android.support.v4.view.ViewPager$LayoutParams 无法转换为 android.view.ViewGroup$MarginLayoutParams

Question

mPagerAdapter = new PagerAdapter() {
        @Override
        public boolean isViewFromObject(View arg0, Object arg1) {
            return arg0 == arg1;
        }

        @Override
        public int getCount() {
            return views.size();
        }

        @Override
        public void destroyItem(View container, int position, Object object) {
            ((ViewPager)container).removeView(views.get(position));
        }


        @Override
        public Object instantiateItem(View container, int position) {
            ((ViewPager)container).addView(views.get(position));
            return views.get(position);
        }
    };

        mTabPager.setAdapter(mPagerAdapter);

After My Fragment has created, I call function:

public void AddView(View v, int index)
{
    views.add(index, v);
    mPagerAdapter.notifyDataSetChanged();
}

But it report android.support.v4.view.ViewPager$LayoutParams cannot be cast to android.view.ViewGroup$MarginLayoutParams

Answer 1

    @Override
    public void destroyItem(View container, int position, Object object) {
        ((ViewPager)container).removeView(views.get(position));
    }


    @Override
    public Object instantiateItem(View container, int position) {
        ((ViewPager)container).addView(views.get(position));
        return views.get(position);
    }

试试这个，使用您的 ViewPager 实例替换转换范围“((ViewPager)container)”，像这样，mViewPager.removeView(views.get(position));