Aitem  XML 3张图片

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <ImageView
            android:id="@+id/img"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:src="@mipmap/ic_launcher" />

        <ImageView
            android:id="@+id/img2"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:src="@mipmap/ic_launcher" />

        <ImageView
            android:id="@+id/img3"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:src="@mipmap/ic_launcher" />
    </LinearLayout>
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:id="@+id/name"
        android:text="hh"
        android:textSize="20sp"/>
</LinearLayout>

Bitem XML 1张图片 

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal">

    <TextView
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:id="@+id/name"
        android:text="hh"
        android:textSize="20sp"/>
    <ImageView
        android:id="@+id/img3"
        android:layout_marginRight="20dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@mipmap/ic_launcher" />

</LinearLayout>

适配器

public class AMyAdapter extends RecyclerView.Adapter {

    private List<MyBean.ResultBean.DataBean> data;
    private Context mc;

    public AMyAdapter(List<MyBean.ResultBean.DataBean> data, Context mc) {
        this.data = data;
        this.mc = mc;
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        if (viewType == 1) {
            View inflate2 = LayoutInflater.from(mc).inflate(R.layout.item_b, null);
            return new Holder2(inflate2);
        }
        if (viewType == 3) {
            View inflate = LayoutInflater.from(mc).inflate(R.layout.item_a, null);
            return new Holder(inflate);

        }
        return null;
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        if (holder instanceof Holder) {
            Picasso.with(mc).load(data.get(position).getThumbnail_pic_s()).into(((Holder) holder).img1);
            Picasso.with(mc).load(data.get(position).getThumbnail_pic_s02()).into(((Holder) holder).img2);
            Picasso.with(mc).load(data.get(position).getThumbnail_pic_s03()).into(((Holder) holder).img3);
            ((Holder) holder).name.setText(data.get(position).getTitle());
        }
        if (holder instanceof Holder2) {
            Picasso.with(mc).load(data.get(position).getThumbnail_pic_s()).into(((Holder2) holder).img);
            ((Holder2) holder).name.setText(data.get(position).getTitle());
        }
    }

    @Override
    public int getItemViewType(int position) {
        if (data.get(position).getThumbnail_pic_s03() != null) {
            return 3;
        } else {
            return 1;
        }
    }

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

    public class Holder extends RecyclerView.ViewHolder {
        private ImageView img1, img2, img3;
        private TextView name;

        public Holder(View itemView) {
            super(itemView);
            name = itemView.findViewById(R.id.name);
            img1 = itemView.findViewById(R.id.img);
            img2 = itemView.findViewById(R.id.img2);
            img3 = itemView.findViewById(R.id.img3);
        }
    }

    public class Holder2 extends RecyclerView.ViewHolder {
        private ImageView img;
        private TextView name;

        public Holder2(View itemView) {
            super(itemView);
            img = itemView.findViewById(R.id.img3);
            name=itemView.findViewById(R.id.name);
        }
    }
}