FragmentPagerAdapter getItem 未被调用 [英] FragmentPagerAdapter getItem is not called

问题描述

我无法在 FragmentPagerAdapter 中重用片段.. 使用 destroyItem() 方法，它正在删除片段但仍然没有再次调用 getItem() ..只有 2-3 个图像所以我使用 FragmentPagerAdapter 而不是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;
    }
}

在 FragmentActivity 中，

And In FragmentActivity,

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

推荐答案

KISS 答案:

简单使用 FragmentStatePagerAdapter 而不是 FragmentPagerAdapter.

Simple use FragmentStatePagerAdapter instead of FragmentPagerAdapter.

我得到了答案..首先我想删除这个问题，因为我犯了一个非常愚蠢的错误，但这个答案将帮助面临同样问题的人，而不是 FragmentPagerAdapter，使用 <代码>FragmentStatePagerAdapter.

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.

正如@BlackHatSamurai 在评论中提到的:

As @BlackHatSamurai mentioned in the comment:

这样做的原因是因为 FragmentStatePagerAdapter 破坏了作为未使用的片段.FragmentPagerAdapter 没有.

The reason this works is because FragmentStatePagerAdapter destroys as Fragments that aren't being used. FragmentPagerAdapter does not.

这篇关于FragmentPagerAdapter getItem 未被调用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！