Android卡基于位置的多种布局

下面是您的适配器类的大致外观

public class CardAdapter extends RecyclerView.Adapter<RecylerView.ViewHolder>{
    private List<CardData> mItems;
    private Context context;
    private SendInfoToCards cardDatas;
    private boolean mainMenu;
    private static final int FIRST = 1;
    private static final int SECOND = 2;

    public CardAdapter(Context c, SendInfoToCards datas, boolean main) {
        super();
        this.context = c;
        this.cardDatas = datas;
        mItems = datas.getList();
        this.mainMenu = main;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int type) {
        if(type == SECOND){
            View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.second_layout, viewGroup, false);
            return new SecondViewViewHolder(v);
        } else {
            View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.first_layout, viewGroup, false);
            return new FirstViewViewHolder(v);
        }
    }

    @Override
    public void onBindViewHolder(ViewHolder viewHolder, int i) {
        if(viewHolder instanceof SecondViewViewHolder){
            SecondViewViewHolder secondViewViewHolder = (SecondViewViewHolder) viewHolder;
            // bind second views
            secondViewViewHolder.imgThumbnail.setImageResource(R.id.img_resource);
        } else {
            FirstViewViewHolder firstViewViewHolder = (FirstViewViewHolder) viewHolder;
            // bind firs view
            firstViewViewHolder.imgThumbnail.setImageResource(R.id.img_resource);
        }
    }

    @Override
    public int getItemViewType(int position) {
        if (position == 0) {
            return FIRST;
        } else {
            return SECOND;
        }
    }

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

    class FirstViewViewHolder extends RecyclerView.ViewHolder{
        public ImageView imgThumbnail;
        public TextView tvMovie;

        public FirstViewViewHolder(View itemView) {
            super(itemView);
            imgThumbnail = (ImageView)itemView.findViewById(R.id.img_thumbnail);
            tvMovie = (TextView)itemView.findViewById(R.id.tv_movie);
        }
    }

    class SecondViewViewHolder extends RecyclerView.ViewHolder{
        public ImageView imgThumbnail;
        public TextView tvMovie;
        public ImageView imgThumbnail2;
        public TextView tvMovie2;

        public SecondViewViewHolder(View itemView) {
            super(itemView);
            //find viewby id
        }
    }
}

改变了什么

由于recyclerview可以处理多种视图类型,因此您可以根据某些条件决定膨胀哪个布局。您可以通过重写 获取项目视图类型方法() RecylerView适配器的

 @Override
 public int getItemViewType(int position) {
    if (position == 0) {
         return FIRST;
    } else {
       return SECOND;
    }
}

创建取景器时。onCreateViewHolder方法将获取视图类型。根据类型,您应该放大适当的布局并返回适当的取景器

@Override
public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int type) {
   if(type == SECOND){
        View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.second_layout, viewGroup, false);
        return new SecondViewViewHolder(v);
    } else {
        View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.first_layout, viewGroup, false);
        return new FirstViewViewHolder(v);
    }
}

由于涉及两个布局,我创建了两个视图夹持器来容纳第一个和第二个布局。(FirstViewHolder和SecondViewHolder)。因此,您必须将适配器的ViewHolder类型设置为基本ViewHolder类,如下所示

public class CardAdapter extends RecyclerView.Adapter<RecylerView.ViewHolder>{
   ...
}

现在,在onBindViewHolder方法中,您可以确定当前绑定的ViewHolder,并进行相应的工作

 @Override
public void onBindViewHolder(ViewHolder viewHolder, int i) {
    if(viewHolder instanceof SecondViewViewHolder){
        SecondViewViewHolder secondViewViewHolder = (SecondViewViewHolder) viewHolder;
        // bind second views
            secondViewViewHolder.imgThumbnail.setImageResource(R.id.img_resource);
    } else {
        FirstViewViewHolder firstViewViewHolder = (FirstViewViewHolder) viewHolder;
        // bind firs view
        firstViewViewHolder.imgThumbnail.setImageResource(R.id.img_resource);
    }
}

检查 this 例如

问题是,第二个参数不是位置,而是 viewType .

从 docs :

public abstract VH onCreateViewHolder (ViewGroup parent, int viewType)

看看 public void onBindViewHolder (VH holder, int position, List<Object> payloads) ,这才是你真正需要的