在RecyclerView中按位置组织视图 [英] Organize views in RecyclerView by their Position
问题描述
这是我的FeedAdapter:
So this is my FeedAdapter:
public class FeedAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private final int VIEW_TYPE_VERTICAL = 1;
private final int VIEW_TYPE_HORIZONTAL = 2;
private final int VIEW_TYPE_AD = 3;
private Context context;
private ArrayList<Object> items;
private List<Vertical> listVertical;
private List<Horizontal> listHorizontal;
private List<Adlist> listAd;
public FeedAdapter(Context context, ArrayList<Object> items, List<Vertical> listVertical,List<Horizontal> listHorizontal, List <Adlist> adList) {
this.context = context;
this.items = items;
this.listVertical = listVertical;
this.listHorizontal = listHorizontal;
this.listAd = adList;
}
我的Feed中有一个水平,垂直和备用的AD视图(与Goggle广告服务无关). 项目=三个不同的项目,所以三个不同的视图
I have a horizontal, vertical and a alternative AD view (this has nothing to do with Goggle Ad Service btw) in my Feed. Items = three different items, so three different views
需要更好的理解:这是onCreate方法:
Fot a better understanding: this the onCreate Method:
public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int viewType) {
LayoutInflater inflater = LayoutInflater.from(context);
View view;
RecyclerView.ViewHolder holder = null;
switch (viewType) {
case VIEW_TYPE_VERTICAL:
view = inflater.inflate(R.layout.newsfeed_vertical,viewGroup,false);
holder = new VerticalViewHolder(view);
break;
case VIEW_TYPE_HORIZONTAL:
view = inflater.inflate(R.layout.newsfeed_horizontal,viewGroup,false);
holder = new HorizontalViewHolder(view);
break;
case VIEW_TYPE_AD:
view = inflater.inflate(R.layout.newsfeed_vertical,viewGroup,false);
holder = new AdViewHolder(view);
break;
这是onBindViewHolder:
an this the onBindViewHolder:
@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
if (holder.getItemViewType() == VIEW_TYPE_VERTICAL)
verticalView((VerticalViewHolder) holder);
else if (holder.getItemViewType() == VIEW_TYPE_HORIZONTAL)
horizontalView((HorizontalViewHolder) holder);
else if (holder.getItemViewType() == VIEW_TYPE_AD)
adView((AdViewHolder) holder);
}
public void verticalView (VerticalViewHolder holder ){
VerticalScrollAdapter adapter_v = new VerticalScrollAdapter(listVertical);
holder.recyclerView.setLayoutManager(new LinearLayoutManager(context));
holder.recyclerView.setAdapter(adapter_v);
}
public void horizontalView (HorizontalViewHolder holder) {
HorizontalScrollAdapter adapter_h = new HorizontalScrollAdapter(listHorizontal);
holder.recyclerView.setLayoutManager(new LinearLayoutManager(context,LinearLayoutManager.HORIZONTAL,false));
holder.recyclerView.setAdapter(adapter_h);
}
public void adView (AdViewHolder holder) {
AdScrollAdapter adapter_ad = new AdScrollAdapter(adList);
holder.recyclerView.setLayoutManager(new LinearLayoutManager(context));
holder.recyclerView.setAdapter(adapter_ad);
}
所以我正在使用getItemViewType来了解我正在解析的视图:
So I'm using the getItemViewType to understand which view I'm parsing:
@Override
public int getItemCount() {
Log.e("items.size", String.valueOf(items.size()));
return items.size();
}
@Override
public int getItemViewType(int position) {
if (items.get(position) instanceof Vertical)
return VIEW_TYPE_VERTICAL;
if (items.get(position) instanceof Horizontal)
return VIEW_TYPE_HORIZONTAL;
if(items.get(position) instanceof Adlist)
return VIEW_TYPE_AD;
return -1;
}
但是我的Feed有了以下结构:
But with this my Feed get's the following structure:
- 垂直视图
- 水平视图
- 广告观看
我想像这样组织我的Feed
I'd like to organize my Feed like this
VERTIAL VIEW [0] = only 1 view (a box basically) with the first position of the LinearLayout Manager
HORIZONTAL VIEW = full list of my horizontal Views here / second position of my LinearLayoutManager
AD VIEW [0] = at the third position
VERTICAL VIEW [1-5]
AD VIEW [1] = @ position 6 in the LinearLayout
VERTICAL VIEW [5- ** ]
所以我知道我必须使用findViewHolderForAdapterPosition和findViewHolderForLayoutPosition,但是:在我的代码中应该放在哪里?
So I know I have to work with findViewHolderForAdapterPosition and findViewHolderForLayoutPosition, but: Where do I have put these in my Code?
推荐答案
对您的items
列表进行排序/构造,以使其具有正确顺序的项目.
Sort/construct your items
list so that it has the items in the correct order.
理想情况下,您将从三种类型的分区开始(即,一个Vertical
项列表,第二个Horizontal
项列表和第三个Ad
项列表).然后,您可以像这样建立整体列表:
Ideally, you'd start with your three types partitioned (i.e. one list of Vertical
items, a second list of Horizontal
items, and a third list of Ad
items). Then you could build your overall list like this:
this.items = new ArrayList<>();
if (listVertical.size() > 0) {
items.add(listVertical.remove(0));
}
if (listHorizontal.size() > 0) {
items.add(listHorizontal.remove(0));
}
while (listVertical.size() > 0 || listAd.size() > 0) {
if (listAd.size() > 0) {
items.add(listAd.remove(0));
}
int count = 5;
while (count > 0 && listVertical.size() > 0) {
items.add(listVertical.remove(0));
}
}
这将循环添加一个垂直视图,然后一个水平视图,然后一个广告视图+ 5个垂直视图,直到您用尽"广告视图和垂直视图.我相信这符合您想要的结构.
This will add one vertical view, then one horizontal view, and then one ad view + five vertical views in a loop until you "run out" of both ad views and vertical views. I believe that matches your desired structure.
最后,您的三个列表将为空(因为您将remove()
d个项目全部从其中剔除).如果需要避免这种情况,可以创建副本:
At the end, your three lists will be empty (because you will have remove()
d all items from them). If you need to avoid this, you can create copies:
List<Vertical> verticalCopy = new ArrayList<>(listVertical);
// and so on
然后您可以只使用verticalCopy
代替上面的代码中的listVertical
.
And then you can just use verticalCopy
instead of listVertical
in the above code.
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