ..

 公共类ExamplePagerAdapter扩展FragmentPagerAdapter {
    ArrayList的＆LT;字符串＆GT;网址;
    INT大小= 0;
    公共ExamplePagerAdapter（FragmentManager FM，ArrayList的＆LT;字符串＆GT;水库）{
        超（FM）;
        网址=资源;
        大小= urls.size（）;

    }

    @覆盖
    公众诠释getCount将（）{
        如果（网址== NULL）
        {
            返回0;
        }
        其他
        {

        返回的大小;
        }

    }
    @覆盖
    公共无效destroyItem（ViewGroup中的容器，INT位置，Object对象）{
        FragmentManager经理=（（片段）对象）.getFragmentManager（）;
        FragmentTransaction反式= manager.beginTransaction（）;
        trans.remove（（片段）的对象）;
        trans.commit（）;
    }

    @覆盖
    公共片段的getItem（INT位置）{

        片段片段=新FloorPlanFragment（）;
        叠B =新包（）;
        b.putInt（P，位）;
        b.putString（形象，urls.get（位置））;
        Log.i（图像，+ urls.get（位置））;
        fragment.setArguments（B）;
        返回片段;
    }


}
 

}

和在FragmentActivity，

  pager.setAdapter（新ExamplePagerAdapter（getSupportFragmentManager（），RES2））;
 

解决方案

KISS答案

简单的使用 FragmentStatePagerAdapter 而不是 FragmentPagerAdapter

我得到了答案..首先我想删除这个问题，因为我做了非常愚蠢的错误，但这个答案会帮助别人谁也面临同样的问题，而不是 FragmentPagerAdapter ，使用 FragmentStatePagerAdapter ..

I am not able to reuse fragment in FragmentPagerAdapter.. Using destroyItem() method, It is deleting the fragment but still does not called getItem() again..There are just 2-3 Images so I am using FragmentPagerAdapter Instead of FragmentStatePagerAdapter..

    public class ExamplePagerAdapter extends FragmentPagerAdapter {
    ArrayList<String> urls;
    int size=0;
    public ExamplePagerAdapter(FragmentManager fm, ArrayList<String> res) {
        super(fm);
        urls = res;
        size=urls.size();

    }

    @Override
    public int getCount() {
        if(urls==null)
        {
            return 0;
        }
        else
        {

        return size;
        }

    }
    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        FragmentManager manager = ((Fragment)object).getFragmentManager();
        FragmentTransaction trans = manager.beginTransaction();
        trans.remove((Fragment)object);
        trans.commit();
    }

    @Override
    public Fragment getItem(int position) {

        Fragment fragment = new FloorPlanFragment();
        Bundle b = new Bundle(); 
        b.putInt("p", position); 
        b.putString("image", urls.get(position));
        Log.i("image", ""+urls.get(position));
        fragment.setArguments(b);           
        return fragment;
    }


}

}

And In FragmentActivity,

    pager.setAdapter(new ExamplePagerAdapter(getSupportFragmentManager(), res2)); 

解决方案

KISS Answer

Simple use FragmentStatePagerAdapter instead of FragmentPagerAdapter

I got the answer.. Firstly I thought to delete this question as I am doing a very silly mistake but this answer will help someone who is facing the same problem that Instead of FragmentPagerAdapter, use FragmentStatePagerAdapter..

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