如何实现让RecyclerView有不同尺寸的item

如何实现让RecyclerView有不同尺寸的item

package tv.lesports.com.myrecyclerview;

import android.app.Activity;
import android.os.Bundle;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.view.View;


import java.util.ArrayList;


public class RecyclerViewActivity extends Activity {
    private RecyclerView mRecyclerView;
    private HomeAdapter mAdapter;
    private ArrayList<SearchResultBean> mDataList;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.recyclerview_layout);
        initData();
        mRecyclerView = (RecyclerView) findViewById(R.id.id_recyclerview);
        GridLayoutManager manager = new GridLayoutManager(this, 4);
        manager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
            @Override
            public int getSpanSize(int position) {
               SearchResultBean bean = mDataList.get(position);
                if (bean.getType() == 0) {
                    return 4;
                } else if(bean.getType() == 1){
                    return 2;
                }else{
                    return 1;
                }
            }
        });
        mRecyclerView.setLayoutManager(manager);
        mRecyclerView.setItemAnimator(new DefaultItemAnimator());
        mAdapter = new HomeAdapter(this, mDataList);
        mRecyclerView.setAdapter(mAdapter);
    }

    protected void initData() {
        mDataList = new ArrayList<SearchResultBean>();
        for (int i = 0; i < 50; i++) {
            SearchResultBean bean = new SearchResultBean();
            bean.setName(i + "");
            if (i == 0) {
                bean.setType(0);
            } else if (i > 0 && i <= 5) {
                bean.setType(1);
            } else {
                bean.setType(2);
            }
            mDataList.add(bean);
        }
    }
}