android - RecyclerView 查看项目

Question

我想在 RecyclerView 中显示 2 列，但它们显示在 1 列中，就像这张照片:

如何在 2 列中显示我的 View ？

我在我的代码中尝试使用 2 列:

rcv_pro.setLayoutManager(new GridLayoutManager(this, 2, LinearLayoutManager.VERTICAL, false));

但它们不会显示在 2 列中。

我在 2 culmn 中找到了一个 soulottion，我可以在清除此代码的情况下修复它:"menuList_info_models.clear(); "但我现在有一个新问题，当我清除那个 cod 时，我在 recyclerview 中的项目一团糟，任何时候我在 recyclerview 中滚动，我的项目都会改变

public class MultiItem_Music_Adapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
    ArrayList<Object> objects = new ArrayList<Object>();
    Context context;

    private final static int MUSIC_CAT = 1;
    private final static int MUSIC_ADA = 2;
    private ArrayList<MenuList_Info_Model> menuList_info_models;
    private ArrayList<Cat_Model> cat_models;
    private Music_Adapter adapter;
    private List<MenuList_Info_Model> personList = new ArrayList<>();
    private RecyclerView recyclerView;
    private ListAdapter mAdapter;
    private ArrayList<MenuList_Info_Model> music_data;
    public GridLayoutManager manager ;

    public MultiItem_Music_Adapter(ArrayList<Object> objects, Context context) {
        Log.e("MyLog","farzad");
        this.objects = objects;
        this.context = context;
        if (menuList_info_models == null)
            menuList_info_models = new ArrayList<MenuList_Info_Model>();
        if (cat_models == null) cat_models = new ArrayList<Cat_Model>();

        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;
        }
    }
}

Answer 1

你可以使用 GridLayoutManager

set GridLayoutManager to your RecyclerView uisng below code

GridLayoutManager  gridLayoutManager = new GridLayoutManager(MainActivity.this, 2);
recyclerView.setLayoutManager(gridLayoutManager);

这里是链接如何使用 GridLayoutManager使用 RecyclerView