【如何用RecyclerView 查看项目】 <原文地址https://www.itbaoku.cn/post/2...;
rcv_pro.setLayoutManager(new GridLayoutManager(this, 2, LinearLayoutManager.VERTICAL, false));
但它们不会显示在 2 列中.
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我在 2 culmn 中找到了一个显示的灵魂，我可以修复它并清除此代码:" menuList_info_models.clear();
"但我现在有一个新的问题，当我清除 cod 时，我在 recyclerview 中的物品一团糟，每当我在 recyclerview 中滚动时，我的物品都会改变
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public class MultiItem_Music_Adapter extends RecyclerView.Adapter { ArrayList objects = new ArrayList();
Context context;
private final static int MUSIC_CAT = 1;
private final static int MUSIC_ADA = 2;
private ArrayList menuList_info_models;
private ArrayList cat_models;
private Music_Adapter adapter;
private List personList = new ArrayList<>();
private RecyclerView recyclerView;
private ListAdapter mAdapter;
private ArrayList music_data;
public GridLayoutManager manager ;
public MultiItem_Music_Adapter(ArrayList objects, Context context) { Log.e("MyLog","farzad");
this.objects = objects;
this.context = context;
if (menuList_info_models == null) menuList_info_models = new ArrayList();
if (cat_models == null) cat_models = new ArrayList();
adapter = new Music_Adapter(menuList_info_models, this.context);
} @Override public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { RecyclerView.ViewHolder viewHolder ;
LayoutInflater inflater = LayoutInflater.from(context);
View view;
switch (viewType) { case MUSIC_CAT: view = inflater.inflate(R.layout.music_cat_item, parent, false);
viewHolder = new Music_cat_ViewHolder(view);
break;
case MUSIC_ADA: view= inflater.inflate(R.layout.music_item_multi, parent, false);
viewHolder = new Multi_item_ViewHolder(view);
break;
default: view = inflater.inflate(R.layout.music_item_multi, parent, false);
viewHolder = new Multi_item_ViewHolder(view);
break;
} return viewHolder;
} @Override public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) { Log.e("hamid_ali", "---------------------");
switch (holder.getItemViewType()) { case MUSIC_CAT: Cat_Config((Music_cat_ViewHolder) holder,position);
break;
case MUSIC_ADA: item_Config((Multi_item_ViewHolder) holder,position);
break;
} } private void item_Config(Multi_item_ViewHolder item_viewHolder,int pos) { MenuList_Info_Model menuList_info_model = (MenuList_Info_Model) objects.get(pos);
menuList_info_models.clear();
menuList_info_models.add(menuList_info_model);
Log.e("hamid_st",menuList_info_models.size() +"");
manager = new GridLayoutManager(this.context, 2, LinearLayoutManager.VERTICAL, false);
item_viewHolder.rcv_multi.setLayoutManager(manager);
item_viewHolder.rcv_multi.setAdapter(adapter);
} private void Cat_Config(Music_cat_ViewHolder musicCatViewHolder,int pos) { Cat_Model cat_model = (Cat_Model) objects.get(pos);
musicCatViewHolder.txt_cat_name.setText(cat_model.getMenu_name());
} @Override public int getItemCount() { return objects.size();
} @Override public int getItemViewType(int position) { if (objects.get(position) instanceof Cat_Model) { return MUSIC_CAT;
} else { return MUSIC_ADA;
} } }
解决方案：
我必须创建两个ViewHolder 查看更多代码
public class MyAdapter extends RecyclerView.Adapter {
class ViewHolder0 extends RecyclerView.ViewHolder {
...
public ViewHolder0(View itemView){
...
}
}class ViewHolder2 extends RecyclerView.ViewHolder {
...
public ViewHolder2(View itemView){
...
}@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
return position % 2 * 2;
}@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
switch (viewType) {
case 0: return new ViewHolder0(...);
case 2: return new ViewHolder2(...);
...
}
}@Override
public void onBindViewHolder(final RecyclerView.ViewHolder holder, final int position) {
switch (holder.getItemViewType()) {
case 0:
ViewHolder0 viewHolder0 = (ViewHolder0)holder;
...
break;
case 2:
ViewHolder2 viewHolder2 = (ViewHolder2)holder;
...
break;
}
}
}
其他解决方案
你可以使用GridLayoutManager
<块引用>
将 GridLayoutManager 设置为您的 RecyclerView 下面代码
GridLayoutManagergridLayoutManager = new GridLayoutManager(MainActivity.this, 2);
recyclerView.setLayoutManager(gridLayoutManager);
这里是如何使用 GridLayoutManager 的链接 与 RecyclerView
其他解决方案
RvAdapter MultiItem_Music_Adapter ;
RecyclerView rcv_pro;
MultiItem_Music_Adapter = new MultiItem_Music_Adapter (getActivity());
rcv_pro.setLayoutManager(new GridLayoutManager(getActivity(), 2));
rcv_pro.setAdapter(MultiItem_Music_Adapter );
?
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