目前,我正在探索更多关于recyclerview和gridlayoutmanager的内容,并试图为gallery显示实现一个漂亮的ui,但是gridlayoutmanager的跨度大小有一些问题。正如documentation所说:
默认情况下,每个项目占用1个跨度。您可以通过设置pansizelookup(spansizelookup)提供自定义gridlayoutmanager.spansizelookup实例来更改它。
有了这个,我希望如果我将项目的跨距设置为2,位置为0,那么colspan和rowspan也将设置为2,但似乎不是这样工作的。我设置我的列计数为2为我的GridLayoutManager为纵向和4为横向。它对肖像画效果很好,但对风景画效果不好,因为它在第二和第三个项目下面创建了两个空单元格,我猜第一个项目没有获得第二和第三个项目的行宽,否则它真的会留下一个空单元格。
这是我的代码:

gallery = new ArrayList<HashMap<String, String>>();
        adapter = new GalleryAdapter(getBaseContext(), gallery);

        // using grid layout manager
        GridLayoutManager mLayoutManager = new GridLayoutManager(this, getResources().getInteger(R.integer.col_count));

        mLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
            @Override
            public int getSpanSize(int position) {
                switch(adapter.getItemViewType(position)){
                    case 2:
                        return 2;
                    case 1:
                        return 1;
                    default:
                        return -1;
                }
            }
        });

        list_news.setLayoutManager(mLayoutManager);
        list_news.setAdapter(adapter);

Adapter:
public class GalleryAdapter extends RecyclerView.Adapter<GalleryAdapter.ViewHolder> {

    Context context;
    ArrayList<HashMap<String, String>> article;
    ImageLoader mImageLoader;

    @Override
    public int getItemCount() {
        return article.size();
    }

    public GalleryAdapter(Context context, ArrayList<HashMap<String, String>> article){
        this.context = context;
        this.article = article;
    }

    // Create new views (invoked by the layout manager)
    @Override
    public GalleryAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        // create a new view
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.articles_item, parent, false);
        // set the view's size, margins, paddings and layout parameters
        ViewHolder vh = new ViewHolder(v);
        return vh;
    }

    @Override
    public int getItemViewType(int position) {
        // Just as an example, return 0 or 2 depending on position
        // Note that unlike in ListView adapters, types don't have to be contiguous
        if(position==0){
            return 2;
        }else{
            return 1;
        }
    }

    // Replace the contents of a view (invoked by the layout manager)
    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        // - get element from your dataset at this position
        // - replace the contents of the view with that element
        mImageLoader = VolleyQueue.getInstance(context).getImageLoader();
        holder.image.setImageUrl(article.get(position).get("image"), mImageLoader);
        holder.image.setDefaultImageResId(R.drawable.test);
    }

    static class ViewHolder extends RecyclerView.ViewHolder {
        @Bind(R.id.image) NetworkImageView image;

        public ViewHolder(View view) {
            super(view);
            ButterKnife.bind(this, view);
    }



}
}

下面是横向和纵向的结果截图:
android - GridLayoutManager setSpanSizeLookup创建空白单元格-LMLPHP
android - GridLayoutManager setSpanSizeLookup创建空白单元格-LMLPHP
有什么办法可以避免空白单元格吗?
更新:
为了更好地想象我正在努力实现的目标,这里有一个我想要的景观模式的图像。数字是基于预期位置的项目。
android - GridLayoutManager setSpanSizeLookup创建空白单元格-LMLPHP

最佳答案

SpanSizeLookup代码更改为

mLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
    @Override
    public int getSpanSize(int position) {
        return adapter.getItemViewType(position);
    }
});

适配器的getItemViewType代码
@Override
public int getItemViewType(int position) {
    if (position == 0) {
        return context.getResources().getInteger(R.integer.col_count);
    } else {
        return 1;
    }
}

10-08 15:13