java - 调用了 Baseadapter getCount 但未调用 getview

Question

我遇到了 getview 未在 baseadapter 内部调用的奇怪问题。

场景:

• 主 fragment 有一个轮播(加载效果非常好)
• 单击按钮会显示带有另一个轮播的另一个 fragment
• 从服务器获取数据并调用适配器
• 适配器被毫无问题地调用
• GetCount() 被调用
• GetView() 不会被调用

<小时/>

Interestingly the getView method is fired when the fragment is popped or back button is pressed.

<小时/>

适配器代码

public class VideCarouselAdapter extends BaseAdapter {

    private Context context;
    private NavigationFragment nf;
    private float scale;

    ArrayList<DataModel> videoList = new ArrayList<DataModel>();
    public VideCarouselAdapter(Context context,NavigationFragment nf) {
        this.context = context;
        this.nf=nf;
    }

    public void setData(ArrayList<DataModel> videoList) {
        Timber.log(Log.DEBUG,"VideCarouselAdapter instantiated");
        System.out.println(videoList);
        this.videoList=videoList;
        System.out.println("Total items"+videoList.size());
    }

    @Override
    public Object getItem(int position)
    {
        return videoList.get(position);
        //return VideosCarouselItem.newInstance(context, position, scale,videoList.get(position).getVideoID());
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(final int position, View convertView, final ViewGroup parent) {
        Timber.log(Log.DEBUG,"VideCarouselAdapter GEtView");
        View rowView = convertView;

        if (rowView == null) {
            LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            rowView = inflater.inflate(R.layout.item_coverflow, null);

            ViewHolder viewHolder = new ViewHolder();
            viewHolder.text = (TextView) rowView.findViewById(R.id.label);
            viewHolder.image = (SimpleDraweeView) rowView
                    .findViewById(R.id.image);
            rowView.setTag(viewHolder);
        }

        ViewHolder holder = (ViewHolder) rowView.getTag();
        Uri uri = Uri.parse("http://img.youtube.com/vi/"+videoList.get(position).getVideoID()+"/0.jpg");
        Timber.log(Log.DEBUG, "SETTING IMAGE FOR RELATED CAROUSEL "+"http://img.youtube.com/vi/"+videoList.get(position).getVideoID()+"/0.jpg");
        holder.image.setImageURI(uri);
        holder.text.setText(videoList.get(position).getTitle());
        holder.image.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Timber.log(Log.DEBUG,"Image touched "+parent.getClass().toString());
                CoverFlowCarousel coverflow=((CoverFlowCarousel)parent);
                int currentSelection=coverflow.getSelection();
                if(currentSelection==position) {
                    nf.presentFragment(VideoInformation.newInstance(videoList.get(position).getVideoID(),videoList.get(position).getTitle(),
                            videoList.get(position).getDescription()));
                    return;
                };
                if(currentSelection<position){
                    coverflow.fling(Math.round(coverflow.getX()+1200),Math.round(coverflow.getY()));
                }else{
                    coverflow.fling(Math.round(coverflow.getX()-1200),Math.round(coverflow.getY()));
                }


            }
        });

        return rowView;
    }

    @Override
    public int getCount()
    {
        Timber.log(Log.DEBUG,"VideCarouselAdapter COunt "+videoList.size());
        return videoList.size();
    }

    static class ViewHolder {
        public TextView text;
        public SimpleDraweeView image;
    }


}

fragment 在屏幕上时的调试日志

VideCarouselAdapter COunt 12
VideCarouselAdapter COunt 12
VideCarouselAdapter COunt 12
VideCarouselAdapter COunt 12
VideCarouselAdapter COunt 12

fragment 被消除时的调试日志

SETTING IMAGE FOR RELATED CAROUSEL http://img.youtube.com/vi/kJQqJgGpfeQ/0.jpg
VideCarouselAdapter COunt 15
VideCarouselAdapter COunt 15
VideCarouselAdapter GEtView
SETTING IMAGE FOR RELATED CAROUSEL http://img.youtube.com/vi/H403Uyf_TC0/0.jpg
VideCarouselAdapter COunt 15
VideCarouselAdapter COunt 15
VideCarouselAdapter GEtView
SETTING IMAGE FOR RELATED CAROUSEL http://img.youtube.com/vi/78x8iOdUdXg/0.jpg
VideCarouselAdapter COunt 15
VideCarouselAdapter COunt 15
VideCarouselAdapter GEtView
SETTING IMAGE FOR RELATED CAROUSEL http://img.youtube.com/vi/Pi7NhJE7O_0/0.jpg
VideCarouselAdapter COunt 15
VideCarouselAdapter COunt 15
VideCarouselAdapter GEtView
SETTING IMAGE FOR RELATED CAROUSEL http://img.youtube.com/vi/MMg1TpADGBw/0.jpg
VideCarouselAdapter COunt 15
VideCarouselAdapter GEtView
SETTING IMAGE FOR RELATED CAROUSEL http://img.youtube.com/vi/j3PwwoTjpNg/0.jpg
VideCarouselAdapter GEtView
SETTING IMAGE FOR RELATED CAROUSEL http://img.youtube.com/vi/jB_zCJ2s2jc/0.jpg
VideCarouselAdapter GEtView
SETTING IMAGE FOR RELATED CAROUSEL http://img.youtube.com/vi/SrldmVxWu_s/0.jpg
VideCarouselAdapter GEtView
SETTING IMAGE FOR RELATED CAROUSEL http://img.youtube.com/vi/ytka9QZoNAw/0.jpg

子 fragment 内当前轮播创建代码

private void setupCoverflow(){
    Timber.log(Log.DEBUG,"SETTING UP RELATED VIDEOS");
    carousel.setSpacing(0.55f);
    carousel.setScaleX(1.5f);
    carousel.setRotation(0.0f);
    adapter = new VideCarouselAdapter(getActivity(),this);
    adapter.setData(videoList);
    carousel.setAdapter(adapter);
    if(carouselCurrentItem==0)
        carousel.setSelection(adapter.getCount()/2);
    else
        carousel.setSelection(carouselCurrentItem);
    txtVideoTitle.setText(videoList.get(carousel.getSelection()).getTitle());


    carousel.setOnItemSelectedListener(new Carousel.OnItemSelectedListener() {
        @Override
        public void onItemSelected(View child, int position) {
            txtVideoTitle.setText(videoList.get(position).getTitle());
            carouselCurrentItem=position;
        }
    });

}

主要 fragment (工作轮播) https://picasaweb.google.com/lh/photo/_7J6d3winzVWXf8eiAYqxe4jdbH5efcZ8QVU3HGZSEA

子 fragment (类似的代码，但轮播不起作用) https://picasaweb.google.com/lh/photo/p12bBck2bDWWFGiHqaZwWe4jdbH5efcZ8QVU3HGZSEA

红色表示轮播 View 可见。正如我在帖子中提到的，数据已加载，并且使用正确的计数调用 getcount 事件。

Answer 1

使用

 adapter = new VideCarouselAdapter(getActivity(),this);
            adapter.setData(videoList);
YOUR_LISTVIEW.setAdapter(adapter);