java - Android ViewPager 删除当前页面并移至下一个

Question

在 ViewPager 中，当用户单击删除按钮时，我试图删除当前页面并移至下一页。当我尝试下面的代码时，它会移动到下一页但会删除最后一页。请帮助我。

@Override
public Object instantiateItem(ViewGroup container, final int IdxVal)
{
    LinearLayout linearLayout = new LinearLayout(context);
    linearLayout.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));

    ImageView imageView = new ImageView(context);
    imageView.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));

    Glide.with(context)
            .load(imageListAryVar.get(IdxVal))
            .fitCenter()
            .into(imageView);

    linearLayout.addView(imageView);
    container.addView(linearLayout);

    return linearLayout;
}

@Override
public void destroyItem(ViewGroup container, int position, Object object)
{
    container.removeView((LinearLayout) object);
}

void delCurrentPageFnc()
{
    int delIdxVar = viewPager.getCurrentItem();

    if(imageListAryVar.size() > 1)
    {
        if (delIdxVar == imageListAryVar.size() - 1)
            viewPager.setCurrentItem(delIdxVar - 1);
        else
            viewPager.setCurrentItem(delIdxVar + 1);

        imageListAryVar.remove(delIdxVar);
        notifyDataSetChanged();
    }
    else finish();
}

Answer 1

经过几次尝试，我通过添加 getItemPosition 和设置 return POSITION_NONE; 解决了这个问题。
如果你不添加这个 notifyDataSetChanged(); 方法行不通。

@Override
public int getItemPosition(Object object)
{
    return POSITION_NONE;
}

void delCurrentPageFnc()
{
    int delIdxVar = viewPager.getCurrentItem();

    if(imageListAryVar.size() > 1)
    {
        imageListAryVar.remove(delIdxVar);
        notifyDataSetChanged();
    }
    else finish();
}

设置 getItemPosition 后这是不必要的，所以删除

if (delIdxVar == imageListAryVar.size() - 1) 
    viewPager.setCurrentItem(delIdxVar - 1);
else 
   viewPager.setCurrentItem(delIdxVar + 1);