From https://medium.com/android-bites/grid-layout-with-header-3f2966181c4d

Android 给GridView加个头部

package ws.otero.adrian.gridexample;

import android.graphics.Color;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;


public class MainActivity extends ActionBarActivity {


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        TextView header = new TextView(this);
        header.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
        header.setTextColor(Color.parseColor("#000000"));
        header.setText("This is the header");

        RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
        recyclerView.setHasFixedSize(true);

        GridLayoutManager gridLayoutManager = new GridLayoutManager(this, 2);
        //If you treat it as a regular element, you’ll see that in fact it will behave as a regular element: 
        //if you have two columns, it will show up next to the first element and not on top
        //To solve this, you can change the span size of the header so it expands to fit as many columns as you have.
        gridLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
            @Override
            public int getSpanSize(int position) {
                return position == 0 ? 2 : 1;
            }
        });
        recyclerView.setLayoutManager(gridLayoutManager);

        ElementsAdapter elementsAdapter = new ElementsAdapter(5);
        elementsAdapter.setHeader(header);

        recyclerView.setAdapter(elementsAdapter);

    }

    public class ElementsAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

        private static final int VIEW_HEADER = 0;
        private static final int VIEW_NORMAL = 1;

        private View headerView;
        private int datasetSize;

        public class HeaderViewHolder extends RecyclerView.ViewHolder {
            public HeaderViewHolder(View v) {
                super(v);
            }
        }

        public class ViewHolder extends RecyclerView.ViewHolder {

            public TextView textView;

            public ViewHolder(TextView v) {
                super(v);
                textView = v;
            }
        }

        public ElementsAdapter(int size) {
            this.datasetSize = size;
        }

        public void setHeader(View v) {
            this.headerView = v;
        }

        @Override
        public int getItemViewType(int position) {
            return position == 0 ? VIEW_HEADER : VIEW_NORMAL;
        }

        @Override
        public int getItemCount() {
            return datasetSize + 1;
        }

        @Override
        public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            if (viewType == VIEW_HEADER) {
                return new HeaderViewHolder(headerView);

            } else {
                TextView textView = (TextView) LayoutInflater.from(parent.getContext()).inflate(R.layout.grid_element, parent, false);
                return new ViewHolder(textView);
            }
        }

        @Override
        public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int position) {

            if (position == 0) return;

            ViewHolder holder = (ViewHolder) viewHolder;
            holder.textView.setText("Position " + (position - 1));

        }
    }
}