写一个简单的多布局

。。。这篇文章适合一些会recyclerView适配器但是不会多布局的萌新参考

1 每个布局写一个XML (名字起的不规范嘿嘿)

具体的XML内容我就不写了吧有萌新看不懂的话可以留言我再发

2 recyclerView的适配器继承什么的我就不写了吧

首先在适配器里写一个getItemType方法：

if判断设置type的返回值 position==0就是recyclerView的第一行显示的内容因为我这个布局是固定的所以这么判断你可以根据自己的情况来改

@Override
    public int getItemViewType(int position) {
        if (position == 0) {
            return 0;
        } else if (position == 1) {
            return 1;
        } else if (position == 2) {
            return 2;
        }
            return super.getItemViewType(position);

    }

然后在onCreateViewHolder方法里引入布局：

if判断i的值 i其实就是上边返回的type的值

然后分别导入布局这些布局全继承RecyclerView.ViewHolder 分别return viewHolder

@NonNull
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        if (i == 0) {
            View inflate = LayoutInflater.from(context).inflate(R.layout.layout_1, viewGroup, false);
            RecyclerView.ViewHolder viewHolder = new ViewHolder1(inflate);
            return viewHolder;
        } else if (i == 1) {
            View inflate = LayoutInflater.from(context).inflate(R.layout.layout_2, viewGroup, false);
            RecyclerView.ViewHolder viewHolder = new ViewHolder2(inflate);
            return viewHolder;
        } else if (i == 2) {
            View inflate = LayoutInflater.from(context).inflate(R.layout.layout_3, null, false);
            RecyclerView.ViewHolder viewHolder = new ViewHolder3(inflate);
            return viewHolder;
        }
        return null;
    }

public static class ViewHolder1 extends RecyclerView.ViewHolder {
        public View rootView;
        public Banner banner;

        public ViewHolder1(View rootView) {
            super(rootView);
            this.rootView = rootView;
            this.banner = (Banner) rootView.findViewById(R.id.banner);
        }

    }

    public static class ViewHolder2 extends RecyclerView.ViewHolder {
        public View rootView;
        public RecyclerView mRecyc2;

        public ViewHolder2(View rootView) {
            super(rootView);
            this.rootView = rootView;
            this.mRecyc2 = (RecyclerView) rootView.findViewById(R.id.mRecyc2);
        }

    }

    public static class ViewHolder3 extends RecyclerView.ViewHolder {
        public View rootView;
        public RecyclerView mRecyc3;

        public ViewHolder3(View rootView) {
            super(rootView);
            this.rootView = rootView;
            this.mRecyc3 = (RecyclerView) rootView.findViewById(R.id.mRecyc3);
        }

    }

最后在onBindViewHolder赋值：

if判断viewHodler是否继承与当前布局文件（emmm看名字很好懂的）

@Override
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder viewHolder, int i) {
        if (viewHolder instanceof ViewHolder1) {
            for (int j = 0; j <mList.size() ; j++) {
                images.add(mList.get(j).getThumbnail_pic_s());
            }
            ((ViewHolder1) viewHolder).banner.setImageLoader(new GlideImageLoader())
            .setImages(images)
            .start();
        }
        if (viewHolder instanceof ViewHolder2) {
            LinearLayoutManager manager = new LinearLayoutManager(context, LinearLayoutManager.HORIZONTAL, false);
            ((ViewHolder2) viewHolder).mRecyc2.setLayoutManager(manager);
            TwoAdapter adapter = new TwoAdapter(R.layout.layout_2a, mList);
            ((ViewHolder2) viewHolder).mRecyc2.setAdapter(adapter);
        }
        if (viewHolder instanceof ViewHolder3) {
            LinearLayoutManager manager = new LinearLayoutManager(context);
            ((ViewHolder3) viewHolder).mRecyc3.setLayoutManager(manager);
            ThreeAdapter adapter = new ThreeAdapter(R.layout.layout_3a, mList);
            ((ViewHolder3) viewHolder).mRecyc3.setAdapter(adapter);
        }
    }

再然后就没了使用适配器就行了希望大家能指点下给点建议谢谢

写一个简单的多布局

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