Recylerview

导入依赖

 compile 'com.android.support:recyclerview-v7:26.0.0-alpha1'

第二步控件xml

<android.support.v7.widget.RecyclerView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/re"
        ></android.support.v7.widget.RecyclerView>

第三步 调用控件

        btn = findViewById(R.id.btn);

        recyclerView = findViewById(R.id.re);
        OkHttpClient okHttpClient = new OkHttpClient();
        Request build = new Request.Builder().url("http://120.27.23.105/product/getProducts?pscid=39&page=1").build();
        Call call = okHttpClient.newCall(build);
        call.enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {

            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                if (response.isSuccessful()) {
                    final String string = response.body().string();
                    if (string != null) {
                        runOnUiThread(new Runnable() {
                            @Override
                            public void run() {

                                flag = true;
                                Bean bean = new Gson().fromJson(string, Bean.class);
                                recyclerView.setLayoutManager(new LinearLayoutManager(MainActivity.this));
                                MyReAdapter adapter = new MyReAdapter(bean, MainActivity.this);
                                recyclerView.setAdapter(adapter);
                                btn.setOnClickListener(new View.OnClickListener() {
                                    @Override
                                    public void onClick(View view) {
                                        if (flag) {
                                            recyclerView.setLayoutManager(new GridLayoutManager(MainActivity.this, 2));
                                        } else {
                                            recyclerView.setLayoutManager(new LinearLayoutManager(MainActivity.this));

                                        }
                                        flag = !flag;
                                    }
                                });

                            }
                        });
                    }
                }
            }
        });

第四部 新建一个类 继承 RecyclerView.ViewHolder

public class MyHolder extends RecyclerView.ViewHolder {

    public final ImageView tu;
    public final TextView shang;
    public final TextView xia;

    public MyHolder(View itemView) {
        super(itemView);

        tu = itemView.findViewById(R.id.tu);
        shang = itemView.findViewById(R.id.shang);
        xia = itemView.findViewById(R.id.xia);
    }
}

第五步 新建一个适配器 继承 extends RecyclerView.Adapter

注意：有泛型extends RecyclerView.Adapter<MyHolder>
 Bean bean;
    Context context;

    public MyReAdapter(Bean bean, Context context) {
        this.bean = bean;
        this.context = context;
    }

    @Override
    public MyHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View inflate = View.inflate(context, R.layout.f1, null);
        MyHolder holder=new MyHolder(inflate);
        return holder;
    }

    @Override
    public void onBindViewHolder(MyHolder holder, int position) {

        String[] split = bean.getData().get(position).getImages().split("\\|");
        Glide.with(context).load(split[0]).into(holder.tu);
        holder.shang.setText(bean.getData().get(position).getTitle());

        holder.xia.setText(bean.getData().get(position).getPrice()+"");
    }

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

想加入横滑 就要在 之方法里面这样写

miaosha_recycler.setLayoutManager(new LinearLayoutManager(MainActivity.this, OrientationHelper.HORIZONTAL, false));

瀑布流

shouye_R_Jiugongge.setLayoutManager(new StaggeredGridLayoutManager(2,StaggeredGridLayoutManager.HORIZONTAL));